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MySQL JDBC Type 4 driver
/*
Copyright (c) 2007, 2020, Oracle and/or its affiliates. All rights reserved.
The MySQL Connector/J is licensed under the terms of the GPLv2
, like most MySQL Connectors.
There are special exceptions to the terms and conditions of the GPLv2 as it is applied to
this software, see the FOSS License Exception
.
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
*/
package com.mysql.jdbc.interceptors;
import java.sql.SQLException;
import java.util.HashMap;
import java.util.Map;
import java.util.Properties;
import com.mysql.jdbc.Connection;
import com.mysql.jdbc.ResultSetInternalMethods;
import com.mysql.jdbc.Statement;
import com.mysql.jdbc.StatementInterceptor;
import com.mysql.jdbc.Util;
public class ServerStatusDiffInterceptor implements StatementInterceptor {
private Map preExecuteValues = new HashMap();
private Map postExecuteValues = new HashMap();
public void init(Connection conn, Properties props) throws SQLException {
}
public ResultSetInternalMethods postProcess(String sql, Statement interceptedStatement, ResultSetInternalMethods originalResultSet, Connection connection)
throws SQLException {
if (connection.versionMeetsMinimum(5, 0, 2)) {
populateMapWithSessionStatusValues(connection, this.postExecuteValues);
connection.getLog().logInfo("Server status change for statement:\n" + Util.calculateDifferences(this.preExecuteValues, this.postExecuteValues));
}
return null; // we don't actually modify a result set
}
private void populateMapWithSessionStatusValues(Connection connection, Map toPopulate) throws SQLException {
java.sql.Statement stmt = null;
java.sql.ResultSet rs = null;
try {
toPopulate.clear();
stmt = connection.createStatement();
rs = stmt.executeQuery("SHOW SESSION STATUS");
while (rs.next()) {
toPopulate.put(rs.getString(1), rs.getString(2));
}
} finally {
if (rs != null) {
rs.close();
}
if (stmt != null) {
stmt.close();
}
}
}
public ResultSetInternalMethods preProcess(String sql, Statement interceptedStatement, Connection connection) throws SQLException {
if (connection.versionMeetsMinimum(5, 0, 2)) {
populateMapWithSessionStatusValues(connection, this.preExecuteValues);
}
return null; // we don't actually modify a result set
}
public boolean executeTopLevelOnly() {
return true;
}
public void destroy() {
}
}