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Revised documentation for sqlite3_limit(). Added some evidence marks and

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assert() statements to verify sqlite3_limit() behavior.

FossilOrigin-Name: 883b9b7441593200def05d8a482bc92d3dc0e96b
This commit is contained in:
drh
2010-09-07 14:59:15 +00:00
parent 06ae679271
commit 4e93f5bf90
4 changed files with 55 additions and 19 deletions
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28
src/main.c
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@@ -1673,17 +1673,39 @@ static const int aHardLimit[] = {
*/
int sqlite3_limit(sqlite3 *db, int limitId, int newLimit){
int oldLimit;
/* EVIDENCE-OF: R-30189-54097 For each limit category SQLITE_LIMIT_NAME
** there is a hard upper bound set at compile-time by a C preprocessor
** macro called SQLITE_MAX_NAME. (The "_LIMIT_" in the name is changed to
** "_MAX_".)
*/
assert( aHardLimit[SQLITE_LIMIT_LENGTH]==SQLITE_MAX_LENGTH );
assert( aHardLimit[SQLITE_LIMIT_SQL_LENGTH]==SQLITE_MAX_SQL_LENGTH );
assert( aHardLimit[SQLITE_LIMIT_COLUMN]==SQLITE_MAX_COLUMN );
assert( aHardLimit[SQLITE_LIMIT_EXPR_DEPTH]==SQLITE_MAX_EXPR_DEPTH );
assert( aHardLimit[SQLITE_LIMIT_COMPOUND_SELECT]==SQLITE_MAX_COMPOUND_SELECT);
assert( aHardLimit[SQLITE_LIMIT_VDBE_OP]==SQLITE_MAX_VDBE_OP );
assert( aHardLimit[SQLITE_LIMIT_FUNCTION_ARG]==SQLITE_MAX_FUNCTION_ARG );
assert( aHardLimit[SQLITE_LIMIT_ATTACHED]==SQLITE_MAX_ATTACHED );
assert( aHardLimit[SQLITE_LIMIT_LIKE_PATTERN_LENGTH]==
SQLITE_MAX_LIKE_PATTERN_LENGTH );
assert( aHardLimit[SQLITE_LIMIT_VARIABLE_NUMBER]==SQLITE_MAX_VARIABLE_NUMBER);
assert( aHardLimit[SQLITE_LIMIT_TRIGGER_DEPTH]==SQLITE_MAX_TRIGGER_DEPTH );
assert( SQLITE_LIMIT_TRIGGER_DEPTH==(SQLITE_N_LIMIT-1) );
if( limitId<0 || limitId>=SQLITE_N_LIMIT ){
return -1;
}
oldLimit = db->aLimit[limitId];
if( newLimit>=0 ){
if( newLimit>=0 ){ /* IMP: R-52476-28732 */
if( newLimit>aHardLimit[limitId] ){
newLimit = aHardLimit[limitId];
newLimit = aHardLimit[limitId]; /* IMP: R-51463-25634 */
}
db->aLimit[limitId] = newLimit;
}
return oldLimit;
return oldLimit; /* IMP: R-53341-35419 */
}
/*