DB backend status

Here's the status of the different DB backends. It lists features that only some backends support. This list is probably not complete. - Stig DB driver feature matrix: Symbols: "x" - implementation using native functions, without regression test "X" - implementation using native functions, complete with regression test "e" - emulating implementation, without regression test "E" - emulating implementation, complete with regression test "n" - returns a "not capable" error "-" - no implementation of this feature Each symbol is uppercased as tests are written for the feature. FEATURE ibase msql mssql mysql oci8 odbc pgsql sybase simpleQuery x x x X x x x x numCols x x x X x - x x numRows - - - - - - x - errorNative - - - X x - x - prepare/execute x e e E e e e e sequences - - - E - - - - affectedRows - - - - x - - - fetch modes x x x X x - x x transactions n n n n x - n n