<insert id="insertUser" parameterType="SysUser" useGeneratedKeys="true" keyProperty="userId"> insert into sys_user( <if test="userId != null and userId != 0">user_id,</if> <if test="deptId != null and deptId != 0">dept_id,</if> <if test="userName != null and userName != ''">user_name,</if> <if test="nickName != null and nickName != ''">nick_name,</if> <if test="email != null and email != ''">email,</if> <if test="avatar != null and avatar != ''">avatar,</if> <if test="phonenumber != null and phonenumber != ''">phonenumber,</if> <if test="sex != null and sex != ''">sex,</if> <if test="password != null and password != ''">password,</if> <if test="status != null and status != ''">status,</if> <if test="createBy != null and createBy != ''">create_by,</if> <if test="remark != null and remark != ''">remark,</if> create_time )values( <if test="userId != null and userId != ''">#{userId},</if> <if test="deptId != null and deptId != ''">#{deptId},</if> <if test="userName != null and userName != ''">#{userName},</if> <if test="nickName != null and nickName != ''">#{nickName},</if> <if test="email != null and email != ''">#{email},</if> <if test="avatar != null and avatar != ''">#{avatar},</if> <if test="phonenumber != null and phonenumber != ''">#{phonenumber},</if> <if test="sex != null and sex != ''">#{sex},</if> <if test="password != null and password != ''">#{password},</if> <if test="status != null and status != ''">#{status},</if> <if test="createBy != null and createBy != ''">#{createBy},</if> <if test="remark != null and remark != ''">#{remark},</if> sysdate() ) </insert>中的 sysdate()的原理是什么

<insert id="insertDeputyActivityScore" parameterType="DeputyActivityScore" useGeneratedKeys="true" keyProperty="id"> insert into g_deputy_activity_score <trim prefix="(" suffix=")" suffixOverrides=","> <if test="scoreQuestionId != null">score_question_id,</if> <if test="scoreContent != null">score_content,</if> <if test="scoreStandard != null">score_standard,</if> <if test="scoreBasis != null">score_basis,</if> <if test="fraction != null">fraction,</if> <if test="type != null">type,</if> <if test="sort != null">sort,</if> <if test="authBy != null">auth_by,</if> <if test="createTime != null">create_time,</if> </trim> <trim prefix="values (" suffix=")" suffixOverrides=","> <if test="scoreQuestionId != null">#{scoreQuestionId},</if> <if test="scoreContent != null">#{scoreContent},</if> <if test="scoreStandard != null">#{scoreStandard},</if> <if test="scoreBasis != null">#{scoreBasis},</if> <if test="fraction != null">#{fraction},</if> <if test="type != null">#{type},</if> <if test="sort != null">#{sort},</if> <if test="authBy != null">#{authBy},</if> <if test="createTime != null">#{createTime},</if> </trim> </insert>解释一下什么意思

<think>嗯，用户想了解MyBatis动态SQL中的trim和if标签的功能与结构。首先，我需要回忆MyBatis... <if test="filterA">OR price > 100</if> <if test="filterB">OR stock < 10</if> </trim> </where> </select>

<insert id="insertFileClass" parameterType="FileClass" useGeneratedKeys="true" keyProperty="classId"> insert into file_class <trim prefix="(" suffix=")" suffixOverrides=","> <if test="classSpecialty != null">class_specialty,</if> </trim> <trim prefix="values (" suffix=")" suffixOverrides=","> <if test="classSpecialty != null">#{classSpecialty},</if> </trim> </insert>

3. useGeneratedKeys="true"表示将生成的主键值返回给keyProperty指定的属性。 4. keyProperty="classId"指定了用于存储生成的主键值的属性名。接下来，我们来看具体的插入语句： sql insert into file_...

