Can't open SQLite database due out of memory error - ios

Question

I'm having an issue opening my sqlite database for an iPhone app I'm writing. I thought I followed the tutorials verbatim but for some reason I am getting an "Out of memory" error.
-(NSString *) filepath{
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentationDirectory, NSUserDomainMask, YES);
return [[paths objectAtIndex:0] stringByAppendingPathComponent:#"db.sqlite"];
}
-(sqlite3*)openDB{
if(db == NULL){
sqlite3 *newDBConnection;
if(sqlite3_open([[self filepath] UTF8String], &newDBConnection) != SQLITE_OK){
sqlite3_close(db);
NSLog(#"%s SQL error '%s' (%1d)", __FUNCTION__, sqlite3_errmsg(db), sqlite3_errcode(db));
db = NULL;
}
else{
NSLog(#"db opened");
}
}
return db;
}
DB is an ivar and I am calling db = [self openDB]; in the initialization method.

Answer 1

The sqlite3_open is failing because you are using NSDocumentationDirectory instead of NSDocumentDirectory.
The reason you're receiving the "Out of memory" error is that sqlite3_open is updating newDBConnection, but the sqlite3_errmsg is trying to use db (which is still NULL). And whenever you call sqlite3_errmsg with a NULL for the sqlite3 pointer, SQLite somewhat confusingly returns an "Out of memory" message.
Also note that even if you fix the two above issues, note that you are calling sqlite3_errmsg after performing sqlite3_close. Make sure to get your error message before you call sqlite3_close.
E.g. I would suggest:
- (BOOL)openDB {
if (db == NULL) {
int rc;
if ((rc = sqlite3_open([[self filepath] UTF8String], &db)) != SQLITE_OK) {
NSLog(#"%s SQL error '%s' (%d)", __FUNCTION__, sqlite3_errmsg(db), rc);
sqlite3_close(db);
db = NULL;
return false; // open failed
} else {
NSLog(#"db opened");
return true; // open successful
}
}
return true; // already open
}
Note, a minor point, given that sqlite3_open returns the error code, I would just save that directly, rather than calling sqlite3_errcode to get the code that was just returned.