zoukankan      html  css  js  c++  java
  • Mybatis学习笔记13

    示例代码:

    接口定义:
    package com.mybatis.dao;
    
    import com.mybatis.bean.Employee;
    
    public interface EmployeeMapper {
        public void updateEmp(Employee employee);
        public void updateEmployee(Employee employee);
    }
    
    
    mapper定义:
    <?xml version="1.0" encoding="UTF-8" ?>
    <!DOCTYPE mapper
            PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
            "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
    <mapper namespace="com.mybatis.dao.EmployeeMapper">
        <update id="updateEmp">
            update tbl_employee
            <set>
                <if test="lastName!=null">
                    last_name=#{lastName},
                </if>
                <if test="email!=null">
                    email=#{email},
                </if>
                <if test="gender!=null">
                    gender=#{gender}
                </if>
            </set>
            where id=#{id}
        </update>
    
        <update id="updateEmployee">
            update tbl_employee
            <trim prefix="set" suffixOverrides=",">
                <if test="lastName!=null">
                    last_name=#{lastName},
                </if>
                <if test="email!=null">
                    email=#{email},
                </if>
                <if test="gender!=null">
                    gender=#{gender}
                </if>
            </trim>
            where id=#{id}
        </update>
    </mapper>
    
    
    测试代码:
    package com.mybatis.demo;
    
    import com.mybatis.bean.Employee;
    import com.mybatis.dao.EmployeeMapper;
    import org.apache.ibatis.io.Resources;
    import org.apache.ibatis.session.SqlSession;
    import org.apache.ibatis.session.SqlSessionFactory;
    import org.apache.ibatis.session.SqlSessionFactoryBuilder;
    import org.junit.Test;
    
    import java.io.IOException;
    import java.io.InputStream;
    import java.util.List;
    
    public class MyTest {
        public SqlSessionFactory getSqlSessionFactory() throws IOException {
            String resource = "mybatis-config.xml";
            InputStream inputStream = Resources.getResourceAsStream(resource);
            return new SqlSessionFactoryBuilder().build(inputStream);
        }
    
        @Test
        public void test() throws IOException {
            SqlSessionFactory sqlSessionFactory = getSqlSessionFactory();
            SqlSession openSession = sqlSessionFactory.openSession(true);
            try {
                EmployeeMapper mapper = openSession.getMapper(EmployeeMapper.class);
                mapper.updateEmp(new Employee(1, "good", null, null));
                mapper.updateEmployee(new Employee(5, "test", null, null));
            } finally {
                openSession.close();
            }
        }
    }
    
  • 相关阅读:
    Pieczęć(模拟)
    【并查集】关押罪犯
    火车进栈
    独木舟上的旅行
    哈尔滨理工大学第八届程序设计团队赛K题
    [数学、递推]Everything Is Generated In Equal Probability
    [构造]triples I
    2019牛客第三场
    [DP]销售
    [哈夫曼树]猜球球
  • 原文地址:https://www.cnblogs.com/xidian2014/p/10351644.html
Copyright © 2011-2022 走看看