<select id="selectOuNameByUserIdsAndUserNames" resultMap="DomainUserRelationMapper"> SELECT ou_name FROM domain_user_relation m JOIN user_pool p ON m.user_id = p.user_id AND m.user_name = p.user_name WHERE (m.user_id, m.user_name) IN <foreach item="item" collection="userList" separator="," open="(" close=")"> #{item.userId}, #{item.userName} </foreach> </select> 查询返回的是String数组吗

MyBatis_3_User_Guide.zip_mybatis_mybatis api

这份"MyBatis_3_User_Guide.zip"压缩包内包含的"MyBatis_3_User_Guide.pdf"文档，是MyBatis 3的用户指南，它全面解析了MyBatis框架的核心功能和使用方法。以下是一些主要知识点的详细说明： 1. **配置文件**：...

iBATIS-DAO-2.3.4.726.rar_com.ibatis.dao_iBATIS dao 2_iBatis DAO_

此外，iBATIS还提供了一些辅助工具，如ParameterMap用于管理SQL语句的输入参数，ResultMap用于处理查询结果的映射，以及Cache机制，用于缓存查询结果，提高系统性能。这些工具类使得开发者能够更方便地进行...

根据下面的配置信息，写出Classes，Teacher和Student这三个POJO的全部代码。<mapper namespace="com.lcb.mapping.userMapper"> <l--association—对—关联查询--> <select id="getClass" parameterType="int" resultMap="ClassesResultMap">select * from class c,teacher t where c.teacher_id=t.t_id and c.c_id=#{id} <select> <resultMap type="com.lcb.user.Classes" id="ClassesResultMap"><l--实体类的字段名和数据表的字段名映射--> <id property="id" column="c_id"/> <result property="name" column="c_name"/><association property="teacher" javaType="com.Icb.user.Teacher"><id property="id" column="t_id" l> <result property="name" column="t_name"/></association> </resultMap> <l--collection—对多关联查询--> <select id="getClass2" parameterType="int"resultMap="ClassesResultMap2"> select * from class c,teacher t,student s where c.teacher_id=t.t_idand c.c_id=s.class_id and c.c_id=#{ id} <select> <resultMap type="com.lcb.user.Classes" id="ClassesResultMap2"><id property=""id" column="c_id"/> <result property="name" column="c_name"/><association property="teacher" javaType="com.Icb.user.Teacher"><id property="id" column="t_id"l> <result property="name" column="t_name"/></association> <collection property="student" ofType="com.Icb.user.Student"><id property="id" column="s_id"/> cresult property="name" column="s_name"/></collection> </resultMap></mapper>

private int id; private int teacherId; private String name; private Teacher teacher; //Getter and Setter } Teacher POJO代码： public class Teacher { private int id; private String name; ...

<select id="getProductByStatusWhenCalculatePage" resultMap="productResultMap"> SELECT p.id, p.user_id, p.goods_name, GROUP_CONCAT(i.url SEPARATOR ',') AS images FROM pms_product AS p LEFT JOIN pms_product_images AS i ON p.id = i.product_id WHERE p.status = #{status} GROUP BY p.id </select> <resultMap id="productResultMap" type="Product"> <id property="id" column="id"/> <result property="userId" column="user_id"/> <result property="goodsName" column="goods_name"/> <collection property="images" ofType="java.lang.String"> <result column="images" /> </collection> </resultMap> resulttype用Map实现，不要使用vo类或实体类

SELECT p.id, p.user_id, p.goods_name, GROUP_CONCAT(i.url SEPARATOR ',') AS images FROM pms_product AS p LEFT JOIN pms_product_images AS i ON p.id = i.product_id WHERE p.status = #{status} GROUP ...

<?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.example.teacher_admin_system.mappers.EvaluationMapper"> <resultMap id="EvaluationResult" type="com.example.teacher_admin_system.pojo.Evaluation"> <result column="name" property="name"></result> <result column="avg(score)" property="avg"></result> </resultMap> <select id="findAll" resultMap="EvaluationResult"> select name,avg(score) from evaluation join teacher on evaluation.teacher_id=teacher.id group BY teacher_id </select> <select id="findById" resultMap="EvaluationResult"> select teacher.name,avg(score) from evaluation join teacher on evaluation.teacher_id=teacher.id group BY teacher_id HAVING teacher_id = #{id};</select> <select id="findByName" resultMap="EvaluationResult"> select teacher.name,avg(score) from evaluation join teacher on evaluation.teacher_id=teacher.id join department on department.id=teacher.department_id where department.name='???????' group BY teacher_id; </select> </mapper>

这是一个 MyBatis 的 Mapper 文件，它定义了一个名为 "com.example.teacher_admin_system.mappers.EvaluationMapper" 的命名空间，其中包含三个 SQL 查询语句。第一个查询语句是 "findAll"，它使用了一个 ...

