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15.17.26. write_row

Purpose

Adds a new row to a table.

Synopsis

virtual int write_row ( buf);  
byte *  buf ;

Description

This is the write_row method.

write_row() inserts a row. No extra() hint is given currently if a bulk load is happening. buf is a byte array of data with a size of table->s->reclength

You can use the field information to extract the data from the native byte array type. Example of this would be: for (Field **field=table->field ; *field ; field++) { ... }

BLOBs must be handled specially:

    
for (ptr= table->s->blob_field, end= ptr + table->s->blob_fields ; ptr != end ; ptr++) 
  { 
        char *data_ptr; 
        uint32 size= ((Field_blob*)table->field[*ptr])->get_length();
        ((Field_blob*)table->field[*ptr])->get_ptr(&data_ptr); 
        ... 
  }

See ha_tina.cc for an example of extracting all of the data as strings. ha_berkeley.cc has an example of how to store it intact by "packing" it for ha_berkeley's own native storage type.

See the note for update_row() on auto_increments and timestamps. This case also applied to write_row().

Called from item_sum.cc, item_sum.cc, sql_acl.cc, sql_insert.cc, sql_insert.cc, sql_select.cc, sql_table.cc, sql_udf.cc, and sql_update.cc.

Parameters

  • buf byte array of data

Return Values

There are no return values.

Usage

          
  

Default Implementation

           { return  HA_ERR_WRONG_COMMAND; }
  

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