How to use MySQL user-variables with ADO.NET

问题

MySQL SQL commands can contain user variables that start with '@'.

The MySQL ADO.NET connector also uses '@' for command parameters.

Is there a way to escape the '@' character so I can use a user-variable in an SQL statement sent to MySQL via ADO.NET?

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I'm trying to do something like this:

UPDATE company 
    SET next_job_id = @jobid:=next_job_id+1 
    WHERE company_id = @companyid; 
SELECT @jobid;

Where @jobid is a MySQL user variable and @companyid is a parameter.

回答1:

It's a connection string option - "Allow User Variables=true"

When set to true, parameters are prefixed with '?'.

Update: I've written up more on this, including how to get this to work with ADO.NET and Subsonic. See Here.

来源：https://stackoverflow.com/questions/4929792/how-to-use-mysql-user-variables-with-ado-net