feat(mapper): 添加部门、专业、学生和公告模块的数据访问层

- 创建 DepartmentMapper 接口及其实现，支持按ID查询和查询所有功能
- 创建 MajorMapper 接口及其实现，支持按ID查询和查询所有功能
- 创建 StudentMapper 接口及其实现，支持按ID查询和查询所有功能
- 创建 NoticeMapper 接口及其实现，支持按ID查询和查询所有功能
- 配置对应的 MyBatis XML 映射文件，定义 SQL 查询语句
- 更新 config.xml 配置文件，移除不需要的 ClassMapper 引用
- 修改项目模块配置文件，调整编译输出设置和依赖库引用
- 扩展测试类 TestMyBatis，添加对各个模块的完整测试功能

grademanagement-MyBatisProject/grademanagement-MyBatisProject.iml

@@ -1,14 +1,13 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <module type="JAVA_MODULE" version="4">
-  <component name="NewModuleRootManager" inherit-compiler-output="true">
+  <component name="NewModuleRootManager" inherit-compiler-output="false">
+    <output url="file://$MODULE_DIR$/out/production" />
     <exclude-output />
     <content url="file://$MODULE_DIR$">
       <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
-      <sourceFolder url="file://$MODULE_DIR$/src/com/ssm/mapper" type="java-resource" />
     </content>
     <orderEntry type="inheritedJdk" />
     <orderEntry type="sourceFolder" forTests="false" />
-    <orderEntry type="library" name="lib  (3)" level="project" />
     <orderEntry type="library" name="lib" level="project" />
   </component>
 </module>

grademanagement-MyBatisProject/src/com/ssm/mapper/DepartmentMapper.java

@@ -0,0 +1,10 @@
+package com.ssm.mapper;
+import com.ssm.entity.Department;
+import java.util.List;
+
+public interface DepartmentMapper {
+    // 按ID查询
+    Department getDepartmentById(Integer deptId);
+    // 查询所有
+    List<Department> getDepartmentAll();
+}

grademanagement-MyBatisProject/src/com/ssm/mapper/DepartmentMapper.xml

@@ -0,0 +1,14 @@
+<?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.ssm.mapper.DepartmentMapper">
+    <!-- 按ID查询 -->
+    <select id="getDepartmentById" resultType="com.ssm.entity.Department" parameterType="Integer">
+        SELECT * FROM department WHERE dept_id = #{deptId}
+    </select>
+    <!-- 查询所有 -->
+    <select id="getDepartmentAll" resultType="com.ssm.entity.Department">
+        SELECT * FROM department
+    </select>
+</mapper>

grademanagement-MyBatisProject/src/com/ssm/mapper/MajorMapper.java

@@ -0,0 +1,8 @@
+package com.ssm.mapper;
+import com.ssm.entity.Major;
+import java.util.List;
+
+public interface MajorMapper {
+    Major getMajorById(Integer majorId);
+    List<Major> getMajorAll();
+}

grademanagement-MyBatisProject/src/com/ssm/mapper/MajorMapper.xml

@@ -0,0 +1,12 @@
+<?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.ssm.mapper.MajorMapper">
+    <select id="getMajorById" resultType="com.ssm.entity.Major" parameterType="Integer">
+        SELECT * FROM major WHERE major_id = #{majorId}
+    </select>
+    <select id="getMajorAll" resultType="com.ssm.entity.Major">
+        SELECT * FROM major
+    </select>
+</mapper>

grademanagement-MyBatisProject/src/com/ssm/mapper/NoticeMapper.java

@@ -0,0 +1,8 @@
+package com.ssm.mapper;
+import com.ssm.entity.Notice;
+import java.util.List;
+
+public interface NoticeMapper {
+    Notice getNoticeById(Integer noticeId);
+    List<Notice> getNoticeAll();
+}

grademanagement-MyBatisProject/src/com/ssm/mapper/NoticeMapper.xml

@@ -0,0 +1,12 @@
+<?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.ssm.mapper.NoticeMapper">
+    <select id="getNoticeById" resultType="com.ssm.entity.Notice" parameterType="Integer">
+        SELECT * FROM notice WHERE notice_id = #{noticeId}
+    </select>
+    <select id="getNoticeAll" resultType="com.ssm.entity.Notice">
+        SELECT * FROM notice
+    </select>
+</mapper>

grademanagement-MyBatisProject/src/com/ssm/mapper/StudentMapper.java

@@ -0,0 +1,8 @@
+package com.ssm.mapper;
+import com.ssm.entity.Student;
+import java.util.List;
+
+public interface StudentMapper {
+    Student getStudentById(Integer studentId);
+    List<Student> getStudentAll();
+}

grademanagement-MyBatisProject/src/com/ssm/mapper/StudentMapper.xml

@@ -0,0 +1,12 @@
+<?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.ssm.mapper.StudentMapper">
+    <select id="getStudentById" resultType="com.ssm.entity.Student" parameterType="Integer">
+        SELECT * FROM student WHERE student_id = #{studentId}
+    </select>
+    <select id="getStudentAll" resultType="com.ssm.entity.Student">
+        SELECT * FROM student
+    </select>
+</mapper>

grademanagement-MyBatisProject/src/com/ssm/test/TestMyBatis.java

@@ -1,22 +1,84 @@
 package com.ssm.test;
 
