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MySQL 5.1: Item_func_repeat Class Reference

Item_func_repeat Class Reference

#include <item_strfunc.h>

Inheritance diagram for Item_func_repeat:

[legend]Collaboration diagram for Item_func_repeat:

[legend]List of all members.


Public Member Functions
	Item_func_repeat (Item arg1, Item arg2)
String *	val_str (String *)
void	fix_length_and_dec ()
const char *	func_name () const
Private Attributes
String	tmp_value

Detailed Description

Definition at line 534 of file item_strfunc.h.

Constructor & Destructor Documentation

Item_func_repeat::Item_func_repeat	(	Item *	arg1,
		Item *	arg2
	)			`[inline]`

Definition at line 538 of file item_strfunc.h.

00538 :Item_str_func(arg1,arg2) {}

Member Function Documentation

void Item_func_repeat::fix_length_and_dec ( ) [virtual]

Implements Item_result_field.

Definition at line 2116 of file item_strfunc.cc.

References Item_func::args, Item::collation, Item_func::const_item(), MAX_BLOB_WIDTH, Item::max_length, Item::maybe_null, DTCollation::set(), and Item_str_func::val_int().

02117 {
02118   collation.set(args[0]->collation);
02119   if (args[1]->const_item())
02120   {
02121     ulonglong max_result_length= ((ulonglong) args[0]->max_length *
02122                                   args[1]->val_int());
02123     if (max_result_length >= MAX_BLOB_WIDTH)
02124     {
02125       max_result_length= MAX_BLOB_WIDTH;
02126       maybe_null= 1;
02127     }
02128     max_length= (ulong) max_result_length;
02129   }
02130   else
02131   {
02132     max_length= MAX_BLOB_WIDTH;
02133     maybe_null= 1;
02134   }
02135 }

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

Implements Item_func.

Definition at line 541 of file item_strfunc.h.

Referenced by val_str().

00541 { return "repeat"; }

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

Implements Item.

Definition at line 2142 of file item_strfunc.cc.

References alloc_buffer(), Item_func::args, count, current_thd, DBUG_ASSERT, ER, ER_WARN_ALLOWED_PACKET_OVERFLOWED, err, Item::fixed, func_name(), String::length(), memcpy, my_empty_string(), Item::null_value, String::ptr(), push_warning_printf(), tmp_value, to, Item_str_func::val_int(), Item::val_str(), and MYSQL_ERROR::WARN_LEVEL_WARN.

02143 {
02144   DBUG_ASSERT(fixed == 1);
02145   uint length,tot_length;
02146   char *to;
02147   long count= (long) args[1]->val_int();
02148   String *res =args[0]->val_str(str);
02149 
02150   if (args[0]->null_value || args[1]->null_value)
02151     goto err;                           // string and/or delim are null
02152   null_value=0;
02153   if (count <= 0)                       // For nicer SQL code
02154     return &my_empty_string;
02155   if (count == 1)                       // To avoid reallocs
02156     return res;
02157   length=res->length();
02158   // Safe length check
02159   if (length > current_thd->variables.max_allowed_packet/count)
02160   {
02161     push_warning_printf(current_thd, MYSQL_ERROR::WARN_LEVEL_WARN,
02162                         ER_WARN_ALLOWED_PACKET_OVERFLOWED,
02163                         ER(ER_WARN_ALLOWED_PACKET_OVERFLOWED),
02164                         func_name(), current_thd->variables.max_allowed_packet);
02165     goto err;
02166   }
02167   tot_length= length*(uint) count;
02168   if (!(res= alloc_buffer(res,str,&tmp_value,tot_length)))
02169     goto err;
02170 
02171   to=(char*) res->ptr()+length;
02172   while (--count)
02173   {
02174     memcpy(to,res->ptr(),length);
02175     to+=length;
02176   }
02177   return (res);
02178 
02179 err:
02180   null_value=1;
02181   return 0;
02182 }

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Member Data Documentation

String Item_func_repeat::tmp_value [private]

Definition at line 536 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 21:41:11 2006 for MySQL 5.1 by

1.4.7