Mybatis动态SQL

本文主要是介绍Mybatis动态SQL，对大家解决编程问题具有一定的参考价值，需要的程序猿们随着小编来一起学习吧！

这里的where可以被优化为标签形式

<?xml version="1.0" encoding="UTF8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.tl.dao.BlogMapper">

    <insert id="addBlog" parameterType="com.tl.pojo.Blog">
    insert into blog(id,title,author,creat_time,views) values (#{id},#{title},#{author},#{creatTime},#{views})
    </insert>

    <select id="getBlog" parameterType="map" resultType="com.tl.pojo.Blog">
        select * from blog where 1=1
        <if test="title!=null">
            and title like #{title}
        </if>
    </select>
</mapper>

import com.tl.dao.BlogMapper;
import com.tl.pojo.Blog;
import com.tl.utils.IDutils;
import com.tl.utils.MybatisUtils;
import org.apache.ibatis.session.SqlSession;

import java.util.Date;
import java.util.HashMap;
import java.util.List;

/**
 * @author tl
 */
public class Test {
    @org.junit.Test
    public void test1(){
        SqlSession sqlSession = MybatisUtils.getSqlSession();
        BlogMapper mapper = sqlSession.getMapper(BlogMapper.class);
        int i=mapper.addBlog(new Blog(IDutils.getID(),"三天学完spring套餐","tl",new Date(),999999));
        System.out.println(i);
        sqlSession.commit();
        sqlSession.close();
    }
    @org.junit.Test
    public void test2(){
        SqlSession sqlSession = MybatisUtils.getSqlSession();
        BlogMapper mapper = sqlSession.getMapper(BlogMapper.class);
        HashMap map = new HashMap();
        map.put("title","一天学完java");
        List<Blog> list = mapper.getBlog(map);
        for(Blog blog:list){
            System.out.println(blog);
        }
        sqlSession.close();
    }
}

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