Question

I’m new to the iPhone development and Mac OS, please bear with the silly query. But I tried hard to get into depth but couldn’t found the solution for the problem.

I have created a database in sqlite through command prompt. The database is saved in Users/DNamto/resources.db

But when am trying to open this db in my iPhone application using the following code snippet

// Get the documents directory
    dirPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);

    docsDir = [dirPaths objectAtIndex:0];

    // Build the path to the database file
    databasePath = [[NSString alloc]initWithString: [docsDir stringByAppendingPathComponent:@"resources.db"]];

The database fails to open up.
The database path which the application is searching for is :
/Users/DNamto/Library/Application Support/iPhone Simulator/6.0/Applications/C82C3DAF-4E95-49A7-9A4F-4D69B056DC9D/Documents/resources.db

Can anyone help me to get the correct database path.
Can we hard code the DB path so that my application links to it. If yes then please provide the code snippet.

Answer 1

Add your database in the application & check if the db is present in doc directory or not, if not then you need to copy it in doc directory and then access it.
For cppy the db in doc directory use following code snippet

- (void)copyDatabaseIfNeeded {

    BOOL success;

    NSFileManager *fileManager = [NSFileManager defaultManager];
    success = [fileManager fileExistsAtPath:[self getDBPath]];
    NSString *databasePath = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"dbname.sqlite"];
    if(success)
    {
        return;// remove old one.
    }
    [fileManager copyItemAtPath:databasePath toPath:[self getDBPath] error:nil];
}

To open the db use following code snippet

-(void)openDatabase
{
    @try
    {
        [self copyDatabaseIfNeeded];
        if(sqlite3_open([[self getDBPath] UTF8String], &mainDatabase)==SQLITE_OK)
        {
            NSLog(@"Database opened");
        }
    }
    @catch (NSException *exception)
    {
        NSLog(@"Exception in openDatabase %@ :%@",exception.name,exception.reason);
    }
}

- (NSString *)getDBPath
{
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory , NSUserDomainMask, YES);
    NSString *documentsDir = [paths objectAtIndex:0];
    return [documentsDir stringByAppendingPathComponent:@"dbname.sqlite"];
}

Use following code snippet to close the database.

-(void)closeDatabase:(sqlite3_stmt*)statement
{
    @try
    {
        sqlite3_finalize(statement);
        sqlite3_close(mainDatabase);
    }
    @catch (NSException *exception)
    {
        NSLog(@"Exception in DatabaseController closeDatabase %@ :%@",exception.name,exception.reason);
    }
}