Mybatis查詢條件包含List的情況說明

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查詢條件包含List的情況

在mybatis中進行搜索時，有時候參數中包含瞭List，比如傳入參數：

public class FileRequest{
    //文件類型
    private Integer fileType;
    //狀態
    private List<Status> statusList;
} 
public class Status{
    //註冊狀態
    private Integer registerStatus;
    //會議狀態
    private Integer meetingStatus
}

在mybatis中查詢的語句

<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>

查詢條件帶List和其他類型字段

需求

Mybatis查詢條件帶List和其他類型字段（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.

註意其中<foreach collection=”codes”中的collection的值要和你定義的List別名@Param（“codes”）一致，

而不是隻有一個list參數時的<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>

執行結果：

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

以上為個人經驗，希望能給大傢一個參考，也希望大傢多多支持WalkonNet。

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