iOS FMDB Sqlite wrapper. Out of memory - ios

Question

The following code :
-(NSArray *)getContentsWithContextTypes:(NSArray *)contextTypes
contextData:(NSArray *)contextData
{
__block NSString *query = #"SELECT * FROM Texts_original1 WHERE ";
[contextData enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
NSString *attributeName = [self.contextTypeToDBQueryTexts
objectForKey:contextTypes[idx]];
query = [query stringByAppendingFormat:#"%# = \"%#\"", attributeName, obj];
if(idx != contextData.count - 1)
{
query = [query stringByAppendingString:#" AND "];
}
}];
[self.db open];
FMResultSet *results = [self.db executeQuery:query];
NSMutableArray *array = [NSMutableArray array];
while([results next])
{
Content *content = [[TextualContent alloc] initWithResults:results];
[array addObject:content];
}
[self.db close];
return array;
}
Generates the following error when I run it :
Error calling sqlite3_step (21: out of memory) rs
It happens half way through the loop. There should be 33 results. After 17 I get that error and the loop exits. Any Ideas? Thanks.

Answer 1

It's important to know that you close the FMResultSet object, as it will cause memory problems.
Do it as follows, [resultSet close]
I am not getting into your code logic but, I will make some modifications in database code.
Try the following:
-(NSArray *)getContentsWithContextTypes:(NSArray *)contextTypes
contextData:(NSArray *)contextData
{
__block NSString *query = #"SELECT * FROM Texts_original1 WHERE ";
[contextData enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop)
{
NSString *attributeName = [self.contextTypeToDBQueryTexts
objectForKey:contextTypes[idx]];
query = [query stringByAppendingFormat:#"%# = \"%#\"", attributeName, obj];
if(idx != contextData.count - 1)
{
query = [query stringByAppendingString:#" AND "];
}
}];
self.db = [FMDatabase databaseWithPath:[self getDBPath]];
if(![db open])
{
NSLog(#"Could not open DB");
return nil;
}
FMResultSet *results = [self.db executeQuery:query];
NSMutableArray *array = [NSMutableArray array];
while([results next])
{
Content *content = [[TextualContent alloc] initWithResults:results];
[array addObject:content];
}
[results close]; //VERY IMPORTANT!
[self.db close];
return array;
}