app操作mysql数据库文件

// 示例代码（Java + JDBC）
String sql = "SELECT * FROM users WHERE username = ?";
try (PreparedStatement pstmt = connection.prepareStatement(sql)) {
    pstmt.setString(1, username);
    ResultSet rs = pstmt.executeQuery();
    // 处理结果集
} catch (SQLException e) {
    e.printStackTrace();
}

// 添加JDBC驱动依赖
implementation 'mysql:mysql-connector-java:8.0.23'

// 数据库连接工具类
public class DBUtil {
    private static final String URL = "jdbc:mysql://your_server_address:3306/your_database";
    private static final String USER = "your_username";
    private static final String PASSWORD = "your_password";

    public static Connection getConnection() throws SQLException {
        return DriverManager.getConnection(URL, USER, PASSWORD);
    }
}

// 使用示例
public void queryData(String username) {
    String sql = "SELECT * FROM users WHERE username = ?";
    try (Connection conn = DBUtil.getConnection();
         PreparedStatement pstmt = conn.prepareStatement(sql)) {
        pstmt.setString(1, username);
        ResultSet rs = pstmt.executeQuery();
        while (rs.next()) {
            // 处理每一行数据
        }
    } catch (SQLException e) {
        e.printStackTrace();
    }
}