<select id="selectCliUserList" parameterType="CliUser" resultMap="CliUserResult"> select u.cli_user_id, u.dept_id, u.cli_user_name, u.cli_account, u.email, u.avatar, u.phonenumber, u.sex, u.status, u.del_flag, u.user_ip, u.user_mac, u.login_date, u.create_by, u.create_time, u.remark, d.dept_name, d.leader from cli_user u left join sys_dept d on u.dept_id = d.dept_id where u.del_flag = '0' <if test="cliUserId != null and cliUserId != 0"> AND u.cli_user_id = #{cliUserId} </if> <if test="cliAccount != null and cliAccount != ''"> AND u.cli_account like concat('%', #{cliAccount}, '%') </if> <if test="status != null and status != ''"> AND u.status = #{status} </if> <if test="phonenumber != null and phonenumber != ''"> AND u.phonenumber like concat('%', #{phonenumber}, '%') </if> <if test="params.beginTime != null and params.beginTime != ''"> AND date_format(u.create_time,'%y%m%d') >= date_format(#{params.beginTime},'%y%m%d') </if> <if test="params.endTime != null and params.endTime != ''"> AND date_format(u.create_time,'%y%m%d') <= date_format(#{params.endTime},'%y%m%d') </if> <if test="deptId != null and deptId != 0"> AND (u.dept_id = #{deptId} OR u.dept_id IN ( SELECT t.dept_id FROM sys_dept t WHERE find_in_set(#{deptId}, ancestors) )) </if>  ${params.dataScope} </select>详细解释代码意思

03_ibatis教程_查询指定id的单个对象.rar

<select id="selectUserById" parameterType="int" resultType="com.example.User"> SELECT * FROM user WHERE id = #{id} </select> 这里，id是参数，#{id}是Ibatis的参数占位符，com.example.User是...

SQL.rar_MyBatis3DynamicSql_dynamic mybatis_mybatis_mybatis Dyna

<select id="selectUsers" parameterType="map" resultType="User"> SELECT * FROM users <where> <if test="name != null"> AND name LIKE #{name} </if> <if test="age != null"> AND age <![CDATA[>=]]> #...

<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 = #{...

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; ...

<?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} ...

<?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。

解释一下这段代码：<?xml version = "1.0" encoding = "UTF-8"?> <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD com.example.Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd"> <mapper namespace="com.example.demo.mapper.UserMapper"> <resultMap id="result" type="com.example.demo.entity.User"> <result property="userId" column="userId" /> <result property="userDate" column="userDate" /> <result property="userName" column="userName" /> <result property="userAddress" column="userAddress"/> </resultMap> <select id="ListUser" resultMap="result"> SELECT * FROM user </select> <select id="findUserByName" resultMap="result" parameterType="String"> SELECT * FROM user where userName like concat(concat('%',#{userName}),'%') order by userId desc </select> <select id="queryPage" resultMap="result" parameterType="Integer"> select * from user order by userId desc limit #{startRows},5 </select> <select id="getRowCount" resultType="Integer"> select count(*) from user </select> <insert id="insertUser" parameterType="com.example.demo.entity.User"> INSERT INTO user ( userId,userDate,userName,userAddress ) VALUES ( #{userId}, #{userDate, jdbcType=VARCHAR}, #{userName, jdbcType=VARCHAR}, #{userAddress, jdbcType=VARCHAR} ) </insert> <delete id="delete" parameterType="int"> delete from user where userId=#{userId} </delete> <update id="Update" parameterType="com.example.demo.entity.User"> update user set user.userDate=#{userDate},user.userName=#{userName},user.userAddress=# {userAddress} where user.userId=#{userId} </update> </mapper>

- <select>：定义了一个查询语句，用于从数据库中获取数据。其中id为"ListUser"，resultMap为"result"，表示将查询结果映射到上面定义的resultMap中。 - <insert>：定义了一个插入语句，用于向数据库中插入数据。...

