Dreamweaver CMS database connection exception: troubleshooting and repair guide

DreamWeaver CMS (DedeCMS) is a powerful content management system that is widely used in the construction and management of various websites. However, in the process of using this system, you sometimes encounter database connection exceptions, which may cause the website to be unable to access or operate normally. This article will provide troubleshooting and repair guidelines for the abnormal situation of Dreamweaver CMS database connection, and will attach specific code examples to help users better solve such problems.

1. Abnormal performance

When a database connection abnormality occurs in DreamWeaver CMS, it usually manifests itself in one of the following situations:

1. The website cannot be accessed normally , a database connection error prompt page appears;
2. The website background cannot be logged in, prompting a database connection error or unable to connect to the database;
3. The website data cannot be displayed correctly, or the database operation fails.

2. Troubleshooting steps

Step 1: Check the database configuration

First, open the configuration file of DreamWeaver CMSconfig .cache.php, confirm whether the database configuration information is correct. Make sure the following parameters are set correctly:

$db_host = 'localhost'; // 数据库主机
$db_user = 'root'; // 数据库用户名
$db_pass = 'password'; // 数据库密码
$db_name = 'database'; // 数据库名称

If the database configuration information is correct but you still cannot connect to the database, you can continue with the following troubleshooting steps.

Step 2: Check the database connection code

In the code of DreamWeaver CMS, the database connection is usually at data/common.inc.php file. Find the following code segment:

$link = @mysql_connect($db_host, $db_user, $db_pass) or die('Could not connect: ' . mysql_error());
mysql_select_db($db_name) or die('Could not select database');
mysql_query("SET NAMES 'utf8'");

Confirm whether the database connection information in the above code is consistent with the configuration file. If it is inconsistent, it needs to be modified.

Step 3: Troubleshoot database access permission issues

Sometimes, database exceptions may be caused by insufficient database access permissions. You can log in to the MySQL database management tool and check whether the corresponding database user has the correct permissions. Execute the following statement on the MySQL command line:

GRANT ALL PRIVILEGES ON database.* TO 'username'@'localhost' IDENTIFIED BY 'password';

3. Repair example

Assume that our database configuration is as follows:

$db_host = 'localhost';
$db_user = 'root';
$db_pass = 'password';
$db_name = 'dedecms';

According to the above troubleshooting steps, we found that the database configuration is correct , the database connection code is also correct. But you still cannot connect to the database. At this time, you can try the following repair code:

$mysqli = new mysqli($db_host, $db_user, $db_pass, $db_name);

if ($mysqli->connect_error) {
    die('Connect Error (' . $mysqli->connect_errno . ') ' . $mysqli->connect_error);
}

$mysqli->set_charset("utf8");

Replace the above repair code with the original database connection code, and try to access the website or backend again to see if the problem is solved.

Conclusion

DreamWeaver CMS database connection exception may be caused by various reasons such as configuration errors, code problems or insufficient database permissions. Through the above troubleshooting steps and repair examples, we hope to help users quickly solve this type of problem and ensure the normal operation of the website. Hope this article is helpful to you.

The above is the detailed content of Dreamweaver CMS database connection exception: troubleshooting and repair guide. For more information, please follow other related articles on the PHP Chinese website!