Question

I’m working on a new iPhone project and I’m running into problems with sqlite. I’ve done this before on a different project and it worked just fine so I’m not sure exactly what is going on with this one. I’m using the same code from before, but the situation is a little different.

First of all, I’m trying this time to use Unit Testing so I’ve created a Cocoa Unit Test Bundle, and I got that working correctly, then I wanted to make a Unit Test for my sqlite database.

The first thing run with this test is [self checkAndCreateDatabase] which is as follows:

-(void) checkAndCreateDatabase{
        BOOL success;

        // Create a FileManager object, we will use this to check the status
        // of the database and to copy it over if required
        NSFileManager *fileManager = [NSFileManager defaultManager];

        // Check if the database has already been created in the users filesystem
        success = [fileManager fileExistsAtPath:databasePath];

        // If the database already exists then return without doing anything
        if(success) return;

        // If not then proceed to copy the database from the application to the users filesystem

        // Get the path to the database in the application package
        NSString *databasePathFromApp = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:databaseName];

        // Copy the database from the package to the users filesystem
        [fileManager copyItemAtPath:databasePathFromApp toPath:databasePath error:nil];

        [fileManager release];
    }

Then I attempt to open the database with the following line:

int result = sqlite3_open([databasePath UTF8String], &database);

This fails everytime with error code 14 SQLITE_CANTOPEN, and databasePath is “/Users/labuser/Library/Application Support/iPhone Simulator/Documents/projectfusion.db3”.

What is odd is that when I go to that directory, Documents/ isn’t there, so if I create that, then it doesn’t fail, BUT projectfusion.db3 then has a size of 0kb; the tables aren’t there. That makes any sqlite3_prepare_v2() fail, because the tables aren’t there. If I manually copy the projectfusion.db3 file to that directory before running, then it works just fine.

Is it because I’m doing this inside the unit tests and the scripts don’t have permission or something? Or is it possibly because I’m working on a school computer at my university and can’t write to that directory? (I tried logging in as admin and it didn’t work either).

Answer 1

Try the code given below,

I’ve set a macro called TEST so I don’t have to keep commenting code out.

- (NSString *)createEditableCopyOfDatabaseIfNeeded {
    // First, test for existence.
    BOOL success;

    NSFileManager *fileManager = [NSFileManager defaultManager];
    NSError *error;
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);

    NSString *documentsDirectory = [paths objectAtIndex:0];

    #ifdef TEST
    documentsDirectory = [[NSFileManager defaultManager] currentDirectoryPath];
    #endif


    NSString *writableDBPath = [documentsDirectory stringByAppendingPathComponent:DBNAME];
    success = [fileManager fileExistsAtPath:writableDBPath];
    if (success) { return writableDBPath;} ;
    // The writable database does not exist, so copy the default to the appropriate location.

    NSString *defaultDBPath = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:DBNAME];    
    #ifdef TEST
    defaultDBPath = [[NSBundle bundleForClass:[self class]] pathForResource:@"YOURDB" ofType:@"sqlite"];
    #endif

    success = [fileManager copyItemAtPath:defaultDBPath toPath:writableDBPath error:&error];
    if (!success) {
        NSAssert1(0, @"Failed to create writable database file with message '%@'.", [error localizedDescription]);
    }
    return (defaultDBPath);
}