Mybatis中 mappers配置

Posted 2023-04-30

参考技术A 在SqlMapConfig.xml文件中 <mappers>的配置有以下几种

注意：以下两种方法配置的是mapper接口路径。
要求mapper接口名称和mapper映射文件名称相同，且放在同一个目录中。

springboot配置mybatis的mapper路径

1、在src/main/resources/目录下新建mybatis文件夹，将xxx.xml文件放入该文件夹内

2、在application.yml文件中配置：

mybatis:

  configuration:

    mapUnderscoreToCamelCase: true

  mapperLocations: mybatis/*Mapper.xml

3、在Dao接口文件中加注解@Mapper，注意要将接口方法上的sql语句去掉

@Mapper
public interface MrInfoMapper
{
    /**
     * 根据条件查询MR信息
     * @param param
     * @return
     */
    public List<Map<String, Object>> findByCondition(Map<String, Object> param);
    /**
     * 获取页面展示数据
     * @param param
     * @return
     */
    // @Select("<script>" + "SELECT" + " group_concat(id) id," + " max(mi.mr) mr," + " mi.intf_file,"
    // + " max(mi.area) area," + " max(mi.rversion) rversion," + " concat("
    // + " ifnull(case when mi.ce=‘Y‘ then ‘CE ‘ end,‘‘),"
    // + " ifnull(case when mi.ne=‘Y‘ then ‘NE ‘ end,‘‘),"
    // + " ifnull(case when mi.ptn=‘Y‘ then ‘PTN ‘ end,‘‘),"
    // + " ifnull(case when mi.rtn=‘Y‘ then ‘RTN ‘ end,‘‘),"
    // + " ifnull(case when mi.trans=‘Y‘ then ‘TRANS ‘ end,‘‘)" + ") products,"
    // + " group_concat(distinct mi.change_type) change_type," + " max(mi.table_flag) table_flag" + " FROM "
    // + " tb_mr_info mi " + "WHERE" + " mi.intf_file IS NOT NULL" + " AND mi.table_flag = #{searchDate} "
    // + "<if test="productList != null ">" + "<foreach item="item" collection="productList" >"
    // + " and ${item}=‘Y‘" + "</foreach>" + "</if>" + "GROUP BY" + " mi.intf_file" + "</script>")
    public List<HashMap<String, String>> findDisplayData(Map<String, Object> param);

4、在xxxmapper.xml文件中写SQL，注意namesapce值不要写错。

<?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.huawei.nos.nosimsys.dao.MrInfoMapper">
<select id="findByCondition" parameterType="map" resultType="map">
    SELECT
        *
    FROM
        tb_mr_info tmi
    WHERE 1=1
    AND tmi.table_flag=#{searchDate}
    <if test="productList != null and productList != ‘‘">  
        <foreach collection="productList" item="item">
            and ${item}=‘Y‘
        </foreach>
    </if>
</select>