1056 lines
42 KiB
Tcl
1056 lines
42 KiB
Tcl
set rcsid {$Id: capi3ref.tcl,v 1.5 2004/06/19 08:18:27 danielk1977 Exp $}
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source common.tcl
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header {C/C++ Interface For SQLite Version 3}
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puts {
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<h2>C/C++ Interface For SQLite Version 3</h2>
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}
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proc api {name prototype desc {notused x}} {
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global apilist
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if {$name==""} {
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regsub -all {sqlite3_[a-z0-9_]+\(} $prototype \
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{[lappend name [string trimright & (]]} x1
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subst $x1
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}
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lappend apilist [list $name $prototype $desc]
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}
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api {result-codes} {
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#define SQLITE_OK 0 /* Successful result */
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#define SQLITE_ERROR 1 /* SQL error or missing database */
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#define SQLITE_INTERNAL 2 /* An internal logic error in SQLite */
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#define SQLITE_PERM 3 /* Access permission denied */
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#define SQLITE_ABORT 4 /* Callback routine requested an abort */
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#define SQLITE_BUSY 5 /* The database file is locked */
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#define SQLITE_LOCKED 6 /* A table in the database is locked */
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#define SQLITE_NOMEM 7 /* A malloc() failed */
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#define SQLITE_READONLY 8 /* Attempt to write a readonly database */
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#define SQLITE_INTERRUPT 9 /* Operation terminated by sqlite_interrupt() */
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#define SQLITE_IOERR 10 /* Some kind of disk I/O error occurred */
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#define SQLITE_CORRUPT 11 /* The database disk image is malformed */
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#define SQLITE_NOTFOUND 12 /* (Internal Only) Table or record not found */
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#define SQLITE_FULL 13 /* Insertion failed because database is full */
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#define SQLITE_CANTOPEN 14 /* Unable to open the database file */
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#define SQLITE_PROTOCOL 15 /* Database lock protocol error */
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#define SQLITE_EMPTY 16 /* (Internal Only) Database table is empty */
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#define SQLITE_SCHEMA 17 /* The database schema changed */
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#define SQLITE_TOOBIG 18 /* Too much data for one row of a table */
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#define SQLITE_CONSTRAINT 19 /* Abort due to contraint violation */
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#define SQLITE_MISMATCH 20 /* Data type mismatch */
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#define SQLITE_MISUSE 21 /* Library used incorrectly */
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#define SQLITE_NOLFS 22 /* Uses OS features not supported on host */
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#define SQLITE_AUTH 23 /* Authorization denied */
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#define SQLITE_ROW 100 /* sqlite_step() has another row ready */
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#define SQLITE_DONE 101 /* sqlite_step() has finished executing */
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} {
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Many SQLite functions return an integer result code from the set shown
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above in order to indicates success or failure.
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}
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api {} {
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void *sqlite3_aggregate_context(sqlite3_context*, int nBytes);
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} {
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Aggregate functions use the following routine to allocate
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a structure for storing their state. The first time this routine
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is called for a particular aggregate, a new structure of size nBytes
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is allocated, zeroed, and returned. On subsequent calls (for the
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same aggregate instance) the same buffer is returned. The implementation
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of the aggregate can use the returned buffer to accumulate data.
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The buffer allocated is freed automatically by SQLite.
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}
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api {} {
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int sqlite3_aggregate_count(sqlite3_context*);
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} {
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The next routine returns the number of calls to xStep for a particular
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aggregate function instance. The current call to xStep counts so this
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routine always returns at least 1.
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}
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api {} {
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int sqlite3_bind_blob(sqlite3_stmt*, int, const void*, int n, void(*)(void*));
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int sqlite3_bind_double(sqlite3_stmt*, int, double);
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int sqlite3_bind_int(sqlite3_stmt*, int, int);
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int sqlite3_bind_int64(sqlite3_stmt*, int, long long int);
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int sqlite3_bind_null(sqlite3_stmt*, int);
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int sqlite3_bind_text(sqlite3_stmt*, int, const char*, int n, void(*)(void*));
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int sqlite3_bind_text16(sqlite3_stmt*, int, const void*, int n, void(*)(void*));
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#define SQLITE_STATIC ((void(*)(void *))0)
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#define SQLITE_TRANSIENT ((void(*)(void *))-1)
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} {
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In the SQL strings input to sqlite3_prepare() and sqlite3_prepare16(),
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one or more literals can be replace by a wildcard "?" or ":N:" where
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N is an integer. The value of these wildcard literals can be set
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using these routines.
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The first parameter is a pointer to the sqlite3_stmt
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structure returned from sqlite3_prepare(). The second parameter is the
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index of the wildcard. The first "?" has an index of 1. ":N:" wildcards
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use the index N.
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The fifth parameter to sqlite3_bind_blob(), sqlite3_bind_text(), and
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sqlite3_bind_text16() is a destructor used to dispose of the BLOB or
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text after SQLite has finished with it. If the fifth argument is the
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special value SQLITE_STATIC, then the library assumes that the information
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is in static, unmanaged space and does not need to be freed. If the
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fifth argument has the value SQLITE_TRANSIENT, then SQLite makes its
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own private copy of the data.
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The sqlite3_bind_*() routine must be called after
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sqlite3_prepare() or sqlite3_reset() and before sqlite3_step().
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Bindings are not reset by the sqlite3_reset() routine.
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Unbound wildcards are interpreted as NULL.
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}
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api {} {
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int sqlite3_busy_handler(sqlite*, int(*)(void*,int), void*);
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} {
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This routine identifies a callback function that is invoked
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whenever an attempt is made to open a database table that is
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currently locked by another process or thread. If the busy callback
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is NULL, then sqlite3_exec() returns SQLITE_BUSY immediately if
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it finds a locked table. If the busy callback is not NULL, then
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sqlite3_exec() invokes the callback with two arguments. The
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second argument is the number of prior calls to the busy callback
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for the same lock. If the
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busy callback returns 0, then sqlite3_exec() immediately returns
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SQLITE_BUSY. If the callback returns non-zero, then sqlite3_exec()
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tries to open the table again and the cycle repeats.
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The default busy callback is NULL.
