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MySQL 5.1: Item_func_set_collation Class Reference

Item_func_set_collation Class Reference

#include <item_strfunc.h>

Inheritance diagram for Item_func_set_collation:

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Collaboration diagram for Item_func_set_collation:

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List of all members.

Public Member Functions

 Item_func_set_collation (Item *a, Item *b)
String * val_str (String *)
void fix_length_and_dec ()
bool eq (const Item *item, bool binary_cmp) const
const char * func_name () const
enum Functype functype () const
void print (String *str)
Item_field * filed_for_view_update ()

Detailed Description

Definition at line 741 of file item_strfunc.h.

Constructor & Destructor Documentation

Item_func_set_collation::Item_func_set_collation ( Item *  a,
Item *  b 
) [inline]

Definition at line 744 of file item_strfunc.h.

00744 :Item_str_func(a,b) {};

Member Function Documentation

bool Item_func_set_collation::eq ( const Item *  item,
bool  binary_cmp 
) const [virtual]

Reimplemented from Item_func.

Definition at line 2450 of file item_strfunc.cc.

References Item_func::arg_count, Item_func::args, DTCollation::collation, Item::collation, Item::FUNC_ITEM, Item_func::functype(), functype(), and Item::type().

02451 {
02452   /* Assume we don't have rtti */
02453   if (this == item)
02454     return 1;
02455   if (item->type() != FUNC_ITEM)
02456     return 0;
02457   Item_func *item_func=(Item_func*) item;
02458   if (arg_count != item_func->arg_count ||
02459       functype() != item_func->functype())
02460     return 0;
02461   Item_func_set_collation *item_func_sc=(Item_func_set_collation*) item;
02462   if (collation.collation != item_func_sc->collation.collation)
02463     return 0;
02464   for (uint i=0; i < arg_count ; i++)
02465     if (!args[i]->eq(item_func_sc->args[i], binary_cmp))
02466       return 0;
02467   return 1;
02468 }

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Item_field* Item_func_set_collation::filed_for_view_update (  )  [inline, virtual]

Reimplemented from Item.

Definition at line 751 of file item_strfunc.h.

References Item_func::args, and Item::filed_for_view_update().

00752   {
00753     /* this function is transparent for view updating */
00754     return args[0]->filed_for_view_update();
00755   }

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void Item_func_set_collation::fix_length_and_dec (  )  [virtual]

Implements Item_result_field.

Definition at line 2420 of file item_strfunc.cc.

References Item_func::args, binary_keyword, String::c_ptr(), DTCollation::collation, Item::collation, charset_info_st::csname, DERIVATION_EXPLICIT, ER_COLLATION_CHARSET_MISMATCH, ER_UNKNOWN_COLLATION, get_charset_by_csname(), get_charset_by_name(), Item::max_length, my_charset_same(), MY_CS_BINSORT, my_error(), MYF, DTCollation::set(), set_collation, and Item::val_str().

02421 {
02422   CHARSET_INFO *set_collation;
02423   const char *colname;
02424   String tmp, *str= args[1]->val_str(&tmp);
02425   colname= str->c_ptr();
02426   if (colname == binary_keyword)
02427     set_collation= get_charset_by_csname(args[0]->collation.collation->csname,
02428                                          MY_CS_BINSORT,MYF(0));
02429   else
02430   {
02431     if (!(set_collation= get_charset_by_name(colname,MYF(0))))
02432     {
02433       my_error(ER_UNKNOWN_COLLATION, MYF(0), colname);
02434       return;
02435     }
02436   }
02437 
02438   if (!set_collation || 
02439       !my_charset_same(args[0]->collation.collation,set_collation))
02440   {
02441     my_error(ER_COLLATION_CHARSET_MISMATCH, MYF(0),
02442              colname, args[0]->collation.collation->csname);
02443     return;
02444   }
02445   collation.set(set_collation, DERIVATION_EXPLICIT);
02446   max_length= args[0]->max_length;
02447 }

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

Implements Item_func.

Definition at line 748 of file item_strfunc.h.

00748 { return "collate"; }

enum Functype Item_func_set_collation::functype (  )  const [inline, virtual]

Reimplemented from Item_func.

Definition at line 749 of file item_strfunc.h.

References Item_func::COLLATE_FUNC.

Referenced by eq().

00749 { return COLLATE_FUNC; }

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void Item_func_set_collation::print ( String *  str  )  [virtual]

Reimplemented from Item_func.

Definition at line 2471 of file item_strfunc.cc.

References String::append(), Item_func::args, Item::basic_const_item(), DBUG_ASSERT, String::print(), Item::print(), Item::str_value, Item::STRING_ITEM, STRING_WITH_LEN, and Item_func::type().

02472 {
02473   str->append('(');
02474   args[0]->print(str);
02475   str->append(STRING_WITH_LEN(" collate "));
02476   DBUG_ASSERT(args[1]->basic_const_item() &&
02477               args[1]->type() == Item::STRING_ITEM);
02478   args[1]->str_value.print(str);
02479   str->append(')');
02480 }

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

Implements Item.

Definition at line 2410 of file item_strfunc.cc.

References Item_func::args, DTCollation::collation, Item::collation, DBUG_ASSERT, Item::fixed, Item::null_value, String::set_charset(), and Item::val_str().

02411 {
02412   DBUG_ASSERT(fixed == 1);
02413   str=args[0]->val_str(str);
02414   if ((null_value=args[0]->null_value))
02415     return 0;
02416   str->set_charset(collation.collation);
02417   return str;
02418 }

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The documentation for this class was generated from the following files:
Generated on Sat Sep 9 21:42:21 2006 for MySQL 5.1 by  doxygen 1.4.7