How to use php to extend PDO to connect to Oracle database

How to use PHP to extend PDO to connect to Oracle database

Introduction: PHP is a very popular server-side programming language, and Oracle is a commonly used relational database management system. This article will introduce how to use the PHP extension PDO (PHP Data Objects) to connect to the Oracle database.

1. Install the PDO_OCI extension
To connect to the Oracle database, you first need to install the PDO_OCI extension. The following are the steps to install the PDO_OCI extension:

1. Make sure the Oracle client is installed.

2. Open the PHP configuration file php.ini, look for "extension=", uncomment the following two lines, and place them in the loading location of the relevant extension.

   extension=php_pdo.dll
   extension=php_pdo_oci.dll

3. Save and close the php.ini file.
4. Restart the web server.

2. Create PDO connection object
After successfully installing the PDO_OCI extension and restarting the server, we can start writing PHP code to connect to the Oracle database. The following is a sample code to create a PDO connection object:

$database_name = "//localhost/orcl"; //Database connection string, where localhost is the host name and orcl is the database Name
$username = "your_username"; //Replace with your own username
$password = "your_password"; //Replace with your own password

try {

$conn = new PDO("oci:dbname=" . $database_name, $username, $password);
echo "数据库连接成功！";

} catch (PDOException $e) {

echo "数据库连接失败：" . $e->getMessage();

}
?>

3. Execute SQL query
After successfully connecting to the Oracle database, we can execute SQL query. The following is a simple query example:

$database_name = "//localhost/orcl"; //Database connection string
$username = "your_username"; // Replace with your own username
$password = "your_password"; //Replace with your own password

try {

$conn = new PDO("oci:dbname=" . $database_name, $username, $password);
echo "数据库连接成功！<br>";

$stmt = $conn->prepare("SELECT * FROM employees WHERE department_id = :department_id");
$stmt->bindParam(':department_id', $department_id);
$department_id = 100;
$stmt->execute();

while ($row = $stmt->fetch(PDO::FETCH_ASSOC)) {
    echo "员工编号: " . $row['employee_id'] . ", 姓名: " . $row['first_name'] . " " . $row['last_name'] . "<br>";
}

} catch (PDOException $e) {

echo "数据库连接失败：" . $e->getMessage();

}
?>

In the above example, we used PDO's prepare() method to preprocess the SQL query, and used the bindParam() method to bind parameters. Then, we use the execute() method to execute the query and the fetch() method to obtain the query result set.

Conclusion:
This article introduces how to use PHP to extend PDO to connect to the Oracle database, and writes relevant sample code. By learning these codes, you can start using PHP to interact with Oracle databases. Hope this article helps you!

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