Hello.
I am not sure if it should go here or to devel list, so please bear with me.
I was about to use sqlite3_exe with not null errmsg parameter and became a bit
confused.
Documentation says:
---------------------------
If an error occurs while evaluating the SQL statements passed into
sqlite3_exec(), then execution of the current statement stops and
subsequent statements are skipped. If the 5th parameter to sqlite3_exec()
is not NULL then any error message is written into memory obtained
from sqlite3_malloc() and passed back through the 5th parameter.
To avoid memory leaks, the application should invoke sqlite3_free() on error
message strings returned through the 5th parameter of
of sqlite3_exec() after the error message string is no longer needed.
If the 5th parameter to sqlite3_exec() is not NULL and no errors
occur, then sqlite3_exec() sets the pointer in its 5th parameter to
NULL before returning.
-------------------------
I was planing to use this function like following:
-------------------------------
int res;
char *errmsg;
res = sqlite3_exec( db, zSql, NULL, NULL, &errmsg );
if ( res != SQLITE_OK) {
fprintf( stderr, "%s", errmsg)
sqlite3_free( errmsg )
}
-----------------------------------
But then I looked at sqlite3_exec code and saw following
-----------------------------------
*/
SQLITE_API int sqlite3_exec(
sqlite3 *db, /* The database on which the SQL executes */
const char *zSql, /* The SQL to be executed */
sqlite3_callback xCallback, /* Invoke this callback routine */
void *pArg, /* First argument to xCallback() */
char **pzErrMsg /* Write error messages here */
){
int rc = SQLITE_OK; /* Return code */
const char *zLeftover; /* Tail of unprocessed SQL */
sqlite3_stmt *pStmt = 0; /* The current SQL statement */
char **azCols = 0; /* Names of result columns */
int callbackIsInit; /* True if callback data is initialized */
if( !sqlite3SafetyCheckOk(db) ) return SQLITE_MISUSE_BKPT;
....
-----------------------------------------------------------------
i.e if sqlite3SafetyCheckOk failed, then returned value is not SQLITE_OK on one
side
and pzErrMsg will be left untouched.
Of course I can check myself for SQLITE_MISUSE_BKPT and in this cases give
error message myself,
but it is ugly.
Anyway looks to me as either bug in the code or in the documentation.
Or I am missing something?
Valery.
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