/**********************************************************************************
* $URL: https://source.sakaiproject.org/svn/rwiki/trunk/rwiki-impl/impl/src/java/uk/ac/cam/caret/sakai/rwiki/component/model/impl/SQLScriptMigration.java $
* $Id: SQLScriptMigration.java 76524 2010-04-23 16:55:28Z aaronz@vt.edu $
***********************************************************************************
*
* Copyright (c) 2003, 2004, 2005, 2006 The Sakai Foundation.
*
* Licensed under the Educational Community License, Version 1.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.opensource.org/licenses/ecl1.php
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
**********************************************************************************/
package uk.ac.cam.caret.sakai.rwiki.component.model.impl;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.sql.Connection;
import java.sql.SQLException;
import java.sql.Statement;
import java.text.MessageFormat;
import java.util.ArrayList;
import java.util.List;
import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.apache.commons.io.IOUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.sakaiproject.db.cover.SqlService;
import org.springframework.jdbc.support.JdbcUtils;
import org.springframework.orm.hibernate3.HibernateCallback;
import org.springframework.orm.hibernate3.HibernateTemplate;
import uk.ac.cam.caret.sakai.rwiki.service.api.model.DataMigrationAgent;
// FIXME: Component
public class SQLScriptMigration implements DataMigrationAgent
{
private static Log log = LogFactory.getLog(SQLScriptMigration.class);
private String from;
private String to;
private String scriptPattern;
private SessionFactory sessionFactory;
public String migrate(String current, String target, final boolean newdb) throws Exception
{
if ((current != null && from == null)
|| (current != null && !current.equals(from)))
{
log.info("Skipping Migration for " + from + " to " + to);
return current;
}
String targetScript = null;
String targetDialect = SqlService.getVendor();
if (targetDialect == null || targetDialect.length() == 0)
targetDialect = "hsqldb";
targetScript = MessageFormat.format(scriptPattern,
new Object[] { targetDialect });
// to matches
// perform the migration
log.info("Migrating database schema from " + from + " to " + to
+ " using " + targetScript);
InputStream inStream = getClass().getResourceAsStream(targetScript);
if (inStream == null)
{
log.warn("Migration Script " + targetScript + " was not found ");
return current;
}
InputStreamReader stream = null;
BufferedReader br = null;
try {
stream = new InputStreamReader(inStream); // validated as closing
br = new BufferedReader(stream); // validated as closing
String line = br.readLine();
StringBuffer currentLine = new StringBuffer();
List<String> lines = new ArrayList<String>();
while (line != null)
{
if (line.trim().endsWith(";"))
{
currentLine.append(line);
String sqlcmd = currentLine.toString().trim();
sqlcmd = sqlcmd.substring(0, sqlcmd.length() - 1);
if (sqlcmd != null && sqlcmd.length() > 0)
{
lines.add(sqlcmd);
}
currentLine = new StringBuffer();
}
else
{
currentLine.append(line);
}
line = br.readLine();
}
final String[] sql = (String[]) lines.toArray(new String[lines.size()]);
HibernateTemplate hibernateTemplate = new HibernateTemplate(
sessionFactory);
hibernateTemplate.setFlushMode(HibernateTemplate.FLUSH_NEVER);
hibernateTemplate.execute(new HibernateCallback()
{
public Object doInHibernate(Session session)
throws HibernateException, SQLException
{
Connection con = session.connection();
executeSchemaScript(con, sql, newdb);
return null;
}
});
return to;
}
finally {
IOUtils.closeQuietly(stream);
IOUtils.closeQuietly(br);
}
}
/**
* borrowed from LocalSessionFactoryBean in spring
*
* @param con
* @param sql
* @throws SQLException
*/
protected void executeSchemaScript(Connection con, String[] sql,boolean newdb)
throws SQLException
{
if (sql != null && sql.length > 0)
{
boolean oldAutoCommit = con.getAutoCommit();
if (!oldAutoCommit)
{
con.setAutoCommit(true);
}
try
{
Statement stmt = con.createStatement(); // validated as closing
try
{
for (int i = 0; i < sql.length; i++)
{
if (sql[i].startsWith("message"))
{
log.info("Data Migration " + sql[i]);
}
else
{
log.debug("Executing data migration statement: "
+ sql[i]);
try
{
long start = System.currentTimeMillis();
int l = stmt.executeUpdate(sql[i]);
log.debug(" Done " + l + " rows in "
+ (System.currentTimeMillis() - start)
+ " ms");
}
catch (SQLException ex)
{
if ( newdb )
{
log
.debug("Unsuccessful data migration statement: "
+ sql[i]);
log.debug("Cause: " + ex.getMessage());
}
else
{
log
.warn("Unsuccessful data migration statement: "
+ sql[i]);
log.debug("Cause: " + ex.getMessage());
}
}
}
}
}
finally
{
JdbcUtils.closeStatement(stmt);
}
}
finally
{
if (!oldAutoCommit)
{
con.setAutoCommit(false);
}
}
}
}
/**
* @return Returns the from.
*/
public String getFrom()
{
return from;
}
/**
* @param from
* The from to set.
*/
public void setFrom(String from)
{
this.from = from;
}
/**
* @return Returns the sessionFactory.
*/
public SessionFactory getSessionFactory()
{
return sessionFactory;
}
/**
* @param sessionFactory
* The sessionFactory to set.
*/
public void setSessionFactory(SessionFactory sessionFactory)
{
this.sessionFactory = sessionFactory;
}
/**
* @return Returns the to.
*/
public String getTo()
{
return to;
}
/**
* @param to
* The to to set.
*/
public void setTo(String to)
{
this.to = to;
}
/**
* @return Returns the scriptPattern.
*/
public String getScriptPattern()
{
return scriptPattern;
}
/**
* @param scriptPattern
* The scriptPattern to set.
*/
public void setScriptPattern(String scriptPattern)
{
this.scriptPattern = scriptPattern;
}
}