<select id="selectProject" parameterType="project" resultMap="BaseResultMap"> select * from project <where> <if test="pName != null and pName != ''"> and p_name like concat('%', #{pName}, '%')</if> <if test="pManager != null and pManager != ''"> and p_manager = #{pManager}</if> <if test="pPeople != null and pPeople != ''"> and p_people = #{pPeople}</if> <if test="pImg != null and pImg != ''"> and p_img = #{pImg}</if> <if test="pDescribe != null and pDescribe != ''"> and p_describe = #{pDescribe}</if> <if test="pTasks != null "> and p_tasks = #{pTasks}</if> <if test="pTasksplan != null "> and p_tasksplan = #{pTasksplan}</if> <if test="pTasksre != null">and p_tasksre = #{pTasksre}</if> <if test="pPlanprogress != null "> and p_planprogress = #{pPlanprogress}</if> <if test="pProgress != null "> and p_progress = #{pProgress}</if> <if test="pStatus != null "> and p_status = #{pStatus}</if> </where> </select>

根据您提供的代码，您的查询语句看起来没有问题。但是，我注意到您在查询语句中使用了 parameterType="project"，这意味着您的查询方法应该接受一个 Project 对象作为参数。由于您的查询结果为 null，有可能是传递给...

<?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.phonemarket.mapper.BannerMapper"> <resultMap type="Banner" id="BaseResultMap"> <id property="bannerId" column="banner_id" /> <result property="bannerName" column="banner_name" /> <result property="bannerUrl" column="banner_url" /> <result property="bannerImg" column="banner_img" /> <result property="bannerState" column="banner_state" /> </resultMap> <insert id="addBanner" parameterType="Banner"> insert into banner(banner_name,banner_url,banner_img) values(#{bannerName},#{bannerUrl},#{bannerImg}) </insert> <update id="deleteBanner" parameterType="java.lang.Integer"> update banner set banner_state=-1 where banner_id=#{id} </update> <update id="changeBannerState" parameterType="java.lang.Integer"> update banner set banner_state=#{0} where banner_id=#{1} </update> <update id="updateBanner" parameterType="Banner"> update banner <set> <if test="bannerName!=null"> banner_name=#{bannerName}, </if> <if test="bannerUrl!=null"> banner_url=#{bannerUrl}, </if> <if test="bannerImg!=null"> banner_img=#{bannerImg} </if> </set> where banner_id=#{bannerId} </update> <select id="findBannerById" parameterType="java.lang.Integer" resultMap="BaseResultMap"> select * from banner where banner_id=#{id} </select> <select id="findAllBanner" resultMap="BaseResultMap"> select * from banner where banner_state > 0 </select> <select id="findAllBannerByLikeName" parameterType="java.lang.String" resultMap="BaseResultMap"> select * from banner where banner_state > 0 and banner_name like '%${value}%' </select> <select id="findAllShowBanner" resultMap="BaseResultMap"> select * from banner where banner_state=1 </select> </mapper>

括号中的参数类型表示 SQL 语句中的参数类型，resultMap 定义了查询结果与 Banner 对象之间的映射关系。其中BaseResultMap是一个标识符，表示基本的结果映射，对应了Banner类中的属性名称。在 SQL 语句中，#{param} ...

<select id="findAdverts" resultMap="advertMap"> SELECT a.*, p.id AS position_id, p.name AS position_name, m.id AS media_id, m.file_name, m.file_type, m.file_url FROM advert a LEFT JOIN ad_position p ON a.position_id = p.id LEFT JOIN media_file m ON a.media_id = m.id WHERE (id = :id OR :id IS NULL) </select>和<resultMap id="advertMap" type="com.ruifan.taihaolian.biz.model.dto.AdvertDTO"> <id property="id" column="id"/> <result property="name" column="name"/> <association property="adPosition" javaType="com.ruifan.taihaolian.biz.model.AdPosition"> <id property="id" column="position_id"/> <result property="name" column="position_name"/> </association> <association property="mediaFile" javaType="com.ruifan.taihaolian.biz.model.MediaFile"> <id property="id" column="id"/> <result property="fileName" column="name"/> <result property="fileType" column="type"/> <result property="fileUrl" column="url"/> </association> </resultMap>对吗？

结果映射定义了 AdvertDTO、AdPosition 和 MediaFile 三个类之间的关系，其中 AdvertDTO 包含了 id、name、adPosition 和 mediaFile 四个属性，分别对应 advert 表的 id 和 name 字段，ad_position 表的 id 和 name ...

