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153c62c461
sqlite/src/main.c
drh 153c62c461 The win32 driver compiles but does not yet work well. Many bugs 
fixed. (CVS 4282)

FossilOrigin-Name: 3a68fcddfa9184e4b310ce0a21312c54b9462ec8
2007-08-24 03:51:33 +00:00

1436 lines
41 KiB
C
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/*
** 2001 September 15
**
** The author disclaims copyright to this source code. In place of
** a legal notice, here is a blessing:
**
** May you do good and not evil.
** May you find forgiveness for yourself and forgive others.
** May you share freely, never taking more than you give.
**
*************************************************************************
** Main file for the SQLite library. The routines in this file
** implement the programmer interface to the library. Routines in
** other files are for internal use by SQLite and should not be
** accessed by users of the library.
**
** $Id: main.c,v 1.397 2007/08/24 03:51:34 drh Exp $
*/
#include "sqliteInt.h"
#include <ctype.h>
/*
** The version of the library
*/
const char sqlite3_version[] = SQLITE_VERSION;
const char *sqlite3_libversion(void){ return sqlite3_version; }
int sqlite3_libversion_number(void){ return SQLITE_VERSION_NUMBER; }
/*
** If the following function pointer is not NULL and if
** SQLITE_ENABLE_IOTRACE is enabled, then messages describing
** I/O active are written using this function. These messages
** are intended for debugging activity only.
*/
void (*sqlite3_io_trace)(const char*, ...) = 0;
/*
** If the following global variable points to a string which is the
** name of a directory, then that directory will be used to store
** temporary files.
**
** See also the "PRAGMA temp_store_directory" SQL command.
*/
char *sqlite3_temp_directory = 0;
/*
** This is the default collating function named "BINARY" which is always
** available.
*/
static int binCollFunc(
void *NotUsed,
int nKey1, const void *pKey1,
int nKey2, const void *pKey2
){
int rc, n;
n = nKey1<nKey2 ? nKey1 : nKey2;
rc = memcmp(pKey1, pKey2, n);
if( rc==0 ){
rc = nKey1 - nKey2;
}
return rc;
}
/*
** Another built-in collating sequence: NOCASE.
**
** This collating sequence is intended to be used for "case independant
** comparison". SQLite's knowledge of upper and lower case equivalents
** extends only to the 26 characters used in the English language.
**
** At the moment there is only a UTF-8 implementation.
*/
static int nocaseCollatingFunc(
void *NotUsed,
int nKey1, const void *pKey1,
int nKey2, const void *pKey2
){
int r = sqlite3StrNICmp(
(const char *)pKey1, (const char *)pKey2, (nKey1<nKey2)?nKey1:nKey2);
if( 0==r ){
r = nKey1-nKey2;
}
return r;
}
/*
** Return the ROWID of the most recent insert
*/
sqlite_int64 sqlite3_last_insert_rowid(sqlite3 *db){
return db->lastRowid;
}
/*
** Return the number of changes in the most recent call to sqlite3_exec().
*/
int sqlite3_changes(sqlite3 *db){
return db->nChange;
}
/*
** Return the number of changes since the database handle was opened.
*/
int sqlite3_total_changes(sqlite3 *db){
return db->nTotalChange;
}
/*
** Close an existing SQLite database
*/
int sqlite3_close(sqlite3 *db){
HashElem *i;
int j;
if( !db ){
return SQLITE_OK;
}
if( sqlite3SafetyCheck(db) ){
return SQLITE_MISUSE;
}
sqlite3_mutex_enter(db->mutex);
#ifdef SQLITE_SSE
{
extern void sqlite3SseCleanup(sqlite3*);
sqlite3SseCleanup(db);
}
#endif
sqlite3ResetInternalSchema(db, 0);
/* If a transaction is open, the ResetInternalSchema() call above
** will not have called the xDisconnect() method on any virtual
** tables in the db->aVTrans[] array. The following sqlite3VtabRollback()
** call will do so. We need to do this before the check for active
** SQL statements below, as the v-table implementation may be storing
** some prepared statements internally.
*/
sqlite3VtabRollback(db);
/* If there are any outstanding VMs, return SQLITE_BUSY. */
if( db->pVdbe ){
sqlite3Error(db, SQLITE_BUSY,
"Unable to close due to unfinalised statements");
sqlite3_mutex_leave(db->mutex);
return SQLITE_BUSY;
}
assert( !sqlite3SafetyCheck(db) );
/* FIX ME: db->magic may be set to SQLITE_MAGIC_CLOSED if the database
** cannot be opened for some reason. So this routine needs to run in
** that case. But maybe there should be an extra magic value for the
** "failed to open" state.
**
** TODO: Coverage tests do not test the case where this condition is
** true. It's hard to see how to cause it without messing with threads.
*/
if( db->magic!=SQLITE_MAGIC_CLOSED && sqlite3SafetyOn(db) ){
/* printf("DID NOT CLOSE\n"); fflush(stdout); */
sqlite3_mutex_leave(db->mutex);
return SQLITE_ERROR;
}
for(j=0; j<db->nDb; j++){
struct Db *pDb = &db->aDb[j];
if( pDb->pBt ){
sqlite3BtreeClose(pDb->pBt);
pDb->pBt = 0;
if( j!=1 ){
pDb->pSchema = 0;
}
}
}
sqlite3ResetInternalSchema(db, 0);
assert( db->nDb<=2 );
assert( db->aDb==db->aDbStatic );
for(i=sqliteHashFirst(&db->aFunc); i; i=sqliteHashNext(i)){
FuncDef *pFunc, *pNext;
for(pFunc = (FuncDef*)sqliteHashData(i); pFunc; pFunc=pNext){
pNext = pFunc->pNext;
sqlite3_free(pFunc);
}
}
for(i=sqliteHashFirst(&db->aCollSeq); i; i=sqliteHashNext(i)){
CollSeq *pColl = (CollSeq *)sqliteHashData(i);
/* Invoke any destructors registered for collation sequence user data. */
for(j=0; j<3; j++){
if( pColl[j].xDel ){
pColl[j].xDel(pColl[j].pUser);
}
}
sqlite3_free(pColl);
}
sqlite3HashClear(&db->aCollSeq);
#ifndef SQLITE_OMIT_VIRTUALTABLE
for(i=sqliteHashFirst(&db->aModule); i; i=sqliteHashNext(i)){
Module *pMod = (Module *)sqliteHashData(i);
if( pMod->xDestroy ){
pMod->xDestroy(pMod->pAux);
}
sqlite3_free(pMod);
}
sqlite3HashClear(&db->aModule);
#endif
sqlite3HashClear(&db->aFunc);
sqlite3Error(db, SQLITE_OK, 0); /* Deallocates any cached error strings. */
if( db->pErr ){
sqlite3ValueFree(db->pErr);
}
sqlite3CloseExtensions(db);
db->magic = SQLITE_MAGIC_ERROR;
