![]() ![]() It is because I used EF Core In-Memory to mock out the database. This also explains why unit tests did not catch this issue. npgsql detects that it is attempting to set the parameter of a property with DateTimeKind = Unspecified to timestamp with timezone.When we write that record back into the database, because Person.Dob is of type DateTime, npgsql set the corresponding to timestamptz (which is timestamp with timezone).Because the Dob column inside the database is timestamp without timezone, when npgsql retries that column, its DateTimeKind is set to Unspecified.And the default EF mapping for DateTime is timestamptz, not timestampįinally, I think I understood the chain of events that led to the error above. timestamptz) – is determined only by the CLR type of the parameter (DateTime), without looking at its contents (i.e. The EF type mapping – which manages the PG type of the parameter sent (timestamp vs. by setting NpgsqlDbType.TimestampTz on your parameter so the mismatch isn’t between the value and the column, but rather between the value and your parameter type.Īnd I found this question on Stackoverflow, which helped me fill in the rest. It says that you’ve asked Npgsql to send an Unspecified DateTime as a PG timestamptz type, e.g. The error message does not indicate that your PostgreSQL column type is wrong – Npgsql has no knowledge of the column type you’re inserting into, etc. Then I found some hints in this issue in the npgsql repository, in particular this comment. As we can see, the DateTimeKind of Dob is Unspecified, even though it is supposed to be Utc. This is the value of Dob from the record where Name = "Baby Doe". ![]() My first clue came from investigating a retrieved record from the database. This means they should have DateTime.Kind = DateTimeKind.Utc already. I made sure to always convert DateTime objects into Utc time before saving them into the database. I confirmed that the database is using timestamp without time zone. But that didn’t sound right for two reasons. At first glance, I thought I was writing a DateTimeKind.Local/DateTimeKind.Unspecified object into a timestamp with timezone column in the database. Conversely, we must map the type timestamp without timezone to a DateTime object with DateTime.Kind = DateTimeKind.Local (or DateTimeKind.Unspecified). If the type in the database is timestamp with timezone then we must map it to a DateTime object with DateTime.Kind = DateTimeKind.Utc on the C# side. One of the biggest changes in version 6.x is how timestamps are handled. NET 6, I upgraded the the npgsql efcore provider to the latest 6.x version. Why did we get a datetime error? A change in the LINQ providerĪs part of moving the project to. The Net6 project inside the sample solution contains the upgraded. ![]() dotnet runĪfter execution, we can verify that the NickName of Baby Doe has been updated. We run the following command from the Net3.1 folder. var baby = await (p => p.Name = "Baby Doe") As we can see here, our program simply updates the ![]() The Net3.1 project inside the sample solution contains the original. This will create a database with a very simple table called Person. Then you can run the following command in the DbSetup folder to restore the database (you might have to install the dotnet ef tool). Alternatively, you can install PostgreSQL database on your machine or use a remote server.Īfter your database is up and running, please update the connection string in this file with your database name, username, and password. The most simple way is to use a Docker image. To run the sample project, we need a PostgreSQL database. You can download the sample code from the link below. In today’s article, we will find the cause of this error, and try two solutions to fix it. Since all unit tests still passed, I was confused. See the Npgsql.EnableLegacyTimestampBehavior AppContext switch to enable legacy behavior. Note that it's not possible to mix DateTimes with different Kinds in an array/range. Cannot write DateTime with Kind=Unspecified to PostgreSQL type 'timestamp with time zone', only UTC is supported. The process went relatively smoothly, until a bunch of my integration tests started to fail with the following error. This project uses Entity Framework Core with the npgsql efcore provider to interact with a PostgreSQL database. Note: phiên bản Tiếng Việt của bài này ở link dưới. ![]()
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