<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>

mybatis动态sql（使用<where>标签来处理多个查询条件）

MyBatis提供了多种动态SQL标签，如<if>、<choose>、<when>、<otherwise>、<trim>、<where>、<set>和<foreach>等，这些标签可以用来构建灵活多变的SQL语句。 #### 三、<where>标签详解 <where>...

MyBatis学习-映射文件标签篇(select、resultMap).rar_alikeett_blueaod_mybatis

<select id="selectUser" resultMap="userResultMap"> SELECT * FROM user </select> 这将返回一个User对象列表，每个User对象包含了完整的属性值，包括其关联的Address对象。通过深入理解并熟练运用select...

<?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="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="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...

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>

1. 使用<trim>标签：在<set>标签中，每个<if>标签都会生成一个逗号，最后一个<if>标签需要特殊处理。可以使用<trim>标签来解决这个问题，示例代码如下： xml <set> <trim suffixOverrides="," suffix...

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 ...

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 ...

<select id="queryBlogIF" parameterType="map" resultType="Blog" resultMap="blog"> select * from mybatis.blog where 1=1 <if test="title!=null"> and title=#{title} </if> <if test="author!=null"> and author =#{author} </if> </select> 这段代码什么意思

- <select> 标签定义了一个查询语句，id 属性指定了查询语句的唯一标识。 - parameterType 属性指定了传入查询语句的参数类型，这里是一个 Map 类型。 - resultType 属性指定了查询结果的返回类型，这里...

<select id="selectSysRpuserListByToday" parameterType="SysRpuser" resultMap="SysRpuserResult"> <include refid="selectSysRpuserVo"/> <where> <if test="tid != null and tid != ''"> and tid = #{tid}</if> <if test="tusername != null and tusername != ''"> and tusername like concat('%', #{tusername}, '%')</if> <if test="tnickname != null and tnickname != ''"> and tnickname like concat('%', #{tnickname}, '%')</if> <if test="uamount != null and uamount != ''"> and uamount = #{uamount}</if> <if test="ustatus != null and ustatus != ''"> and ustatus = #{ustatus}</if> <if test="forgroup != null and forgroup != ''"> and forgroup = #{forgroup}</if> <if test="createtime != null "> and createtime = #{createtime}</if> <if test="agentTid != null and agentTid != ''"> and agentTid = #{agentTid}</if> </where> </select>优化以上代码，要求能查询当日数据

<select id="selectSysRpuserListByToday" parameterType="SysRpuser" resultMap="SysRpuserResult"> <include refid="selectSysRpuserVo"/> <where> <if test="tid != null and tid != ''"> and tid = #{tid}</...

<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...

<?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。

29.存在如下配置: <select id="sqiLog" parameterType="appLog"resultType="appLog"> select*from t_applog where <if test="title!=null"> title=#{title}</if>

"sqiLog"的配置是一个Mybatis的<select>标签，在其中定义了一个名为"sqiLog"的SQL...在SQL查询语句中使用了一个<if>标签，用于判断参数"title"是否为null，如果不为null则会加上一个"where title=参数title"的条件。

解释代码<?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.synu.sx.demo.mapper.StudentMapper"> <select id="list" parameterType="java.util.Map" resultType="com.synu.sx.demo.entity.Student"> select * from student <where> <if test="param.id != null and param.id != ''"> id = #{param.id} </if> </where> </select> <select id="listQuery" parameterType="java.util.Map" resultType="com.synu.sx.demo.entity.Student"> select * from student <where> <if test="param.name != null and param.name != ''"> and name like concat('%', #{param.name} ,'%') </if> <if test="param.id != null and param.id != ''"> and id like concat('%', #{param.id} ,'%') </if> </where> limit #{param.start}, #{param.limit} </select> <select id="listQueryCount" parameterType="java.util.Map" resultType="java.lang.Integer"> select count(*) from student <where> <if test="param.name != null and param.name != ''"> and name like concat('%', #{param.name} ,'%') </if> <if test="param.id != null and param.id != ''"> and id like concat('%', #{param.id} ,'%') </if> </where> </select> </mapper>

在<if>标签中，如果param的id属性不为空，则添加了一个id = #{param.id}的条件。第二个查询语句的id是"listQuery"，与第一个查询语句类似，不同之处在于它添加了更多的条件筛选和分页功能。除了id之外，它还检查了...

