qq_42472710的博客

student实体类： import lombok.Data; @Data public class Student { private int id; private String name; private String tid; } teacher实体类： import lombok.Data; import java.util.List; @Data public class Teacher { private int id; private Strin

1、子查询 <select id="getStudent" resultMap="StudentTeacher"> select * from mybatis.student </select> <resultMap id="StudentTeacher" type="Student"> <result property="id" column="id"/> <result proper

1、UserMapper.java import com.wjj.pojo.User; import org.apache.ibatis.annotations.Delete; import org.apache.ibatis.annotations.Insert; import org.apache.ibatis.annotations.Select; import org.apache.ibatis.annotations.Update; import java.util.List; import j

1、UserMapper.java List<User> getUserByLimit(Map<String, Integer> map); 2、Usermapper.xml <select id="getUserByLimit" parameterType="map" resultType="com.wjj.pojo.User"> select * from mybatis.user limit #{startIndex}, #{pageSize} </

1、 导包： <dependency> <groupId>log4j</groupId> <artifactId>log4j</artifactId> <version>1.2.17</version> </dependency> 2、在配置文件目录下新建一个log4j.properties，内容如下： #将等级为DEBUG的日志信息输出到console和file这两个目的地，conso