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Sqlite is re-entrant, so the busy handler may start a new query.
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(It is not clear why anyone would every want to do this, but it
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is allowed, in theory.) But the busy handler may not close the
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database. Closing the database from a busy handler will delete
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data structures out from under the executing query and will
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probably result in a coredump.
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}
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api {} {
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int sqlite3_busy_timeout(sqlite*, int ms);
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} {
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This routine sets a busy handler that sleeps for a while when a
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table is locked. The handler will sleep multiple times until
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at least "ms" milleseconds of sleeping have been done. After
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"ms" milleseconds of sleeping, the handler returns 0 which
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causes sqlite3_exec() to return SQLITE_BUSY.
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Calling this routine with an argument less than or equal to zero
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turns off all busy handlers.
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}
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api {} {
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int sqlite3_changes(sqlite*);
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} {
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This function returns the number of database rows that were changed
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(or inserted or deleted) by the most recently completed
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INSERT, UPDATE, or DELETE
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statement. Only changes that are directly specified by the INSERT,
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UPDATE, or DELETE statement are counted. Auxiliary changes caused by
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triggers are not counted. Use the sqlite3_total_changes() function
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to find the total number of changes including changes caused by triggers.
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Within the body of a trigger, the sqlite3_changes() function does work
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to report the number of rows that were changed for the most recently
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completed INSERT, UPDATE, or DELETE statement within the trigger body.
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SQLite implements the command "DELETE FROM table" without a WHERE clause
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by dropping and recreating the table. (This is much faster than going
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through and deleting individual elements form the table.) Because of
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this optimization, the change count for "DELETE FROM table" will be
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zero regardless of the number of elements that were originally in the
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table. To get an accurate count of the number of rows deleted, use
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"DELETE FROM table WHERE 1" instead.
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}
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api {} {
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int sqlite3_total_changes(sqlite*);
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} {
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This function returns the total number of database rows that have
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be modified, inserted, or deleted since the database connection was
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created using sqlite3_open(). All changes are counted, including
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changes by triggers and changes to TEMP and auxiliary databases.
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Except, changes to the SQLITE_MASTER table (caused by statements
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such as CREATE TABLE) are not counted. Nor are changes counted when
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an entire table is deleted using DROP TABLE.
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See also the sqlite3_changes() API.
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SQLite implements the command "DELETE FROM table" without a WHERE clause
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by dropping and recreating the table. (This is much faster than going
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through and deleting individual elements form the table.) Because of
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this optimization, the change count for "DELETE FROM table" will be
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zero regardless of the number of elements that were originally in the
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table. To get an accurate count of the number of rows deleted, use
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"DELETE FROM table WHERE 1" instead.
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}
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api {} {
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int sqlite3_close(sqlite *);
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} {
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Call this function with a pointer to a structure that was previously
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returned from sqlite3_open() or sqlite3_open16()
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and the corresponding database will by closed.
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SQLITE_OK is returned if the close is successful. If there are
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prepared statements that have not been finalized, then SQLITE_BUSY
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is returned. SQLITE_ERROR might be returned if the argument is not
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a valid connection pointer returned by sqlite3_open() or if the connection
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pointer has been closed previously.
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}
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api {} {
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const void *sqlite3_column_blob(sqlite3_stmt*, int iCol);
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int sqlite3_column_bytes(sqlite3_stmt*, int iCol);
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int sqlite3_column_bytes16(sqlite3_stmt*, int iCol);
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double sqlite3_column_double(sqlite3_stmt*, int iCol);
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int sqlite3_column_int(sqlite3_stmt*, int iCol);
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long long int sqlite3_column_int64(sqlite3_stmt*, int iCol);
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const unsigned char *sqlite3_column_text(sqlite3_stmt*, int iCol);
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const void *sqlite3_column_text16(sqlite3_stmt*, int iCol);
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int sqlite3_column_type(sqlite3_stmt*, int iCol);
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#define SQLITE_INTEGER 1
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#define SQLITE_FLOAT 2
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#define SQLITE_TEXT 3
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#define SQLITE_BLOB 4
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#define SQLITE_NULL 5
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} {
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These routines returns information about the information
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in a single column of the current result row of a query. In every
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case the first parameter is a pointer to the SQL statement that is being
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executed (the sqlite_stmt* that was returned from sqlite3_prepare()) and
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the second argument is the index of the column for which information
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should be returned. iCol is zero-indexed. The left-most column as an
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index of 0.
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If the SQL statement is not currently point to a valid row, or if the
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the colulmn index is out of range, the result is undefined.
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These routines attempt to convert the value where appropriate. For
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example, if the internal representation is FLOAT and a text result
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is requested, sprintf() is used internally to do the conversion
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automatically. The following table details the conversions that
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are applied:
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<table broder=1>
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<tr><th>Internal Type</th><th>Requested Type</th><th>Conversion</th></tr>
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<tr><td> NULL </td><td> INTEGER</td><td>Result is 0</td></tr>
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<tr><td> NULL </td><td> FLOAT </td><td> Result is 0.0</td></tr>
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<tr><td> NULL </td><td> TEXT </td><td> Result is an empty string</td></tr>
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<tr><td> NULL </td><td> BLOB </td><td> Result is a zero-length BLOB</td></tr>
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<tr><td> INTEGER </td><td> FLOAT </td><td> Convert from integer to float</td></tr>
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<tr><td> INTEGER </td><td> TEXT </td><td> ASCII rendering of the integer</td></tr>
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<tr><td> INTEGER </td><td> BLOB </td><td> Same as for INTEGER->TEXT</td></tr>
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<tr><td> FLOAT </td><td> INTEGER</td><td>Convert from float to integer</td></tr>
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<tr><td> FLOAT </td><td> TEXT </td><td> ASCII rendering of the float</td></tr>
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<tr><td> FLOAT </td><td> BLOB </td><td> Same as FLOAT->TEXT</td></tr>
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<tr><td> TEXT </td><td> INTEGER</td><td>Use atoi()</td></tr>
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<tr><td> TEXT </td><td> FLOAT </td><td> Use atof()</td></tr>
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<tr><td> TEXT </td><td> BLOB </td><td> No change</td></tr>
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<tr><td> BLOB </td><td> INTEGER</td><td>Convert to TEXT then use atoi()</td></tr>
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<tr><td> BLOB </td><td> FLOAT </td><td> Convert to TEXT then use atof()</td></tr>
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<tr><td> BLOB </td><td> TEXT </td><td> Add a \000 terminator if needed</td></tr>
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</table>
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}
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api {} {
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int sqlite3_column_count(sqlite3_stmt *pStmt);
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} {
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Return the number of columns in the result set returned by the prepared
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SQL statement. This routine returns 0 if pStmt is an SQL statement
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that does not return data (for example an UPDATE).
