如何在PHP中使用Oracle数据库的实时数据同步和复制

<?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);
}
?>

<?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;
?>

<?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);
}
?>

<?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;
?>