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：
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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
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<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，...）.
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select * from table where type=?and code in (?,?,?,?) |
Mapper.java文件
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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"
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<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服务器之家。
原文链接：https://blog.csdn.net/gaozhonghua12/article/details/90518961