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See also sqlite3_data_count().
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}
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api {} {
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const char *sqlite3_column_decltype(sqlite3_stmt *, int i);
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const void *sqlite3_column_decltype16(sqlite3_stmt*,int);
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} {
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The first parameter is a prepared SQL statement. If this statement
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is a SELECT statement, the Nth column of the returned result set
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of the SELECT is a table column then the declared type of the table
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column is returned. If the Nth column of the result set is not at table
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column, then a NULL pointer is returned. The returned string is
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UTF-8 encoded for sqlite3_column_decltype() and UTF-16 encoded
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for sqlite3_column_decltype16().
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For example, in the database schema:
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<blockquote><pre>
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CREATE TABLE t1(c1 INTEGER);
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</pre></blockquote>
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And the following statement compiled:
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<blockquote><pre>
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SELECT c1 + 1, 0 FROM t1;
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</pre></blockquote>
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Then this routine would return the string "INTEGER" for the second
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result column (i==1), and a NULL pointer for the first result column
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|
(i==0).
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}
|
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api {} {
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const char *sqlite3_column_name(sqlite3_stmt*,int);
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const void *sqlite3_column_name16(sqlite3_stmt*,int);
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} {
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|
The first parameter is a prepared SQL statement. This function returns
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the column heading for the Nth column of that statement, where N is the
|
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second function parameter. The string returned is UTF-8 for
|
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sqlite3_column_name() and UTF-16 for sqlite3_column_name16().
|
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}
|
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api {} {
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void *sqlite3_commit_hook(sqlite*, int(*xCallback)(void*), void *pArg);
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|
} {
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|
<i>Experimental</i>
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Register a callback function to be invoked whenever a new transaction
|
|
is committed. The pArg argument is passed through to the callback.
|
|
callback. If the callback function returns non-zero, then the commit
|
|
is converted into a rollback.
|
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|
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If another function was previously registered, its pArg value is returned.
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Otherwise NULL is returned.
|
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Registering a NULL function disables the callback. Only a single commit
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hook callback can be registered at a time.
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}
|
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api {} {
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int sqlite3_complete(const char *sql);
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|
int sqlite3_complete16(const void *sql);
|
|
} {
|
|
These functions return true if the given input string comprises
|
|
one or more complete SQL statements.
|
|
The parameter must be a nul-terminated UTF-8 string for sqlite3_complete()
|
|
and a nul-terminated UTF-16 string for sqlite3_complete16().
|
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The algorithm is simple. If the last token other than spaces
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and comments is a semicolon, then return true. otherwise return
|
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false.
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} {}
|
|
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api {} {
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int sqlite3_create_collation(
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sqlite3*,
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const char *zName,
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int pref16,
|
|
void*,
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|
int(*xCompare)(void*,int,const void*,int,const void*)
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);
|
|
int sqlite3_create_collation16(
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|
sqlite3*,
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const char *zName,
|
|
int pref16,
|
|
void*,
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|
int(*xCompare)(void*,int,const void*,int,const void*)
|
|
);
|
|
#define SQLITE_UTF8 1
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|
#define SQLITE_UTF16BE 2
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|
#define SQLITE_UTF16LE 3
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|
#define SQLITE_UTF16 4
|
|
} {
|
|
These two functions are used to add new collation sequences to the
|
|
sqlite3 handle specified as the first argument.
|
|
|
|
The name of the new collation sequence is specified as a UTF-8 string
|
|
for sqlite3_create_collation() and a UTF-16 string for
|
|
sqlite3_create_collation16(). In both cases the name is passed as the
|
|
second function argument.
|
|
|
|
The third argument must be one of the constants SQLITE_UTF8,
|
|
SQLITE_UTF16LE or SQLITE_UTF16BE, indicating that the user-supplied
|
|
routine expects to be passed pointers to strings encoded using UTF-8,
|
|
UTF-16 little-endian or UTF-16 big-endian respectively. The
|
|
SQLITE_UTF16 constant indicates that text strings are expected in
|
|
UTF-16 in the native byte order of the host machine.
|
|
|
|
A pointer to the user supplied routine must be passed as the fifth
|
|
argument. If it is NULL, this is the same as deleting the collation
|
|
sequence (so that SQLite cannot call it anymore). Each time the user
|
|
supplied function is invoked, it is passed a copy of the void* passed as
|
|
the fourth argument to sqlite3_create_collation() or
|
|
sqlite3_create_collation16() as its first parameter.
|
|
|
|
The remaining arguments to the user-supplied routine are two strings,
|
|
each represented by a [length, data] pair and encoded in the encoding
|
|
that was passed as the third argument when the collation sequence was
|
|
registered. The user routine should return negative, zero or positive if
|
|
the first string is less than, equal to, or greater than the second
|
|
string. i.e. (STRING1 - STRING2).
|
|
}
|
|
|
|
api {} {
|
|
int sqlite3_collation_needed(
|
|
sqlite3*,
|
|
void*,
|
|
void(*)(void*,sqlite3*,int eTextRep,const char*)
|
|
);
|
|
int sqlite3_collation_needed16(
|
|
sqlite3*,
|
|
void*,
|
|
void(*)(void*,sqlite3*,int eTextRep,const void*)
|
|
);
|
|
} {
|
|
To avoid having to register all collation sequences before a database
|
|
can be used, a single callback function may be registered with the
|
|
database handle to be called whenever an undefined collation sequence is
|
|
required.
|
|
|
|
If the function is registered using the sqlite3_collation_needed() API,
|
|
then it is passed the names of undefined collation sequences as strings
|
|
encoded in UTF-8. If sqlite3_collation_needed16() is used, the names
|
|
are passed as UTF-16 in machine native byte order. A call to either
|
|
function replaces any existing callback.
