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642.1.11
by Lee
move functions from item.cc/item.h to item directory |
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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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*
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* Copyright (C) 2008 Sun Microsystems
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*
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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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*
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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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*
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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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*/
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#ifndef DRIZZLED_ITEM_INSERT_VALUE_H
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#define DRIZZLED_ITEM_INSERT_VALUE_H
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/*
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Item_insert_value -- an implementation of VALUES() function.
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You can use the VALUES(col_name) function in the UPDATE clause
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to refer to column values from the INSERT portion of the INSERT
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... UPDATE statement. In other words, VALUES(col_name) in the
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UPDATE clause refers to the value of col_name that would be
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inserted, had no duplicate-key conflict occurred.
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In all other places this function returns NULL.
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*/
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class Item_insert_value : public Item_field |
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{
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public: |
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Item *arg; |
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Item_insert_value(Name_resolution_context *context_arg, Item *a) |
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:Item_field(context_arg, (const char *)NULL, (const char *)NULL, |
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(const char *)NULL), |
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arg(a) {} |
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bool eq(const Item *item, bool binary_cmp) const; |
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bool fix_fields(Session *, Item **); |
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virtual void print(String *str, enum_query_type query_type); |
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int save_in_field(Field *field_arg, bool no_conversions) |
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{
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return Item_field::save_in_field(field_arg, no_conversions); |
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}
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/*
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We use RAND_TABLE_BIT to prevent Item_insert_value from
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being treated as a constant and precalculated before execution
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*/
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table_map used_tables() const { return RAND_TABLE_BIT; } |
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bool walk(Item_processor processor, bool walk_subquery, unsigned char *args) |
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{
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return arg->walk(processor, walk_subquery, args) || |
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(this->*processor)(args); |
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}
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bool check_vcol_func_processor(unsigned char *) |
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{ return true; } |
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};
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#endif /* DRIZZLED_ITEM_INSERT_VALUE_H */ |