mybatis的查询sql，参数为map

1.将参数封装到map集合中（用param.）

service层

String tableName = "userData";
Map<String,Object> params = new HashMap<>();
params.put("userId", userId);
params.put("name", name);
List<UserData> list = userDataMapper.listSelective(tableName, params);

mapper层

List<UserData> listSelective(
            @Param("tableName") String tableName,
            @Param("params") Map<String, Object> params);

xml中

 <select id="listSelective" resultMap="BaseResultMap">
        select
        <include refid="Base_Column_List" />
        from ${tableName} 
        <trim prefix="where" prefixOverrides="and|or">
            <if test="params.userId != null">
                user_id = #{params.userId,jdbcType=BIGINT}
            </if>
            <if test="params.name !=null and params.name !='' ">
                and name like concat("%",#{params.name, jdbcType=VARCHAR},"%")
            </if>
        </trim>
    </select>

1.传表名使用$
2.concat拼接字符串,mysql中concat 和 group_concat()的用法

2.将参数封装到map集合中(不用param.)

mapper层

List<CloanUserModel> listModel(Map<String, Object> params);

xml

<!-- 基本用户信息的sql查询条件公共引用 -->
    <sql id="searchBaseBy">
        <trim prefix="where" prefixOverrides="and|or">
            <if test="loginName !='' and loginName !=null">
                and u.login_name like concat("%",#{loginName,jdbcType=VARCHAR},"%")  
               </if>
            <if test="registTime !=null">
                and DATE_FORMAT(u.regist_time,'%Y-%m-%d') = #{registTime,jdbcType=TIMESTAMP}
            </if>
            <if test="startTime != null">
                and DATE_FORMAT(u.regist_time,'%Y-%m-%d') &gt;= #{startTime,jdbcType=TIMESTAMP}
            </if>
            <if test="endTime  != null">
                and DATE_FORMAT(u.regist_time,'%Y-%m-%d') &lt;= #{endTime,jdbcType=TIMESTAMP}
            </if>
        </trim>
    </sql>

  <select id="listModel" resultMap="BaseInfoModelMap" parameterType="java.util.HashMap">
        select u.id,u.login_name,a.real_name,
        (SELECT c.used FROM arc_credit c where c.consumer_no = u.id)  as used
        from cl_user u left join cl_user_base_info a on u.id = a.user_id
        LEFT JOIN cl_user_auth b ON a.user_id = b.user_id
        <include refid="searchBaseBy"/>
        order by u.id desc
    </select>

先暂时写这两种，至于foreach使用，日后补充，可以参考基于mysql对mybatis中的foreach进行深入研究