Обсуждение: Question Regarding COPY Command Handling of Line Breaks in PostgreSQL

The cause has been identified. In my VB program, I was using the COPY command. 

To prevent memory issues with large files, I changed the file reading method from reading the entire file at once to reading it line by line, as shown below. 

However, this caused line breaks within the data to be lost. This is not an issue with the COPY command itself. 

I tested reading the entire file at once, and it worked without any problems. My apologies for the confusion.

Reading the entire file at once:

Using reader As New StreamReader(inputFile, System.Text.Encoding.UTF8)

    Using copyIn = conn.BeginTextImport("COPY Schema.tableName FROM STDIN WITH CSV HEADER")

        copyIn.Write(reader.ReadToEnd())

    End Using

End Using

Reading the file line by line:

Using reader As New StreamReader(inputFile, System.Text.Encoding.UTF8)

    Using copyIn = conn.BeginTextImport("COPY Schema.tableName FROM STDIN WITH CSV HEADER")

        While Not reader.EndOfStream

            Dim line As String = reader.ReadLine()

            copyIn.Write(line & vbLf)

        End While

    End Using

End Using