Home Database Mysql Tutorial Access ADO多连接时数据延迟无法同步无法及时更新的解决办法

Access ADO多连接时数据延迟无法同步无法及时更新的解决办法

Jun 07, 2016 pm 03:42 PM
access Synchronize Delay data connect

这个问题由来已久,由于不是非常影响项目进度,所以一直没有重视。最近闲来,又遇到此问题,决心仔细研究一番。上网搜了半天,整整半天,没有发现比较通俗易懂的文章,没办法,看看微软的资料,自己动手吧,把这个解决过程记录下来,以供大伙参考。 问题描述

这个问题由来已久,由于不是非常影响项目进度,所以一直没有重视。最近闲来,又遇到此问题,决心仔细研究一番。上网搜了半天,整整半天,没有发现比较通俗易懂的文章,没办法,看看微软的资料,自己动手吧,把这个解决过程记录下来,以供大伙参考。


问题描述:

ADODB::_ConnectionPtr    m_pConnection1;

ADODB::_ConnectionPtr    m_pConnection2;

ADODB::_RecordsetPtr    m_pRecordset1;

ADODB::_RecordsetPtr    m_pRecordset2;

初始化过程略去。。。。。。


当使用

m_pRecordset1->Open(pSql ,m_pConnection1.GetInterfacePtr(),ADODB::adOpenDynamic,ADODB::adLockOptimistic,ADODB::adCmdText);

进行INSERT、UPDATE、Delete 操作后,立即用m_pConnection2 和m_pRecordset2 对更新的表进行查询,发现刚刚m_pConnection1添加的数据根本没法查出来,修改的数据也没更新,删除记录也依旧乖乖的呆在数据库里。

这种情况只有在使用两个或两个以上连接进行数据库操作时才会出现,只有一个连接是不会有这个问题的。但很多时候我们不得不使用多个连接同时操作数据,所以问题必须解决。


解决办法:

在执行增删改的 SQL语句时使用“事务Transaction” , 使用JRO引擎强制刷新 查询连接的 数据缓存。

#import "c:\program files\common files\system\ado\msjro.dll"

//开始事务
m_pConnection->BeginTrans();
//inster update delete操作 代码省略

//提交
m_pConnection->CommitTrans();

<pre class="brush:php;toolbar:false">//在查询前刷新缓存 刷新过后进行查询操作,数据就不会有延迟现象了。
BOOL CDBOperate::RefreshData()
{
	JRO::IJetEnginePtr jet(__uuidof(JRO::JetEngine));
	jet->RefreshCache(m_pConnection);
	return TRUE;
}
Copy after login

Copy after login
Copy after login
通过上述代码,实现ACCESS多连接数据同步。

参考文章

http://support.microsoft.com/kb/200300

Copy after login
Copy after login
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

What are the benefits of multithreading in c#? What are the benefits of multithreading in c#? Apr 03, 2025 pm 02:51 PM

The advantage of multithreading is that it can improve performance and resource utilization, especially for processing large amounts of data or performing time-consuming operations. It allows multiple tasks to be performed simultaneously, improving efficiency. However, too many threads can lead to performance degradation, so you need to carefully select the number of threads based on the number of CPU cores and task characteristics. In addition, multi-threaded programming involves challenges such as deadlock and race conditions, which need to be solved using synchronization mechanisms, and requires solid knowledge of concurrent programming, weighing the pros and cons and using them with caution.

How to avoid third-party interfaces returning 403 errors in Node environment? How to avoid third-party interfaces returning 403 errors in Node environment? Apr 01, 2025 pm 02:03 PM

How to avoid the third-party interface returning 403 error in the Node environment. When calling the third-party website interface using Node.js, you sometimes encounter the problem of returning 403 error. �...

How to use sql if statement How to use sql if statement Apr 09, 2025 pm 06:12 PM

SQL IF statements are used to conditionally execute SQL statements, with the syntax as: IF (condition) THEN {statement} ELSE {statement} END IF;. The condition can be any valid SQL expression, and if the condition is true, execute the THEN clause; if the condition is false, execute the ELSE clause. IF statements can be nested, allowing for more complex conditional checks.

Unable to log in to mysql as root Unable to log in to mysql as root Apr 08, 2025 pm 04:54 PM

The main reasons why you cannot log in to MySQL as root are permission problems, configuration file errors, password inconsistent, socket file problems, or firewall interception. The solution includes: check whether the bind-address parameter in the configuration file is configured correctly. Check whether the root user permissions have been modified or deleted and reset. Verify that the password is accurate, including case and special characters. Check socket file permission settings and paths. Check that the firewall blocks connections to the MySQL server.

How to solve the 'Network Error' caused by Vue Axios across domains How to solve the 'Network Error' caused by Vue Axios across domains Apr 07, 2025 pm 10:27 PM

Methods to solve the cross-domain problem of Vue Axios include: Configuring the CORS header on the server side using the Axios proxy using JSONP using WebSocket using the CORS plug-in

How to efficiently obtain component_verify_ticket in EasyWechat 5.5? How to efficiently obtain component_verify_ticket in EasyWechat 5.5? Apr 01, 2025 pm 12:42 PM

Get ComponentVerify in EasyWechat5.5...

How to use Debian Apache logs to improve website performance How to use Debian Apache logs to improve website performance Apr 12, 2025 pm 11:36 PM

This article will explain how to improve website performance by analyzing Apache logs under the Debian system. 1. Log Analysis Basics Apache log records the detailed information of all HTTP requests, including IP address, timestamp, request URL, HTTP method and response code. In Debian systems, these logs are usually located in the /var/log/apache2/access.log and /var/log/apache2/error.log directories. Understanding the log structure is the first step in effective analysis. 2. Log analysis tool You can use a variety of tools to analyze Apache logs: Command line tools: grep, awk, sed and other command line tools.

Navicat connects to database error code and solution Navicat connects to database error code and solution Apr 08, 2025 pm 11:06 PM

Common errors and solutions when connecting to databases: Username or password (Error 1045) Firewall blocks connection (Error 2003) Connection timeout (Error 10060) Unable to use socket connection (Error 1042) SSL connection error (Error 10055) Too many connection attempts result in the host being blocked (Error 1129) Database does not exist (Error 1049) No permission to connect to database (Error 1000)

See all articles