<?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.de.debook.mapper.CategoryMapper"> <resultMap id="BaseResultMap" type="com.de.debook.entity.Category"> <id column="id" jdbcType="INTEGER" property="id"/> <result column="name" jdbcType="VARCHAR" property="name"/> </resultMap> <resultMap id="StatisticsResultMap" type="com.de.debook.entity.Statistics"> <result column="name" jdbcType="VARCHAR" property="name"/> <result column="value" jdbcType="VARCHAR" property="value"/> </resultMap> <sql id="Base_Column_List"> id, name </sql> <select id="selectByPrimaryKey" parameterType="java.lang.Integer" resultMap="BaseResultMap"> select <include refid="Base_Column_List"/> from category where id = #{id,jdbcType=INTEGER} </select> <delete id="deleteByPrimaryKey" parameterType="java.lang.Integer"> delete from category where id = #{id,jdbcType=INTEGER} </delete> <insert id="insert" parameterType="com.de.debook.entity.Category"> insert into category (id, name) values (#{id,jdbcType=INTEGER}, #{name,jdbcType=VARCHAR}) </insert> <insert id="insertSelective" parameterType="com.de.debook.entity.Category"> insert into category <trim prefix="(" suffix=")" suffixOverrides=","> <if test="id != null"> id, </if> <if test="name != null"> name, </if> </trim> <trim prefix="values (" suffix=")" suffixOverrides=","> <if test="id != null"> #{id,jdbcType=INTEGER}, </if> <if test="name != null"> #{name,jdbcType=VARCHAR}, </if> </trim> </insert> <update id="updateByPrimaryKeySelective" parameterType="com.de.debook.entity.Category"> update category <set> <if test="name != null"> name = #{name,jdbcType=VARCHAR}, </if> </set> where id = #{id,jdbcType=INTEGER} </update> <update id="updateByPrimaryKey" parameterType="com.de.debook.entity.Category"> update category set name = #{name,jdbcType=VARCHAR} where id = #{id,jdbcType=INTEGER} </update> <select id="selectAll" resultMap="BaseResultMap"> select <include refid="Base_Column_List"/> from category order by id asc </select> <select id="selectStatistics" resultMap="StatisticsResultMap"> SELECT t1.name as name, COUNT(*) as value FROM category t1, debook t2 WHERE t1.id = t2.category_id GROUP BY t1.id order by t1.id asc </select> </mapper>

这是一个 MyBatis 的 Mapper 文件，用于映射实体...还定义了两个结果映射 resultMap，用于将查询结果映射到实体类或自定义的统计类 Statistics 中。最后还定义了两个 select 语句，用于查询所有分类和分类的统计信息。

<mapper namespace="com.kangxg.mapper.UserMapper"> <select id="findUserWithOrders" parameterType = "Integer" resultMap="UserWithOrdersResult"> select u.*,o.id as orders_id,o.number from tb_user u,tb_orders o where u.id = o.user_id and u.id = #{id} </select> <resultMap type="com.kangxg.po.User" id="UserWithOrdersResult"> <id property = "id" column = "id"/> <result property = "username" column = "username"/> <result property = "address" column = "address"/> <collection property = "com.kangxg.po.ordersList" ofType = "Orders"> <id property ="id" column ="orders_id"/> <result property ="number" column = "number"/> </collection> </resultMap> </mapper> 对以上代码进行优化改错

<select id="findUserWithOrders" parameterType="Integer" resultMap="UserWithOrdersResult"> SELECT u.*, o.id AS orders_id, o.number FROM tb_user u, tb_orders o WHERE u.id = o.user_id AND u.id = #{...