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 String name; private int teacherId; private Teacher teacher; // 省略getter和setter方法 } 2. Teacher POJO代码： public class Teacher { private int id; private String ...

<?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.iotek.ssm.dao.ApplyDao"> <select id="queryAllApply" resultType="Apply"> select * from apply </select> <select id="queryApplyByUname" parameterType="String" resultType="Apply"> select * from apply where uname=#{uname} </select> <insert id="insertApply" parameterType="Apply"> insert into apply(uname,deliveryTime,checkStatus,interviewStatus,interviewTime,hiring,did) values(#{uname},#{deliveryTime},#{checkStatus},#{interviewStatus},#{interviewTime},#{hiring},#{did}) </insert> <delete id="deleteApply" parameterType="int"> delete from apply where aid=#{aid} </delete> <update id="updateApply" parameterType="Apply"> update apply set checkStatus=#{checkStatus},interviewStatus=#{interviewStatus}, interviewTime=#{interviewTime},hiring=#{hiring} where aid=#{aid} </update> <select id="queryApplyByAid" parameterType="int" resultType="Apply"> select * from apply where aid=#{aid} </select> <select id="queryApplyByUnameAndInterviewStatus" parameterType="String" resultType="Apply"> select * from apply where uname=#{uname} and interviewStatus="按时面试" </select> <select id="queryApplyByDidAndInterviewStatus" resultType="Apply"> select * from apply where did=#{did} and interviewStatus="确认面试" </select> </mapper>这段代码是干嘛的

这段代码是 MyBatis 的 Mapper 文件，用于定义数据库操作的 SQL 语句。该 Mapper 定义了一些 SQL 语句，包括查询所有申请、按用户名查询申请、...这些 SQL 语句可以通过 MyBatis 框架调用执行，从而对数据库进行操作。

<select id="getNoFinishByMajor" parameterType="String" resultMap="APointPleaseForgein"> SELECT ID, <include refid="column"/> FROM a_point_please_forgein where major_name = #{majorName} <![CDATA[ AND state < 6 AND state <> 4 ]]> order by createtime desc </select>

这是一段 MyBatis 框架中的 SQL 语句，用于查询 a_...其中，<include refid="column"/> 部分引用了另一个 resultMap（APointPleaseForgein），用于动态生成查询的列。最终结果按照创建时间（createtime）降序排序。

<?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="org.mybatis.example.BlogMapper"> <select id="selectStudentById" resultType="Student"> select * from s_student where id = #{id} </select> <select id="selectStudentByCId" resultType="Student"> select * from s_student where cid = #{cid} </select> <insert id="insertStudent" parameterType="Student" > insert into s_student(name,age,cid) values(#{name},#{age},#{cid}) </insert> <select id="selectStudentsByClassName" resultType="Student"> SELECT s.* FROM s_student s JOIN s_class c ON s.cid = c.id WHERE c.name = #{className} </select> <update id="updateStudent" parameterType="Student"> UPDATE s_student SET name = #{name}, age = #{age} WHERE id = #{id} </update> <delete id="deleteStudentById" parameterType="int"> DELETE FROM s_student WHERE id = #{id} </delete> </mapper>

resultType 属性指定了查询结果的返回类型，parameterType 属性指定了 SQL 语句的参数类型。具体来说，这个映射文件中包含了通过学生 id 和班级 id 查询学生信息、插入学生信息、通过班级名称查询学生信息、修改学生...

毕设和企业适用springboot企业数据管理平台类及跨境电商管理平台源码+论文+视频.zip

毕设和企业适用springboot企业数据管理平台类及跨境电商管理平台源码+论文+视频

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<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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