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/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
*
* Copyright (C) 2009 Sun Microsystems
*
* Authors:
*
* Jay Pipes <joinfu@sun.com>
*
* 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
*/
/**
* @file
*
* Implementation of various routines that can be used to convert
* Command messages to other formats, including SQL statements.
*/
#include "drizzled/message/command_transform.h"
#include "drizzled/message/replication.pb.h"
#include <string>
#include <bitset>
namespace drizzled
{
namespace message
{
void transformCommand2Sql(const Command &source,
std::string *destination,
enum CommandTransformSqlVariant sql_variant)
{
char quoted_identifier= '`';
if (sql_variant == ANSI)
quoted_identifier= '"';
switch (source.type())
{
case Command::START_TRANSACTION:
destination->assign("START TRANSACTION");
break;
case Command::COMMIT:
destination->assign("COMMIT");
break;
case Command::ROLLBACK:
destination->assign("ROLLBACK");
break;
case Command::INSERT:
{
destination->assign("INSERT INTO ");
destination->push_back(quoted_identifier);
destination->append(source.schema());
destination->push_back(quoted_identifier);
destination->push_back('.');
destination->push_back(quoted_identifier);
destination->append(source.table());
destination->push_back(quoted_identifier);
destination->append(" (");
const message::InsertRecord &record= source.insert_record();
int32_t num_fields= record.insert_field_size();
int32_t x;
for (x= 0; x < num_fields; x++)
{
if (x != 0)
destination->push_back(',');
const message::Table::Field f= record.insert_field(x);
destination->push_back(quoted_identifier);
destination->append(f.name());
destination->push_back(quoted_identifier);
}
destination->append(") VALUES ");
/*
* There may be an INSERT VALUES (),() type statement. We know the
* number of records is equal to the field_values array size divided
* by the number of fields.
*
* So, we do an inner and an outer loop. Outer loop is on the number
* of records and the inner loop on the number of fields. In this way,
* we know that record.field_values(outer_loop * num_fields) + inner_loop))
* always gives us our correct field value.
*/
int32_t num_records= (record.insert_value_size() / num_fields);
int32_t y;
for (x= 0; x < num_records; x++)
{
if (x != 0)
destination->push_back(',');
destination->push_back('(');
for (y= 0; y < num_fields; y++)
{
if (y != 0)
destination->push_back(',');
destination->push_back('\'');
destination->append(record.insert_value((x * num_fields) + y));
destination->push_back('\'');
}
destination->push_back(')');
}
}
break;
case Command::UPDATE:
{
const message::UpdateRecord &record= source.update_record();
int32_t num_update_fields= record.update_field_size();
int32_t x;
destination->assign("UPDATE ");
destination->push_back(quoted_identifier);
destination->append(source.schema());
destination->push_back(quoted_identifier);
destination->push_back('.');
destination->push_back(quoted_identifier);
destination->append(source.table());
destination->push_back(quoted_identifier);
destination->append(" SET ");
for (x= 0;x < num_update_fields; x++)
{
Table::Field f= record.update_field(x);
if (x != 0)
destination->push_back(',');
destination->push_back(quoted_identifier);
destination->append(f.name());
destination->push_back(quoted_identifier);
destination->append("='");
destination->append(record.after_value(x));
destination->push_back('\'');
}
int32_t num_where_fields= record.where_field_size();
/*
* Make sure we catch anywhere we're not aligning the fields with
* the field_values arrays...
*/
assert(num_where_fields == record.where_value_size());
destination->append(" WHERE ");
for (x= 0;x < num_where_fields; x++)
{
if (x != 0)
destination->append(" AND "); /* Always AND condition with a multi-column PK */
const Table::Field f= record.where_field(x);
/* Always equality conditions */
destination->push_back(quoted_identifier);
destination->append(f.name());
destination->push_back(quoted_identifier);
destination->append("='");
destination->append(record.where_value(x));
destination->push_back('\'');
}
}
break;
case Command::DELETE:
{
const message::DeleteRecord &record= source.delete_record();
int32_t num_where_fields= record.where_field_size();
int32_t x;
destination->assign("DELETE FROM ");
destination->push_back(quoted_identifier);
destination->append(source.schema());
destination->push_back(quoted_identifier);
destination->push_back('.');
destination->push_back(quoted_identifier);
destination->append(source.table());
destination->push_back(quoted_identifier);
destination->append(" WHERE ");
for (x= 0; x < num_where_fields; x++)
{
if (x != 0)
destination->append(" AND "); /* Always AND condition with a multi-column PK */
const Table::Field f= record.where_field(x);
/* Always equality conditions */
destination->push_back(quoted_identifier);
destination->append(f.name());
destination->push_back(quoted_identifier);
destination->append(" = '");
destination->append(record.where_value(x));
destination->push_back('\'');
}
}
break;
case Command::RAW_SQL:
destination->assign(source.sql());
break;
}
}
} /* end namespace drizzled::message */
} /* end namespace drizzled */
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