前端传来的搜索条件 1. pageNum: 1 2. pageSize: 20 3. schoolId: 12 4. clockTime_begin: 2023-08-02 5. clockTime_end: 2023-08-03 <select id="selectAttStudentRecordList" parameterType="AttStudentRecord" resultMap="AttStudentRecordResult"> <include refid="selectAttStudentRecordVo"/> <where> <if test="schoolId != null "> and school_id = #{schoolId}</if> <if test="parentId != null "> and parent_id = #{parentId}</if> <if test="studentId != null "> and student_id = #{studentId}</if> <if test="stuName != null and stuName != ''"> and stu_name like concat('%', #{stuName}, '%')</if> <if test="stuNo != null and stuNo != ''"> and stu_no = #{stuNo}</if> <if test="cardNo != null and cardNo != ''"> and card_no = #{cardNo}</if> <if test="clockType != null "> and clock_type = #{clockType}</if> <if test="imgUrl != null and imgUrl != ''"> and img_url = #{imgUrl}</if> <if test="clock_time != null" > and clock_time =#{clockTime}</if> <if test="channelName != null and channelName != ''"> and channel_name like concat('%', #{channelName}, '%')</if> <if test="deviceId != null "> and device_id = #{deviceId}</if> <if test="tenantId != null "> and tenant_id = #{tenantId}</if> and del_flag = 0 </where> </select> 我在xml文件中的where要怎么写

<select id="selectAttStudentRecordList" parameterType="AttStudentRecord" resultMap="AttStudentRecordResult"> <include refid="selectAttStudentRecordVo" /> <where> <if test="schoolId != null ">and ...

<?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.ruifan.taihaolian.biz.mapper.AdvertMapper"><resultMap id="BaseResultMap" type="com.ruifan.taihaolian.biz.model.Advert"><id column="id" jdbcType="INTEGER" property="id" /><result column="name" jdbcType="VARCHAR" property="name" /><result column="position_id" jdbcType="INTEGER" property="positionId" /><result column="media_id" jdbcType="INTEGER" property="mediaId" /><result column="start_date" jdbcType="TIMESTAMP" property="startDate" /><result column="end_date" jdbcType="TIMESTAMP" property="endDate" /><result column="link" jdbcType="VARCHAR" property="link" /><result column="status" jdbcType="INTEGER" property="status" /><result column="create_time" jdbcType="TIMESTAMP" property="createTime" /><result column="update_time" jdbcType="TIMESTAMP" property="updateTime" /></resultMap><select id="findAdverts" resultMap="advertMap">SELECT a.*, p.id AS position_id, p.name AS position_name, m.id AS media_id, m.file_name, m.file_type, m.file_url FROM advert a LEFT JOIN ad_position p ON a.position_id = p.id LEFT JOIN media_file m ON a.media_id = m.id WHERE (id = :id OR :id IS NULL) </select> <resultMap id="advertMap" type="com.ruifan.taihaolian.biz.model.dto.AdvertDTO"><id property="id" column="id"/><result property="name" column="name"/><association property="adPosition" javaType="com.ruifan.taihaolian.biz.model.AdPosition"><id property="id" column="position_id"/><result property="name" column="position_name"/></association><association property="mediaFile" javaType="com.ruifan.taihaolian.biz.model.MediaFile"><id property="id" column="id"/><result property="fileName" column="name"/><result property="fileType" column="type"/><result property="fileUrl" column="url"/></association></resultMap></mapper>请指正错误

这段代码是 MyBatis 的 XML 配置文件，其中定义了一个名为 AdvertMapper 的 Mapper 接口...另外，该查询语句中使用了 LEFT JOIN 连接，需要注意当 a.position_id 或 a.media_id 为 NULL 时，可能会导致查询结果不准确。

请阅读以下代码：<?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.example.demo.mapper.UserMapper"> <resultMap id="userMap" type="com.example.demo.model.User"> <id property="id" column="id" /> <result property="name" column="name" /> <result property="email" column="email" /> </resultMap> <select id="findAll" resultMap="userMap"> SELECT * FROM user </select> <select id="findById" resultMap="userMap"> SELECT * FROM user WHERE id = #{id} </select> <insert id="save"> INSERT INTO user(name, email) VALUES (#{name}, #{email}) </insert> <update id="update"> UPDATE user SET name=#{name}, email=#{email} WHERE id=#{id} </update> <delete id="delete"> DELETE FROM user WHERE id=#{id} </delete> <configuration> org.hibernate.dialect.MySQLDialect </configuration> </mapper> 如果我使用的不是hibernate框架，应当怎么修改？

<select id="findAll" resultMap="userMap"> SELECT * FROM user </select> <select id="findById" resultMap="userMap"> SELECT * FROM user WHERE id = #{id} </select> <insert id="save"> INSERT INTO ...

