Question

I working on an app that takes input from a text field and puts it into a string. I have a table with a field in it that I want to check the value of the string from the input against the value in the field in the database. I’m new to iOS and fairly new to SQLite.

Code:

-(IBAction)setInput:(id)sender
{
NSString *strStoreNumber;
NSString *strRegNumber;

strStoreNumber = StoreNumber.text;
strRegNumber = RegNumber.text;
lblStoreNumber.text = strStoreNumber;
lblRegNumber.text = strRegNumber;

NSArray* paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,     NSUserDomainMask, YES);
NSString* documentsDirectory = [paths lastObject];
//    NSString* databasePath = [documentsDirectory stringByAppendingPathComponent:@"tblStore.sqlite"];
NSString* databasePath = [[NSBundle mainBundle] pathForResource:@"tblStore" ofType:@"sqlite"];

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

    NSLog(@"Opened sqlite database at %@", databasePath);

    //...stuff
} 
else 
{
    NSLog(@"Failed to open database at %@ with error %s", databasePath, sqlite3_errmsg(database));
    sqlite3_close (database);
}

NSString *querystring;

// create your statement
querystring = [NSString stringWithFormat:@"SELECT strStore FROM tblStore WHERE strStore = %@;", strStoreNumber];  

const char *sql = [querystring UTF8String];

NSString *szStore = nil;
NSString *szReg = nil;


if (sqlite3_prepare_v2(database, sql, -1, &databasePath, NULL)!=SQLITE_OK) //queryString = Statement
{
    NSLog(@"sql problem occured with: %s", sql);
    NSLog(@"%s", sqlite3_errmsg(database));
}
else
{
    // you could handle multiple rows here

    while (sqlite3_step(databasePath) == SQLITE_ROW) // queryString = statement
    {            
        szStore = [NSString stringWithUTF8String:(char*)sqlite3_column_text(databasePath, 0)];
        szReg = [NSString stringWithUTF8String:(char*)sqlite3_column_text(databasePath, 1)];
    } // while        

}

sqlite3_finalize(databasePath);

// Do something with data...  
}

It gets to the line “NSLog(@”Opened sqlite database at %@”, databasePath);”, so it appears as though it has access to the database. However, when I run the app, I get the “NSLog(@”sql problem occured with: %s”, sql);” error, which I can see in the console. Additionally, in the console, it says “No such table: tblStore”.

I created the table using the Firefox add-on SQLite Manager. I added the sqlite3 library to the project. I dragged and dropped the database table I created in SQLite manager into my project, above my two AppDelegate files and my two ViewController files.

Any help or input would be greatly appreciated. Thanks!

EDIT: I have properly added the file to the project, and it appears as though the table is found now. Now I have some strange warnings, though:

“Incompatible pointer types passing ‘const char *’ to parameter of type ‘sqlite3_stmt *’ (aka ‘struct sqlite3_stmt *’)”

This warning appears on the following lines of code:

if (sqlite3_prepare_v2(database, sql, -1, &databasePath, NULL)!=SQLITE_OK)

while (sqlite3_step(sql) == SQLITE_ROW)

szStore = [NSString stringWithUTF8String:(char*)sqlite3_column_text(sql, 0)];

szReg = [NSString stringWithUTF8String:(char*)sqlite3_column_text(sql, 1)];

sqlite3_finalize(sql);

It’s got something to do with “sql”, but I’m unsure of what. Any suggestions?

Answer 1

Your code seems ok – did you copy the db to the ressource folder of your project?

EDIT

Make sure you access your db file with something like that:

    - (void) initializeDB {

        // Get the database from the application bundle
        NSString* path = [[NSBundle mainBundle] pathForResource:@"tblStore" ofType:@"sqlite"];

        if (sqlite3_open([path UTF8String], &database) == SQLITE_OK) 
        {
            NSLog(@"Opening Database"); 
        }
        else
        {
            // Call close to properly clean up
            sqlite3_close(database);

            NSAssert1(0, @"Error: failed to open database: '%s'.", 
                      sqlite3_errmsg(database));
        }

}