Question

Can you please tell me how to create SQLite DB in iPhone and to perform CRUD operations from objective c program to databases. How to do it programmatically??

I know to create DB and table through command line, but how to do it programmatically??

Help me..

Thank you.

Answer 1

1. Add the libsqlite3.dyllib library to your project. Right-click on the Frameworks group, select Add->Existing Frameworks… and scroll down to select and add libsqlite3.dyllib.

2. #import in your source file.

3. Open or create a database file with the path in an NSString file using this code:

   int error = sqlite3_open ([file cStringUsingEncoding:NSUTF8StringEncoding], &database);
   if (error != SQLITE_OK) {
       NSLog (@"Error result from sqlite3_open(): %d", error);
       sqlite3_close (database);
   }
   

4. Execute commands in an NSString aQuery with this code:

   char *errorMessage = nil;
   int error = sqlite3_exec (database, [aQuery cStringUsingEncoding:NSUTF8StringEncoding], nil, nil, &errorMessage);
   if (error != SQLITE_OK)
       NSLog (@"Error result from sqlite3_exec(): %d: %s", error, errorMessage);
   if (errorMessage != nil)
       sqlite3_free(errorMessage);
   

5. Close the database connection with sqlite3_close (database);

For more info on the C interface, see http://www.sqlite.org/cintro.html.