|
|
|
|
When the user-function is invoked, the first argument passed is a copy
|
|
of the second argument to sqlite3_collation_needed() or
|
|
sqlite3_collation_needed16(). The second argument is the database
|
|
handle. The third argument is one of SQLITE_UTF8, SQLITE_UTF16BE or
|
|
SQLITE_UTF16LE, indicating the most desirable form of the collation
|
|
sequence function required. The fourth parameter is the name of the
|
|
required collation sequence.
|
|
|
|
The collation sequence is returned to SQLite by a collation-needed
|
|
callback using the sqlite3_create_collation() or
|
|
sqlite3_create_collation16() APIs, described above.
|
|
}
|
|
|
|
api {} {
|
|
int sqlite3_create_function(
|
|
sqlite3 *,
|
|
const char *zFunctionName,
|
|
int nArg,
|
|
int eTextRep,
|
|
void*,
|
|
void (*xFunc)(sqlite3_context*,int,sqlite3_value**),
|
|
void (*xStep)(sqlite3_context*,int,sqlite3_value**),
|
|
void (*xFinal)(sqlite3_context*)
|
|
);
|
|
int sqlite3_create_function16(
|
|
sqlite3*,
|
|
const void *zFunctionName,
|
|
int nArg,
|
|
int eTextRep,
|
|
void*,
|
|
void (*xFunc)(sqlite3_context*,int,sqlite3_value**),
|
|
void (*xStep)(sqlite3_context*,int,sqlite3_value**),
|
|
void (*xFinal)(sqlite3_context*)
|
|
);
|
|
#define SQLITE_UTF8 1
|
|
#define SQLITE_UTF16 2
|
|
#define SQLITE_UTF16BE 3
|
|
#define SQLITE_UTF16LE 4
|
|
#define SQLITE_ANY 5
|
|
} {
|
|
These two functions are used to add user functions or aggregates
|
|
implemented in C to the SQL langauge interpreted by SQLite. The
|
|
difference only between the two is that the second parameter, the
|
|
name of the (scalar) function or aggregate, is encoded in UTF-8 for
|
|
sqlite3_create_function() and UTF-16 for sqlite3_create_function16().
|
|
|
|
The first argument is the database handle that the new function or
|
|
aggregate is to be added to. If a single program uses more than one
|
|
database handle internally, then user functions or aggregates must
|
|
be added individually to each database handle with which they will be
|
|
used.
|
|
|
|
The third parameter is the number of arguments that the function or
|
|
aggregate takes. If this parameter is negative, then the function or
|
|
aggregate may take any number of arguments.
|
|
|
|
The sixth, seventh and eighth, xFunc, xStep and xFinal, are
|
|
pointers to user implemented C functions that implement the user
|
|
function or aggregate. A scalar function requires an implementation of
|
|
the xFunc callback only, NULL pointers should be passed as the xStep
|
|
and xFinal parameters. An aggregate function requires an implementation
|
|
of xStep and xFinal, but NULL should be passed for xFunc. To delete an
|
|
existing user function or aggregate, pass NULL for all three function
|
|
callback. Specifying an inconstent set of callback values, such as an
|
|
xFunc and an xFinal, or an xStep but no xFinal, SQLITE_ERROR is
|
|
returned.
|
|
}
|
|
|
|
api {} {
|
|
int sqlite3_data_count(sqlite3_stmt *pStmt);
|
|
} {
|
|
Return the number of values in the current row of the result set.
|
|
|
|
After a call to sqlite3_step() that returns SQLITE_ROW, this routine
|
|
will return the same value as the sqlite3_column_count() function.
|
|
After sqlite3_step() has returned an SQLITE_DONE, SQLITE_BUSY or
|
|
error code, or before sqlite3_step() has been called on a
|
|
prepared SQL statement, this routine returns zero.
|
|
}
|
|
|
|
api {} {
|
|
int sqlite3_errcode(sqlite3 *db);
|
|
} {
|
|
Return the error code for the most recent sqlite3_* API call associated
|
|
with sqlite3 handle 'db'. SQLITE_OK is returned if the most recent
|
|
API call was successful.
|
|
|
|
Calls to many sqlite3_* functions set the error code and string returned
|
|
by sqlite3_errcode(), sqlite3_errmsg() and sqlite3_errmsg16()
|
|
(overwriting the previous values). Note that calls to sqlite3_errcode(),
|
|
sqlite3_errmsg() and sqlite3_errmsg16() themselves do not affect the
|
|
results of future invocations.
|
|
|
|
Assuming no other intervening sqlite3_* API calls are made, the error
|
|
code returned by this function is associated with the same error as
|
|
the strings returned by sqlite3_errmsg() and sqlite3_errmsg16().
|
|
} {}
|
|
|
|
api {} {
|
|
const char *sqlite3_errmsg(sqlite3*);
|
|
const void *sqlite3_errmsg16(sqlite3*);
|
|
} {
|
|
Return a pointer to a UTF-8 encoded string (sqlite3_errmsg)
|
|
or a UTF-16 encoded string (sqlite3_errmsg16) describing in English the
|
|
error condition for the most recent sqlite3_* API call. The returned
|
|
string is always terminated by an 0x00 byte.
|
|
|
|
The string "not an error" is returned when the most recent API call was
|
|
successful.
|
|
}
|
|
|
|
api {} {
|
|
int sqlite3_exec(
|
|
sqlite*, /* An open database */
|
|
const char *sql, /* SQL to be executed */
|
|
sqlite_callback, /* Callback function */
|
|
void *, /* 1st argument to callback function */
|
|
char **errmsg /* Error msg written here */
|
|
);
|
|
} {
|
|
A function to executes one or more statements of SQL.
|
|
|
|
If one or more of the SQL statements are queries, then
|
|
the callback function specified by the 3rd parameter is
|
|
invoked once for each row of the query result. This callback
|
|
should normally return 0. If the callback returns a non-zero
|
|
value then the query is aborted, all subsequent SQL statements
|
|
are skipped and the sqlite3_exec() function returns the SQLITE_ABORT.
