mybatis用注解替换xml,不再写.xml了

Paddy哥2024-07-09 10:36

复制代码

在Service里引用
    @Autowired
    private DemoMapper demoMapper;

下面展示一些 DemoMapper.java代码片。

复制代码

public interface DemoMapper{

 	/**
     * 查询页面信息-根据ID
     */
    @Select("select * from program where id = #{id}")
    Program getById(Long id);

    /**
     * 新增
     */
    @Insert({
            "<script> ",
            "  insert into program\n" +
                    "        <trim prefix=\"(\" suffix=\")\" suffixOverrides=\",\">\n" +
                    "            <if test=\"name != null and name != ''\">name,</if>\n" +
                    "            <if test=\"inDevId != null\">inDevId,</if>\n" +
                    "        </trim>\n" +
                    "        <trim prefix=\"values (\" suffix=\")\" suffixOverrides=\",\">\n" +
                    "            <if test=\"name != null and name != ''\">#{name},</if>\n" +
                    "            <if test=\"inDevId != null\">#{inDevId},</if>\n" +
                    "        </trim>",
            "</script>"
    })
    @Options(useGeneratedKeys = true, keyProperty = "id")
    int insert(Program program);


}

用<script>标签就可以写<if>这些标签哦

@Options(useGeneratedKeys = true, keyProperty = "id") 是返回最新自增主键id

其实就是用注解方式替换.xml写法，可考虑: 这个文章