下面代码中的user是什么？在IDEA环境下，如何创造这样一个“user”？代码：<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE mapperPUBLIC "-//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.entity.User"> <id column="id" property="id"/> <result column="name" property="name"/> <result column="age" property="age"/> <result column="gender" property="gender"/> </resultMap> <select id="selectById" resultMap="userMap"> select * from user where id = #{id} </select> <select id="selectAll" resultMap="userMap"> select * from user </select> <insert id="insert" parameterType="com.example.demo.entity.User"> insert into user(name, age, gender) values(#{name}, #{age}, #{gender}) </insert> <update id="update" parameterType="com.example.demo.entity.User"> update user set name = #{name}, age = #{age}, gender = #{gender} where id = #{id} </update> <delete id="deleteById"> delete from user where id = #{id} </delete></mapper>

在IDEA环境下创建一个类，可以在Project视图中右键点击src目录，选择New->Java Class，然后设置类名为"User"，并添加相应的属性（id、name、age、gender）。在这个类中，需要添加对应的getter和setter方法以及构造...

<select id="selectTblZdWcsbByWcsbdm" parameterType="String" resultMap="TblZdWcsbResult"> <include refid="selectTblZdWcsbVo"/> where ssqsbm = #{qsbm} </select>

这是一个 MyBatis 的 XML 映射文件中的一个 SQL 查询语句，用于查询名为 TblZdWcsb 的数据表中符合条件 ssqsbm = #{qsbm} 的记录。其中，#{qsbm} 是一个动态参数，可以在调用该 SQL 语句时传入实际的值。...

<select id="findHdRectorder" parameterType="com.tst.model.hd.HdRectorder" resultType="com.tst.model.hd.HdRectorder"> select h.*, (select process_bar from hd_rectorder_task t where t.hd_no=h.hd_no and t.sta_time=(select max(sta_time) from hd_rectorder_task t1 where t1.hd_no=h.hd_no and t1.status=2) limit 1), (select major_name from sec_major m where h.major_id=m.major_id) major, u.name create_name, u.phone create_phone, u2.name rect_name, u2.phone rect_phone, u3.name concert_name, u3.phone concert_phone, p.proc_name, (select name from te_geoloc t where h.cityid=t.mnodeid and h.cityid>0) cityname, (select name from te_geoloc t where h.areaid=t.id) areaname from hd_rectorder h left join sec_user u on h.create_by=u.username left join sec_user u2 on h.rect_user=u2.username left join sec_user u3 on h.concert_user=u3.username left join hd_rectorder_proc p on h.hd_proc_id = p.proc_id where 1=1 <if test="hd_proc_id!=null and hd_proc_id>0"> and h.hd_proc_id=#{hd_proc_id} </if> </select> 有这样一条sql 其中hd_proc_id有0,1,2,3,4,5,6 其中0表示未处置 1,2，3,4,5都是表示已经处置但是在不同的状态如何获取在处置的数据怎么改进

如果你想获取已处置的数据，可以将条件修改为hd_proc_id>0，这样就可以排除未处置的数据，只获取已处置的数据。改进的话，可以考虑将条件逻辑进行优化，使用更直观的方式表示已处置的状态。比如，可以使用一个...

为什么以下代码会导致上述错误 <select id="selectList" resultMap="BaseResultMap" parameterType="com.wego.entity.query.CartItemQuery"> select <include refid="Base_Column_List"/> from tb_cart_item <where> <if test="id != null"> and id = #{id} </if> <if test="goodsId != null"> and goodsId= #{goodsId} </if> <if test="amount != null"> and amount= #{amount} </if> <if test="money != null"> and money= #{money} </if> </where> order by update_time desc </select>

<if test="id != null"> and id = #{id} </if> xml <if test="goodsId != null"> and goodsId = #{goodsId} </if> xml <if test="amount != null"> and amount = #{amount} </if> xml ...

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 ...