/* The temp-database schema is allocated differently from the other schema
** objects (using sqliteMalloc() directly, instead of sqlite3BtreeSchema()).
** So it needs to be freed here. Todo: Why not roll the temp schema into
** the same sqliteMalloc() as the one that allocates the database
** structure?
*/
sqlite3_free(db->aDb[1].pSchema);
sqlite3_vfs_release(db->pVfs);
sqlite3_mutex_leave(db->mutex);
sqlite3_mutex_free(db->mutex);
sqlite3_free(db);
return SQLITE_OK;
}
/*
** Rollback all database files.
*/
void sqlite3RollbackAll(sqlite3 *db){
int i;
int inTrans = 0;
assert( sqlite3_mutex_held(db->mutex) );
for(i=0; i<db->nDb; i++){
if( db->aDb[i].pBt ){
if( sqlite3BtreeIsInTrans(db->aDb[i].pBt) ){
inTrans = 1;
}
sqlite3BtreeRollback(db->aDb[i].pBt);
db->aDb[i].inTrans = 0;
}
}
sqlite3VtabRollback(db);
if( db->flags&SQLITE_InternChanges ){
sqlite3ExpirePreparedStatements(db);
sqlite3ResetInternalSchema(db, 0);
}
/* If one has been configured, invoke the rollback-hook callback */
if( db->xRollbackCallback && (inTrans || !db->autoCommit) ){
db->xRollbackCallback(db->pRollbackArg);
}
}
/*
** Return a static string that describes the kind of error specified in the
** argument.
*/
const char *sqlite3ErrStr(int rc){
const char *z;
switch( rc & 0xff ){
case SQLITE_ROW:
case SQLITE_DONE:
case SQLITE_OK: z = "not an error"; break;
case SQLITE_ERROR: z = "SQL logic error or missing database"; break;
case SQLITE_PERM: z = "access permission denied"; break;
case SQLITE_ABORT: z = "callback requested query abort"; break;
case SQLITE_BUSY: z = "database is locked"; break;
case SQLITE_LOCKED: z = "database table is locked"; break;
case SQLITE_NOMEM: z = "out of memory"; break;
case SQLITE_READONLY: z = "attempt to write a readonly database"; break;
case SQLITE_INTERRUPT: z = "interrupted"; break;
case SQLITE_IOERR: z = "disk I/O error"; break;
case SQLITE_CORRUPT: z = "database disk image is malformed"; break;
case SQLITE_FULL: z = "database or disk is full"; break;
case SQLITE_CANTOPEN: z = "unable to open database file"; break;
case SQLITE_EMPTY: z = "table contains no data"; break;
case SQLITE_SCHEMA: z = "database schema has changed"; break;
case SQLITE_TOOBIG: z = "String or BLOB exceeded size limit"; break;
case SQLITE_CONSTRAINT: z = "constraint failed"; break;
case SQLITE_MISMATCH: z = "datatype mismatch"; break;
case SQLITE_MISUSE: z = "library routine called out of sequence";break;
case SQLITE_NOLFS: z = "kernel lacks large file support"; break;
case SQLITE_AUTH: z = "authorization denied"; break;
case SQLITE_FORMAT: z = "auxiliary database format error"; break;
case SQLITE_RANGE: z = "bind or column index out of range"; break;
case SQLITE_NOTADB: z = "file is encrypted or is not a database";break;
default: z = "unknown error"; break;
}
return z;
}
/*
** This routine implements a busy callback that sleeps and tries
** again until a timeout value is reached. The timeout value is
** an integer number of milliseconds passed in as the first
** argument.
*/
static int sqliteDefaultBusyCallback(
void *ptr, /* Database connection */
int count /* Number of times table has been busy */
){
#if OS_WIN || (defined(HAVE_USLEEP) && HAVE_USLEEP)
static const u8 delays[] =
{ 1, 2, 5, 10, 15, 20, 25, 25, 25, 50, 50, 100 };
static const u8 totals[] =
{ 0, 1, 3, 8, 18, 33, 53, 78, 103, 128, 178, 228 };
# define NDELAY (sizeof(delays)/sizeof(delays[0]))
sqlite3 *db = (sqlite3 *)ptr;
int timeout = db->busyTimeout;
int delay, prior;
assert( count>=0 );
if( count < NDELAY ){
delay = delays[count];
prior = totals[count];
}else{
delay = delays[NDELAY-1];
prior = totals[NDELAY-1] + delay*(count-(NDELAY-1));
}
if( prior + delay > timeout ){
delay = timeout - prior;
if( delay<=0 ) return 0;
}
sqlite3OsSleep(db->pVfs, delay*1000);
return 1;
#else
sqlite3 *db = (sqlite3 *)ptr;
int timeout = ((sqlite3 *)ptr)->busyTimeout;
if( (count+1)*1000 > timeout ){
return 0;
}
sqlite3OsSleep(db->pVfs, 1000000);
return 1;
#endif
}
/*
** Invoke the given busy handler.
**
** This routine is called when an operation failed with a lock.
** If this routine returns non-zero, the lock is retried. If it
** returns 0, the operation aborts with an SQLITE_BUSY error.
*/
int sqlite3InvokeBusyHandler(BusyHandler *p){
int rc;
if( p==0 || p->xFunc==0 || p->nBusy<0 ) return 0;
rc = p->xFunc(p->pArg, p->nBusy);
if( rc==0 ){
p->nBusy = -1;
}else{
p->nBusy++;
}
return rc;