<?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.ruoyi.system.mapper.EmployeeMapper"> <resultMap type="Employee" id="EmployeeResult"> <result property="id" column="id" /> <result property="factory" column="factory" /> <result property="department" column="department" /> <result property="position" column="position" /> <result property="employee_name" column="employee_name" /> <result property="employee_jobNumber" column="employee_jobNumber" /> <result property="phonenumber" column="phonenumber" /> <result property="entry_time" column="entry_time" /> </resultMap> <sql id="selectEmployeeVo"> select id, factory, department, position,employee_name,employee_jobNumber,phonenumber,entry_time from employee_data </sql> <select id="getEmployeeList" parameterType="Employee" resultMap="EmployeeResult"> <include refid="selectEmployeeVo"/> <where> <if test="employee_name != null and employee_name != ''"> and employee_name like concat('%', #{employee_name}, '%')</if> <if test="employee_jobNumber != null and employee_jobNumber != ''"> and employee_jobNumber = #{employee_jobNumber}</if> </where> </select> <select id="selectEmployeeById" parameterType="int" resultMap="EmployeeResult"> <include refid="selectEmployeeVo"/> where id = #{id} </select> <update id="updateEmployee" parameterType="Employee"> update Employee <trim prefix="SET" suffixOverrides=","> <if test="factory != null and factory != ''">factory = #{factory},</if> <if test="department != null and department != ''">department = #{department},</if> <if test="position != null and position != ''">position = #{position},</if> <if test="employee_name != null and employee_name != ''">employee_name = #{employee_name},</if> <if test="employee_jobNumber != null">employee_jobNumber = #{employee_jobNumber},</if> <if test="phonenumber != null and phonenumber != ''">phonenumber = #{phonenumber},</if> <if test="entry_time != null and entry_time != ''">entry_time = #{entry_time},</if> </trim> where id = #{id} </update> <delete id="deleteEmployeeById" parameterType="int"> delete from employee_data where id = #{id} </delete> <delete id="deleteEmployeeByIds" parameterType="String"> delete from employee_data where id in <foreach item="id" collection="array" open="(" separator="," close=")"> #{id} </foreach> </delete> <insert id="insertEmployee" parameterType="Employee" useGeneratedKeys="true" keyProperty="id"> insert into employee_data <trim prefix="(" suffix=")" suffixOverrides=","> <if test="factory != null and factory != ''">factory,</if> <if test="department != null and department != ''">department,</if> <if test="position != null and position != ''">position = #{position},</if> <if test="employee_name != null and employee_name != ''">employee_name = #{employee_name},</if> <if test="employee_jobNumber != null">employee_jobNumber = #{employee_jobNumber},</if> <if test="phonenumber != null and phonenumber != ''">phonenumber = #{phonenumber},</if> <if test="entry_time != null and entry_time != ''">entry_time = #{entry_time},</if> examine_result, </trim> <trim prefix="values (" suffix=")" suffixOverrides=","> <if test="factory != null and factory != ''">factory,</if> <if test="department != null and department != ''">department,</if> <if test="position != null and position != ''">position = #{position},</if> <if test="employee_name != null and employee_name != ''">employee_name = #{employee_name},</if> <if test="employee_jobNumber != null">employee_jobNumber = #{employee_jobNumber},</if> <if test="phonenumber != null and phonenumber != ''">phonenumber = #{phonenumber},</if> <if test="entry_time != null and entry_time != ''">entry_time = #{entry_time},</if> 1 </trim> </insert> </mapper>

useGeneratedKeys="true" keyProperty="id"> INSERT INTO employee (name, department, position, salary) VALUES (#{name}, #{department}, #{position}, #{salary}) </insert> <!-- 3. 更新操作（引用[3]中...

<insert id="insertOrder" parameterType="Integer" useGeneratedKeys="true" keyProperty="order_id"> insert into orders(user_id, total) select user_id, sum(total) from cart where user_id = #{userId} </insert> <insert id="insertOrderDetail" parameterType="Integer"> insert into order_detail(order_id, book_id, num, total) select #{order_id}, c.book_id, c.num, c.total from cart c where c.user_id = #{userId} </insert> 在mapper中的两个标签里，如何设置能让insertOrder执行完之后自动执行insertOrderDetail

<insert id="insertOrder" parameterType="Integer" useGeneratedKeys="true" keyProperty="order_id"> <selectKey keyProperty="order_id" orderType="BEFORE" resultType="java.lang.Integer"> SELECT nextval('...

<insert id="insertTWarning" parameterType="TWarning"> insert into t_warning <trim prefix="(" suffix=")" suffixOverrides=","> <if test="id != null">id,</if> <if test="warntop != null">warntop,</if> <if test="warnblow != null">warnblow,</if> <if test="warntype != null">warntype,</if> createtime, <if test="createid != null">createid,</if> <if test="updateid != null">updateid,</if> </trim> <trim prefix="values (" suffix=")" suffixOverrides=","> <if test="id != null">#{id},</if> <if test="warntop != null">#{warntop},</if> <if test="warnblow != null">#{warnblow},</if> <if test="warntype != null">#{warntype},</if> now(), <if test="createid != null">#{createid},</if> <if test="updateid != null">#{updateid},</if> </trim> </insert>

<insert id="insertTWarning" parameterType="TWarning"> insert into t_warning   </insert> - **功能**：将TWarning对象插入数据库 - **动态SQL**：根据...

