How to Access MySQL User-Defined Variables with .NET MySqlCommand?

Accessing MySQL User Defined Variables with .NET MySqlCommand

Using user-defined variables in MySQL statements is essential for various operations. However, when attempting to execute a statement like "SET @a = 1; SELECT @a;" with MySql.Data.MySqlClient, you may encounter an error.

To resolve this issue, you need to enable the use of user variables in the connection string. Add ";Allow User Variables=True" to the end of the connection string, as shown below:

$connectionstring = "Server=$Server;Port=$port;Database=$DataBase;Uid=$User;Pwd=$Password;allow zero datetime=yes;Allow User Variables=True"

This setting allows you to use user-defined variables as parameters in your SQL statements. Once you modify the connection string, you should be able to execute the desired SQL statement successfully.

Note that this solution has been tested with version 6.3.6.0 of MySql.Data. Different versions may require different approaches or additional configurations.

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