在数据库PHP中一次插入两个表

Question

I just wondering if there is a possibility to insert into the database two tables at once like,

$query = sprintf("INSERT INTO table ('tableid')values('somevaleu'),INSET INTO table1 ('table1id')values('somevalue')");

or I need to do it separately like,

$query1 = sprintf("INSERT INTO table ('tableid')values('somevaleu')");
$query2 = sprintf("INSET INTO table1 ('table1id')values('somevalue')");

Any suggestions?

Answer 1

If you are using the old mysql extension ( mysql_* functions), then you cannot issue multiple queries in one statement.

From the manual ¹ :

mysql_query() sends a unique query (multiple queries are not supported) to the currently active database on the server that's associated with the specified link_identifier.

If you were using mysqli or pdo mysql then you can do multiple inserts in one query.

It would also be possible to insert multiple rows into the same table in one query using extended inserts, but not two different tables.

Answer 2

Why are you trying to do this? If it's just laziness, please just take the extra thirty seconds and use two separate statements. If, OTOH, you want to do this because you need to make both inserts at the same time to keep your database consistent (eg updating an "orders" table and a "billing" table at the same time), you want to look into transactions .

Basically, a transaction (started with BEGIN ) is a bunch of queries that get bundled together and, when you're done, you can either COMMIT and make them stick or ROLLBACK to throw them away (such as if there's an error and you want to abort the process). They're not exactly executed at the same time but, on a COMMIT, they will either all succeed or none of them will go through.

Answer 3

You can use begin to enclose multiple SQL statements:

$query = "BEGIN ";
$query .= "INSERT INTO table ('tableid')values('somevalue') INSERT INTO table1 ('table1id')values('somevalue') ";
$query .= "COMMIT";

Then run $query .

Answer 4

It depends on how your database is being queried. A lot of the 3rd-party database abstraction libraries I've used only allow one SQL statement per execution. But MySQL can accept multiple queries separated by a semicolon, as you propose.