Question

I have a multi-megabyte .sql file, there are GO statements on newlines every 10k or so. I am trying to come up with a way to read the file, line-by-line, until I hit a new line that only has “go” and a Newline character, then return what was read to the caller, and then read the next bunch of text until I hit GO again.

Peek only lets me read one character, what’s a smart way to make this work in C# on Framework 4.0?

Thanks.

Answer 1

This should do exactly what you were saying.
Call this function with a string of the filename of the SQL file, and it will return an IEnumerable<string> (a bunch of strings) that each hold a SQL batch (each up until a GO statement) which you can then loop through with foreach or anything else.

public static IEnumerable<string> GetSqlBatches(string filename)
{
    using(StreamReader sr = new StreamReader(filename))
    {
        StringBuilder ReadSoFar = new StringBuilder();

        while (!sr.EndOfStream)
        {
            string line = sr.ReadLine();
            ReadSoFar.AppendLine(line);
            if (line.Trim() == "GO")
            {
                yield return ReadSoFar.ToString();
                ReadSoFar = new StringBuilder();
            }
        }
        sr.Close();
    }
}