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MySQL 5.1: Item_func_lpad Class Reference

Item_func_lpad Class Reference

#include <item_strfunc.h>

Inheritance diagram for Item_func_lpad:

[legend]Collaboration diagram for Item_func_lpad:

[legend]List of all members.


Public Member Functions
	Item_func_lpad (Item arg1, Item arg2, Item *arg3)
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
String	lpad_str

Detailed Description

Definition at line 558 of file item_strfunc.h.

Constructor & Destructor Documentation

Item_func_lpad::Item_func_lpad	(	Item *	arg1,
		Item *	arg2,
		Item *	arg3
	)			`[inline]`

Definition at line 562 of file item_strfunc.h.

00563     :Item_str_func(arg1,arg2,arg3) {}

Member Function Documentation

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

Reimplemented from Item.

Definition at line 567 of file item_strfunc.h.

00567 { return 0;}

void Item_func_lpad::fix_length_and_dec ( ) [virtual]

Implements Item_result_field.

Definition at line 2267 of file item_strfunc.cc.

References Item_func::agg_arg_charsets(), Item_func::args, DTCollation::collation, Item::collation, Item_func::const_item(), MAX_BLOB_WIDTH, Item::max_length, Item::maybe_null, charset_info_st::mbmaxlen, MY_COLL_ALLOW_CONV, and Item_str_func::val_int().

02268 {
02269   // Handle character set for args[0] and args[2].
02270   if (agg_arg_charsets(collation, &args[0], 2, MY_COLL_ALLOW_CONV, 2))
02271     return;
02272   
02273   if (args[1]->const_item())
02274   {
02275     ulonglong length= ((ulonglong) args[1]->val_int() *
02276                        collation.collation->mbmaxlen);
02277     if (length >= MAX_BLOB_WIDTH)
02278     {
02279       length= MAX_BLOB_WIDTH;
02280       maybe_null= 1;
02281     }
02282     max_length= (ulong) length;
02283   }
02284   else
02285   {
02286     max_length= MAX_BLOB_WIDTH;
02287     maybe_null= 1;
02288   }
02289 }

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

Implements Item_func.

Definition at line 566 of file item_strfunc.h.

Referenced by val_str().

00566 { return "lpad"; }

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

Implements Item.

Definition at line 2292 of file item_strfunc.cc.

References String::alloc(), String::append(), Item_func::args, String::charpos(), DTCollation::collation, Item::collation, count, current_thd, DBUG_ASSERT, ER, ER_WARN_ALLOWED_PACKET_OVERFLOWED, err, Item::fixed, func_name(), String::length(), lpad_str, charset_info_st::mbmaxlen, Item::null_value, String::numchars(), TaoCrypt::pad, push_warning_printf(), String::set_charset(), tmp_value, Item_str_func::val_int(), Item::val_str(), and MYSQL_ERROR::WARN_LEVEL_WARN.

02293 {
02294   DBUG_ASSERT(fixed == 1);
02295   uint32 res_char_length,pad_char_length;
02296   ulong count= (long) args[1]->val_int(), byte_count;
02297   String *res= args[0]->val_str(&tmp_value);
02298   String *pad= args[2]->val_str(&lpad_str);
02299 
02300   if (!res || args[1]->null_value || !pad)
02301     goto err;
02302 
02303   null_value=0;
02304   res_char_length= res->numchars();
02305 
02306   if (count <= res_char_length)
02307   {
02308     res->length(res->charpos(count));
02309     return res;
02310   }
02311   
02312   pad_char_length= pad->numchars();
02313   byte_count= count * collation.collation->mbmaxlen;
02314   
02315   if (byte_count > current_thd->variables.max_allowed_packet)
02316   {
02317     push_warning_printf(current_thd, MYSQL_ERROR::WARN_LEVEL_WARN,
02318                         ER_WARN_ALLOWED_PACKET_OVERFLOWED,
02319                         ER(ER_WARN_ALLOWED_PACKET_OVERFLOWED),
02320                         func_name(), current_thd->variables.max_allowed_packet);
02321     goto err;
02322   }
02323 
02324   if (args[2]->null_value || !pad_char_length || str->alloc(byte_count))
02325     goto err;
02326   
02327   str->length(0);
02328   str->set_charset(collation.collation);
02329   count-= res_char_length;
02330   while (count >= pad_char_length)
02331   {
02332     str->append(*pad);
02333     count-= pad_char_length;
02334   }
02335   if (count > 0)
02336     str->append(pad->ptr(), pad->charpos(count), collation.collation);
02337 
02338   str->append(*res);
02339   null_value= 0;
02340   return str;
02341 
02342 err:
02343   null_value= 1;
02344   return 0;
02345 }