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Updates to the documentation on the sqlite3_create_function() family of

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interfaces.

FossilOrigin-Name: 9d277e0b82ff8759369b43ee5f2e5628724a84bd
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drh 2010-09-10 16:38:30 +00:00
parent ce2198c237
commit c20207374d
3 changed files with 24 additions and 22 deletions
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C Updates\sto\sthe\sdocumentation\son\sthe\ssqlite3_create_function()\sfamily\sof\ninterfaces.
D 2010-09-10T16:38:30
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26
src/sqlite.h.in
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@ -3290,21 +3290,22 @@ int sqlite3_reset(sqlite3_stmt *pStmt);
** KEYWORDS: {application-defined SQL function}
** KEYWORDS: {application-defined SQL functions}
**
** ^These two functions (collectively known as "function creation routines")
** ^These functions (collectively known as "function creation routines")
** are used to add SQL functions or aggregates or to redefine the behavior
** of existing SQL functions or aggregates. The only difference 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().
** of existing SQL functions or aggregates. The only differences between
** these routines are the text encoding expected for
** the the second parameter (the name of the function being created)
** and the presence or absence of a destructor callback for
** the application data pointer.
**
** ^The first parameter is the [database connection] to which the SQL
** function is to be added. ^If an application uses more than one database
** connection then application-defined SQL functions must be added
** to each database connection separately.
**
** The second parameter is the name of the SQL function to be created or
** ^The second parameter is the name of the SQL function to be created or
** redefined. ^The length of the name is limited to 255 bytes, exclusive of
** the zero-terminator. Note that the name length limit is in bytes, not
** the zero-terminator. ^Note that the name length limit is in bytes, not
** characters. ^Any attempt to create a function with a longer name
** will result in [SQLITE_ERROR] being returned.
**
@ -3316,7 +3317,7 @@ int sqlite3_reset(sqlite3_stmt *pStmt);
** parameter is less than -1 or greater than 127 then the behavior is
** undefined.
**
** The fourth parameter, eTextRep, specifies what
** ^The fourth parameter, eTextRep, specifies what
** [SQLITE_UTF8 | text encoding] this SQL function prefers for
** its parameters. Any SQL function implementation should be able to work
** work with UTF-8, UTF-16le, or UTF-16be. But some implementations may be
@ -3331,13 +3332,14 @@ int sqlite3_reset(sqlite3_stmt *pStmt);
** ^(The fifth parameter is an arbitrary pointer. The implementation of the
** function can gain access to this pointer using [sqlite3_user_data()].)^
**
** The seventh, eighth and ninth parameters, xFunc, xStep and xFinal, are
** ^The seventh, eighth and ninth parameters, xFunc, xStep and xFinal, are
** pointers to C-language functions that implement the SQL function or
** aggregate. ^A scalar SQL function requires an implementation of the xFunc
** callback only; NULL pointers should be passed as the xStep and xFinal
** callback only; NULL pointers must be passed as the xStep and xFinal
** parameters. ^An aggregate SQL function requires an implementation of xStep
** and xFinal and NULL should be passed for xFunc. ^To delete an existing
** SQL function or aggregate, pass NULL for all three function callbacks.
** and xFinal and NULL pointer must be passed for xFunc. ^To delete an existing
** SQL function or aggregate, pass NULL poiners for all three function
** callbacks.
**
** ^It is permitted to register multiple implementations of the same
** functions with the same name but with either differing numbers of