Migration concatenates strings that are escaped

[nicolaeburnariu]

Hi,

Recently we made the upgrade to EF 5.0. After the upgrade the migration is no working anymore and we get the error message "The concat function requires 2 to 254 arguments.". After some investigation we discover that at some point in the early migrations we had for seed data some escaped strings. From the logs we realise that the strings are split (by \n) and concatenated.

In the seed json we have something like:

[
 {
  "Id": 1,
  "Data": "{\r\n \"property\": \"value\" \r\n}" 
 }
]

In the migration file we will have something like:

migrationBuilder.InsertData(
                table: "TableName",
                columns: new[] { "Id", "Data" },
                values: new object[,]
                {
                    { 1, @"{ 
                    ""property"" : ""value""
                               }" },
                });

The sql code will look similar to:

INSERT INTO [TableName] ([Id],[Data])
VALUES (1, CONCAT(N'{', NCHAR(13), NCHAR(10), N'                  "property": "value", NCHAR(13), NCHAR(10), N'                }' )

For complex and long data we can easy reach the limit from error.

[sergtk]

I got the same error after update to .NET 5.0. As a workaround I replaced new lines with spaces in my seed data.
I also have json on input.

Anyway this is workaround which not always applicable, and it would be good to have a fix of the bug.

[ajcvickers]

@nicolaeburnariu Do you need the newlines in the inserted data? If not, the best thing to do is to strip them out while generating the C# code from the JSON? Also, we are curious what you have in the seed data that results in more than 254 concat arguments? Is this because you are storing large formatted JSON objects in the database?

[nicolaeburnariu]

@nicolaeburnariu Do you need the newlines in the inserted data? If not, the best thing to do is to strip them out while generating the C# code from the JSON?

No, we don't need the newlines, actually since that migration we already updated the seed data to not have any escaped characters. The migration file that is causing this error is an old migration that was generated long time ago. Probably we will try to remove the newlines from the autogenerated migration file, hope there will be no side effects.

Also, we are curious what you have in the seed data that results in more than 254 concat arguments? Is this because you are storing large formatted JSON objects in the database?

Yes, we have a fairly large JSON stored in the database and we use the migration the seed the default value.

[smitpatel]

CONCAT(NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), CONCAT(NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), 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NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10), NCHAR(13), NCHAR(10)))))))))