在guide on Azure, configuring the firewall settings之后，我仍然无法访问我的MySQL数据库。我从所有服务器获得以下内容，即使IP地址列入白名单：
PHP警告：PDO :: __ construct（）：MySQL服务器已经消失了 第3行PHP上的C：\ Users \ admin \ app \ dbtest.php 警告：PDO :: __ construct（）：读取问候数据包时出错。 在线C：\ Users \ admin \ app \ dbtest.php中的PID = 11692 3
警告：PDO :: __ construct（）：MySQL服务器已经消失了 第3行的C：\ Users \ admin \ app \ dbtest.php
警告：PDO :: __ construct（）：读取问候数据包时出错。 在线C：\ Users \ admin \ app \ dbtest.php中的PID = 11692 3连接到SQL Server.PDOException对象时出错（ [message：protected] =＆gt; SQLSTATE [HY000] [2006] MySQL服务器已经消失 [string：Exception：private] =＆gt; [code：protected] =＆gt; 2006年 [file：protected] =＆gt; C：\用户\ ADMIN \程序\ dbtest.php [line：protected] =＆gt; 3 [trace：Exception：private] =＆gt;排列 （ [0] =＆gt;排列 （ [file] =＆gt; C：\用户\ ADMIN \程序\ dbtest.php [line] =＆gt; 3 [function] =＆gt; __构造 [class] =＆gt; PDO [type] =＆gt; - ＆GT; [args] =＆gt;排列 （ [0] =＆gt; MySQL的：DBNAME = mydb的宿主= app.database.windows.net;端口= 1433 2 =＆gt;管理 2 =＆gt;通过 ） ） ） [上一个：例外：私人] =＆gt; [errorInfo] =＆gt; ）1处理完成，退出代码为0
这是我要连接的PHP脚本：
<?php
try {
$conn = new PDO("mysql:dbname=db;host=app.database.windows.net;port=1433", "admin", "pass");
$conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
}
catch (PDOException $e) {
print("Error connecting to SQL Server.");
die(print_r($e));
}
在没有连接超时的情况下连接到Azure MySQL数据库所需的常规连接设置是什么？
答案 0 :(得分：1)
格式为% Created by: DarkRiot43
% Student #:
% Date: Sept 12, 2016
% Course: Numerical Analysis, MTH 510
function [ ] = MacLaurin( func , valueOfx, sigfigs )
%MACLAURIN Summary of this function goes here
% Detailed explanation goes here
% inputs: func: a function
% sigfigs: the number of significant figures you would like
% to have the answer evaluated to.
clc;
syms f(x) x ;
f(x) = func;
presentApprox = 0;
previousApprox = 0;
n = 0;
% Find the criterion for stopping the iteration as an double not a percent.
Es = (0.5*10^(2-round(sigfigs)))/100;
Ea =Es+1; % Ensures Ea is larger than Es to begin
while Ea >= Es
%differentiate the n'th derivative of the equation f(x) w.r.t. x
beenDiff = diff(f(x),n);
presentApprox = previousApprox + (vpa(subs(beenDiff,x,0))* (((valueOfx)^n)/factorial(n))); %MacLaurin series structure used to evaluate.
n = n+1; %Counter incrementation
% Call to function approxError to determine approximate relative error.
Ea = approxError(presentApprox,previousApprox);
previousApprox = presentApprox;
f(x) = beenDiff;
% can be used to ensure proper iterating counting of the program
disp(n);
disp(f(x)); %shows the n'th derivative function
%check to see if in the approxError function there would have been a
%by zero error. if so I edit the value (999 was all i could think of?
% was thinking of using something else but didn't know what to use
if Ea == 999
break;
end
end
else
fprintf('\nStopping criterion used:\t');
disp(Es*100)
fprintf('The estimate generated using MacLaurin Series of ');
disp(func);
fprintf('using the value x = %.3f is: \n\n',valueOfx);
fprintf('%7f',presentApprox);
fprintf('\nThis was done using %d iterations', n);
if Ea == 0
fprintf('\nCould not reach the requested stopping criterion.');
end
end
function [Ea] = approxError(presentApprox,previousApprox)
%Approximate relative error Function
% inputs:
% presentApprox: type double
% previousApprox: type double
% returns:
% Ea: type double
%
% Uses two values to determine the approximate relative error w.r.t
% eachother
if presentApprox ~= 0
Ea = (presentApprox - previousApprox)/(presentApprox);
elseif presentApprox == 0
disp('Cannot determine the value with more precision as it would involve dividing by zero!');
Ea = 999;
end
end
的数据库端点是Azure SQL的端点，它提供SQL Server服务。不是MySQL。请尝试在https://www.microsoft.com/en-us/download/details.aspx?id=20098安装Windows的SQL Server驱动程序。然后尝试使用app.database.windows.net;port=1433连接到Azure SQL。
如果您想在Azure上使用MySQL BaaS，可以参考https://azure.microsoft.com/en-us/documentation/articles/store-php-create-mysql-database/了解详细步骤。
如有任何疑问，请随时告诉我。