+import com.ssm.entity.Department;
+import com.ssm.entity.Major;
+import com.ssm.entity.Student;
+import com.ssm.entity.Notice;
+import com.ssm.mapper.DepartmentMapper;
+import com.ssm.mapper.MajorMapper;
+import com.ssm.mapper.StudentMapper;
+import com.ssm.mapper.NoticeMapper;
 import org.apache.ibatis.io.Resources;
 import org.apache.ibatis.session.SqlSession;
 import org.apache.ibatis.session.SqlSessionFactory;
 import org.apache.ibatis.session.SqlSessionFactoryBuilder;
 
-import java.io.IOException;
 import java.io.Reader;
+import java.util.List;
 
 public class TestMyBatis {
-	public static void main(String[] args) throws IOException {
+	public static void main(String[] args) throws Exception {
+		// 1. 加载配置文件
 		Reader reader = Resources.getResourceAsReader("config.xml");
-		//SqlSession工厂对象
 		SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(reader);
-		//SqlSession对象:代表了和数据库的一次对话
-		SqlSession session = factory.openSession();
-		System.out.println("MyBatis入门成功！");
-		//关闭链接
-		session.close();
+		SqlSession sqlSession = factory.openSession();
+
+		// 2. 测试院系模块
+		testDepartment(sqlSession);
+		// 3. 测试专业模块
+		testMajor(sqlSession);
+		// 4. 测试学生模块
+		testStudent(sqlSession);
+		// 5. 测试公告模块
+		testNotice(sqlSession);
+
+		sqlSession.close();
+		reader.close();
+	}
+
+	// 院系模块测试
+	private static void testDepartment(SqlSession sqlSession) {
+		DepartmentMapper mapper = sqlSession.getMapper(DepartmentMapper.class);
+		// 按ID查询
+		Department dept = mapper.getDepartmentById(1);
+		System.out.println("===== 院系模块 - 按ID查询 =====");
+		System.out.println(dept);
+		// 查询所有
+		List<Department> deptList = mapper.getDepartmentAll();
+		System.out.println("\n===== 院系模块 - 查询所有 =====");
+		deptList.forEach(System.out::println);
+	}
+
+	// 专业模块测试
+	private static void testMajor(SqlSession sqlSession) {
+		MajorMapper mapper = sqlSession.getMapper(MajorMapper.class);
+		Major major = mapper.getMajorById(1);
+		System.out.println("\n===== 专业模块 - 按ID查询 =====");
+		System.out.println(major);
+		List<Major> majorList = mapper.getMajorAll();
+		System.out.println("\n===== 专业模块 - 查询所有 =====");
+		majorList.forEach(System.out::println);
+	}
+
+	// 学生模块测试
+	private static void testStudent(SqlSession sqlSession) {
+		StudentMapper mapper = sqlSession.getMapper(StudentMapper.class);
+		Student student = mapper.getStudentById(1);
+		System.out.println("\n===== 学生模块 - 按ID查询 =====");
+		System.out.println(student);
+		List<Student> studentList = mapper.getStudentAll();
+		System.out.println("\n===== 学生模块 - 查询所有 =====");
+		studentList.forEach(System.out::println);
+	}
+
+	// 公告模块测试
+	private static void testNotice(SqlSession sqlSession) {
+		NoticeMapper mapper = sqlSession.getMapper(NoticeMapper.class);
+		Notice notice = mapper.getNoticeById(1);
+		System.out.println("\n===== 公告模块 - 按ID查询 =====");
+		System.out.println(notice);
+		List<Notice> noticeList = mapper.getNoticeAll();
+		System.out.println("\n===== 公告模块 - 查询所有 =====");
+		noticeList.forEach(System.out::println);
 	}
-}
+}

grademanagement-MyBatisProject/src/config.xml

@@ -25,6 +25,5 @@
         <mapper resource="com/ssm/mapper/DepartmentMapper.xml"/>
         <mapper resource="com/ssm/mapper/MajorMapper.xml"/>
         <mapper resource="com/ssm/mapper/NoticeMapper.xml"/>
-        <mapper resource="com/ssm/mapper/ClassMapper.xml"/>
     </mappers>
 </configuration>