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

Executing MySQL User Defined Variables with a .NET MySqlCommand

Executing MySQL user defined variables with a .NET MySqlCommand requires a modification to the connection string. To use user defined variables, the Allow User Variables option must be set to True.

SOLUTION:

To use a MySQL user defined variable in a .NET MySqlCommand, follow these steps:

1. Add the ;Allow User Variables=True option to the connection string:

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

2. Re-establish the connection to the database using the updated connection string.
3. Execute the query using the modified connection string.

EXAMPLE CODE:

$connectionstring = "Server=$server;Port=$port;Database=$DataBase;Uid=$User;Pwd=$Password;allow zero datetime=yes;Allow User Variables=True";
$conn = new-object MySql.Data.MySqlClient.MySqlConnection($connectionstring);
$conn.Open();

$sql = "SET @a = 1;SELECT @a;";
$cmd = new-object MySql.Data.MySqlClient.MySqlCommand($sql,$conn);
$ds = New-Object system.Data.DataSet;
$da = New-Object MySql.Data.MySqlClient.MySqlDataAdapter($cmd);
$da.fill($ds); 
$conn.close();
$ds.tables[0]

Note: This solution has been tested using version 6.3.6.0 of MySql.Data.

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