Java DataSource initDb(DataSource ds)

Description

Initialize the sample's database.

License

Apache License

Parameter

Parameter	Description
ds	the DataSource

Exception

Parameter	Description
Exception	an exception

Declaration

public static void initDb(DataSource ds) throws Exception 

Method Source Code

//package com.java2s;
/*/* www.ja v  a 2 s .c o m*/
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 java.sql.Connection;
import java.sql.SQLException;
import java.sql.Statement;

import javax.sql.DataSource;

public class Main {
    /**
     * Initialize the sample's database.
     * <p>
     * Tables are created as needed and purged.
     * @param ds the DataSource
     * @throws Exception
     */
    public static void initDb(DataSource ds) throws Exception {
        createTables(ds);
        purgeTables(ds);
    }

    private static void createTables(DataSource ds) throws Exception {
        try (Connection cn = ds.getConnection()) {
            Statement stmt = cn.createStatement();
            stmt.execute("CREATE TABLE persons " + "(" + "id INTEGER NOT NULL," + "firstname VARCHAR(40) NOT NULL,"
                    + "lastname VARCHAR(40) NOT NULL," + "PRIMARY KEY (id)" + ")");
        } catch (SQLException e) {
            if (e.getLocalizedMessage().contains("already exists"))
                return;
            else
                throw e;
        }
    }

    /**
     * Purge the sample's tables
     * @param ds the DataSource
     * @throws Exception
     */
    public static void purgeTables(DataSource ds) throws Exception {
        try (Connection cn = ds.getConnection()) {
            Statement stmt = cn.createStatement();
            stmt.execute("DELETE FROM persons");
        }
    }
}

Related

1. getTableColumnCount(DataSource dataSource, String selectedTable)
2. getTables(DataSource datasource)
3. hasTable(DataSource ds, String table)
4. initDataSource()
5. initDatasource(String jndiName)
6. initializeDataSource()
7. isDataSourceAvailable(String dataSourceName)
8. logQueryResultToFile(DataSource dataSource, String path, String sqlStatement, Object... boundVariables)
9. lookupDataSource(String dataSourceName)