日有寸进

步骤一pom.xml 依赖配置<dependency> <groupId>com.baomidou</groupId> <artifactId>mybatis-plus-boot-starter</artifactId> <version>3.1.0</version></dependency><dependency> <groupId>mysql&

步骤一pom.xml 依赖配置<!-- 把mybatis的启动器引入 --><dependency> <groupId>org.mybatis.spring.boot</groupId> <artifactId>mybatis-spring-boot-starter</artifactId> &l...

步骤一<dependency> <groupId>org.mybatis.spring.boot</groupId> <artifactId>mybatis-spring-boot-starter</artifactId> <version>RELEASE</version> &l...

目录配置依赖配置配置文件配置源码SqlSessionFactoryBeanMapperScannerConfigurer配置依赖配置pom.xml<!-- mysql驱动 --><dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java<...

动态 Sql 的辅助元素where、set、trim 作为动态 Sql 的辅助元素，起作用是处理 sql 的封装问题<where>常与 <select> 搭配使用<select id="selectIfandWhereOper" resultMap="BaseResultMap"> select <include refid="Base_Col...

拼装 in 条件入参为数组或者列表Mapper 接口List<TUser> selectForeach4In(String[] names);Mapper xml文件<select id="selectForeach4In" resultMap="BaseResultMap"> select <include refid="Base_Column_Li...

嵌套结果Mapper 接口List<TUser> selectUserPosition1();Mapper xml文件<resultMap id="BaseResultMap" type="TUser"> <id column="id" property="id" /> <result column="user_name" property=...

嵌套结果Mapper 接口List<TUser> selectUserJobs1();返回结果会将查出来的表根据<id>合并Mapper XML配置<resultMap id="BaseResultMap" type="TUser"> <id column="id" property="id" /> <result colu...

先决条件多对多需要一种中间表建立连接关系多对多关系是由两个一对多关系组成的，一对多可以也可以用两种方式实现嵌套结果Mapper 接口List<TUser> selectUserRole();Mapper XML配置<select id="selectUserRole" resultMap="userRoleInfo"> select a.id, ...

String resource = "mybatis-config.xml";InputStream inputStream = Resources.getResourceAsStream(resource);//创建 SqlSessionFactory SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder()....