.Net Connector for MySQL-参数

Question

I have a datatable, containing two rows: id char(9), eh char(4). Both rows contains numeric values (I can't change this), for example 123456789.

The query SELECT id,eh FROM tab WHERE id LIKE '123456789' directly in the MySQL-client works fine, in VB.net too.

But if I use a parameter in VB.net instead of building the query-string, the query returns null rows. This is what I've done (not the complete code):

Dim com As New MySqlCommand
com.CommandText = "SELECT id,eh FROM tab WHERE id LIKE @i"
com.Parameters.Add("@i", MySqlDbType.VarChar)
com.Parameters("@i").Value = number

I think, the connector does not send the quotes of the string (maybe because there are only numbers), because if I change the first query in the MySQL-client to ... LIKE 123456789, I get null rows, too.

Do you have any hints or workarounds for me?

Answer 1

Try

MySqlDbType.String

As your parameter type.

Note.. I do not use MySql but a quick google came up with char as a string.

EDIT

Maybe you are missing the Apostrophes around you @i

com.CommandText = "SELECT id,eh FROM tab WHERE id LIKE '@i'"