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MySQL 5.1: Item_func_hex Class Reference

Item_func_hex Class Reference

#include <item_strfunc.h>

Inheritance diagram for Item_func_hex:

[legend]Collaboration diagram for Item_func_hex:

[legend]List of all members.


Public Member Functions
	Item_func_hex (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 586 of file item_strfunc.h.

Constructor & Destructor Documentation

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

Definition at line 590 of file item_strfunc.h.

00590 :Item_str_func(a) {}

Member Function Documentation

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

Reimplemented from Item.

Definition at line 599 of file item_strfunc.h.

00599 { return 0;}

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

Implements Item_result_field.

Definition at line 593 of file item_strfunc.h.

References Item_func::args, DTCollation::collation, Item::collation, Item::decimals, Item::default_charset(), Item::max_length, charset_info_st::mbmaxlen, and DTCollation::set().

00594   {
00595     collation.set(default_charset());
00596     decimals=0;
00597     max_length=args[0]->max_length*2*collation.collation->mbmaxlen;
00598   }

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

Implements Item_func.

Definition at line 591 of file item_strfunc.h.

00591 { return "hex"; }

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

Implements Item.

Definition at line 2507 of file item_strfunc.cc.

References String::alloc(), Item_func::args, String::copy(), DBUG_ASSERT, DECIMAL_RESULT, Item::default_charset(), Item::fixed, String::length(), longlong2str, LONGLONG_MIN, my_empty_string(), Item::null_value, octet2hex(), String::ptr(), REAL_RESULT, Item_str_func::result_type(), STRING_RESULT, tmp_value, ULONGLONG_MAX, Item_str_func::val_int(), Item::val_real(), and Item::val_str().

02508 {
02509   String *res;
02510   DBUG_ASSERT(fixed == 1);
02511   if (args[0]->result_type() != STRING_RESULT)
02512   {
02513     ulonglong dec;
02514     char ans[65],*ptr;
02515     /* Return hex of unsigned longlong value */
02516     if (args[0]->result_type() == REAL_RESULT ||
02517         args[0]->result_type() == DECIMAL_RESULT)
02518     {
02519       double val= args[0]->val_real();
02520       if ((val <= (double) LONGLONG_MIN) || 
02521           (val >= (double) (ulonglong) ULONGLONG_MAX))
02522         dec=  ~(longlong) 0;
02523       else
02524         dec= (ulonglong) (val + (val > 0 ? 0.5 : -0.5));
02525     }
02526     else
02527       dec= (ulonglong) args[0]->val_int();
02528 
02529     if ((null_value= args[0]->null_value))
02530       return 0;
02531     ptr= longlong2str(dec,ans,16);
02532     if (str->copy(ans,(uint32) (ptr-ans),default_charset()))
02533       return &my_empty_string;                  // End of memory
02534     return str;
02535   }
02536 
02537   /* Convert given string to a hex string, character by character */
02538   res= args[0]->val_str(str);
02539   if (!res || tmp_value.alloc(res->length()*2+1))
02540   {
02541     null_value=1;
02542     return 0;
02543   }
02544   null_value=0;
02545   tmp_value.length(res->length()*2);
02546 
02547   octet2hex((char*) tmp_value.ptr(), res->ptr(), res->length());
02548   return &tmp_value;
02549 }

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Member Data Documentation

String Item_func_hex::tmp_value [private]

Definition at line 588 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 21:33:06 2006 for MySQL 5.1 by

1.4.7