I am using Npgsql 3.0.3.0 and PetaPoco latest version.
When I run this command:
var dateCreated = DateTime.Now; // just an example
var sql = new Sql("WHERE date_created = @0", dateCreated.ToString("yyyy-MM-dd HH:00:00"));
var category = db.SingleOrDefault<Category>(sql);
I get the following error:
Npgsql.NpgsqlException 42883: operator does not exist: timestamp without time zone = text
I understand the error message is saying I'm trying to compare a timestamp (date) with a text, however for me it's perfectly valid to compare them as I am expecting the following SQL statement to be built:
SELECT * FROM category WHERE date_created = '2017-02-03 15:00:00'
I don't really want to typecast my database column to text for performance reasons.
您需要将值转换为timestsamp:
var sql = new Sql("WHERE date_created = @0::timestamp", dateCreated.ToString("yyyy-MM-dd HH:00:00"));
You need to explicit typecast text to timestamp.
Try using :
TO_TIMESTAMP(date_string,'YYYY-MM-DD')
As @roman-tkachuk answered, you can tell PostgreSQL to cast your string into a timestamp.
Or better yet, you can simply send a timestamp to PostgreSQL directly, rather than sending a string representation of a timestamp and having it cast. To do that, simply send dateCreated
directly, without the ToString()
.
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