/*
* Copyright 1999-2015 dangdang.com.
* <p>
* Licensed 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.
* </p>
*/
package com.dangdang.ddframe.rdb.sharding.example.config.spring;
import com.dangdang.ddframe.rdb.sharding.config.yaml.api.YamlShardingDataSource;
import javax.sql.DataSource;
import java.io.File;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
public final class YamlWithDefaultDataSourceMain {
// CHECKSTYLE:OFF
public static void main(final String[] args) throws Exception {
// CHECKSTYLE:ON
YamlShardingDataSource dataSource = new YamlShardingDataSource(
new File(YamlWithDefaultDataSourceMain.class.getResource("/META-INF/withDefaultDataSource.yaml").getFile()));
printJoinSelect(dataSource);
printGroupBy(dataSource);
}
private static void printJoinSelect(final DataSource dataSource) throws SQLException {
String sql = "SELECT i.* FROM t_order o JOIN t_order_item i ON o.order_id=i.order_id WHERE o.user_id=? AND o.order_id=?";
try (
Connection conn = dataSource.getConnection();
PreparedStatement preparedStatement = conn.prepareStatement(sql)) {
preparedStatement.setInt(1, 10);
preparedStatement.setInt(2, 1001);
try (ResultSet rs = preparedStatement.executeQuery()) {
while (rs.next()) {
System.out.println(rs.getInt(1));
System.out.println(rs.getInt(2));
System.out.println(rs.getString(3));
}
}
}
}
private static void printGroupBy(final DataSource dataSource) throws SQLException {
String sql = "SELECT o.user_id, COUNT(*) FROM t_order o JOIN t_order_item i ON o.order_id=i.order_id GROUP BY o.user_id";
try (
Connection conn = dataSource.getConnection();
PreparedStatement preparedStatement = conn.prepareStatement(sql)) {
ResultSet rs = preparedStatement.executeQuery();
while (rs.next()) {
System.out.println("user_id: " + rs.getInt(1) + ", count: " + rs.getInt(2));
}
}
}
}