How does DreamWeaver CMS implement database access?

Dreamweaver CMS is an open source content management system developed based on PHP language and is widely used in the field of website construction. In the process of website development, database access is a very important link, which involves operations such as storage, reading and updating of website data. Next, we will discuss how to implement database access in DreamWeaver CMS and provide some specific code examples to help readers understand better.

In DreamWeaver CMS, database access is mainly achieved through the MySQL database. Generally speaking, database operations can be divided into several main aspects such as adding data, deleting data, modifying data and querying data. The following are some common database operation examples:

1. Connect to the database
   In DreamWeaver CMS, you can use the mysql_connect function provided by the system to connect to the database. The sample code is as follows:

   $conn = mysql_connect('localhost', 'username', 'password');
   if(!$conn) {
    die('Could not connect: ' . mysql_error());
   }
   mysql_select_db('database_name', $conn);

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2. Insert data
   You can use the mysql_query function to insert data into the database. The sample code is as follows:

   $name = 'John';
   $age = 25;
   $sql = "INSERT INTO users (name, age) VALUES ('$name', $age)";
   if(mysql_query($sql, $conn)) {
    echo 'Data inserted successfully.';
   } else {
    echo 'Error: ' . mysql_error();
   }

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3. Delete data
   Use the DELETE statement to delete data in the database. The sample code is as follows:

   $id = 1;
   $sql = "DELETE FROM users WHERE id = $id";
   if(mysql_query($sql, $conn)) {
    echo 'Data deleted successfully.';
   } else {
    echo 'Error: ' . mysql_error();
   }

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4. Update data
   Use the UPDATE statement to update the data in the database. The sample code is as follows:

   $id = 1;
   $newAge = 30;
   $sql = "UPDATE users SET age = $newAge WHERE id = $id";
   if(mysql_query($sql, $conn)) {
    echo 'Data updated successfully.';
   } else {
    echo 'Error: ' . mysql_error();
   }

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5. Query data
   You can use the SELECT statement to query data in the database. The sample code is as follows:

   $result = mysql_query("SELECT * FROM users", $conn);
   while($row = mysql_fetch_array($result)) {
    echo 'Name: ' . $row['name'] . ', Age: ' . $row['age'] . '<br/>';
   }

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The above are some common operation examples for database access in DreamWeaver CMS. In actual development, it is necessary to choose the appropriate operation method according to specific needs, and pay attention to the safety and efficiency of database operations. I hope the above examples can help readers better understand how to access databases in Dreamweaver CMS.

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