How to Execute 2 or more insert statements using CFQuery in coldfusion?

Question

Is it possible to Execute 2 insert or Update Statements using cfquery?

If yes how?

if no, what is the best way to execute multiple queries in Coldfusion, by opening only one Connection to DB.

I think every time we call cfquery we are opening new connection DB

Answer 1

Is it possible to Execute 2 insert or Update Statements using cfquery?

Most likely yes. But whether you can run multiple statements is determined by your database type and driver/connection settings. For example, when you create an MS SQL datasource, IIRC multiple statements are allowed by default. Whereas MySQL drivers often disable multiple statements by default. That is to help avoid sql injection. So in that case you must to enable multiple statements explicitly in your connection settings. Otherwise, you cannot use multiple statements. There are also some databases (usually desktop ones like MS Access) that do not support multiple statements at all. So I do not think there is a blanket answer to this question.

If the two insert/update statements are related, you should definitely use a cftransaction as Sam suggested. That ensures the statements are treated as a single unit: ie Either they all succeed or they all fail. So you are not left with partial or inconsistent data. In order to accomplish that, a single connection will be used for both queries in the transaction.

I think every time we call cfquery we are opening new connection DB

As Sam mentioned, that depends on your settings and whether you are using cftransaction. If you enable Maintain Connections (under Datasource settings in the CF Administrator) CF will maintain a pool of open connections. So when you run a query, CF just grabs an open connection from the pool, rather than opening a new one each time. When using cftransaction, the same connection should be used for all queries. Regardless of whether Maintain Connections is enabled or not.

Answer 2

Within the data source settings you can tell it whether to keep connections open or not with the Maintain Connections setting.

Starting with, I believe, ColdFusion 8 datasources are set up to run only one query at a time due to concerns with SQL injection. To change this you would need to modify with the connection string.

Your best bet is to turn on Maintain Connections and if needed use cftransaction:

<cftransaction>
<cfquery name="ins" datasource="dsn">
insert into table1 values(<cfqueryparam value="#url.x#">)
</cfquery>
<cfquery name="ins" datasource="dsn">
insert into table2 values(<cfqueryparam value="#url.x#">)
</cfquery>
</cftransaction>

And always, always use cfqueryparam for values submitted by users.

Answer 3

the mySQL driver in CF8 does now allow multiple statements. as Sam says, you can use to group many statements together or in the coldfusion administrator | Data & Services | Data sources, add allowMultiQueries=true to the Connection String field