}
/*
** This routine sets the busy callback for an Sqlite database to the
** given callback function with the given argument.
*/
int sqlite3_busy_handler(
sqlite3 *db,
int (*xBusy)(void*,int),
void *pArg
){
if( sqlite3SafetyCheck(db) ){
return SQLITE_MISUSE;
}
sqlite3_mutex_enter(db->mutex);
db->busyHandler.xFunc = xBusy;
db->busyHandler.pArg = pArg;
db->busyHandler.nBusy = 0;
sqlite3_mutex_leave(db->mutex);
return SQLITE_OK;
}
#ifndef SQLITE_OMIT_PROGRESS_CALLBACK
/*
** This routine sets the progress callback for an Sqlite database to the
** given callback function with the given argument. The progress callback will
** be invoked every nOps opcodes.
*/
void sqlite3_progress_handler(
sqlite3 *db,
int nOps,
int (*xProgress)(void*),
void *pArg
){
if( !sqlite3SafetyCheck(db) ){
sqlite3_mutex_enter(db->mutex);
if( nOps>0 ){
db->xProgress = xProgress;
db->nProgressOps = nOps;
db->pProgressArg = pArg;
}else{
db->xProgress = 0;
db->nProgressOps = 0;
db->pProgressArg = 0;
}
sqlite3_mutex_leave(db->mutex);
}
}
#endif
/*
** This routine installs a default busy handler that waits for the
** specified number of milliseconds before returning 0.
*/
int sqlite3_busy_timeout(sqlite3 *db, int ms){
if( sqlite3SafetyCheck(db) ){
return SQLITE_MISUSE;
}
if( ms>0 ){
db->busyTimeout = ms;
sqlite3_busy_handler(db, sqliteDefaultBusyCallback, (void*)db);
}else{
sqlite3_busy_handler(db, 0, 0);
}
return SQLITE_OK;
}
/*
** Cause any pending operation to stop at its earliest opportunity.
*/
void sqlite3_interrupt(sqlite3 *db){
if( db && (db->magic==SQLITE_MAGIC_OPEN || db->magic==SQLITE_MAGIC_BUSY) ){
db->u1.isInterrupted = 1;
}
}
/*
** This function is exactly the same as sqlite3_create_function(), except
** that it is designed to be called by internal code. The difference is
** that if a malloc() fails in sqlite3_create_function(), an error code
** is returned and the mallocFailed flag cleared.
*/
int sqlite3CreateFunc(
sqlite3 *db,
const char *zFunctionName,
int nArg,
int enc,
void *pUserData,
void (*xFunc)(sqlite3_context*,int,sqlite3_value **),
void (*xStep)(sqlite3_context*,int,sqlite3_value **),
void (*xFinal)(sqlite3_context*)
){
FuncDef *p;
int nName;
assert( sqlite3_mutex_held(db->mutex) );
if( sqlite3SafetyCheck(db) ){
return SQLITE_MISUSE;
}
if( zFunctionName==0 ||
(xFunc && (xFinal || xStep)) ||
(!xFunc && (xFinal && !xStep)) ||
(!xFunc && (!xFinal && xStep)) ||
(nArg<-1 || nArg>127) ||
(255<(nName = strlen(zFunctionName))) ){
sqlite3Error(db, SQLITE_ERROR, "bad parameters");
return SQLITE_ERROR;
}
#ifndef SQLITE_OMIT_UTF16
/* If SQLITE_UTF16 is specified as the encoding type, transform this
** to one of SQLITE_UTF16LE or SQLITE_UTF16BE using the
** SQLITE_UTF16NATIVE macro. SQLITE_UTF16 is not used internally.
**
** If SQLITE_ANY is specified, add three versions of the function
** to the hash table.
*/
if( enc==SQLITE_UTF16 ){
enc = SQLITE_UTF16NATIVE;
}else if( enc==SQLITE_ANY ){
int rc;
rc = sqlite3CreateFunc(db, zFunctionName, nArg, SQLITE_UTF8,
pUserData, xFunc, xStep, xFinal);
if( rc==SQLITE_OK ){
rc = sqlite3CreateFunc(db, zFunctionName, nArg, SQLITE_UTF16LE,
pUserData, xFunc, xStep, xFinal);
}
if( rc!=SQLITE_OK ){
return rc;
}
enc = SQLITE_UTF16BE;
}
#else
enc = SQLITE_UTF8;
#endif
/* Check if an existing function is being overridden or deleted. If so,
** and there are active VMs, then return SQLITE_BUSY. If a function
** is being overridden/deleted but there are no active VMs, allow the
** operation to continue but invalidate all precompiled statements.
*/
p = sqlite3FindFunction(db, zFunctionName, nName, nArg, enc, 0);
if( p && p->iPrefEnc==enc && p->nArg==nArg ){
if( db->activeVdbeCnt ){
sqlite3Error(db, SQLITE_BUSY,
"Unable to delete/modify user-function due to active statements");
assert( !db->mallocFailed );
return SQLITE_BUSY;
}else{
sqlite3ExpirePreparedStatements(db);
}
}
p = sqlite3FindFunction(db, zFunctionName, nName, nArg, enc, 1);
if( p ){
p->flags = 0;
p->xFunc = xFunc;
p->xStep = xStep;
p->xFinalize = xFinal;
p->pUserData = pUserData;
p->nArg = nArg;
}
return SQLITE_OK;
