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MySQL 5.1: Item_func_insert Class Reference

Item_func_insert Class Reference

#include <item_strfunc.h>

Inheritance diagram for Item_func_insert:

[legend]Collaboration diagram for Item_func_insert:

[legend]List of all members.


Public Member Functions
	Item_func_insert (Item org, Item start, Item length, Item new_str)
String *	val_str (String *)
void	fix_length_and_dec ()
const char *	func_name () const
Private Attributes
String	tmp_value

Detailed Description

Definition at line 130 of file item_strfunc.h.

Constructor & Destructor Documentation

Item_func_insert::Item_func_insert	(	Item *	org,
		Item *	start,
		Item *	length,
		Item *	new_str
	)			`[inline]`

Definition at line 134 of file item_strfunc.h.

00135     :Item_str_func(org,start,length,new_str) {}

Member Function Documentation

void Item_func_insert::fix_length_and_dec ( ) [virtual]

Implements Item_result_field.

Definition at line 986 of file item_strfunc.cc.

References Item_func::agg_arg_charsets(), Item_func::args, Item::collation, MAX_BLOB_WIDTH, Item::max_length, Item::maybe_null, and MY_COLL_ALLOW_CONV.

00987 {
00988   ulonglong max_result_length;
00989 
00990   // Handle character set for args[0] and args[3].
00991   if (agg_arg_charsets(collation, &args[0], 2, MY_COLL_ALLOW_CONV, 3))
00992     return;
00993   max_result_length= ((ulonglong) args[0]->max_length+
00994                       (ulonglong) args[3]->max_length);
00995   if (max_result_length >= MAX_BLOB_WIDTH)
00996   {
00997     max_result_length= MAX_BLOB_WIDTH;
00998     maybe_null= 1;
00999   }
01000   max_length= (ulong) max_result_length;
01001 }

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

Implements Item_func.

Definition at line 138 of file item_strfunc.h.

Referenced by val_str().

00138 { return "insert"; }

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

Implements Item.

Definition at line 948 of file item_strfunc.cc.

References Item_func::args, String::charpos(), copy_if_not_alloced(), current_thd, DBUG_ASSERT, ER, ER_WARN_ALLOWED_PACKET_OVERFLOWED, Item::fixed, func_name(), String::length(), Item::null_value, push_warning_printf(), String::replace(), start(), tmp_value, Item_str_func::val_int(), Item::val_str(), and MYSQL_ERROR::WARN_LEVEL_WARN.

00949 {
00950   DBUG_ASSERT(fixed == 1);
00951   String *res,*res2;
00952   uint start,length;
00953 
00954   null_value=0;
00955   res=args[0]->val_str(str);
00956   res2=args[3]->val_str(&tmp_value);
00957   start=(uint) args[1]->val_int()-1;
00958   length=(uint) args[2]->val_int();
00959   if (args[0]->null_value || args[1]->null_value || args[2]->null_value ||
00960       args[3]->null_value)
00961     goto null; /* purecov: inspected */
00962   start=res->charpos(start);
00963   length=res->charpos(length,start);
00964   if (start > res->length()+1)
00965     return res;                                 // Wrong param; skip insert
00966   if (length > res->length()-start)
00967     length=res->length()-start;
00968   if (res->length() - length + res2->length() >
00969       current_thd->variables.max_allowed_packet)
00970   {
00971     push_warning_printf(current_thd, MYSQL_ERROR::WARN_LEVEL_WARN,
00972                         ER_WARN_ALLOWED_PACKET_OVERFLOWED,
00973                         ER(ER_WARN_ALLOWED_PACKET_OVERFLOWED),
00974                         func_name(), current_thd->variables.max_allowed_packet);
00975     goto null;
00976   }
00977   res=copy_if_not_alloced(str,res,res->length());
00978   res->replace(start,length,*res2);
00979   return res;
00980 null:
00981   null_value=1;
00982   return 0;
00983 }

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Member Data Documentation

String Item_func_insert::tmp_value [private]

Definition at line 132 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 21:34:00 2006 for MySQL 5.1 by

1.4.7