Add List to a mysql parameter

Question

I have this question about the MySqlParameter from the .NET connector.

I have this query:

SELECT * FROM table WHERE id IN (@parameter)

Answer 1

I don't think there's a way you can add them like that, but perhaps you could iterate through the list and generate the query dynamically.

For example:

var intArray = new List(){1,2,3,4};
if (intArray.Count > 0) {
    var query = "SELECT * FROM table WHERE id IN (";
    for (int i = 0; i < intArray.Count; i++) {
        //Append the parameter to the query
        //Note: I'm not sure if mysql uses "@" but you can replace this if needed
        query += "@num" + i + ",";
        //Add the value to the parameters collection
        ...connection.Command.Parameters.AddWithValue("num" + i, intArray[i]);
    }
    //Remove the last comma and add the closing bracket
    query = query.Substring(0, query.Length - 1) + ");";
    //Execute the query here
}

This way, you could even use a differently typed list and still reap the benefits of parameterized queries. However, I don't know if there would be performance issues with larger lists but I suspect that would be the case.