c# - Add List<int> 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)

And the MySqlParameter is:

intArray = new List<int>(){1,2,3,4};

...connection.Command.Parameters.AddWithValue("parameter", intArray);

This is possible? Is possible to pass an array of int to a single MySqlParameter? The other solution will be convert the array of int to a string such like "1,2,3,4", but this, when i pass it to the MySqlParameter and this is recognized as a string, it puts in the sql query like "1,2,3,4" and this do not return the expected values.

@ UPDATE: Seems like the mysql connector team should work a little bit harder.

Answer 1

when i pass it to the MySqlParameter and this is recognized as a string, it puts in the sql query like "1,2,3,4" and this do not return the expected values.

I ran into this last night. I found that FIND_IN_SET works here:

SELECT * FROM table WHERE FIND_IN_SET(id, @parameter) != 0
...
intArray = new List<int>(){1,2,3,4};
conn.Command.Parameters.AddWithValue("parameter", string.Join(",", intArray));

Apparently this has some length limitations (I found your post looking for an alternate solution), but this may work for you.