mybatis版本

<dependency>
    <groupId>org.mybatis</groupId>
    <artifactId>mybatis</artifactId>
    <version>3.4.6</version>
</dependency>

動態SQL語句

IF標籤

<select id="findSelective" parameterType="com.tsing.model.Blog"
        resultMap
 
="BaseResultMap">
        SELECT * FROM blog 
            WHERE `status` = 1
            <if test="title != null and title != '' ">
                and title like #{title}
            </if>
            
            <if test="summary != null ">
                and summary like #{summary}
            
 
</if>
</select>

@Test
    public void testFindSelective() {
        SqlSessionFactory factory = DataBaseTools.getSqlSessionFactory();

        SqlSession session = factory.openSession(true);
        BlogMapper mapper = session.getMapper(BlogMapper.class);
        
        Blog blog 
 
= new Blog();
        blog.setTitle("");
        blog.setSummary("");
        mapper.findSelective(blog) ;

    }

日誌輸出

==>  Preparing: SELECT * FROM blog WHERE `status` = 1 and summary like ? 

==> Parameters: (String)