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Additional documentation on sqlite3_bind_pointer() and sqlite3_result_pointer().

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FossilOrigin-Name: b1572d4e05934a0dc1b73092acba652fa50e97552eb6e9a1cedea7c71055804b
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drh
2017-07-24 15:29:16 +00:00
parent caf8cc1b4b
commit 1d8536bc0f
3 changed files with 19 additions and 11 deletions
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@@ -1,5 +1,5 @@
C Compiler\swarning\sfix\sassociated\swith\sdate/time\sfunctions. C Additional\sdocumentation\son\ssqlite3_bind_pointer()\sand\ssqlite3_result_pointer().\nNo\schanges\sto\scode.
D 2017-07-24T14:44:15.392 D 2017-07-24T15:29:16.514
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@@ -455,7 +455,7 @@ F src/rowset.c 7b7e7e479212e65b723bf40128c7b36dc5afdfac
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src/sqlite.h.in
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@@ -3890,7 +3890,12 @@ typedef struct sqlite3_context sqlite3_context;
** host-language pointers into [application-defined SQL functions]. ** host-language pointers into [application-defined SQL functions].
** ^A parameter that is initialized using [sqlite3_bind_pointer()] appears ** ^A parameter that is initialized using [sqlite3_bind_pointer()] appears
** to be an ordinary SQL NULL value to everything other than ** to be an ordinary SQL NULL value to everything other than
** [sqlite3_value_pointer()]. The T parameter should be a static string. ** [sqlite3_value_pointer()]. The T parameter should be a static string,
** preferably a string literal. The procedure that invokes
** sqlite3_bind_pointer(S,I,P,T) continues to own the P and T pointers and
** must guarantee that those pointers remain valid until after the last
** access via [sqlite3_value_pointer()]. The sqlite3_bind_pointer() routine
** is part of the [pointer passing interface] added for SQLite 3.20.0.
** **
** ^If any of the sqlite3_bind_*() routines are called with a NULL pointer ** ^If any of the sqlite3_bind_*() routines are called with a NULL pointer
** for the [prepared statement] or with a prepared statement for which ** for the [prepared statement] or with a prepared statement for which
@@ -5101,9 +5106,12 @@ typedef void (*sqlite3_destructor_type)(void*);
** also associates the host-language pointer P or type T with that ** also associates the host-language pointer P or type T with that
** NULL value such that the pointer can be retrieved within an ** NULL value such that the pointer can be retrieved within an
** [application-defined SQL function] using [sqlite3_value_pointer()]. ** [application-defined SQL function] using [sqlite3_value_pointer()].
** The T parameter should be a static string. ** The T parameter should be a static string and preferably a string
** This mechanism can be used to pass non-SQL values between ** literal. The procedure that invokes sqlite3_result_pointer(C,P,T)
** application-defined functions. ** continues to own the P and T pointers and must guarantee that
** those pointers remain valid until after the last access via
** [sqlite3_value_pointer()]. The sqlite3_result_pointer() routine
** is part of the [pointer passing interface] added for SQLite 3.20.0.
** **
** If these routines are called from within the different thread ** If these routines are called from within the different thread
** than the one containing the application-defined function that received ** than the one containing the application-defined function that received