|
|
|
|
The 4th parameter is an arbitrary pointer that is passed
|
|
to the callback function as its first parameter.
|
|
|
|
The 2nd parameter to the callback function is the number of
|
|
columns in the query result. The 3rd parameter to the callback
|
|
is an array of strings holding the values for each column.
|
|
The 4th parameter to the callback is an array of strings holding
|
|
the names of each column.
|
|
|
|
The callback function may be NULL, even for queries. A NULL
|
|
callback is not an error. It just means that no callback
|
|
will be invoked.
|
|
|
|
If an error occurs while parsing or evaluating the SQL (but
|
|
not while executing the callback) then an appropriate error
|
|
message is written into memory obtained from malloc() and
|
|
*errmsg is made to point to that message. The calling function
|
|
is responsible for freeing the memory that holds the error
|
|
message. Use sqlite3_free() for this. If errmsg==NULL,
|
|
then no error message is ever written.
|
|
|
|
The return value is is SQLITE_OK if there are no errors and
|
|
some other return code if there is an error. The particular
|
|
return value depends on the type of error.
|
|
|
|
If the query could not be executed because a database file is
|
|
locked or busy, then this function returns SQLITE_BUSY. (This
|
|
behavior can be modified somewhat using the sqlite3_busy_handler()
|
|
and sqlite3_busy_timeout() functions.)
|
|
} {}
|
|
|
|
api {} {
|
|
int sqlite3_finalize(sqlite3_stmt *pStmt);
|
|
} {
|
|
The sqlite3_finalize() function is called to delete a prepared
|
|
SQL statement obtained by a previous call to sqlite3_prepare()
|
|
or sqlite3_prepare16(). If the statement was executed successfully, or
|
|
not executed at all, then SQLITE_OK is returned. If execution of the
|
|
statement failed then an error code is returned.
|
|
|
|
All prepared statements must finalized before sqlite3_close() is
|
|
called or else the close will fail with a return code of SQLITE_BUSY.
|
|
|
|
This routine can be called at any point during the execution of the
|
|
virtual machine. If the virtual machine has not completed execution
|
|
when this routine is called, that is like encountering an error or
|
|
an interrupt. (See sqlite3_interrupt().) Incomplete updates may be
|
|
rolled back and transactions cancelled, depending on the circumstances,
|
|
and the result code returned will be SQLITE_ABORT.
|
|
}
|
|
|
|
api {} {
|
|
void sqlite3_free(char *z);
|
|
} {
|
|
Use this routine to free memory obtained from
|
|
sqlite3_mprintf() or sqlite3_vmprintf().
|
|
}
|
|
|
|
api {} {
|
|
int sqlite3_get_table(
|
|
sqlite*, /* An open database */
|
|
const char *sql, /* SQL to be executed */
|
|
char ***resultp, /* Result written to a char *[] that this points to */
|
|
int *nrow, /* Number of result rows written here */
|
|
int *ncolumn, /* Number of result columns written here */
|
|
char **errmsg /* Error msg written here */
|
|
);
|
|
void sqlite3_free_table(char **result);
|
|
} {
|
|
This next routine is really just a wrapper around sqlite3_exec().
|
|
Instead of invoking a user-supplied callback for each row of the
|
|
result, this routine remembers each row of the result in memory
|
|
obtained from malloc(), then returns all of the result after the
|
|
query has finished.
|
|
|
|
As an example, suppose the query result where this table:
|
|
|
|
<pre>
|
|
Name | Age
|
|
-----------------------
|
|
Alice | 43
|
|
Bob | 28
|
|
Cindy | 21
|
|
</pre>
|
|
|
|
If the 3rd argument were &azResult then after the function returns
|
|
azResult will contain the following data:
|
|
|
|
<pre>
|
|
azResult[0] = "Name";
|
|
azResult[1] = "Age";
|
|
azResult[2] = "Alice";
|
|
azResult[3] = "43";
|
|
azResult[4] = "Bob";
|
|
azResult[5] = "28";
|
|
azResult[6] = "Cindy";
|
|
azResult[7] = "21";
|
|
</pre>
|
|
|
|
Notice that there is an extra row of data containing the column
|
|
headers. But the *nrow return value is still 3. *ncolumn is
|
|
set to 2. In general, the number of values inserted into azResult
|
|
will be ((*nrow) + 1)*(*ncolumn).
|
|
|
|
After the calling function has finished using the result, it should
|
|
pass the result data pointer to sqlite3_free_table() in order to
|
|
release the memory that was malloc-ed. Because of the way the
|
|
malloc() happens, the calling function must not try to call
|
|
malloc() directly. Only sqlite3_free_table() is able to release
|
|
the memory properly and safely.
|
|
|
|
The return value of this routine is the same as from sqlite3_exec().
|
|
}
|
|
|
|
api {sqlite3_interrupt} {
|
|
void sqlite3_interrupt(sqlite*);
|
|
} {
|
|
This function causes any pending database operation to abort and
|
|
return at its earliest opportunity. This routine is typically
|
|
called in response to a user action such as pressing "Cancel"
|
|
or Ctrl-C where the user wants a long query operation to halt
|
|
immediately.
|
|
} {}
|
|
|
|
api {} {
|
|
long long int sqlite3_last_insert_rowid(sqlite*);
|
|
} {
|
|
Each entry in an SQLite table has a unique integer key. (The key is
|
|
the value of the INTEGER PRIMARY KEY column if there is such a column,
|
|
otherwise the key is generated at random. The unique key is always
|
|
available as the ROWID, OID, or _ROWID_ column.) The following routine
|
|
returns the integer key of the most recent insert in the database.
|
|
|
|
This function is similar to the mysql_insert_id() function from MySQL.
|
|
} {}
|
|
|
|
api {} {
|
|
char *sqlite3_mprintf(const char*,...);
|
|
char *sqlite3_vmprintf(const char*, va_list);
|
|
} {
|
|
These routines are variants of the "sprintf()" from the
|
|
standard C library. The resulting string is written into memory
|
|
obtained from malloc() so that there is never a possiblity of buffer
|
|
overflow. These routines also implement some additional formatting
|
|
options that are useful for constructing SQL statements.
