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/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
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* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
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* Copyright (C) 2008 Sun Microsystems
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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#ifndef DRIZZLED_ITEM_STRING_H
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#define DRIZZLED_ITEM_STRING_H
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#include <drizzled/item/basic_constant.h>
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class Item_string :public Item_basic_constant
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Item_string(const char *str,uint32_t length,
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const CHARSET_INFO * const cs, Derivation dv= DERIVATION_COERCIBLE)
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: m_cs_specified(false)
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str_value.set_or_copy_aligned(str, length, cs);
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collation.set(cs, dv);
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We have to have a different max_length than 'length' here to
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ensure that we get the right length if we do use the item
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to create a new table. In this case max_length must be the maximum
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number of chars for a string of this type because we in CreateField::
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divide the max_length with mbmaxlen).
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max_length= str_value.numchars()*cs->mbmaxlen;
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set_name(str, length, cs);
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decimals=NOT_FIXED_DEC;
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// it is constant => can be used without fix_fields (and frequently used)
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/* Just create an item and do not fill string representation */
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Item_string(const CHARSET_INFO * const cs, Derivation dv= DERIVATION_COERCIBLE)
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: m_cs_specified(false)
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collation.set(cs, dv);
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set_name(NULL, 0, cs);
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decimals= NOT_FIXED_DEC;
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Item_string(const char *name_par, const char *str, uint32_t length,
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const CHARSET_INFO * const cs, Derivation dv= DERIVATION_COERCIBLE)
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: m_cs_specified(false)
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str_value.set_or_copy_aligned(str, length, cs);
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collation.set(cs, dv);
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max_length= str_value.numchars()*cs->mbmaxlen;
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set_name(name_par, 0, cs);
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decimals=NOT_FIXED_DEC;
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// it is constant => can be used without fix_fields (and frequently used)
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enum Type type() const { return STRING_ITEM; }
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String *val_str(String*)
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return (String*) &str_value;
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my_decimal *val_decimal(my_decimal *);
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int save_in_field(Field *field, bool no_conversions);
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enum Item_result result_type () const { return STRING_RESULT; }
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enum_field_types field_type() const { return DRIZZLE_TYPE_VARCHAR; }
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bool basic_const_item() const { return 1; }
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bool eq(const Item *item, bool binary_cmp) const;
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return new Item_string(name, str_value.ptr(),
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str_value.length(), collation.collation);
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Item *safe_charset_converter(const CHARSET_INFO * const tocs);
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inline void append(char *str, uint32_t length)
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str_value.append(str, length);
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max_length= str_value.numchars() * collation.collation->mbmaxlen;
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virtual void print(String *str, enum_query_type query_type);
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Return true if character-set-introducer was explicitly specified in the
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original query for this item (text literal).
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This operation is to be called from Item_string::print(). The idea is
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that when a query is generated (re-constructed) from the Item-tree,
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character-set-introducers should appear only for those literals, where
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they were explicitly specified by the user. Otherwise, that may lead to
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loss collation information (character set introducers implies default
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collation for the literal).
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Basically, that makes sense only for views and hopefully will be gone
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one day when we start using original query as a view definition.
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@return This operation returns the value of m_cs_specified attribute.
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@retval true if character set introducer was explicitly specified in
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@retval false otherwise.
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inline bool is_cs_specified() const
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return m_cs_specified;
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Set the value of m_cs_specified attribute.
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m_cs_specified attribute shows whether character-set-introducer was
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explicitly specified in the original query for this text literal or
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not. The attribute makes sense (is used) only for views.
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This operation is to be called from the parser during parsing an input
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inline void set_cs_specified(bool cs_specified)
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m_cs_specified= cs_specified;
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class Item_static_string_func :public Item_string
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const char *func_name;
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Item_static_string_func(const char *name_par, const char *str, uint32_t length,
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const CHARSET_INFO * const cs,
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Derivation dv= DERIVATION_COERCIBLE)
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:Item_string(NULL, str, length, cs, dv), func_name(name_par)
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Item *safe_charset_converter(const CHARSET_INFO * const tocs);
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virtual inline void print(String *str, enum_query_type)
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str->append(func_name);
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#endif /* DRIZZLED_ITEM_STRING_H */