Question

How can I validate sql scripts before executing them using .net 2.0 and c#?

If the sql is not valid I want to return error rows.

Answer 1

If you are creating a tool that allows the user enter some sql code by hand and you want to validate the code entered using C# code before execution on sql server, you can create a method like this:

using Microsoft.Data.Schema.ScriptDom;
using Microsoft.Data.Schema.ScriptDom.Sql;

public class SqlParser
{
        public List<string> Parse(string sql)
        {
            TSql100Parser parser = new TSql100Parser(false);
            IScriptFragment fragment;
            IList<ParseError> errors;
            fragment = parser.Parse(new StringReader(sql), out errors);
            if (errors != null && errors.Count > 0)
            {
                List<string> errorList = new List<string>();
                foreach (var error in errors)
                {
                    errorList.Add(error.Message);
                }
                return errorList;
            }
            return null;
        }
}

As of 2018 and new database versions, this might be newer version:

using Microsoft.SqlServer.TransactSql.ScriptDom;

(download with npm: PM> Install-Package Microsoft.SqlServer.TransactSql.ScriptDom -Version 14.0.3811.1 )

public bool IsSQLQueryValid(string sql, out List<string> errors)
{
    errors = new List<string>();
    TSql140Parser parser = new TSql140Parser(false);
    TSqlFragment fragment;
    IList<ParseError> parseErrors;

    using (TextReader reader = new StringReader(sql))
    {
        fragment = parser.Parse(reader, out parseErrors);
        if (parseErrors != null && parseErrors.Count > 0)
        {
            errors = parseErrors.Select(e => e.Message).ToList();
            return false;
        }
    }
    return true;
}