|
|
|
|
The strings returned by these routines should be freed by calling
|
|
sqlite3_free().
|
|
|
|
All of the usual printf formatting options apply. In addition, there
|
|
is a "%q" option. %q works like %s in that it substitutes a null-terminated
|
|
string from the argument list. But %q also doubles every '\'' character.
|
|
%q is designed for use inside a string literal. By doubling each '\''
|
|
character it escapes that character and allows it to be inserted into
|
|
the string.
|
|
|
|
For example, so some string variable contains text as follows:
|
|
|
|
<blockquote><pre>
|
|
char *zText = "It's a happy day!";
|
|
</pre></blockquote>
|
|
|
|
One can use this text in an SQL statement as follows:
|
|
|
|
<blockquote><pre>
|
|
sqlite3_exec_printf(db, "INSERT INTO table VALUES('%q')",
|
|
callback1, 0, 0, zText);
|
|
</pre></blockquote>
|
|
|
|
Because the %q format string is used, the '\'' character in zText
|
|
is escaped and the SQL generated is as follows:
|
|
|
|
<blockquote><pre>
|
|
INSERT INTO table1 VALUES('It''s a happy day!')
|
|
</pre></blockquote>
|
|
|
|
This is correct. Had we used %s instead of %q, the generated SQL
|
|
would have looked like this:
|
|
|
|
<blockquote><pre>
|
|
INSERT INTO table1 VALUES('It's a happy day!');
|
|
</pre></blockquote>
|
|
|
|
This second example is an SQL syntax error. As a general rule you
|
|
should always use %q instead of %s when inserting text into a string
|
|
literal.
|
|
} {}
|
|
|
|
api {} {
|
|
int sqlite3_open(
|
|
const char *filename, /* Database filename (UTF-8) */
|
|
sqlite3 **ppDb /* OUT: SQLite db handle */
|
|
);
|
|
int sqlite3_open16(
|
|
const void *filename, /* Database filename (UTF-16) */
|
|
sqlite3 **ppDb /* OUT: SQLite db handle */
|
|
);
|
|
} {
|
|
Open the sqlite database file "filename". The "filename" is UTF-8
|
|
encoded for sqlite3_open() and UTF-16 encoded in the native byte order
|
|
for sqlite3_open16(). An sqlite3* handle is returned in *ppDb, even
|
|
if an error occurs. If the database is opened (or created) successfully,
|
|
then SQLITE_OK is returned. Otherwise an error code is returned. The
|
|
sqlite3_errmsg() or sqlite3_errmsg16() routines can be used to obtain
|
|
an English language description of the error.
|
|
|
|
If the database file does not exist, then a new database will be created
|
|
as needed.
|
|
The encoding for the database will be UTF-8 if sqlite3_open() is called and
|
|
UTF-16 if sqlite3_open16 is used.
|
|
|
|
Whether or not an error occurs when it is opened, resources associated
|
|
with the sqlite3* handle should be released by passing it to
|
|
sqlite3_close() when it is no longer required.
|
|
}
|
|
|
|
api {} {
|
|
int sqlite3_prepare(
|
|
sqlite3 *db, /* Database handle */
|
|
const char *zSql, /* SQL statement, UTF-8 encoded */
|
|
int nBytes, /* Length of zSql in bytes. */
|
|
sqlite3_stmt **ppStmt, /* OUT: Statement handle */
|
|
const char **pzTail /* OUT: Pointer to unused portion of zSql */
|
|
);
|
|
int sqlite3_prepare16(
|
|
sqlite3 *db, /* Database handle */
|
|
const void *zSql, /* SQL statement, UTF-16 encoded */
|
|
int nBytes, /* Length of zSql in bytes. */
|
|
sqlite3_stmt **ppStmt, /* OUT: Statement handle */
|
|
const void **pzTail /* OUT: Pointer to unused portion of zSql */
|
|
);
|
|
} {
|
|
To execute an SQL query, it must first be compiled into a byte-code
|
|
program using one of the following routines. The only difference between
|
|
them is that the second argument, specifying the SQL statement to
|
|
compile, is assumed to be encoded in UTF-8 for the sqlite3_prepare()
|
|
function and UTF-16 for sqlite3_prepare16().
|
|
|
|
The first parameter "db" is an SQLite database handle. The second
|
|
parameter "zSql" is the statement to be compiled, encoded as either
|
|
UTF-8 or UTF-16 (see above). If the next parameter, "nBytes", is less
|
|
than zero, then zSql is read up to the first nul terminator. If
|
|
"nBytes" is not less than zero, then it is the length of the string zSql
|
|
in bytes (not characters).
|
|
|
|
*pzTail is made to point to the first byte past the end of the first
|
|
SQL statement in zSql. This routine only compiles the first statement
|
|
in zSql, so *pzTail is left pointing to what remains uncompiled.
|
|
|
|
*ppStmt is left pointing to a compiled SQL statement that can be
|
|
executed using sqlite3_step(). Or if there is an error, *ppStmt may be
|
|
set to NULL. If the input text contained no SQL (if the input is and
|
|
empty string or a comment) then *ppStmt is set to NULL.
|
|
|
|
On success, SQLITE_OK is returned. Otherwise an error code is returned.
|
|
}
|
|
|
|
api {} {
|
|
void sqlite3_progress_handler(sqlite*, int, int(*)(void*), void*);
|
|
} {
|
|
<i>Experimental</i>
|
|
|
|
This routine configures a callback function - the progress callback - that
|
|
is invoked periodically during long running calls to sqlite3_exec(),
|
|
sqlite3_step() and sqlite3_get_table().
|
|
An example use for this API is to keep
|
|
a GUI updated during a large query.
|
|
|
|
The progress callback is invoked once for every N virtual machine opcodes,
|
|
where N is the second argument to this function. The progress callback
|
|
itself is identified by the third argument to this function. The fourth
|
|
argument to this function is a void pointer passed to the progress callback
|
|
function each time it is invoked.
|
|
|
|
If a call to sqlite3_exec(), sqlite3_step() or sqlite3_get_table() results
|
|
in less than N opcodes being executed, then the progress callback is not
|
|
invoked.
