I am trying to open a sqlite db in the viewDidLoad routine and trying to send a sql query through to the db, but the sqlite_step() fails every time. I am not sure what\'s wrong
I did this but it still doesn't work, as in nothing shows up in the Console.
#import "RootViewController.h" #import "FMDatabase.h" @implementation RootViewController - (void)viewDidLoad { [super viewDidLoad]; NSString *dbname = @"name.sqlite"; NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); NSString *documentsDirectory = [paths objectAtIndex:0]; NSString *path = [documentsDirectory stringByAppendingPathComponent:dbname]; FMDatabase * database = [FMDatabase databaseWithPath:path]; FMResultSet *rs = [database executeQuery:@"select * from name;"]; while ([rs next]) { NSLog(@"%d %@", [rs intForColumn:@"nid"], [rs stringForColumn:@"name"]); } [database close]; } ...
And sorry but am unable to use the code block, so using a pre again.
Edit: When I turn logging on in FMDB, like this:
FMDatabase * database = [FMDatabase databaseWithPath:path]; [database setLogsErrors:YES]; if (![database open]) { NSLog(@"Could not open db."); } else { NSLog(@"DB Open...."); } FMResultSet *rs = [database executeQuery:@"select * from 'name';"]; while ([rs next]) { // just print out what we've got in a number of formats. NSLog(@"%d %@", [rs intForColumn:@"nid"], [rs stringForColumn:@"name"]); } [database close];
..., I get this in the Console:
[Session started at 2010-09-07 15:38:16 +0530.] 2010-09-07 15:38:19.178 MyDBTry[13670:207] DB Open.... 2010-09-07 15:38:19.181 MyDBTry[13670:207] DB Error: 1 "no such table: name" 2010-09-07 15:38:19.182 MyDBTry[13670:207] DB Query: select * from name;
Have you verified that the statement compiles OK? You have the success = sqlite3_prepare_v2(...);
line, but never do anything if success
is not SQLITE_OK
. Have you verified that it is SQLITE_OK
?
On the other hand, if you were to use a wrapper like FMDB, you could replace all of your code above with:
- (void)viewDidLoad {
[super viewDidLoad];
NSString *dbname = @"name.sqlite";
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *path = [documentsDirectory stringByAppendingPathComponent:dbname];
FMDatabase * database = [FMDatabase databaseWithPath:path];
[database executeUpdate:@"insert into name(nid, name) values(?, ?)", [NSNumber numberWithInt:6], @"testname"];
[database close];
}
This, IMO, is much easier to debug.