Mybatis查询条件包含List的情况说明

查询条件包含List的情况

在mybatis中进行搜索时，有时候参数中包含了List，比如传入参数：

public class FileRequest{
    //文件类型
    private Integer fileType;
    //状态
    private List<Status> statusList;
} 
public class Status{
    //注册状态
    private Integer registerStatus;
    //会议状态
    private Integer meetingStatus
}

在mybatis中查询的语句

<select id="findList" parameterType="FileRequest" resultMap="...">
    select * from tableName where
    1=1
    <if test="fileType != null ">
        and file_type = #{fileType}
    </if>
    <if test="statusList != null ">
        and 
        <foreach collection="statusList" index="index" item="item" open"(" separator="or" close=")">
            <if test="item.registerStatus != null ">
                and register_status= #{item.registerStatus}
            </if>
            <if test="item.meetingStatus != null ">
                and meeting_status= #{item.meetingStatus }
            </if>    
        </foreach>
    </if>
</select>

查询条件带List和其他类型字段

需求

Mybatis查询条件带List和其他类型字段（Integer，String，...）.

select * from table where type=?
and code in (?,?,?,?)

Mapper.java文件

List<BaseDictionary> selectByTypeAndCodes(
 @Param("codes") List<Integer> codes,
@Param("type") Integer type);
 Mapper.xml.

注意其中<foreach collection="codes"中的collection的值要和你定义的List别名@Param（“codes”）一致，

而不是只有一个list参数时的<foreach collection="list"

<select id="selectByTypeAndCodes"  resultMap="BaseResultMap">
    select
    <include refid="Base_Column_List" />
    from base_dictionary
    where type = #{type}
    AND code in
    <foreach collection="codes" index="index" item="item" open="(" separator="," close=")">
     #{item}
    </foreach>
    AND show_enable=1
    AND obj_status=1
    ORDER BY sort
  </select>

执行结果：

BaseJdbcLogger.debug(BaseJdbcLogger.java:145)==> Preparing: select id, type, name, code, sort, show_enable, obj_remark, obj_status, obj_createdate, obj_createuser, obj_modifydate, obj_modifyuser from base_dictionary where type = ? AND code in ( ? , ? , ? ) AND show_enable=1 AND obj_status=1 ORDER BY sort

BaseJdbcLogger.debug(BaseJdbcLogger.java:145)==> Parameters: 34(Integer), 1(Integer), 2(Integer), 3(Integer)

BaseJdbcLogger.debug(BaseJdbcLogger.java:145)<== Total: 2

以上为个人经验，希望能给大家一个参考，也希望大家多多支持猪先飞。