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/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
*
* Copyright (C) 2008 Sun Microsystems, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "config.h"
#include <float.h>
#include <drizzled/function/get_user_var.h>
#include <drizzled/item/null.h>
#include <drizzled/sql_parse.h>
#include <drizzled/session.h>
namespace drizzled
{
String *Item_func_get_user_var::val_str(String *str)
{
assert(fixed == 1);
if (!var_entry)
return((String*) 0); // No such variable
return(var_entry->val_str(&null_value, str, decimals));
}
double Item_func_get_user_var::val_real()
{
assert(fixed == 1);
if (!var_entry)
return 0.0; // No such variable
return (var_entry->val_real(&null_value));
}
my_decimal *Item_func_get_user_var::val_decimal(my_decimal *dec)
{
assert(fixed == 1);
if (!var_entry)
return 0;
return var_entry->val_decimal(&null_value, dec);
}
int64_t Item_func_get_user_var::val_int()
{
assert(fixed == 1);
if (!var_entry)
return 0L; // No such variable
return (var_entry->val_int(&null_value));
}
void Item_func_get_user_var::fix_length_and_dec()
{
maybe_null=1;
decimals=NOT_FIXED_DEC;
max_length=MAX_BLOB_WIDTH;
var_entry= session.getVariable(name, false);
/*
If the variable didn't exist it has been created as a STRING-type.
'var_entry' is NULL only if there occured an error during the call to
get_var_with_binlog.
*/
if (var_entry)
{
m_cached_result_type= var_entry->type;
unsigned_flag= var_entry->unsigned_flag;
max_length= var_entry->length;
collation.set(var_entry->collation);
switch(m_cached_result_type)
{
case REAL_RESULT:
max_length= DBL_DIG + 8;
break;
case INT_RESULT:
max_length= MAX_BIGINT_WIDTH;
decimals=0;
break;
case STRING_RESULT:
max_length= MAX_BLOB_WIDTH;
break;
case DECIMAL_RESULT:
max_length= DECIMAL_MAX_STR_LENGTH;
decimals= DECIMAL_MAX_SCALE;
break;
case ROW_RESULT: // Keep compiler happy
assert(0);
break;
}
}
else
{
collation.set(&my_charset_bin, DERIVATION_IMPLICIT);
null_value= 1;
m_cached_result_type= STRING_RESULT;
max_length= MAX_BLOB_WIDTH;
}
}
bool Item_func_get_user_var::const_item() const
{
return (!var_entry || session.getQueryId() != var_entry->update_query_id);
}
enum Item_result Item_func_get_user_var::result_type() const
{
return m_cached_result_type;
}
void Item_func_get_user_var::print(String *str,
enum_query_type )
{
str->append(STRING_WITH_LEN("(@"));
str->append(name.str,name.length);
str->append(')');
}
bool Item_func_get_user_var::eq(const Item *item,
bool ) const
{
/* Assume we don't have rtti */
if (this == item)
return 1; // Same item is same.
/* Check if other type is also a get_user_var() object */
if (item->type() != FUNC_ITEM ||
((Item_func*) item)->functype() != functype())
return 0;
Item_func_get_user_var *other=(Item_func_get_user_var*) item;
return (name.length == other->name.length &&
!memcmp(name.str, other->name.str, name.length));
}
} /* namespace drizzled */
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