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15.17.22. rnd_pos

Purpose

Return row based on position.

Synopsis

virtual int rnd_pos ( buf,  
  pos);  
byte *  buf ;
byte *  pos ;

Description

This is the rnd_pos method.

Used for finding row previously marked with position. This is useful for large sorts.

This is like rnd_next, but you are given a position to use to determine the row. The position will be of the type that you stored in ref. You can use ha_get_ptr(pos,ref_length) to retrieve whatever key or position you saved when position() was called. Called from filesort.cc records.cc sql_insert.cc sql_select.cc sql_update.cc.

Parameters

  • buf

  • pos

Return Values

This function has no return values.

Usage

Locate row based on position value and return in buffer provided.


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