Question

Ok so I understand that fmdb is totally outdated, and core data is where it s at, but for now, I just need to tweak an app I m working on that uses fmdb to read from a sqlite db in the resources folder.

I need to be able to write to my db. What is the best way to execute queries? I have tried doing the same thing that I do to read from a db:

FMResultSet * set = [[UIApp database] executeQuery:[customQueries selectAll], book];

Where I change the string selectAll from being a SELECT statement into being a INSERT INTO statement and I pass it the variable book to insert, but that doesn t seem to be working...

What am I missing? What do I nee to do to be able to write to my sqlite db?? Thanks!

Answer 1

To insert you would do something like this, where db is a reference to your FMDatabase:

[db executeUpdate:@"insert into theTable (field1, field2) values(?, ?)", 
    theField1, theField2, nil];

Make sure there is a nil at the end of the parameter list (2 question marks in the query means two parameters and a nil), and make sure that you are using NS types as the parameters. If you try to use an int as a parameter, it will crash, you would need to use an NSNumber instead.

Answer 2

FMDatabase* db = [FMDatabase databaseWithPath:dbPath];

FMResultSet *rs = [db executeQuery:@"select * from table"];
while ([rs next]) {
    NSLog(@"%d", [rs intForColumn:@"id"];
}

// Close the result set.
[rs close];  

// Close the database.
[db close];

友情链接