<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>

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 中的<![CDATA[ ]]>浅析

[CDATA[ SELECT newsEdit,newsId, newstitle FROM shoppingGuide WHERE 1=1 AND newsday > #{startTime} AND newsday <= #{endTime} ]]> <if test="etidName!=''"> AND newsEdit=#{etidName} </if> </select> 在...

<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="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...

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 ...

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.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。

<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...

<select id="queryBookNameAndType" resultType="zjc.bean.Book" parameterType="map"> <where> <if test="name!=null and name!=''"> bname=#{name} </if> <if test="type!= null and type!=0"> and btype=#{type} </if> </where> </select> 根据上面代码写出对应的@Test测试方式

你可以使用JUnit框架来编写对应的@Test测试方式。首先，需要导入相关的依赖，例如JUnit和MyBatis的依赖。然后，创建一个测试类，并使用注解@Test标记该方法为测试方法。在测试方法中，可以使用MyBatis的配置文件和...

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="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...

检查代码 <update id="updateSub" parameterType="Subsciber"> update subsciber <set> <if test="begindate != null">begindate = #{begindate},</if> <if test="enddate != null">enddate = #{enddate},</if> <if test="svalue != null">svalue = #{svalue},</if> <if test="statue != null and '' != statue">statue = #{statue}</if> </set> where tid = #{tid} and sid = #{sid} </update>

这是一个 MyBatis 的 Mapper XML 文件中的更新语句，其中使用了动态 SQL 标签 <if>，根据参数是否为 null 来动态生成 SQL 语句。这个更新语句中的参数包括 "begindate"、"enddate"、"svalue" 和 "statue"，但是...

<?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="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。...

检查以下代码<update id="updateSub" parameterType="Subsciber"> update subsciber <set> <if test="begindate != null">begindate = #{begindate},</if> <if test="enddate != null">enddate = #{enddate},</if> <if test="svalue != null">svalue = #{svalue},</if> <if test="statue != null and '' != statue">statue = #{statue}</if> </set> where tid = #{tid,jdbcType=VARCHAR} and sid = #{sid,jdbcType=INTEGER} </update>

这段代码是 MyBatis 的 XML 映射文件中的一个 SQL 更新语句。该语句的作用是根据指定的 tid 和 sid 条件来更新 subsciber 表中的记录。更新的字段包括 begindate、enddate、svalue 和 statue。其中，begindate、...

<sql id="wherePrimaryKey"> <if test="mainId != null "> and main_id = #{mainId} </if> <if test="serialNo != null "> and serial_no = #{serialNo} </if> </sql> 无法解析 <delete id="delete" parameterType="sinosoft.services.products.ecargo.protocolManage.prpCargo.model.po.domain.PrpCargoPo"> delete from prp_cargo <where> <include refid="wherePrimaryKey"/> </where> </delete> 中的"wherePrimaryKey"

<include refid="wherePrimaryKey"/> </where> </delete> </mapper> 请确保 <mapper> 标签中的 namespace 属性值与你的 Java 接口或者 XML 文件的命名空间一致。如果问题仍然存在，请提供更多的代码和...

update tbl_emp <set> <if test="empName != null"> emp_name = #{empName,jdbcType=VARCHAR}, </if> <if test="gender != null"> gender = #{gender,jdbcType=CHAR}, </if> <if test="email != null"> email = #{email,jdbcType=VARCHAR}, </if> <if test="dId != null"> d_id = #{dId,jdbcType=INTEGER}, </if> </set> where emp_id = #{empId,jdbcType=INTEGER} </update> <update id="updateByPrimaryKey" parameterType="com.zhiyou.bean.Employee">

这是一个 MyBatis 的 XML 映射文件中...其中，<if> 标签用于判断参数是否为 null，如果不为 null，则更新对应的列。这个 SQL 语句还定义了两个 update 操作，一个是根据 emp_id 更新数据，另一个是根据主键更新数据。

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...

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<select id="queryBookNameAndType" resultType="zjc.bean.Book" parameterType="map"> <where> <if test="name!=null and name!=''"> bname=#{name} </if> <if test="type!= null and type!=0"> and btype=#{type} </if> </where> </select> 根据上面代码写出对应的@Test测试方式

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

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