}
/*
** Create new user functions.
*/
int sqlite3_create_function(
sqlite3 *db,
const char *zFunctionName,
int nArg,
int enc,
void *p,
void (*xFunc)(sqlite3_context*,int,sqlite3_value **),
void (*xStep)(sqlite3_context*,int,sqlite3_value **),
void (*xFinal)(sqlite3_context*)
){
int rc;
sqlite3_mutex_enter(db->mutex);
assert( !db->mallocFailed );
rc = sqlite3CreateFunc(db, zFunctionName, nArg, enc, p, xFunc, xStep, xFinal);
rc = sqlite3ApiExit(db, rc);
sqlite3_mutex_leave(db->mutex);
return rc;
}
#ifndef SQLITE_OMIT_UTF16
int sqlite3_create_function16(
sqlite3 *db,
const void *zFunctionName,
int nArg,
int eTextRep,
void *p,
void (*xFunc)(sqlite3_context*,int,sqlite3_value**),
void (*xStep)(sqlite3_context*,int,sqlite3_value**),
void (*xFinal)(sqlite3_context*)
){
int rc;
char *zFunc8;
sqlite3_mutex_enter(db->mutex);
assert( !db->mallocFailed );
zFunc8 = sqlite3Utf16to8(db, zFunctionName, -1);
rc = sqlite3CreateFunc(db, zFunc8, nArg, eTextRep, p, xFunc, xStep, xFinal);
sqlite3_free(zFunc8);
rc = sqlite3ApiExit(db, rc);
sqlite3_mutex_leave(db->mutex);
return rc;
}
#endif
/*
** Declare that a function has been overloaded by a virtual table.
**
** If the function already exists as a regular global function, then
** this routine is a no-op. If the function does not exist, then create
** a new one that always throws a run-time error.
**
** When virtual tables intend to provide an overloaded function, they
** should call this routine to make sure the global function exists.
** A global function must exist in order for name resolution to work
** properly.
*/
int sqlite3_overload_function(
sqlite3 *db,
const char *zName,
int nArg
){
int nName = strlen(zName);
int rc;
sqlite3_mutex_enter(db->mutex);
if( sqlite3FindFunction(db, zName, nName, nArg, SQLITE_UTF8, 0)==0 ){
sqlite3CreateFunc(db, zName, nArg, SQLITE_UTF8,
0, sqlite3InvalidFunction, 0, 0);
}
rc = sqlite3ApiExit(db, SQLITE_OK);
sqlite3_mutex_leave(db->mutex);
return rc;
}
#ifndef SQLITE_OMIT_TRACE
/*
** Register a trace function. The pArg from the previously registered trace
** is returned.
**
** A NULL trace function means that no tracing is executes. A non-NULL
** trace is a pointer to a function that is invoked at the start of each
** SQL statement.
*/
void *sqlite3_trace(sqlite3 *db, void (*xTrace)(void*,const char*), void *pArg){
void *pOld;
sqlite3_mutex_enter(db->mutex);
pOld = db->pTraceArg;
db->xTrace = xTrace;
db->pTraceArg = pArg;
sqlite3_mutex_leave(db->mutex);
return pOld;
}
/*
** Register a profile function. The pArg from the previously registered
** profile function is returned.
**
** A NULL profile function means that no profiling is executes. A non-NULL
** profile is a pointer to a function that is invoked at the conclusion of
** each SQL statement that is run.
*/
void *sqlite3_profile(
sqlite3 *db,
void (*xProfile)(void*,const char*,sqlite_uint64),
void *pArg
){
void *pOld;
sqlite3_mutex_enter(db->mutex);
pOld = db->pProfileArg;
db->xProfile = xProfile;
db->pProfileArg = pArg;
sqlite3_mutex_leave(db->mutex);
return pOld;
}
#endif /* SQLITE_OMIT_TRACE */
/*** EXPERIMENTAL ***
**
** Register a function to be invoked when a transaction comments.
** If the invoked function returns non-zero, then the commit becomes a
** rollback.
*/
void *sqlite3_commit_hook(
sqlite3 *db, /* Attach the hook to this database */
int (*xCallback)(void*), /* Function to invoke on each commit */
void *pArg /* Argument to the function */
){
void *pOld;
sqlite3_mutex_enter(db->mutex);
pOld = db->pCommitArg;
db->xCommitCallback = xCallback;
db->pCommitArg = pArg;
sqlite3_mutex_leave(db->mutex);
return pOld;
}
/*
** Register a callback to be invoked each time a row is updated,
** inserted or deleted using this database connection.
*/
void *sqlite3_update_hook(
sqlite3 *db, /* Attach the hook to this database */
void (*xCallback)(void*,int,char const *,char const *,sqlite_int64),
void *pArg /* Argument to the function */
){
void *pRet;
sqlite3_mutex_enter(db->mutex);
pRet = db->pUpdateArg;
db->xUpdateCallback = xCallback;
db->pUpdateArg = pArg;
sqlite3_mutex_leave(db->mutex);
return pRet;
}
/*
** Register a callback to be invoked each time a transaction is rolled
** back by this database connection.
*/
void *sqlite3_rollback_hook(
sqlite3 *db, /* Attach the hook to this database */
void (*xCallback)(void*), /* Callback function */
void *pArg /* Argument to the function */
){
void *pRet;
sqlite3_mutex_enter(db->mutex);
pRet = db->pRollbackArg;
db->xRollbackCallback = xCallback;
db->pRollbackArg = pArg;
sqlite3_mutex_leave(db->mutex);
return pRet;
