JDBC 考虑数据库事务的增删改

import org.junit.Test;
import util.JDBCUtils;

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

/**
 * @program: Connection
 * @description:
 * @author: Mr.Fan
 * @create: 2021-05-30 11:25
 **/
public class Transaction {
    @Test
    public void testUpdate() {
        Connection conn = null;
        try {
            conn = JDBCUtils.getConnection();

            //取消数据的自动提交
            conn.setAutoCommit(false);

            String sql1 = "update list2 set money = money - 100 where name = ?";
            update(conn, sql1, "AA");

            String sql2 = "update list2 set money = money + 100 where name = ?";
            update(conn, sql2, "BB");

            //提交数据
            conn.commit();

        } catch (Exception e) {
            e.printStackTrace();

            try {
                conn.rollback();
            } catch (SQLException throwables) {
                throwables.printStackTrace();
            }

        } finally {
			//再修改其为自动提交数据
            try {
                conn.setAutoCommit(true);
            } catch (SQLException throwables) {
                throwables.printStackTrace();
            }
            JDBCUtils.closeResource(conn,null);
        }
    }


    /**
     * 未考虑数据库事务的增删改操作
     * @param sql
     * @param args
     */
    public void update(String sql, Object ...args) {
        Connection conn = null;
        PreparedStatement ps = null;
        try {
            //1.获取数据库连接
            conn = JDBCUtils.getConnection();
            //2.预编译sql语句
            ps = conn.prepareStatement(sql);
            //3.填充占位符
            for (int i = 0; i < args.length; i++) {
                ps.setObject(i + 1, args[i]);
            }
            //4.执行
            ps.execute();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            JDBCUtils.closeResource(conn, ps);
        }
    }


    /**
     * 考虑数据库事务的增删改操作
     * @param sql
     * @param args
     */
    public void update(Connection conn, String sql, Object ...args) {

        PreparedStatement ps = null;
        try {

            //1.预编译sql语句
            ps = conn.prepareStatement(sql);
            //2.填充占位符
            for (int i = 0; i < args.length; i++) {
                ps.setObject(i + 1, args[i]);
            }
            //3.执行
            ps.execute();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            JDBCUtils.closeResource(null, ps);
        }
    }
}