mybatis plus多对多

数据库

sc

CREATE TABLE `sc` (
  `xh` varchar(10) NOT NULL DEFAULT '',
  `kcdh` varchar(10) NOT NULL DEFAULT '',
  `cj` smallint(6) DEFAULT NULL,
  PRIMARY KEY (`xh`,`kcdh`) USING BTREE,
  KEY `sc_ibfk_2` (`kcdh`),
  CONSTRAINT `sc_ibfk_1` FOREIGN KEY (`xh`) REFERENCES `student` (`xh`),
  CONSTRAINT `sc_ibfk_2` FOREIGN KEY (`kcdh`) REFERENCES `course` (`kcdh`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

其他的和下面pojo差不多。

pojo

student

@Data
@TableName("student")
public class Student {
    @TableId
    String xh;
   // List<Sc> scs;
}

Course

@Data
@TableName("course")
public class Course {
    &#