|
|
|
|
To remove the progress callback altogether, pass NULL as the third
|
|
argument to this function.
|
|
|
|
If the progress callback returns a result other than 0, then the current
|
|
query is immediately terminated and any database changes rolled back. If the
|
|
query was part of a larger transaction, then the transaction is not rolled
|
|
back and remains active. The sqlite3_exec() call returns SQLITE_ABORT.
|
|
|
|
}
|
|
|
|
api {} {
|
|
int sqlite3_reset(sqlite3_stmt *pStmt);
|
|
} {
|
|
The sqlite3_reset() function is called to reset a prepared SQL
|
|
statement obtained by a previous call to sqlite3_prepare() or
|
|
sqlite3_prepare16() back to it's initial state, ready to be re-executed.
|
|
Any SQL statement variables that had values bound to them using
|
|
the sqlite3_bind_*() API retain their values.
|
|
}
|
|
|
|
api {} {
|
|
void sqlite3_result_blob(sqlite3_context*, const void*, int n, void(*)(void*));
|
|
void sqlite3_result_double(sqlite3_context*, double);
|
|
void sqlite3_result_error(sqlite3_context*, const char*, int);
|
|
void sqlite3_result_error16(sqlite3_context*, const void*, int);
|
|
void sqlite3_result_int(sqlite3_context*, int);
|
|
void sqlite3_result_int64(sqlite3_context*, long long int);
|
|
void sqlite3_result_null(sqlite3_context*);
|
|
void sqlite3_result_text(sqlite3_context*, const char*, int n, void(*)(void*));
|
|
void sqlite3_result_text16(sqlite3_context*, const void*, int n, void(*)(void*));
|
|
void sqlite3_result_text16be(sqlite3_context*, const void*, int n, void(*)(void*));
|
|
void sqlite3_result_text16le(sqlite3_context*, const void*, int n, void(*)(void*));
|
|
void sqlite3_result_value(sqlite3_context*, sqlite3_value*);
|
|
} {
|
|
User-defined functions invoke the following routines in order to
|
|
set their return value. The sqlite3_result_value() routine is used
|
|
to return an exact copy of one of the parameters to the function.
|
|
|
|
The operation of these routines is very similar to the operation of
|
|
sqlite3_bind_blob() and its cousins. Refer to the documentation there
|
|
for additional information.
|
|
}
|
|
|
|
api {} {
|
|
int sqlite3_set_authorizer(
|
|
sqlite*,
|
|
int (*xAuth)(void*,int,const char*,const char*,const char*,const char*),
|
|
void *pUserData
|
|
);
|
|
#define SQLITE_CREATE_INDEX 1 /* Index Name Table Name */
|
|
#define SQLITE_CREATE_TABLE 2 /* Table Name NULL */
|
|
#define SQLITE_CREATE_TEMP_INDEX 3 /* Index Name Table Name */
|
|
#define SQLITE_CREATE_TEMP_TABLE 4 /* Table Name NULL */
|
|
#define SQLITE_CREATE_TEMP_TRIGGER 5 /* Trigger Name Table Name */
|
|
#define SQLITE_CREATE_TEMP_VIEW 6 /* View Name NULL */
|
|
#define SQLITE_CREATE_TRIGGER 7 /* Trigger Name Table Name */
|
|
#define SQLITE_CREATE_VIEW 8 /* View Name NULL */
|
|
#define SQLITE_DELETE 9 /* Table Name NULL */
|
|
#define SQLITE_DROP_INDEX 10 /* Index Name Table Name */
|
|
#define SQLITE_DROP_TABLE 11 /* Table Name NULL */
|
|
#define SQLITE_DROP_TEMP_INDEX 12 /* Index Name Table Name */
|
|
#define SQLITE_DROP_TEMP_TABLE 13 /* Table Name NULL */
|
|
#define SQLITE_DROP_TEMP_TRIGGER 14 /* Trigger Name Table Name */
|
|
#define SQLITE_DROP_TEMP_VIEW 15 /* View Name NULL */
|
|
#define SQLITE_DROP_TRIGGER 16 /* Trigger Name Table Name */
|
|
#define SQLITE_DROP_VIEW 17 /* View Name NULL */
|
|
#define SQLITE_INSERT 18 /* Table Name NULL */
|
|
#define SQLITE_PRAGMA 19 /* Pragma Name 1st arg or NULL */
|
|
#define SQLITE_READ 20 /* Table Name Column Name */
|
|
#define SQLITE_SELECT 21 /* NULL NULL */
|
|
#define SQLITE_TRANSACTION 22 /* NULL NULL */
|
|
#define SQLITE_UPDATE 23 /* Table Name Column Name */
|
|
#define SQLITE_ATTACH 24 /* Filename NULL */
|
|
#define SQLITE_DETACH 25 /* Database Name NULL */
|
|
|
|
#define SQLITE_DENY 1 /* Abort the SQL statement with an error */
|
|
#define SQLITE_IGNORE 2 /* Don't allow access, but don't generate an error */
|
|
} {
|
|
This routine registers a callback with the SQLite library. The
|
|
callback is invoked (at compile-time, not at run-time) for each
|
|
attempt to access a column of a table in the database. The callback
|
|
returns SQLITE_OK if access is allowed, SQLITE_DENY if the entire
|
|
SQL statement should be aborted with an error and SQLITE_IGNORE
|
|
if the column should be treated as a NULL value.
|
|
|
|
The second parameter to the access authorization function above will
|
|
be one of the values below. These values signify what kind of operation
|
|
is to be authorized. The 3rd and 4th parameters to the authorization
|
|
function will be parameters or NULL depending on which of the following
|
|
codes is used as the second parameter. The 5th parameter is the name
|
|
of the database ("main", "temp", etc.) if applicable. The 6th parameter
|
|
is the name of the inner-most trigger or view that is responsible for
|
|
the access attempt or NULL if this access attempt is directly from
|
|
input SQL code.
|
|
|
|
The return value of the authorization function should be one of the
|
|
constants SQLITE_DENY or SQLITE_IGNORE.
