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package org.apache.velocity.test.sql;
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
*
* 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.
*/
import org.apache.commons.lang3.StringUtils;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.Statement;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class DBHelper
{
private String driverClass = null;
private Connection connection = null;
public DBHelper(String driverClass, String uri, String login, String password, String loadFile) throws Exception
{
this.driverClass = driverClass;
Class.forName(driverClass);
this.connection = DriverManager.getConnection(uri, login, password);
if (StringUtils.isNotEmpty(loadFile))
{
loadSqlFile(loadFile);
}
}
public Connection getConnection()
{
return connection;
}
public void close()
{
try
{
connection.close();
}
catch (Exception e)
{
System.out.println("While closing Connection" + e.getMessage());
}
}
// avoid ';' inside BEGIN/END blocks
private static int nextSemiColon(final String cmd)
{
int start = 0;
int ret = -1;
while (true)
{
ret = cmd.indexOf(';', start);
if (ret == -1) break;
int begin = cmd.lastIndexOf("BEGIN", ret);
int end = cmd.lastIndexOf("END;", ret);
if (begin == -1) break;
if (end > begin) break;
start = ret + 1;
}
return ret;
}
private void loadSqlFile(String fileName) throws Exception
{
Statement statement = null;
try
{
String commands = new String(Files.readAllBytes(Paths.get(fileName)), StandardCharsets.UTF_8);
// manually eat comments, some engines don't like them
Pattern removeComments = Pattern.compile("^--.*$", Pattern.MULTILINE);
Matcher matcher = removeComments.matcher(commands);
commands = matcher.replaceAll("");
for (int targetPos = nextSemiColon(commands); targetPos > -1; targetPos = nextSemiColon(commands))
{
statement = connection.createStatement();
String cmd = commands.substring(0, targetPos + 1);
// Oracle doesn't like semi-colons at the end, except for BEGIN/END blocks...
// nor does Derby
if (driverClass.equals("oracle.jdbc.OracleDriver") && !cmd.endsWith("END;") ||
driverClass.equals("org.apache.derby.jdbc.EmbeddedDriver"))
{
cmd = cmd.substring(0, cmd.length() - 1);
}
statement.executeUpdate(cmd);
commands = commands.substring(targetPos + 2);
statement.close();
}
}
finally
{
if (statement != null)
{
statement.close();
}
}
}
}
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