Question

How to insert data into table in sqlite iPhone?

I am trying following, but its failing:

 NSString *query=[NSString stringWithFormat:@"insert into %@ (name) values ('%@')", table name,myName ];


 sqlite3 *database;

sqlite3_stmt *createStmt = nil;

if (sqlite3_open([databasePath UTF8String], &database) == SQLITE_OK) {
    if (createStmt == nil) {

        if (sqlite3_prepare_v2(database, [query UTF8String], -1, &createStmt, NULL) != SQLITE_OK) {
            return NO;
        }
        sqlite3_exec(database, [query UTF8String], NULL, NULL, NULL);
        return YES;
    }

    return YES;
}else {
    return NO;
}

I have created table in following manner:

create table if not exists myDets (dets_id integer primary key asc, name text);

I am also using Firefox SQLite plugin to check db. When I try to insert record via firefox into my db it gives me following error:

Failed to insert values
Exception Name: NS_ERROR_STORAGE_IOERR
Exception Message: Component returned failure code: 0x80630002 (NS_ERROR_STORAGE_IOERR)        [mozIStorageStatement.execute]

Badly stuck 🙁

Also, i am running this on iPhone simulator, does it matter?

Please help

Thanks in advance.

Answer 1

• Use parameters and don’t string format your update statement
• Add lots of tracing, check return codes and check for error codes (you’re question isn’t clear what error, issue you’re hitting on iPhone).
• use sqlite3_errmsg to get error messages
• construct your dbPath and log it out. Ensure you can open the db from terminal under the emulator. Remember that sqlite will create a database in memory passively so if you’re path is off and the db doesn’t exist it can be confusing.
• print out your update statement and try it from sqlite cmdline app in terminal in the path you logged.
• if you’re putting the db in the main bundle resources, it’s a template and needs to be copied in order to open and write to it.

Here’s an update function from a sample of mine:

- (void)updateContact: (Contact*)contact error:(NSError**)error
{
    if (![self ensureDatabaseOpen:error])
    {
        return;
    }

    NSLog(@">> ContactManager::updateContact");

    // prep statement
    sqlite3_stmt    *statement;
    NSString *querySQL = @"update contacts set name=?,address=?,phone=? where id=?";
    NSLog(@"query: %@", querySQL);
    const char *query_stmt = [querySQL UTF8String];

    // preparing a query compiles the query so it can be re-used.
    sqlite3_prepare_v2(_contactDb, query_stmt, -1, &statement, NULL);     
    sqlite3_bind_text(statement, 1, [[contact name] UTF8String], -1, SQLITE_STATIC);
    sqlite3_bind_text(statement, 2, [[contact address] UTF8String], -1, SQLITE_STATIC);
    sqlite3_bind_text(statement, 3, [[contact phone] UTF8String], -1, SQLITE_STATIC);
    sqlite3_bind_int64(statement, 4, [[contact id] longLongValue]);

    NSLog(@"bind name: %@", [contact name]);
    NSLog(@"bind address: %@", [contact address]);
    NSLog(@"bind phone: %@", [contact phone]);
    NSLog(@"bind int64: %qi", [[contact id] longLongValue]);

    // process result
    if (sqlite3_step(statement) != SQLITE_DONE)
    {
        NSLog(@"error: %s", sqlite3_errmsg(_contactDb));
    }

    sqlite3_finalize(statement);
}

In the sample, the db is copied from resources to a path and opened. Here’s the ensure opened function I use to do that:

- (BOOL)ensureDatabaseOpen: (NSError **)error
{
    // already created db connection
    if (_contactDb != nil)
    {
        return YES;
    }

    NSLog(@">> ContactManager::ensureDatabaseOpen");    
    if (![self ensureDatabasePrepared:error])
    {
        return NO;
    }

    const char *dbpath = [_dbPath UTF8String]; 
    if (sqlite3_open(dbpath, &_contactDb) != SQLITE_OK &&
        error != nil)
    {
        *error = [[[NSError alloc] initWithDomain:@"ContactsManager" code:1000 userInfo:nil] autorelease];
        return NO;
    }

    NSLog(@"opened");

    return YES;
}

- (BOOL)ensureDatabasePrepared: (NSError **)error
{
    // already prepared
    if ((_dbPath != nil) &&
        ([[NSFileManager defaultManager] fileExistsAtPath:_dbPath]))
    {
        return YES;
    }

    // db in main bundle - cant edit.  copy to library if !exist
    NSString *dbTemplatePath = [[NSBundle mainBundle] pathForResource:@"contacts" ofType:@"db"];
    NSLog(@"%@", dbTemplatePath);

    NSString *libraryPath = [NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES) lastObject];
    _dbPath = [libraryPath stringByAppendingPathComponent:@"contacts.db"];

    NSLog(@"dbPath: %@", _dbPath);

    // copy db from template to library
    if (![[NSFileManager defaultManager] fileExistsAtPath:_dbPath])
    {
        NSLog(@"db not exists");
        NSError *error = nil;
        if (![[NSFileManager defaultManager] copyItemAtPath:dbTemplatePath toPath:_dbPath error:&error])
        {
            return NO;
        }

        NSLog(@"copied");
    }    

    return YES;    
}