}
/*
** This routine is called to create a connection to a database BTree
** driver. If zFilename is the name of a file, then that file is
** opened and used. If zFilename is the magic name ":memory:" then
** the database is stored in memory (and is thus forgotten as soon as
** the connection is closed.) If zFilename is NULL then the database
** is a "virtual" database for transient use only and is deleted as
** soon as the connection is closed.
**
** A virtual database can be either a disk file (that is automatically
** deleted when the file is closed) or it an be held entirely in memory,
** depending on the values of the TEMP_STORE compile-time macro and the
** db->temp_store variable, according to the following chart:
**
** TEMP_STORE db->temp_store Location of temporary database
** ---------- -------------- ------------------------------
** 0 any file
** 1 1 file
** 1 2 memory
** 1 0 file
** 2 1 file
** 2 2 memory
** 2 0 memory
** 3 any memory
*/
int sqlite3BtreeFactory(
const sqlite3 *db, /* Main database when opening aux otherwise 0 */
const char *zFilename, /* Name of the file containing the BTree database */
int omitJournal, /* if TRUE then do not journal this file */
int nCache, /* How many pages in the page cache */
Btree **ppBtree /* Pointer to new Btree object written here */
){
int btree_flags = 0;
int rc;
assert( sqlite3_mutex_held(db->mutex) );
assert( ppBtree != 0);
if( omitJournal ){
btree_flags |= BTREE_OMIT_JOURNAL;
}
if( db->flags & SQLITE_NoReadlock ){
btree_flags |= BTREE_NO_READLOCK;
}
if( zFilename==0 ){
#if TEMP_STORE==0
/* Do nothing */
#endif
#ifndef SQLITE_OMIT_MEMORYDB
#if TEMP_STORE==1
if( db->temp_store==2 ) zFilename = ":memory:";
#endif
#if TEMP_STORE==2
if( db->temp_store!=1 ) zFilename = ":memory:";
#endif
#if TEMP_STORE==3
zFilename = ":memory:";
#endif
#endif /* SQLITE_OMIT_MEMORYDB */
}
rc = sqlite3BtreeOpen(zFilename, (sqlite3 *)db, ppBtree, btree_flags);
if( rc==SQLITE_OK ){
sqlite3BtreeSetBusyHandler(*ppBtree, (void*)&db->busyHandler);
sqlite3BtreeSetCacheSize(*ppBtree, nCache);
}
return rc;
}
/*
** Return UTF-8 encoded English language explanation of the most recent
** error.
*/
const char *sqlite3_errmsg(sqlite3 *db){
const char *z;
if( !db ){
return sqlite3ErrStr(SQLITE_NOMEM);
}
if( sqlite3SafetyCheck(db) || db->errCode==SQLITE_MISUSE ){
return sqlite3ErrStr(SQLITE_MISUSE);
}
sqlite3_mutex_enter(db->mutex);
assert( !db->mallocFailed );
z = (char*)sqlite3_value_text(db->pErr);
if( z==0 ){
z = sqlite3ErrStr(db->errCode);
}
sqlite3_mutex_leave(db->mutex);
return z;
}
#ifndef SQLITE_OMIT_UTF16
/*
** Return UTF-16 encoded English language explanation of the most recent
** error.
*/
const void *sqlite3_errmsg16(sqlite3 *db){
/* Because all the characters in the string are in the unicode
** range 0x00-0xFF, if we pad the big-endian string with a
** zero byte, we can obtain the little-endian string with
** &big_endian[1].
*/
static const char outOfMemBe[] = {
0, 'o', 0, 'u', 0, 't', 0, ' ',
0, 'o', 0, 'f', 0, ' ',
0, 'm', 0, 'e', 0, 'm', 0, 'o', 0, 'r', 0, 'y', 0, 0, 0
};
static const char misuseBe [] = {
0, 'l', 0, 'i', 0, 'b', 0, 'r', 0, 'a', 0, 'r', 0, 'y', 0, ' ',
0, 'r', 0, 'o', 0, 'u', 0, 't', 0, 'i', 0, 'n', 0, 'e', 0, ' ',
0, 'c', 0, 'a', 0, 'l', 0, 'l', 0, 'e', 0, 'd', 0, ' ',
0, 'o', 0, 'u', 0, 't', 0, ' ',
0, 'o', 0, 'f', 0, ' ',
0, 's', 0, 'e', 0, 'q', 0, 'u', 0, 'e', 0, 'n', 0, 'c', 0, 'e', 0, 0, 0
};
const void *z;
if( !db ){
return (void *)(&outOfMemBe[SQLITE_UTF16NATIVE==SQLITE_UTF16LE?1:0]);
}
if( sqlite3SafetyCheck(db) || db->errCode==SQLITE_MISUSE ){
return (void *)(&misuseBe[SQLITE_UTF16NATIVE==SQLITE_UTF16LE?1:0]);
}
sqlite3_mutex_enter(db->mutex);
assert( !db->mallocFailed );
z = sqlite3_value_text16(db->pErr);
if( z==0 ){
sqlite3ValueSetStr(db->pErr, -1, sqlite3ErrStr(db->errCode),
SQLITE_UTF8, SQLITE_STATIC);
z = sqlite3_value_text16(db->pErr);
}
sqlite3ApiExit(0, 0);
sqlite3_mutex_leave(db->mutex);
return z;
}
#endif /* SQLITE_OMIT_UTF16 */
/*
** Return the most recent error code generated by an SQLite routine. If NULL is
** passed to this function, we assume a malloc() failed during sqlite3_open().
*/
int sqlite3_errcode(sqlite3 *db){
if( !db || db->mallocFailed ){
return SQLITE_NOMEM;
}
if( sqlite3SafetyCheck(db) ){
return SQLITE_MISUSE;
}
return db->errCode & db->errMask;
}
/*
** Create a new collating function for database "db". The name is zName
** and the encoding is enc.
*/
static int createCollation(
sqlite3* db,
const char *zName,
int enc,
void* pCtx,
int(*xCompare)(void*,int,const void*,int,const void*),
void(*xDel)(void*)
){
CollSeq *pColl;
int enc2;
if( sqlite3SafetyCheck(db) ){
return SQLITE_MISUSE;
}
assert( sqlite3_mutex_held(db->mutex) );
/* If SQLITE_UTF16 is specified as the encoding type, transform this
** to one of SQLITE_UTF16LE or SQLITE_UTF16BE using the
** SQLITE_UTF16NATIVE macro. SQLITE_UTF16 is not used internally.
*/
enc2 = enc & ~SQLITE_UTF16_ALIGNED;
if( enc2==SQLITE_UTF16 ){
enc2 = SQLITE_UTF16NATIVE;
}
if( (enc2&~3)!=0 ){
sqlite3Error(db, SQLITE_ERROR, "unknown encoding");
return SQLITE_ERROR;
}
/* Check if this call is removing or replacing an existing collation
** sequence. If so, and there are active VMs, return busy. If there
** are no active VMs, invalidate any pre-compiled statements.
*/
pColl = sqlite3FindCollSeq(db, (u8)enc2, zName, strlen(zName), 0);
if( pColl && pColl->xCmp ){
if( db->activeVdbeCnt ){
sqlite3Error(db, SQLITE_BUSY,
"Unable to delete/modify collation sequence due to active statements");
return SQLITE_BUSY;
}
sqlite3ExpirePreparedStatements(db);
