Question

我的查询包含＆＃39; INSERT＆＃39;，＆＃39; DELETE＆＃39;并且＆＃39;更新＆＃39;声明。现在我的问题是＆＃34;如果任何其他声明失败，是否可能没有语句运行＆＃34;

$sql=" START Transaction INSERT statement; DELETE statement; UPDATE statement; COMMIT";

Answer 1

您必须使用MySQL transactions。如果出现问题（例如，您收到错误），它将允许您回滚所有更改（在事务中进行的更改）。

简单示例：

<?php 
$all_query_ok=true; // our control variable 
$mysqli = new mysqli("localhost", "user", "pass", "dbname");

/* check connection */
if (mysqli_connect_errno()) {
    printf("Connect failed: %s\n", mysqli_connect_error());
    exit();
}

/* disable autocommit */
$mysqli->autocommit(FALSE);

//we make 4 inserts, the last one generates an error 
//if at least one query returns an error we change our control variable 
$mysqli->query("INSERT INTO myCity (id) VALUES (100)") ? null : $all_query_ok=false; 
$mysqli->query("INSERT INTO myCity (id) VALUES (200)") ? null : $all_query_ok=false; 
$mysqli->query("INSERT INTO myCity (id) VALUES (300)") ? null : $all_query_ok=false; 
$mysqli->query("INSERT INTO myCity (id) VALUES (100)") ? null : $all_query_ok=false; //duplicated PRIMARY KEY VALUE 

//now let's test our control variable 
$all_query_ok ? $mysqli->commit() : $mysqli->rollback(); 

$mysqli->close(); 
?>

如果所有声明都成功，则运行查询

1 个答案: