package JDBC.demo04;

import JDBC.Login.JDBCUtils;

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

/**
 * JDBC事务管理机制
 */
public class JDBCCommit {

    public static void main(String[] args) {
        Connection conn = null;
        PreparedStatement pstmt1 = null;
        PreparedStatement pstmt2 = null;
        try {
            conn = JDBCUtils.getConn();
            String sql1 = "update account set counts = counts - ? where id = ?";
            String sql2 = "update account set counts = counts + ? where id = ?";
            conn.setAutoCommit(false);
            pstmt1 = conn.prepareStatement(sql1);
            pstmt2 = conn.prepareStatement(sql2);
            pstmt1.setInt(1, 10000);
            pstmt1.setInt(2, 1);
            pstmt2.setInt(1, 10000);
            pstmt2.setInt(2, 2);
            pstmt1.executeUpdate();
            int i = 1 / 0;
            pstmt2.executeUpdate();
            conn.commit();
        } catch (Exception e) {
            try {
                if (conn != null) {
                    conn.rollback();
                }
            } catch (SQLException ex) {
                ex.printStackTrace();
            }
            e.printStackTrace();
        } finally {
            JDBCUtils.colse(conn, pstmt1, null);
            JDBCUtils.colse(null, pstmt2, null);
        }
    }
}