/* If collation sequence pColl was created directly by a call to
** sqlite3_create_collation, and not generated by synthCollSeq(),
** then any copies made by synthCollSeq() need to be invalidated.
** Also, collation destructor - CollSeq.xDel() - function may need
** to be called.
*/
if( (pColl->enc & ~SQLITE_UTF16_ALIGNED)==enc2 ){
CollSeq *aColl = sqlite3HashFind(&db->aCollSeq, zName, strlen(zName));
int j;
for(j=0; j<3; j++){
CollSeq *p = &aColl[j];
if( p->enc==pColl->enc ){
if( p->xDel ){
p->xDel(p->pUser);
}
p->xCmp = 0;
}
}
}
}
pColl = sqlite3FindCollSeq(db, (u8)enc2, zName, strlen(zName), 1);
if( pColl ){
pColl->xCmp = xCompare;
pColl->pUser = pCtx;
pColl->xDel = xDel;
pColl->enc = enc2 | (enc & SQLITE_UTF16_ALIGNED);
}
sqlite3Error(db, SQLITE_OK, 0);
return SQLITE_OK;
}
/*
** This routine does the work of opening a database on behalf of
** sqlite3_open() and sqlite3_open16(). The database filename "zFilename"
** is UTF-8 encoded.
*/
static int openDatabase(
const char *zFilename, /* Database filename UTF-8 encoded */
sqlite3 **ppDb, /* OUT: Returned database handle */
unsigned flags, /* Operational flags */
const char *zVfs /* Name of the VFS to use */
){
sqlite3 *db;
int rc;
CollSeq *pColl;
/* Allocate the sqlite data structure */
db = sqlite3MallocZero( sizeof(sqlite3) );
if( db==0 ) goto opendb_out;
db->mutex = sqlite3_mutex_alloc(SQLITE_MUTEX_RECURSIVE);
if( db->mutex==0 ){
sqlite3_free(db);
db = 0;
goto opendb_out;
}
sqlite3_mutex_enter(db->mutex);
db->pVfs = sqlite3_vfs_find(zVfs);
db->errMask = 0xff;
db->priorNewRowid = 0;
db->nDb = 2;
db->magic = SQLITE_MAGIC_BUSY;
db->aDb = db->aDbStatic;
db->autoCommit = 1;
db->flags |= SQLITE_ShortColNames
#if SQLITE_DEFAULT_FILE_FORMAT<4
| SQLITE_LegacyFileFmt
#endif
#ifdef SQLITE_ENABLE_LOAD_EXTENSION
| SQLITE_LoadExtension
#endif
;
sqlite3HashInit(&db->aFunc, SQLITE_HASH_STRING, 0);
sqlite3HashInit(&db->aCollSeq, SQLITE_HASH_STRING, 0);
#ifndef SQLITE_OMIT_VIRTUALTABLE
sqlite3HashInit(&db->aModule, SQLITE_HASH_STRING, 0);
#endif
/* Add the default collation sequence BINARY. BINARY works for both UTF-8
** and UTF-16, so add a version for each to avoid any unnecessary
** conversions. The only error that can occur here is a malloc() failure.
*/
if( createCollation(db, "BINARY", SQLITE_UTF8, 0, binCollFunc, 0) ||
createCollation(db, "BINARY", SQLITE_UTF16BE, 0, binCollFunc, 0) ||
createCollation(db, "BINARY", SQLITE_UTF16LE, 0, binCollFunc, 0) ||
(db->pDfltColl = sqlite3FindCollSeq(db, SQLITE_UTF8, "BINARY", 6, 0))==0
){
assert( db->mallocFailed );
db->magic = SQLITE_MAGIC_CLOSED;
goto opendb_out;
}
/* Also add a UTF-8 case-insensitive collation sequence. */
createCollation(db, "NOCASE", SQLITE_UTF8, 0, nocaseCollatingFunc, 0);
/* Set flags on the built-in collating sequences */
db->pDfltColl->type = SQLITE_COLL_BINARY;
pColl = sqlite3FindCollSeq(db, SQLITE_UTF8, "NOCASE", 6, 0);
if( pColl ){
pColl->type = SQLITE_COLL_NOCASE;
}
/* Open the backend database driver */
rc = sqlite3BtreeFactory(db, zFilename, 0, SQLITE_DEFAULT_CACHE_SIZE,
&db->aDb[0].pBt);
if( rc!=SQLITE_OK ){
sqlite3Error(db, rc, 0);
db->magic = SQLITE_MAGIC_CLOSED;
goto opendb_out;
}
db->aDb[0].pSchema = sqlite3SchemaGet(db, db->aDb[0].pBt);
db->aDb[1].pSchema = sqlite3SchemaGet(db, 0);
/* The default safety_level for the main database is 'full'; for the temp
** database it is 'NONE'. This matches the pager layer defaults.
*/
db->aDb[0].zName = "main";
db->aDb[0].safety_level = 3;
#ifndef SQLITE_OMIT_TEMPDB
db->aDb[1].zName = "temp";
db->aDb[1].safety_level = 1;
#endif
db->magic = SQLITE_MAGIC_OPEN;
if( db->mallocFailed ){
goto opendb_out;
}
/* Register all built-in functions, but do not attempt to read the
** database schema yet. This is delayed until the first time the database
** is accessed.
*/
sqlite3Error(db, SQLITE_OK, 0);
sqlite3RegisterBuiltinFunctions(db);
