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+## 1. 作业
+
+### 创建数据库：
+
+```sql
+CREATE DATABASE student_db;
+```
+
+### 选择数据库：
+
+```sql
+USE student_db;
+
+```
+
+### 创建student表：
+
+```sql
+CREATE TABLE student (
+  编号 INT PRIMARY KEY,
+  姓名 VARCHAR(50),
+  性别 VARCHAR(10)
+);
+
+```
+
+### 插入数据：
+
+```sql
+INSERT INTO student (编号, 姓名, 性别) VALUES
+(1, '张三', '男'),
+(2, '李四', '女'),
+(3, '王五', '男');
+
+```
+
+### JAVA
+
+```java
+import java.sql.*;
+
+public class StudentDatabase {
+    private Connection connection;
+    private Statement statement;
+
+    public StudentDatabase() {
+        try {
+            // 连接到MySQL数据库
+            connection = DriverManager.getConnection("jdbc:mysql://localhost/student_db", "用户名", "密码");
+            statement = connection.createStatement();
+        } catch (SQLException e) {
+            e.printStackTrace();
+        }
+    }
+
+    // 查询功能，查询student表中所有数据
+    public void queryStudents() {
+        try {
+            ResultSet resultSet = statement.executeQuery("SELECT * FROM student");
+            while (resultSet.next()) {
+                int id = resultSet.getInt("编号");
+                String name = resultSet.getString("姓名");
+                String gender = resultSet.getString("性别");
+                System.out.println("编号: " + id + ", 姓名: " + name + ", 性别: " + gender);
+            }
+        } catch (SQLException e) {
+            e.printStackTrace();
+        }
+    }
+
+    // 添加功能，向student表中添加一条数据
+    public void addStudent(int id, String name, String gender) {
+        try {
+            String query = "INSERT INTO student (编号, 姓名, 性别) VALUES (" + id + ", '" + name + "', '" + gender + "')";
+            statement.executeUpdate(query);
+            System.out.println("已添加学生信息");
+        } catch (SQLException e) {
+            e.printStackTrace();
+        }
+    }
+
+    // 修改功能，修改student表中指定学生的数据
+    public void updateStudent(int id, String newName, String newGender) {
+        try {
+            String query = "UPDATE student SET 姓名 = '" + newName + "', 性别 = '" + newGender + "' WHERE 编号 = " + id;
+            statement.executeUpdate(query);
+            System.out.println("已更新学生信息");
+        } catch (SQLException e) {
+            e.printStackTrace();
+        }
+    }
+
+    // 删除功能，删除student表中指定学生的数据
+    public void deleteStudent(int id) {
+        try {
+            String query = "DELETE FROM student WHERE 编号 = " + id;
+            statement.executeUpdate(query);
+            System.out.println("已删除学生信息");
+        } catch (SQLException e) {
+            e.printStackTrace();
+        }
+    }
+
+    public static void main(String[] args) {
+        StudentDatabase studentDB = new StudentDatabase();
+        studentDB.queryStudents(); // 查询所有学生信息
+
+        studentDB.addStudent(4, "赵六", "女"); // 添加学生信息
+        studentDB.queryStudents();
+
+        studentDB.updateStudent(3, "王五", "女"); // 修改学生信息
+        studentDB.queryStudents();
+
+        studentDB.deleteStudent(2); // 删除学生信息
+        studentDB.queryStudents();
+    }
+}
+
+```