Add JDBCUtils.java

JDBCUtils.java

@@ -0,0 +1,169 @@
+package 学生成绩查询管理系统.JDBC;
+
+import javax.swing.*;
+import java.sql.*;
+
+public class JDBCUtils {
+
+    private static Connection conn;
+    private static Statement stmt;
+    private static final String drivername = "com.mysql.cj.jdbc.Driver";
+    private static final String Url = "jdbc:mysql://localhost:3306/studentmanager";
+    private static final String username = "root";
+    private static final String password = "123456";
+
+    static {
+        try {
+            Class.forName(drivername);
+        } catch (ClassNotFoundException e) {
+            JOptionPane.showMessageDialog(null, "加载数据库驱动出错，请查明原因！");
+        }
+        try {
+            conn = DriverManager.getConnection(Url, username, password);
+            stmt = conn.createStatement();
+        } catch (SQLException e) {
+            JOptionPane.showMessageDialog(null, "数据库驱动出错，用户名或密码错误！");
+        }
+    }
+
+    public boolean admincheckLogin(String useraccount, String userpassword) {
+        Connection connection = null;
+        PreparedStatement statement = null;
+        ResultSet resultSet = null;
+
+        try {
+            // 创建数据库连接
+            connection = DriverManager.getConnection(Url, username, password);
+
+            // 编写SQL查询语句
+            String sql = "SELECT * FROM userdatabases WHERE account = ? AND password = ?";
+
+            // 创建预编译的语句对象
+            statement = connection.prepareStatement(sql);
+
+            // 设置参数
+            statement.setString(1, useraccount);
+            statement.setString(2, userpassword);
+
+            // 执行查询并获取结果集
+            resultSet = statement.executeQuery();
+
+            // 返回是否存在匹配的记录
+            return resultSet.next();
+
+        } catch (SQLException e) {
+            e.printStackTrace();
+        } finally {
+            // 关闭数据库资源
+            try {
+                if (resultSet != null) {
+                    resultSet.close();
+                }
+                if (statement != null) {
+                    statement.close();
+                }
+                if (connection != null) {
+                    connection.close();
+                }
+            } catch (SQLException e) {
+                e.printStackTrace();
+            }
+        }
+
+        return false; // 出现异常或查询失败时返回false
+    }
+
+    public boolean teachercheckLogin(String useraccount, String userpassword) {
+        Connection connection = null;
+        PreparedStatement statement = null;
+        ResultSet resultSet = null;
+
+        try {
+            // 创建数据库连接
+            connection = DriverManager.getConnection(Url, username, password);
+
+            // 编写SQL查询语句
+            String sql = "SELECT * FROM teacheraccount WHERE account = ? AND password = ?";
+
+            // 创建预编译的语句对象
+            statement = connection.prepareStatement(sql);
+
+            // 设置参数
+            statement.setString(1, useraccount);
+            statement.setString(2, userpassword);
+
+            // 执行查询并获取结果集
+            resultSet = statement.executeQuery();
+
+            // 返回是否存在匹配的记录
+            return resultSet.next();
+
+        } catch (SQLException e) {
+            e.printStackTrace();
+        } finally {
+            // 关闭数据库资源
+            try {
+                if (resultSet != null) {
+                    resultSet.close();
+                }
+                if (statement != null) {
+                    statement.close();
+                }
+                if (connection != null) {
+                    connection.close();
+                }
+            } catch (SQLException e) {
+                e.printStackTrace();
+            }
+        }
+
+        return false; // 出现异常或查询失败时返回false
+    }
+
+    public boolean studentcheckLogin(String useraccount, String userpassword) {
+        Connection connection = null;
+        PreparedStatement statement = null;
+        ResultSet resultSet = null;
+
+        try {
+            // 创建数据库连接
+            connection = DriverManager.getConnection(Url, username, password);
+
+            // 编写SQL查询语句
+            String sql = "SELECT * FROM studentaccount WHERE account = ? AND password = ?";
+
+            // 创建预编译的语句对象
+            statement = connection.prepareStatement(sql);
+
+            // 设置参数
+            statement.setString(1, useraccount);
+            statement.setString(2, userpassword);
+
+            // 执行查询并获取结果集
+            resultSet = statement.executeQuery();
+
+            // 返回是否存在匹配的记录
+            return resultSet.next();
+
+        } catch (SQLException e) {
+            e.printStackTrace();
+        } finally {
+            // 关闭数据库资源
+            try {
+                if (resultSet != null) {
+                    resultSet.close();
+                }
+                if (statement != null) {
+                    statement.close();
+                }
+                if (connection != null) {
+                    connection.close();
+                }
+            } catch (SQLException e) {
+                e.printStackTrace();
+            }
+        }
+
+        return false; // 出现异常或查询失败时返回false
+    }
+}