/* Load automatic extensions - extensions that have been registered
** using the sqlite3_automatic_extension() API.
*/
(void)sqlite3AutoLoadExtensions(db);
if( sqlite3_errcode(db)!=SQLITE_OK ){
goto opendb_out;
}
#ifdef SQLITE_ENABLE_FTS1
if( !db->mallocFailed ){
extern int sqlite3Fts1Init(sqlite3*);
rc = sqlite3Fts1Init(db);
}
#endif
#ifdef SQLITE_ENABLE_FTS2
if( !db->mallocFailed && rc==SQLITE_OK ){
extern int sqlite3Fts2Init(sqlite3*);
rc = sqlite3Fts2Init(db);
}
#endif
#ifdef SQLITE_ENABLE_FTS3
if( !db->mallocFailed && rc==SQLITE_OK ){
extern int sqlite3Fts3Init(sqlite3*);
rc = sqlite3Fts3Init(db);
}
#endif
#ifdef SQLITE_ENABLE_ICU
if( !db->mallocFailed && rc==SQLITE_OK ){
extern int sqlite3IcuInit(sqlite3*);
rc = sqlite3IcuInit(db);
}
#endif
sqlite3Error(db, rc, 0);
/* -DSQLITE_DEFAULT_LOCKING_MODE=1 makes EXCLUSIVE the default locking
** mode. -DSQLITE_DEFAULT_LOCKING_MODE=0 make NORMAL the default locking
** mode. Doing nothing at all also makes NORMAL the default.
*/
#ifdef SQLITE_DEFAULT_LOCKING_MODE
db->dfltLockMode = SQLITE_DEFAULT_LOCKING_MODE;
sqlite3PagerLockingMode(sqlite3BtreePager(db->aDb[0].pBt),
SQLITE_DEFAULT_LOCKING_MODE);
#endif
opendb_out:
if( db && db->mutex ){
sqlite3_mutex_leave(db->mutex);
}
if( SQLITE_NOMEM==(rc = sqlite3_errcode(db)) ){
sqlite3_close(db);
db = 0;
}
*ppDb = db;
return sqlite3ApiExit(0, rc);
}
/*
** Open a new database handle.
*/
int sqlite3_open(
const char *zFilename,
sqlite3 **ppDb
){
return openDatabase(zFilename, ppDb,
SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE, 0);
}
int sqlite3_open_v2(
const void *filename, /* Database filename (UTF-8) */
sqlite3 **ppDb, /* OUT: SQLite db handle */
int flags, /* Flags */
const char *zVfs /* Name of VFS module to use */
){
return openDatabase(filename, ppDb, flags, zVfs);
}
#ifndef SQLITE_OMIT_UTF16
/*
** Open a new database handle.
*/
int sqlite3_open16(
const void *zFilename,
sqlite3 **ppDb
){
char const *zFilename8; /* zFilename encoded in UTF-8 instead of UTF-16 */
sqlite3_value *pVal;
int rc = SQLITE_NOMEM;
assert( zFilename );
assert( ppDb );
*ppDb = 0;
pVal = sqlite3ValueNew(0);
sqlite3ValueSetStr(pVal, -1, zFilename, SQLITE_UTF16NATIVE, SQLITE_STATIC);
zFilename8 = sqlite3ValueText(pVal, SQLITE_UTF8);
if( zFilename8 ){
rc = openDatabase(zFilename8, ppDb,
SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE, 0);
if( rc==SQLITE_OK && *ppDb ){
rc = sqlite3_exec(*ppDb, "PRAGMA encoding = 'UTF-16'", 0, 0, 0);
if( rc!=SQLITE_OK ){
sqlite3_close(*ppDb);
*ppDb = 0;
}
}
}
sqlite3ValueFree(pVal);
return sqlite3ApiExit(0, rc);
}
#endif /* SQLITE_OMIT_UTF16 */
/*
** Register a new collation sequence with the database handle db.
*/
int sqlite3_create_collation(
sqlite3* db,
const char *zName,
int enc,
void* pCtx,
int(*xCompare)(void*,int,const void*,int,const void*)
){
int rc;
sqlite3_mutex_enter(db->mutex);
assert( !db->mallocFailed );
rc = createCollation(db, zName, enc, pCtx, xCompare, 0);
rc = sqlite3ApiExit(db, rc);
sqlite3_mutex_leave(db->mutex);
return rc;
}
/*
** Register a new collation sequence with the database handle db.
*/
int sqlite3_create_collation_v2(
sqlite3* db,
const char *zName,
int enc,
void* pCtx,
int(*xCompare)(void*,int,const void*,int,const void*),
void(*xDel)(void*)
){
int rc;
sqlite3_mutex_enter(db->mutex);
assert( !db->mallocFailed );
rc = createCollation(db, zName, enc, pCtx, xCompare, xDel);
rc = sqlite3ApiExit(db, rc);
sqlite3_mutex_leave(db->mutex);
return rc;
}
#ifndef SQLITE_OMIT_UTF16
/*
** Register a new collation sequence with the database handle db.
*/
int sqlite3_create_collation16(
sqlite3* db,
const char *zName,
int enc,
void* pCtx,
int(*xCompare)(void*,int,const void*,int,const void*)
){
int rc = SQLITE_OK;
char *zName8;
sqlite3_mutex_enter(db->mutex);
assert( !db->mallocFailed );
zName8 = sqlite3Utf16to8(db, zName, -1);
if( zName8 ){
rc = createCollation(db, zName8, enc, pCtx, xCompare, 0);
sqlite3_free(zName8);
}
rc = sqlite3ApiExit(db, rc);
sqlite3_mutex_leave(db->mutex);
return rc;
}
#endif /* SQLITE_OMIT_UTF16 */
/*
** Register a collation sequence factory callback with the database handle
** db. Replace any previously installed collation sequence factory.
*/
int sqlite3_collation_needed(
sqlite3 *db,
void *pCollNeededArg,
void(*xCollNeeded)(void*,sqlite3*,int eTextRep,const char*)
){
if( sqlite3SafetyCheck(db) ){
return SQLITE_MISUSE;
}
sqlite3_mutex_enter(db->mutex);
db->xCollNeeded = xCollNeeded;
db->xCollNeeded16 = 0;
db->pCollNeededArg = pCollNeededArg;
sqlite3_mutex_leave(db->mutex);
return SQLITE_OK;
}
#ifndef SQLITE_OMIT_UTF16
/*
** Register a collation sequence factory callback with the database handle
** db. Replace any previously installed collation sequence factory.
*/
int sqlite3_collation_needed16(
sqlite3 *db,
void *pCollNeededArg,
void(*xCollNeeded16)(void*,sqlite3*,int eTextRep,const void*)
){
if( sqlite3SafetyCheck(db) ){
return SQLITE_MISUSE;
}
sqlite3_mutex_enter(db->mutex);
db->xCollNeeded = 0;
db->xCollNeeded16 = xCollNeeded16;
db->pCollNeededArg = pCollNeededArg;
sqlite3_mutex_leave(db->mutex);
return SQLITE_OK;
