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MySQL 5.1: Item_str_conv Class Reference

Item_str_conv Class Reference

#include <item_strfunc.h>

Inheritance diagram for Item_str_conv:

[legend]Collaboration diagram for Item_str_conv:

[legend]List of all members.


Public Member Functions
	Item_str_conv (Item *item)
String *	val_str (String *)
bool	check_partition_func_processor (byte *bool_arg)
Protected Attributes
uint	multiply
uint(*	converter )(CHARSET_INFO cs, char src, uint srclen, char *dst, uint dstlen)
String	tmp_value

Detailed Description

Definition at line 142 of file item_strfunc.h.

Constructor & Destructor Documentation

Item_str_conv::Item_str_conv ( Item * item ) [inline]

Definition at line 150 of file item_strfunc.h.

00150 :Item_str_func(item) {}

Member Function Documentation

bool Item_str_conv::check_partition_func_processor ( byte * bool_arg ) [inline, virtual]

Reimplemented from Item.

Definition at line 152 of file item_strfunc.h.

00152 { return 0;}

String * Item_str_conv::val_str ( String * ) [virtual]

Implements Item.

Definition at line 1004 of file item_strfunc.cc.

References String::alloc(), Item_func::args, DTCollation::collation, Item::collation, converter, copy_if_not_alloced(), DBUG_ASSERT, Item::fixed, String::length(), multiply, Item::null_value, String::ptr(), String::set_charset(), and tmp_value.

01005 {
01006   DBUG_ASSERT(fixed == 1);
01007   String *res;
01008   if (!(res=args[0]->val_str(str)))
01009   {
01010     null_value=1; /* purecov: inspected */
01011     return 0; /* purecov: inspected */
01012   }
01013   null_value=0;
01014   if (multiply == 1)
01015   {
01016     uint len;
01017     res= copy_if_not_alloced(str,res,res->length());
01018     len= converter(collation.collation, (char*) res->ptr(), res->length(),
01019                                         (char*) res->ptr(), res->length());
01020     DBUG_ASSERT(len <= res->length());
01021     res->length(len);
01022   }
01023   else
01024   {
01025     uint len= res->length() * multiply;
01026     tmp_value.alloc(len);
01027     tmp_value.set_charset(collation.collation);
01028     len= converter(collation.collation, (char*) res->ptr(), res->length(),
01029                                         (char*) tmp_value.ptr(), len);
01030     tmp_value.length(len);
01031     res= &tmp_value;
01032   }
01033   return res;
01034 }