How to use real-time data synchronization and replication of Oracle database in PHP

How to use real-time data synchronization and replication of Oracle database in PHP

In today's data-driven world, real-time data synchronization and replication are crucial to ensure the accuracy and consistency of data. In PHP development, using real-time data synchronization and replication of Oracle database can ensure that data between databases remains synchronized and provide high availability and high throughput. This article will introduce how to use real-time data synchronization and replication of Oracle database in PHP, and give corresponding code examples.

1. Configure database connection
First, we need to configure the connection between PHP and Oracle database. You can use the OCI8 extension library to achieve this functionality. The following is a sample code for connecting to the Oracle database:

<?php
$tns = "(DESCRIPTION=
        (ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST=your_host)(PORT=your_port)))
        (CONNECT_DATA=(SERVICE_NAME=your_service_name))
        )";

$conn = oci_connect('username', 'password', $tns);

if (!$conn) {
    $e = oci_error();
    trigger_error(htmlentities($e['message'], ENT_QUOTES), E_USER_ERROR);
}
?>

Where, 'your_host' is the host name of the Oracle database server, 'your_port' is the port number of the database server, 'your_service_name' is the database to be connected Service name, 'username' and 'password' are the username and password of the database respectively.

2. Real-time data synchronization
To realize real-time data synchronization, you can use the triggers and event queues of the Oracle database. The following is a sample trigger code for synchronizing data to the target database when changes occur in the source database:

<?php
CREATE OR REPLACE TRIGGER sync_trigger
AFTER INSERT OR UPDATE OR DELETE ON source_table
FOR EACH ROW
DECLARE
BEGIN
    IF INSERTING THEN
        enqueue_event('INSERT', :old.id, :old.column1, :old.column2);
    ELSIF UPDATING THEN
        enqueue_event('UPDATE', :new.id, :new.column1, :new.column2);
    ELSIF DELETING THEN
        enqueue_event('DELETE', :old.id, :old.column1, :old.column2);
    END IF;
END;
?>

In the above code, 'source_table' is the table name in the source database, the event type and the corresponding The data will be added to an event queue.

The following is a sample code for listening and processing data in the event queue on the target database:

<?php
while (1) {
    $data = dequeue_event();

    if ($data) {
        $event_type = $data['event_type'];
        $id = $data['id'];
        $column1 = $data['column1'];
        $column2 = $data['column2'];

        // 根据不同的事件类型进行处理
        // 可以执行相应的INSERT、UPDATE、DELETE操作或其他业务逻辑

        // ...

        // 提交事务
        oci_commit($conn);
    }

    // 等待一段时间继续监听事件队列
    sleep(1);
}
?>

In the above code, an infinite loop is used to continuously listen to the event queue. If there is data in the queue, the corresponding data will be taken out of the queue and processed accordingly.

3. Implement data replication
To achieve data replication, you can use the log mining function of the Oracle database. The following is a sample code to apply the logs of the source database to the target database to copy the data:

<?php
BEGIN
    DBMS_LOGMNR.START_LOGMNR(
        STARTSCN => your_start_scn,
        ENDSCN => your_end_scn,
        OPTIONS => DBMS_LOGMNR.COMMITTED_DATA_ONLY + DBMS_LOGMNR.SKIP_CORRUPTION
    );

    WHILE DBMS_LOGMNR.NEXT_LOGFILE LOOP
        -- 处理源数据库的日志
        -- 获取变更的数据并应用到目标数据库

        -- ...

        -- 提交事务
        oci_commit($conn);
    END LOOP;
END;
?>

In the above code, 'your_start_scn' and 'your_end_scn' are respectively the start of the log range to be applied SCN and end SCN.

4. Summary
In PHP development, using real-time data synchronization and replication of Oracle database can ensure that data between databases remains synchronized and provide high availability and high throughput. This article describes how to configure a database connection in PHP and gives code examples for real-time data synchronization and data replication. I hope that through the introduction of this article, readers can understand how to use real-time data synchronization and replication of Oracle database in PHP, and be able to apply and customize it according to their needs.

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