}
#endif /* SQLITE_OMIT_UTF16 */
#ifndef SQLITE_OMIT_GLOBALRECOVER
/*
** This function is now an anachronism. It used to be used to recover from a
** malloc() failure, but SQLite now does this automatically.
*/
int sqlite3_global_recover(){
return SQLITE_OK;
}
#endif
/*
** Test to see whether or not the database connection is in autocommit
** mode. Return TRUE if it is and FALSE if not. Autocommit mode is on
** by default. Autocommit is disabled by a BEGIN statement and reenabled
** by the next COMMIT or ROLLBACK.
**
******* THIS IS AN EXPERIMENTAL API AND IS SUBJECT TO CHANGE ******
*/
int sqlite3_get_autocommit(sqlite3 *db){
return db->autoCommit;
}
#ifdef SQLITE_DEBUG
/*
** The following routine is subtituted for constant SQLITE_CORRUPT in
** debugging builds. This provides a way to set a breakpoint for when
** corruption is first detected.
*/
int sqlite3Corrupt(void){
return SQLITE_CORRUPT;
}
#endif
/*
** This is a convenience routine that makes sure that all thread-specific
** data for this thread has been deallocated.
**
** SQLite no longer uses thread-specific data so this routine is now a
** no-op. It is retained for historical compatibility.
*/
void sqlite3_thread_cleanup(void){
}
/*
** Return meta information about a specific column of a database table.
** See comment in sqlite3.h (sqlite.h.in) for details.
*/
#ifdef SQLITE_ENABLE_COLUMN_METADATA
int sqlite3_table_column_metadata(
sqlite3 *db, /* Connection handle */
const char *zDbName, /* Database name or NULL */
const char *zTableName, /* Table name */
const char *zColumnName, /* Column name */
char const **pzDataType, /* OUTPUT: Declared data type */
char const **pzCollSeq, /* OUTPUT: Collation sequence name */
int *pNotNull, /* OUTPUT: True if NOT NULL constraint exists */
int *pPrimaryKey, /* OUTPUT: True if column part of PK */
int *pAutoinc /* OUTPUT: True if colums is auto-increment */
){
int rc;
char *zErrMsg = 0;
Table *pTab = 0;
Column *pCol = 0;
int iCol;
char const *zDataType = 0;
char const *zCollSeq = 0;
int notnull = 0;
int primarykey = 0;
int autoinc = 0;
/* Ensure the database schema has been loaded */
if( sqlite3SafetyOn(db) ){
return SQLITE_MISUSE;
}
sqlite3_mutex_enter(db->mutex);
rc = sqlite3Init(db, &zErrMsg);
if( SQLITE_OK!=rc ){
goto error_out;
}
/* Locate the table in question */
pTab = sqlite3FindTable(db, zTableName, zDbName);
if( !pTab || pTab->pSelect ){
pTab = 0;
goto error_out;
}
/* Find the column for which info is requested */
if( sqlite3IsRowid(zColumnName) ){
iCol = pTab->iPKey;
if( iCol>=0 ){
pCol = &pTab->aCol[iCol];
}
}else{
for(iCol=0; iCol<pTab->nCol; iCol++){
pCol = &pTab->aCol[iCol];
if( 0==sqlite3StrICmp(pCol->zName, zColumnName) ){
break;
}
}
if( iCol==pTab->nCol ){
pTab = 0;
goto error_out;
}
}
/* The following block stores the meta information that will be returned
** to the caller in local variables zDataType, zCollSeq, notnull, primarykey
** and autoinc. At this point there are two possibilities:
**
** 1. The specified column name was rowid", "oid" or "_rowid_"
** and there is no explicitly declared IPK column.
**
** 2. The table is not a view and the column name identified an
** explicitly declared column. Copy meta information from *pCol.
*/
if( pCol ){
zDataType = pCol->zType;
zCollSeq = pCol->zColl;
notnull = (pCol->notNull?1:0);
primarykey = (pCol->isPrimKey?1:0);
autoinc = ((pTab->iPKey==iCol && pTab->autoInc)?1:0);
}else{
zDataType = "INTEGER";
primarykey = 1;
}
if( !zCollSeq ){
zCollSeq = "BINARY";
}
error_out:
if( sqlite3SafetyOff(db) ){
rc = SQLITE_MISUSE;
}
/* Whether the function call succeeded or failed, set the output parameters
** to whatever their local counterparts contain. If an error did occur,
** this has the effect of zeroing all output parameters.
*/
if( pzDataType ) *pzDataType = zDataType;
if( pzCollSeq ) *pzCollSeq = zCollSeq;
if( pNotNull ) *pNotNull = notnull;
if( pPrimaryKey ) *pPrimaryKey = primarykey;
if( pAutoinc ) *pAutoinc = autoinc;
if( SQLITE_OK==rc && !pTab ){
sqlite3SetString(&zErrMsg, "no such table column: ", zTableName, ".",
zColumnName, 0);
rc = SQLITE_ERROR;
}
sqlite3Error(db, rc, (zErrMsg?"%s":0), zErrMsg);
sqlite3_free(zErrMsg);
rc = sqlite3ApiExit(db, rc);
sqlite3_mutex_leave(db->mutex);
return rc;
}
#endif
/*
** Sleep for a little while. Return the amount of time slept.
*/
int sqlite3_sleep(int ms){
sqlite3_vfs *pVfs;
int rc;
pVfs = sqlite3_vfs_find(0);
/* This function works in milliseconds, but the underlying OsSleep()
** API uses microseconds. Hence the 1000's.
*/
rc = (sqlite3OsSleep(pVfs, 1000*ms)/1000);
sqlite3_vfs_release(pVfs);
return rc;
}
/*
** Enable or disable the extended result codes.
*/
int sqlite3_extended_result_codes(sqlite3 *db, int onoff){
sqlite3_mutex_enter(db->mutex);
db->errMask = onoff ? 0xffffffff : 0xff;
sqlite3_mutex_leave(db->mutex);
return SQLITE_OK;
}
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