JDBCUtils_Use.java

package com.charlie.jdbc.utils;

import org.junit.Test;

import java.sql.*;

/**
 * 演示如何使用 JDBCUtils 工具类，完成dml和select
 */
public class JDBCUtils_Use {

    @Test
    public void testDML() { // insert, update, delete
        // 1. 得到连接
        Connection connection = null;
        // 2. 编写sql
        String sql = "update actor set name = ? where id = ?;";
//        String sql = "insert into actor values (null, ?, null, null, ?)";
        // 3. 创建 PreparedStatement 对象
        PreparedStatement preparedStatement = null;
        try {
            connection = JDBCUtils.getConnection();
            preparedStatement = connection.prepareStatement(sql);
            // 给占位符赋值
            preparedStatement.setString(1, "李达康");
            preparedStatement.setInt(2, 2);
            // 执行
            preparedStatement.executeUpdate();
        } catch (SQLException e) {
            throw new RuntimeException(e);
        } finally {
            // 关闭资源
            JDBCUtils.close(null, preparedStatement, connection);
        }
    }

    @Test
    public void testSelect() {
        Connection connection = null;
        PreparedStatement preparedStatement = null;
        ResultSet set = null;
        try {
            connection = JDBCUtils.getConnection();
            String sql = "select * from actor;";
            preparedStatement = connection.prepareStatement(sql);
            set = preparedStatement.executeQuery();
            while (set.next()) {
                int id = set.getInt("id");
                String name = set.getString("name");
                String gender = set.getString("gender");
                Date date = set.getDate("borndate");
                String phone = set.getString("phone");
                System.out.println(id + "\t" + name + "\t" + gender + "\t" + date + "\t" + phone);
            }
        } catch (SQLException e) {
            throw new RuntimeException(e);
        } finally {
            // 关闭资源
            JDBCUtils.close(set, preparedStatement, connection);
        }
    }
}