<insert id="insertSelective" parameterType="com.example.pojo.Admin" > insert into admin <trim prefix="(" suffix=")" suffixOverrides="," > <if test="id != null" > id, </if> <if test="username != null" > username, </if> <if test="password != null" > password, </if> </trim> <trim prefix="values (" suffix=")" suffixOverrides="," > <if test="id != null" > #{id,jdbcType=INTEGER}, </if> <if test="username != null" > #{username,jdbcType=VARCHAR}, </if> <if test="password != null" > #{password,jdbcType=VARCHAR}, </if> </trim> </insert>

其中，<trim> 标签用于去掉 SQL 语句中的多余逗号和括号，<if> 标签用于判断属性是否为 null，如果不为 null，则将属性名和属性值拼接到 SQL 语句中。该插入语句使用了两个 <trim> 标签，分别对应插入语句中的列名...

优化语句<update id="updateByPrimaryKey" parameterType="com.example.demo.domain.Permission"> update sys_permission <set> <if test="permission_id!=null"> permission_id = #{permission_id}, </if> <if test="pid!=null"> pid = #{pid}, </if> <if test="name!=null"> name = #{name}, </if> <if test="type!=null"> type = #{type}, </if> <if test="permission_value!=null"> permission_value = #{permission_value}, </if> <if test="uri!=null"> uri = #{uri}, </if> <if test="icon!=null"> icon = #{icon}, </if> <if test="status!=null"> status = #{status}, </if> <if test="ctime!=null"> ctime = #{ctime}, </if> <if test="orders!=null"> orders = #{orders}, </if> <if test="system_id!=null"> system_id = #{system_id} </if> </set> where permission_id = #{permission_id} </update>

<if test="field=='permission_id'"> permission_id = #{permission_id}, </if> <if test="field=='pid'"> pid = #{pid}, </if>  <if test="field=='system_id'"> system_id = #{system_...

<?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.sky.mapper.DishMapper"> <insert id="insert" useGeneratedKeys="true" keyProperty="id"> insert into dish (name, category_id, price, image, description, create_time, update_time, create_user, update_user, status) values (#{name}, #{categoryId}, #{price}, #{image}, #{description}, #{createTime}, #{updateTime}, #{createUser}, #{updateUser}, #{status}) </insert> //分页查询 <select id="pageQuery" resultType="com.sky.vo.DishVO"> select d.* , c.name as categoryName from dish d left outer join category c on d.category_id = c.id <where> <if test="name != null"> and d.name like concat('%',#{name},'%') </if> <if test="categoryId != null"> and d.category_id = #{categoryId} </if> <if test="status != null"> and d.status = #{status} </if> </where> order by d.create_time desc </select> <update id="update"> update dish <set> <if test="name != null">name = #{name},</if> <if test="categoryId != null">category_id = #{categoryId},</if> <if test="price != null">price = #{price},</if> <if test="image != null">image = #{image},</if> <if test="description != null">description = #{description},</if> <if test="status != null">status = #{status},</if> <if test="updateTime != null">update_time = #{updateTime},</if> <if test="updateUser != null">update_user = #{updateUser},</if> </set> where id = #{id} </update> <select id="list" resultType="Dish" parameterType="Dish"> select * from dish <where> <if test="name != null">

<insert id="insertDish" parameterType="com.example.model.Dish" useGeneratedKeys="true" keyProperty="id"> INSERT INTO dish (name, price, category_id, create_time) VALUES (#{name}, #{price}, #{...

