How to delete data from sqlite - iphone

Question

I have created a table with three entries name,adress and phone no.
Now i want to delete data based on the name i type in the name text field. I successfully doing this but the problem is that if I type a name which is not in my database label still show 'contact deleted '... Here is my code
-(void)deleteContact{
const char *dbPath=[databasePath UTF8String];
sqlite3_stmt *statement;
if (sqlite3_open(dbPath, &contactDB)==SQLITE_OK)
{
NSString *querySQL=[NSString stringWithFormat:#"delete from
contacts where name=\"%#\"",name.text];
const char *query_stmt=[querySQL UTF8String];
sqlite3_prepare_v2(contactDB, query_stmt,-1,&statement, NULL);
(sqlite3_step(statement)==SQLITE_OK);
status.text=#"Contact Deleted";
name.text=#"";
address.text=#"";
phone.text=#"";
sqlite3_finalize(statement);
}
sqlite3_close(contactDB);
[name resignFirstResponder];
}

Answer 1

Delete is OK even if there is nothing to delete.
If you need to know if there is anything to delete you should check this.
NSString *sql = [NSString stringWithFormat:#"select count (*) from contacts where name=\"%#\"", name.text];
sqlite3_stmt *stmt;
int res = sqlite3_prepare_v2(database, [sql UTF8String], -1, &stmt, NULL);
if (res != SQLITE_OK) {
NSLog(#"sqlite3_prepare_v2() failed");
return;
}
int count = 0;
if (sqlite3_step(stmt) == SQLITE_ROW) {
count = sqlite3_column_int(stmt, 0);
}
sqlite3_finalize(stmt);
if (count == 0) {
// nothing to delete, do whatever you like
} else {
// do real delete
// your code for that seems to be OK
}

Answer 2

delete from YourTable where name = "NameToDelete"
will delete all records with field name equal to NameToDelete from table YourTable.