JDBC 事物Transaction

//Test

import com.zhongxy.utils.JdbcUtils;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class TestTransaction {
    public static void main(String[] args) {
        Connection conn = null;
        PreparedStatement st = null;
        ResultSet rs = null;
        try {
            conn = JdbcUtils.getConnection();
            //关闭自动提交  也就是开启事物
            conn.setAutoCommit(false);

            String sql1 = "update users set price = price + 100 where id = 1";
            st = conn.prepareStatement(sql1);
            st.executeUpdate();

            String sql2 = "update users set price = price - 200 where id = 1";
            st = conn.prepareStatement(sql2);
            st.executeUpdate();

            conn.commit();//事物完毕，提交
            System.out.println("执行成功");
        } catch (SQLException e) {
            try {
                conn.rollback();
            } catch (SQLException e1) {
                e1.printStackTrace();
            }
            e.printStackTrace();
        }finally {
            JdbcUtils.release(conn,st,rs);
        }
    }
}

//Utils

public class JdbcUtils {
    private static String driver = null;
    private static String url = null;
    private static String username = null;
    private static String password = null;
    static {
        try{
            InputStream in = JdbcUtils.class.getClassLoader().getResourceAsStream("db.properties");
            Properties properties = new Properties();
            properties.load(in);
            driver = properties.getProperty("driver");
            url = properties.getProperty("url");
            username = properties.getProperty("username");
            password = properties.getProperty("password");

            //1.加载驱动
            Class.forName(driver);
        }catch (Exception e){
            e.printStackTrace();
        }
        
    }
    //获取连接
    public static Connection getConnection() throws SQLException {
         return DriverManager.getConnection(url,username,password);
    }
    //释放资源
    public  static void release(Connection conn, Statement st, ResultSet rs){
        if(rs!=null){
            try{
                rs.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        if(st!=null){
            try {
                st.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        if(conn!=null){
            try {
                conn.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }

    }

}