<select id="loadArticleList" resultMap="resultMap"> SELECT aa.* FROM ap_article aa LEFT JOIN ap_article_config aac ON aa.id = aac.article_id <where> and aac.is_delete != 1 and aac.is_down != 1 <if test="type != null and type == 1"> and aa.publish_time <![CDATA[<]]> #{dto.minBehotTime} </if> <if test="type != null and type == 2"> and aa.publish_time <![CDATA[>]]> #{dto.maxBehotTime} </if> <if test="dto.tag != 'all'"> and aa.channel_id = #{dto.tag} </if> </where> order by aa.publish_time desc limit #{dto.size} </select>

4. <if>语句块中的条件根据dto.tag的值来筛选特定标签的文章，如果dto.tag不等于'__all__'，则只选择对应标签的文章。查询结果按照发布时间(aa.publish_time)倒序排序，并限制返回结果数量为dto.size。 ...

修正下列xml代码<?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.nxu.dao.blogMapper"> . <select id="findAuthorByBlogId" resultMap="authorResultMap"> select a.author_id,a.author_username,a.author_password,a.author_email,b.blog_id,b.blog_title,b.blog_author_id from author a, blog b where b.blog_id = #{blogId} and a.author_id = b.blog_author_id </select> <resultMap id="authorResultMap" type="Blog"> <id property="blogId" column="blog_id"/> <result property="blogTitle" column="blog_title"/> <association property="author" javaType="Author"> <id property="authorId" column="author_id"/> <result property="authorUsername" column="author_username"/> <result property="authorPassword" column="author_password"/> <result property="authorEmail" column="author_email"/> </association> </resultMap> </mapper>

3. resultMap属性值必须与resultMap标签的id属性值一致； 4. Blog类需要有对应的属性和getter/setter方法，否则会报错； 5. authorResultMap中的association标签用于关联查询，需要在Blog类中定义一个Author类型的...

<select id="selectAll" resultMap="tblTicketCardDistributionMap"> select * from TBL_TICKET_CARD_DISTRIBUTION <where> <choose> <when test="query.orderType != null and query.orderType != '' and query.orderType =='03'"> and ORDER_TYPE = #{query.orderType} and ( <if test="query.inStationId != null and query.inStationId != '' "> IN_STATION_ID = #{query.inStationId} </if> <if test="query.outStationId != null and query.outStationId != '' "> or OUT_STATION_ID = #{query.outStationId} </if> ) </when> <otherwise> <if test="query.orderType != null and query.orderType != '' "> and ORDER_TYPE = #{query.orderType} </if> <if test="query.inStationId != null and query.inStationId != '' "> and IN_STATION_ID = #{query.inStationId} </if> <if test="query.outStationId != null and query.outStationId != '' "> or OUT_STATION_ID = #{query.outStationId} </if> </otherwise> </choose> <if test="query.lineId != null and query.lineId != '' "> and LINE_ID = #{query.lineId} </if> <if test="query.stationId != null and query.stationId != '' "> and STATION_ID = #{query.stationId} </if> <if test="query.operatorId != null and query.operatorId != '' "> and OPERATOR_ID = #{query.operatorId} </if> <if test="query.curDay != null and query.curDay != '' "> and CUR_DAY = #{query.curDay} </if> <if test="query.beginTime != null and query.beginTime != '' "> and OPERATE_TIME between #{query.beginTime} and #{query.endTime} </if> </where> </select>报错语法有问题，修改正确的

在<when>标签中，使用了<if>标签，应该改为${}，例如： <when test="query.orderType != null and query.orderType != '' and query.orderType =='03'"> and ORDER_TYPE = #{query.orderType} and ( ${...

<select id="findAdverts" resultMap="advertMap"> SELECT a.*, p.id AS position_id, p.name AS position_name, m.id AS media_id, m.file_name, m.file_type, m.file_url FROM advert a LEFT JOIN ad_position p ON a.position_id = p.id LEFT JOIN media_file m ON a.media_id = m.id WHERE (id = :id OR :id IS NULL) </select>是否正确

SELECT a.*, p.id AS position_id, p.name AS position_name, m.id AS media_id, m.file_name, m.file_type, m.file_url FROM advert a LEFT JOIN ad_position p ON a.position_id = p.id LEFT JOIN media_file ...

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