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MySQL 5.1: Item_func_left Class Reference

Item_func_left Class Reference

#include <item_strfunc.h>

Inheritance diagram for Item_func_left:

[legend]Collaboration diagram for Item_func_left:

[legend]List of all members.


Public Member Functions
	Item_func_left (Item a, Item b)
String *	val_str (String *)
void	fix_length_and_dec ()
const char *	func_name () const
Private Attributes
String	tmp_value

Detailed Description

Definition at line 185 of file item_strfunc.h.

Constructor & Destructor Documentation

Item_func_left::Item_func_left	(	Item *	a,
		Item *	b
	)			`[inline]`

Definition at line 189 of file item_strfunc.h.

00189 :Item_str_func(a,b) {}

Member Function Documentation

void Item_func_left::fix_length_and_dec ( ) [virtual]

Implements Item_result_field.

Definition at line 1071 of file item_strfunc.cc.

References Item_func::args, Item::collation, Item_str_func::left_right_max_length(), and DTCollation::set().

01072 {
01073   collation.set(args[0]->collation);
01074   left_right_max_length();
01075 }

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const char* Item_func_left::func_name ( ) const [inline, virtual]

Implements Item_func.

Definition at line 192 of file item_strfunc.h.

00192 { return "left"; }

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

Implements Item.

Definition at line 1037 of file item_strfunc.cc.

References Item_func::args, String::charpos(), DBUG_ASSERT, Item::fixed, String::length(), my_empty_string(), Item::null_value, String::set(), tmp_value, Item_str_func::val_int(), and Item::val_str().

01038 {
01039   DBUG_ASSERT(fixed == 1);
01040   String *res  =args[0]->val_str(str);
01041   long length  =(long) args[1]->val_int();
01042   uint char_pos;
01043 
01044   if ((null_value=(args[0]->null_value || args[1]->null_value)))
01045     return 0;
01046   if (length <= 0)
01047     return &my_empty_string;
01048   if (res->length() <= (uint) length ||
01049       res->length() <= (char_pos= res->charpos(length)))
01050     return res;
01051 
01052   tmp_value.set(*res, 0, char_pos);
01053   return &tmp_value;
01054 }

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Member Data Documentation

String Item_func_left::tmp_value [private]

Definition at line 187 of file item_strfunc.h.

Referenced by val_str().

The documentation for this class was generated from the following files:

mysql/src/5.1-dbg/sql/item_strfunc.h
mysql/src/5.1-dbg/sql/item_strfunc.cc

Generated on Sat Sep 9 21:35:21 2006 for MySQL 5.1 by

1.4.7