<insert id="insertListSelective" parameterType="java.util.List"> INSERT INTO art_customer_leads_pool <trim prefix="(" suffix=")" suffixOverrides=","> <if test="id != null">id,</if> <if test="activityId != null">activity_id,</if> <if test="activityName != null">activity_name,</if> <if test="comCode != null">com_code,</if> <if test="comName != null">com_name,</if> <if test="customerName != null">customer_name,</if> <if test="licenseNo != null">license_no,</if> <if test="expiryMonth != null">expiry_month,</if> <if test="mobile != null">mobile,</if> <if test="referrerStaffNo != null">referrer_staff_no,</if> <if test="referrerType != null">referrer_type,</if> <if test="status != null">status,</if> <if test="source != null">source,</if> <if test="leadInboundTime != null">lead_inbound_time,</if> <if test="createTime != null">create_time,</if> <if test="updateTime != null">update_time,</if> </trim> VALUES <foreach collection="item" index="index" item="item" separator=","> <trim prefix="(" suffix=")" suffixOverrides=","> <if test="item.id != null">#{item.id, jdbcType=BIGINT},</if> <if test="item.activityId != null">#{item.activityId, jdbcType=VARCHAR},</if> <if test="item.activityName != null">#{item.activityName, jdbcType=VARCHAR},</if> <if test="item.comCode != null">#{item.comCode, jdbcType=VARCHAR},</if> <if test="item.comName != null">#{item.comName, jdbcType=VARCHAR},</if> <if test="item.customerName != null">#{item.customerName, jdbcType=VARCHAR},</if> <if test="item.licenseNo != null">#{item.licenseNo, jdbcType=VARCHAR},</if> <if test="item.expiryMonth != null">#{item.expiryMonth, jdbcType=DATE},</if> <if test="item.mobile != null">#{item.mobile, jdbcType=VARCHAR},</if> <if test="item.referrerStaffNo != null">#{item.referrerStaffNo, jdbcType=VARCHAR},</if> <if test="item.referrerType != null">#{item.referrerType, jdbcType=VARCHAR},</if> <if test="item.status != null">#{item.status, jdbcType=SMALLINT},</if> <if test="item.source != null">#{item.source, jdbcType=VARCHAR},</if> <if test="item.leadInboundTime != null">#{item.leadInboundTime, jdbcType=DATE},</if> <if test="item.createTime != null">#{item.createTime, jdbcType=DATE},</if> <if test="item.updateTime != null">#{item.updateTime, jdbcType=DATE},</if> </trim> </foreach> </insert> public interface ArtCustomerLeadsPoolExtMapper { int insertListSelective(@Param("item") List<ArtCustomerLeadsPool> record); }我这个那里写错了

= null">activity_id,</if> <if test="item.activityName != null">activity_name,</if> <if test="item.comCode != null">com_code,</if> <if test="item.comName != null">com_name,</if> <if test="item....

<insert id="insertUser" parameterType="User" useGeneratedKeys="true" keyProperty="id"> INSERT INTO user (name, username, created_at, updated_at, birthday) VALUES (#{name}, #{username}, NOW(), NOW(), NOW()) </insert>这个怎么改成返回自增id

<insert id="insertUser" parameterType="User" useGeneratedKeys="true" keyProperty="id"> INSERT INTO user (name, username, created_at, updated_at, birthday) VALUES (#{name}, #{username}, ...

<insert id="insert" parameterType="setmeal" useGeneratedKeys="true" keyProperty="id">

这段代码是MyBatis中的一个插入语句，其中useGeneratedKeys="true...<insert id="insert" parameterType="setmeal" useGeneratedKeys="true" keyProperty="id">  </insert>

结合下如下sql语句分析下：<update id="updateUser" parameterType="User"> update user <set> <if test="username != null">username = #{username},</if> <if test="password != null">password = #{password},</if> <if test="email != null">email = #{email},</if> <if test="phone != null">phone = #{phone}</if> </set> where id = #{id} </update>

- <set> 标签表示要更新的字段列表，内部使用了多个 <if> 标签进行判断，如果参数中对应的字段不为 null，则进行更新。 - #{username}、#{password}、#{email}、#{phone} 是占位符，表示要更新的字段的值，MyBatis ...

<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...

分析一下代码的意思<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd"> <mapper namespace="com.example.mapper.AdminMapper"> <select id="selectAll" resultType="com.example.entity.Admin"> select * from admin <where> <if test="name != null"> and name like concat('%', #{name}, '%')</if> </where> order by id desc </select> <delete id="deleteById"> delete from admin where id = #{id} </delete> <insert id="insert" parameterType="com.example.entity.Admin" useGeneratedKeys="true"> insert into admin <trim prefix="(" suffix=")" suffixOverrides=","> <if test="id != null">id,</if> <if test="username != null">username,</if> <if test="password != null">password,</if> <if test="name != null">name,</if> <if test="phone != null">phone,</if> <if test="email != null">email

INSERT INTO employees (name, age, department_id) VALUES (#{name}, #{age}, #{departmentId}) </insert> 对于某些特殊数据库（如 PostgreSQL），可以利用如下方式完成插入后立即返回数据： xml <select ...

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

= null ">and school_id = #{schoolId}</if> <if test="clockTime_begin != null ">and clock_time >= #{clockTime_begin}</if> <if test="clockTime_end != null ">and clock_time <= #{clockTime_end}</if...

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<insert id="insertUser" parameterType="User" useGeneratedKeys="true" keyProperty="id"> INSERT INTO user (name, username, created_at, updated_at, birthday) VALUES (#{name}, #{username}, NOW(), NOW(), NOW()) </insert>这个怎么改成返回自增id

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