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/* Copyright (c) 2008 MySQL AB, 2009 Sun Microsystems, Inc.
Use is subject to license terms.
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 */
#ifndef SQL_SIGNAL_H
#define SQL_SIGNAL_H
/**
Signal_common represents the common properties of the SIGNAL and RESIGNAL
statements.
*/
class Signal_common : public Sql_statement
{
protected:
/**
Constructor.
@param lex the LEX structure for this statement.
@param cond the condition signaled if any, or NULL.
@param set collection of signal condition item assignments.
*/
Signal_common(LEX *lex,
const sp_cond_type_t *cond,
const Set_signal_information& set)
: Sql_statement(lex),
m_cond(cond),
m_set_signal_information(set)
{}
virtual ~Signal_common()
{}
/**
Assign the condition items 'MYSQL_ERRNO', 'level' and 'MESSAGE_TEXT'
default values of a condition.
@param cond the condition to update.
@param set_level_code true if 'level' and 'MYSQL_ERRNO' needs to be overwritten
@param level the level to assign
@param sqlcode the sql code to assign
*/
static void assign_defaults(MYSQL_ERROR *cond,
bool set_level_code,
MYSQL_ERROR::enum_warning_level level,
int sqlcode);
/**
Evaluate the condition items 'SQLSTATE', 'MYSQL_ERRNO', 'level' and 'MESSAGE_TEXT'
default values for this statement.
@param thd the current thread.
@param cond the condition to update.
*/
void eval_defaults(THD *thd, MYSQL_ERROR *cond);
/**
Evaluate each signal condition items for this statement.
@param thd the current thread.
@param cond the condition to update.
@return 0 on success.
*/
int eval_signal_informations(THD *thd, MYSQL_ERROR *cond);
/**
Raise a SQL condition.
@param thd the current thread.
@param cond the condition to raise.
@return false on success.
*/
bool raise_condition(THD *thd, MYSQL_ERROR *cond);
/**
The condition to signal or resignal.
This member is optional and can be NULL (RESIGNAL).
*/
const sp_cond_type_t *m_cond;
/**
Collection of 'SET item = value' assignments in the
SIGNAL/RESIGNAL statement.
*/
Set_signal_information m_set_signal_information;
};
/**
Signal_statement represents a SIGNAL statement.
*/
class Signal_statement : public Signal_common
{
public:
/**
Constructor, used to represent a SIGNAL statement.
@param lex the LEX structure for this statement.
@param cond the SQL condition to signal (required).
@param set the collection of signal informations to signal.
*/
Signal_statement(LEX *lex,
const sp_cond_type_t *cond,
const Set_signal_information& set)
: Signal_common(lex, cond, set)
{}
virtual ~Signal_statement()
{}
/**
Execute a SIGNAL statement at runtime.
@param thd the current thread.
@return false on success.
*/
virtual bool execute(THD *thd);
};
/**
Resignal_statement represents a RESIGNAL statement.
*/
class Resignal_statement : public Signal_common
{
public:
/**
Constructor, used to represent a RESIGNAL statement.
@param lex the LEX structure for this statement.
@param cond the SQL condition to resignal (optional, may be NULL).
@param set the collection of signal informations to resignal.
*/
Resignal_statement(LEX *lex,
const sp_cond_type_t *cond,
const Set_signal_information& set)
: Signal_common(lex, cond, set)
{}
virtual ~Resignal_statement()
{}
/**
Execute a RESIGNAL statement at runtime.
@param thd the current thread.
@return 0 on success.
*/
virtual bool execute(THD *thd);
};
#endif
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