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MySQL 5.1: Item_func_md5 Class Reference

Item_func_md5 Class Reference

#include <item_strfunc.h>

Inheritance diagram for Item_func_md5:

[legend]Collaboration diagram for Item_func_md5:

[legend]List of all members.


Public Member Functions
	Item_func_md5 (Item *a)
String *	val_str (String *)
void	fix_length_and_dec ()
const char *	func_name () const
bool	check_partition_func_processor (byte *bool_arg)
Private Attributes
String	tmp_value

Detailed Description

Definition at line 42 of file item_strfunc.h.

Constructor & Destructor Documentation

Item_func_md5::Item_func_md5 ( Item * a ) [inline]

Definition at line 46 of file item_strfunc.h.

00046 :Item_str_func(a) {}

Member Function Documentation

bool Item_func_md5::check_partition_func_processor ( byte * bool_arg ) [inline, virtual]

Reimplemented from Item.

Definition at line 50 of file item_strfunc.h.

00050 { return 0;}

void Item_func_md5::fix_length_and_dec ( ) [virtual]

Implements Item_result_field.

Definition at line 155 of file item_strfunc.cc.

References Item_func::args, DTCollation::collation, Item::collation, charset_info_st::csname, DERIVATION_COERCIBLE, get_charset_by_csname(), Item::max_length, MY_CS_BINSORT, MYF, and DTCollation::set().

00156 {
00157   max_length=32;
00158   /*
00159     The MD5() function treats its parameter as being a case sensitive. Thus
00160     we set binary collation on it so different instances of MD5() will be
00161     compared properly.
00162   */
00163   args[0]->collation.set(
00164       get_charset_by_csname(args[0]->collation.collation->csname,
00165                             MY_CS_BINSORT,MYF(0)), DERIVATION_COERCIBLE);
00166 }

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const char* Item_func_md5::func_name ( ) const [inline, virtual]

Implements Item_func.

Definition at line 49 of file item_strfunc.h.

00049 { return "md5"; }

String * Item_func_md5::val_str ( String * ) [virtual]

Implements Item.

Definition at line 123 of file item_strfunc.cc.

References String::alloc(), Item_func::args, DBUG_ASSERT, Item::fixed, String::length(), my_MD5Final(), my_MD5Init(), my_MD5Update(), Item::null_value, String::ptr(), and Item::val_str().

00124 {
00125   DBUG_ASSERT(fixed == 1);
00126   String * sptr= args[0]->val_str(str);
00127   if (sptr)
00128   {
00129     my_MD5_CTX context;
00130     uchar digest[16];
00131 
00132     null_value=0;
00133     my_MD5Init (&context);
00134     my_MD5Update (&context,(uchar *) sptr->ptr(), sptr->length());
00135     my_MD5Final (digest, &context);
00136     if (str->alloc(32))                         // Ensure that memory is free
00137     {
00138       null_value=1;
00139       return 0;
00140     }
00141     sprintf((char *) str->ptr(),
00142             "%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x",
00143             digest[0], digest[1], digest[2], digest[3],
00144             digest[4], digest[5], digest[6], digest[7],
00145             digest[8], digest[9], digest[10], digest[11],
00146             digest[12], digest[13], digest[14], digest[15]);
00147     str->length((uint) 32);
00148     return str;
00149   }
00150   null_value=1;
00151   return 0;
00152 }

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Member Data Documentation

String Item_func_md5::tmp_value [private]

Definition at line 44 of file item_strfunc.h.

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 21:37:21 2006 for MySQL 5.1 by

1.4.7