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15.17.18. position


Provide the MySQL server with position/offset information for last-read row.


virtual void position ( record);  
const byte *  record ;


This is the position method.

position() is called after each call to rnd_next() if the data needs to be ordered. You can do something like the following to store the position: my_store_ptr(ref, ref_length, current_position);

The server uses ref to store data. ref_length in the above case is the size needed to store current_position. ref is just a byte array that the server will maintain. If you are using offsets to mark rows, then current_position should be the offset. If it is a primary key like in BDB, then it needs to be a primary key.

Called from,, and


  • record

Return Values

This function has no return values.


Return offset or retrieval key information for last row.

  Published under the terms of the GNU General Public License Design by Interspire