<select id="getDistinctPin1" resultType="String" parameterType="com.example.pmp.pojo.dto.sense.senseDataDto"> SELECT [FAI_26_1_Value] AS pin1 FROM [MESDataCenter].[dbo].[m_D8X_Main_Line3_01_M8_t] <include refid="distinctQuery"/> </select> <select id="getDistinctPin2" resultType="String" parameterType="com.example.pmp.pojo.dto.sense.senseDataDto"> SELECT [FAI_26_2_Value] AS pin2 FROM [MESDataCenter].[dbo].[m_D8X_Main_Line3_01_M8_t] <include refid="distinctQuery"/> </select> <select id="getDistinctPin3" resultType="String" parameterType="com.example.pmp.pojo.dto.sense.senseDataDto"> SELECT [FAI_26_3_Value] AS pin3 FROM [MESDataCenter].[dbo].[m_D8X_Main_Line3_01_M8_t] <include refid="distinctQuery"/> </select>优化mapper.xml中的这些代码

<select id="getDistinctPin1" resultType="String" parameterType="com.example.pmp.pojo.dto.sense.senseDataDto"> <include refid="distinctQuery"> <property name="column" value="FAI_26_1_Value"/> </...

<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>

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，有可能是传递给查询方法的 Project 对象中的属性值不正确导致...

<select id="selectFundSettlementList" parameterType="FundSettlementEntity" resultMap="FundSettlementResult"> select * from t_fund_settlement <where> <if test="orderType != null and orderType != ''"> <if test="orderType=='other'"> and order_type not in ("issue_ticket","return_ticket","rebook_ticket") </if> <if test="orderType=='issue_ticket' or orderType=='return_ticket' or orderType=='rebook_ticket'"> and order_type = #{orderType} </if> </if> </where> order by bill_date_time desc </select>

在<where>标签中，它首先检查订单类型是否不为空且不为空字符串。如果满足这个条件，它会根据订单类型的取值生成不同的查询条件。如果订单类型是"other"，则添加一个条件：订单类型不是"issue_ticket"、"return_...

<select id="selectPPersonListById" parameterType="string" resultMap="PPersonListResult">

其中，id 属性指定了这个 select 语句的唯一标识符，parameterType 属性指定了这个 select 语句的输入参数类型，resultMap 属性指定了这个 select 语句返回结果集的映射关系。具体的实现细节需要结合上下文来确定。

<?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.atguigu.springcloud.dao.PaymentDao"> <insert id="create" parameterType="payment" useGeneratedKeys="true" keyProperty="id"> insert into payment(serial) values(#{serial}) </insert> <resultMap id="BaseResultMap" type="com.atguigu.springcloud.entities.Payment"> <id column="id" property="id" jdbcType="BIGINT"/> <id column="serial" property="serial" jdbcType="VARCHAR"/> </resultMap> <select id="getPaymentById" parameterType="Long" resultMap="BaseResultMap"> select * from payment where id=#{id} </select> </mapper>

第一个SQL语句是一个插入语句，使用了parameterType属性指定参数类型为payment，useGeneratedKeys属性为true表示使用数据库自增主键，并通过keyProperty属性指定主键属性为id。插入语句将serial插入到payment表中。 ...

<select id="selectCarTypeList" parameterType="CarType" resultMap="CarTypeResult"> <include refid="selectCarTypeVo"/> <where> <if test="ctName != null and ctName != ''">and ct_name like concat('%', #{ctName}, '%')</if> <if test="ctImage != null and ctImage != ''">and ct_image = #{ctImage}</if> <if test="ctNumber != null and ctNumber != ''">and ct_number = #{ctNumber}</if> </where> ${params.dataScope} </select>

"null" 是一个英文词汇，通常表示空值、无效或缺少内容等意思。在计算机科学中，它通常用来表示一个变量或对象没有被赋值，或者一个操作没有返回任何有效的结果。在程序设计中，通常会用 "null" 来代表空对象或空...

<select id="getQueryBook" parameterType="String" resultMap="bookResult"> select * from book where book_name = #{bookName} </select>改为模糊查询

<select id="getQueryBook" parameterType="String" resultMap="bookResult"> select * from book where book_name like CONCAT('%',#{bookName},'%') </select> 这样就可以进行模糊查询，匹配包含关键字的...

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<select id="selectPPersonListById" parameterType="string" resultMap="PPersonListResult">

<select id="getQueryBook" parameterType="String" resultMap="bookResult"> select * from book where book_name = #{bookName} </select>改为模糊查询

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