|
|
}
|
|
|
|
api {} {
|
|
int sqlite3_step(sqlite3_stmt*);
|
|
} {
|
|
After an SQL query has been prepared with a call to either
|
|
sqlite3_prepare() or sqlite3_prepare16(), then this function must be
|
|
called one or more times to execute the statement.
|
|
|
|
The return value will be either SQLITE_BUSY, SQLITE_DONE,
|
|
SQLITE_ROW, SQLITE_ERROR, or SQLITE_MISUSE.
|
|
|
|
SQLITE_BUSY means that the database engine attempted to open
|
|
a locked database and there is no busy callback registered.
|
|
Call sqlite3_step() again to retry the open.
|
|
|
|
SQLITE_DONE means that the statement has finished executing
|
|
successfully. sqlite3_step() should not be called again on this virtual
|
|
machine.
|
|
|
|
If the SQL statement being executed returns any data, then
|
|
SQLITE_ROW is returned each time a new row of data is ready
|
|
for processing by the caller. The values may be accessed using
|
|
the sqlite3_column_*() functions described below. sqlite3_step()
|
|
is called again to retrieve the next row of data.
|
|
|
|
SQLITE_ERROR means that a run-time error (such as a constraint
|
|
violation) has occurred. sqlite3_step() should not be called again on
|
|
the VM. More information may be found by calling sqlite3_errmsg().
|
|
|
|
SQLITE_MISUSE means that the this routine was called inappropriately.
|
|
Perhaps it was called on a virtual machine that had already been
|
|
finalized or on one that had previously returned SQLITE_ERROR or
|
|
SQLITE_DONE. Or it could be the case the the same database connection
|
|
is being used simulataneously by two or more threads.
|
|
}
|
|
|
|
api {} {
|
|
void *sqlite3_trace(sqlite*, void(*xTrace)(void*,const char*), void*);
|
|
} {
|
|
Register a function that is called at every invocation of sqlite3_exec()
|
|
or sqlite3_prepare(). This function can be used (for example) to generate
|
|
a log file of all SQL executed against a database. This is frequently
|
|
useful when debugging an application that uses SQLite.
|
|
}
|
|
|
|
api {} {
|
|
void *sqlite3_user_data(sqlite3_context*);
|
|
} {
|
|
The pUserData parameter to the sqlite3_create_function() and
|
|
sqlite3_create_function16() routines used to register user functions
|
|
is available to the implementation of the function using this
|
|
call.
|
|
}
|
|
|
|
api {} {
|
|
const void *sqlite3_value_blob(sqlite3_value*);
|
|
int sqlite3_value_bytes(sqlite3_value*);
|
|
int sqlite3_value_bytes16(sqlite3_value*);
|
|
double sqlite3_value_double(sqlite3_value*);
|
|
int sqlite3_value_int(sqlite3_value*);
|
|
long long int sqlite3_value_int64(sqlite3_value*);
|
|
const unsigned char *sqlite3_value_text(sqlite3_value*);
|
|
const void *sqlite3_value_text16(sqlite3_value*);
|
|
const void *sqlite3_value_text16be(sqlite3_value*);
|
|
const void *sqlite3_value_text16le(sqlite3_value*);
|
|
int sqlite3_value_type(sqlite3_value*);
|
|
} {
|
|
This group of routines returns information about parameters to
|
|
a user-defined function. Function implementations use these routines
|
|
to access their parameters. These routines are the same as the
|
|
sqlite3_column_* routines except that these routines take a single
|
|
sqlite3_value* pointer instead of an sqlite3_stmt* and an integer
|
|
column number.
|
|
}
|
|
|
|
set n 0
|
|
set i 0
|
|
foreach item $apilist {
|
|
set namelist [lindex $item 0]
|
|
foreach name $namelist {
|
|
set n_to_name($n) $name
|
|
set n_to_idx($n) $i
|
|
set name_to_idx($name) $i
|
|
incr n
|
|
}
|
|
incr i
|
|
}
|
|
set i 0
|
|
foreach name [lsort [array names name_to_idx]] {
|
|
set sname($i) $name
|
|
incr i
|
|
}
|
|
puts {<table width="100%" cellpadding="5"><tr>}
|
|
set nrow [expr {($n+2)/3}]
|
|
set i 0
|
|
for {set j 0} {$j<3} {incr j} {
|
|
if {$j>0} {puts {<td width="10"></td>}}
|
|
puts {<td valign="top">}
|
|
set limit [expr {$i+$nrow}]
|
|
puts {<ul>}
|
|
while {$i<$limit && $i<$n} {
|
|
set name $sname($i)
|
|
if {[regexp {^sqlite} $name]} {set display $name} {set display <i>$name</i>}
|
|
puts "<li><a href=\"#$name\">$display</a></li>"
|
|
incr i
|
|
}
|
|
puts {</ul></td>}
|
|
}
|
|
puts "</table>"
|
|
puts "<!-- $n entries. $nrow rows in 3 columns -->"
|
|
|
|
proc resolve_name {ignore_list name} {
|
|
global name_to_idx
|
|
if {![info exists name_to_idx($name)] || [lsearch $ignore_list $name]>=0} {
|
|
return $name
|
|
} else {
|
|
return "<a href=\"#$name\">$name</a>"
|
|
}
|
|
}
|
|
|
|
foreach name [lsort [array names name_to_idx]] {
|
|
set i $name_to_idx($name)
|
|
if {[info exists done($i)]} continue
|
|
set done($i) 1
|
|
foreach {namelist prototype desc} [lindex $apilist $i] break
|
|
foreach name $namelist {
|
|
puts "<a name=\"$name\">"
|
|
}
|
|
puts "<p><hr></p>"
|
|
puts "<blockquote><pre>"
|
|
regsub "^( *\n)+" $prototype {} p2
|
|
regsub "(\n *)+\$" $p2 {} p3
|
|
puts $p3
|
|
puts "</pre></blockquote>"
|
|
regsub -all {\[} $desc {\[} desc
|
|
regsub -all {sqlite3_[a-z0-9_]+} $desc "\[resolve_name $name &\]" d2
|
|
regsub -all "\n( *\n)+" [subst $d2] "</p>\n\n<p>" d3
|
|
puts "<p>$d3</p>"
|
|
}
|
|
|
|
footer $rcsid
|