# OSGeo::FDO::Commands::SQL

## Classes
interface | OSGeo::FDO::Commands::SQL::ISQLCommand
| The ISQLCommand interface defines the SQL command, which supports the execution of a SQL statement against an underlying RDBMS. Two execute methods are provided to distinguish between statements that return table data versus those that execute non query type operations. More...
class | OSGeo::FDO::Commands::SQL::ISQLCommandImp
| The ISQLCommandImp class is a concrete implementation of ISQLCommand. The ISQLCommand interface defines the SQL command, which supports the execution of a SQL statement against an underlying RDBMS. Two execute methods are provided to distinguish between statements that return table data versus those that execute non query type operations. More...
interface | OSGeo::FDO::Commands::SQL::ISQLDataReader
| The ISQLDataReader interface provides a forward-only, read-only iterator for reading relational table data. A reference to an ISQLDataReader is returned from the SQLCommands ExecuteReader method. The initial position of the ISQLDataReader interface is prior to the first item. Thus, you must call ReadNext to begin accessing any data. More...
class | OSGeo::FDO::Commands::SQL::ISQLDataReaderImp
| The ISQLDataReaderImp class is a concrete implementation of ISQLDataReader. The ISQLDataReader interface provides a forward-only, read-only iterator for reading relational table data. A reference to an ISQLDataReader is returned from the SQLCommands ExecuteReader method. The initial position of the ISQLDataReader interface is prior to the first item. Thus, you must call ReadNext to begin accessing any data. More...