2024/6/9

今天写数据库的实验五，使用Java写了一个十分简易的数据库，连输入都没有，只是证明我用Java连上了sqlserver，代码如下：

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;public class Main {public static void main(String[] args) {String url = "jdbc:sqlserver://localhost:1433;databaseName=YourDatabase";String user = "username";String password = "password";try (Connection conn = DriverManager.getConnection(url, user, password)) {// 插入数据String insertSql = "INSERT INTO students (name, age, gender, class) VALUES (?, ?, ?, ?)";try (PreparedStatement insertStmt = conn.prepareStatement(insertSql)) {insertStmt.setString(1, "Alice");insertStmt.setInt(2, 18);insertStmt.setString(3, "Female");insertStmt.setString(4, "Class A");insertStmt.executeUpdate();}// 更新数据String updateSql = "UPDATE students SET age = ? WHERE name = ?";try (PreparedStatement updateStmt = conn.prepareStatement(updateSql)) {updateStmt.setInt(1, 20);updateStmt.setString(2, "Alice");updateStmt.executeUpdate();}// 删除数据String deleteSql = "DELETE FROM students WHERE name = ?";try (PreparedStatement deleteStmt = conn.prepareStatement(deleteSql)) {deleteStmt.setString(1, "Alice");deleteStmt.executeUpdate();}// 查询数据String selectSql = "SELECT * FROM students";try (PreparedStatement selectStmt = conn.prepareStatement(selectSql);ResultSet rs = selectStmt.executeQuery()) {while (rs.next()) {String name = rs.getString("name");int age = rs.getInt("age");String gender = rs.getString("gender");String className = rs.getString("class");System.out.println(name + " - " + age + " - " + gender + " - " + className);}}} catch (SQLException e) {e.printStackTrace();}}
}