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ClazzMapper.java

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+package com.zsz.mapper;
+
+import com.baomidou.mybatisplus.core.mapper.BaseMapper;
+import com.zsz.pojo.Clazz;
+import org.springframework.stereotype.Repository;
+
+@Repository
+public interface ClazzMapper extends BaseMapper<Clazz> {
+}

GradeMapper.java

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+package com.zsz.mapper;
+
+import com.baomidou.mybatisplus.core.mapper.BaseMapper;
+import com.zsz.pojo.Grade;
+import org.springframework.stereotype.Repository;
+
+@Repository
+public interface GradeMapper extends BaseMapper<Grade> {
+}

StudentMapper.java

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+package com.zsz.mapper;
+
+import com.baomidou.mybatisplus.core.mapper.BaseMapper;
+import com.zsz.pojo.Student;
+import org.springframework.stereotype.Repository;
+
+@Repository
+public interface StudentMapper extends BaseMapper<Student> {
+}

TeacherMapper.java

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+package com.zsz.mapper;
+
+import com.baomidou.mybatisplus.core.mapper.BaseMapper;
+import com.zsz.pojo.Teacher;
+import org.springframework.stereotype.Repository;
+
+@Repository
+public interface TeacherMapper extends BaseMapper<Teacher> {
+}