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MySQL 5.1: Item_func_quote Class Reference

Item_func_quote Class Reference

#include <item_strfunc.h>

Inheritance diagram for Item_func_quote:

[legend]Collaboration diagram for Item_func_quote:

[legend]List of all members.


Public Member Functions
	Item_func_quote (Item *a)
const char *	func_name () const
String *	val_str (String *)
void	fix_length_and_dec ()
bool	check_partition_func_processor (byte *bool_arg)
Private Attributes
String	tmp_value

Detailed Description

Definition at line 682 of file item_strfunc.h.

Constructor & Destructor Documentation

Item_func_quote::Item_func_quote ( Item * a ) [inline]

Definition at line 686 of file item_strfunc.h.

00686 :Item_str_func(a) {}

Member Function Documentation

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

Reimplemented from Item.

Definition at line 694 of file item_strfunc.h.

00694 { return 0;}

void Item_func_quote::fix_length_and_dec ( ) [inline, virtual]

Implements Item_result_field.

Definition at line 689 of file item_strfunc.h.

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

00690   {
00691     collation.set(args[0]->collation);
00692     max_length= args[0]->max_length * 2 + 2;
00693   }

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

Implements Item_func.

Definition at line 687 of file item_strfunc.h.

00687 { return "quote"; }

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

Implements Item.

Definition at line 2796 of file item_strfunc.cc.

References String::alloc(), Item_func::args, DTCollation::collation, Item::collation, String::copy(), DBUG_ASSERT, Item::fixed, from, get_esc_bit, String::length(), Item::null_value, String::ptr(), String::set_charset(), start(), STRING_WITH_LEN, tmp_value, to, and Item::val_str().

02797 {
02798   DBUG_ASSERT(fixed == 1);
02799   /*
02800     Bit mask that has 1 for set for the position of the following characters:
02801     0, \, ' and ^Z
02802   */
02803 
02804   static uchar escmask[32]=
02805   {
02806     0x01, 0x00, 0x00, 0x04, 0x80, 0x00, 0x00, 0x00,
02807     0x00, 0x00, 0x00, 0x10, 0x00, 0x00, 0x00, 0x00,
02808     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
02809     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
02810   };
02811 
02812   char *from, *to, *end, *start;
02813   String *arg= args[0]->val_str(str);
02814   uint arg_length, new_length;
02815   if (!arg)                                     // Null argument
02816   {
02817     /* Return the string 'NULL' */
02818     str->copy(STRING_WITH_LEN("NULL"), collation.collation);
02819     null_value= 0;
02820     return str;
02821   }
02822 
02823   arg_length= arg->length();
02824   new_length= arg_length+2; /* for beginning and ending ' signs */
02825 
02826   for (from= (char*) arg->ptr(), end= from + arg_length; from < end; from++)
02827     new_length+= get_esc_bit(escmask, (uchar) *from);
02828 
02829   if (tmp_value.alloc(new_length))
02830     goto null;
02831 
02832   /*
02833     We replace characters from the end to the beginning
02834   */
02835   to= (char*) tmp_value.ptr() + new_length - 1;
02836   *to--= '\'';
02837   for (start= (char*) arg->ptr(),end= start + arg_length; end-- != start; to--)
02838   {
02839     /*
02840       We can't use the bitmask here as we want to replace \O and ^Z with 0
02841       and Z
02842     */
02843     switch (*end)  {
02844     case 0:
02845       *to--= '0';
02846       *to=   '\\';
02847       break;
02848     case '\032':
02849       *to--= 'Z';
02850       *to=   '\\';
02851       break;
02852     case '\'':
02853     case '\\':
02854       *to--= *end;
02855       *to=   '\\';
02856       break;
02857     default:
02858       *to= *end;
02859       break;
02860     }
02861   }
02862   *to= '\'';
02863   tmp_value.length(new_length);
02864   tmp_value.set_charset(collation.collation);
02865   null_value= 0;
02866   return &tmp_value;
02867 
02868 null:
02869   null_value= 1;
02870   return 0;
02871 }

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Member Data Documentation

String Item_func_quote::tmp_value [private]

Definition at line 684 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 21:40:44 2006 for MySQL 5.1 by

1.4.7