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Any difference between :param and @param? #825

h1112918 opened this issue Oct 16, 2015 · 1 comment

Any difference between :param and @param? #825

h1112918 opened this issue Oct 16, 2015 · 1 comment


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There are two ways to add parameters:

command.CommandText = "SELECT * FROM mytable WHERE Id = :Id";
command.Parameters.AddWithValue("Id", id);


command.CommandText = "SELECT * FROM mytable WHERE Id = @Id";
command.Parameters.AddWithValue("@Id", id);

Is there any difference in both methods in performance or something else? I also think the difference (if any) should be mentioned in the project Wiki.

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roji commented Oct 16, 2015

There are no differences whatsoever between the two, Npgsql parses the command text and replaces them with PostgreSQL's native parameter placeholders, which are positional and not named ($1, $2).

@roji roji closed this as completed Oct 16, 2015
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