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  • sql解析

    http://social.msdn.microsoft.com/Forums/en-US/sqlnetfx/thread/fbcb255f-bcb7-45d8-9991-270a329b3d51/

    using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Text;
    using Microsoft.Data.Schema.ScriptDom;
    using Microsoft.Data.Schema.ScriptDom.Sql;
    using System.IO;

    namespace ConsoleApplication27
    {
        class SqlPareCenter
        {
            TSql100Parser parser;

            public SqlPareCenter()
            {
                parser = new TSql100Parser(false);
            }

            public List<FieldInfo> GetSQLFields(string query)
            {
                IList<ParseError> errors;
                IScriptFragment result = parser.Parse(new StringReader(query), out errors);
                List<FieldInfo> list = new List<FieldInfo>();

                TSqlStatement statement = ((TSqlScript)result).Batches[0].Statements[0];

                foreach (var item in (((QuerySpecification)((SelectStatement)statement).QueryExpression).SelectElements))
                {
                    SelectColumn c = (SelectColumn)item;

                    string alias = c.ColumnName == null ? "" : GetStringFromTSqlFragment(query, c.ColumnName);
                    string express = GetStringFromTSqlFragment(query, item);
                    list.Add(new FieldInfo() { Alias = alias, Express = express });
                    Console.WriteLine(alias + " : " + express);

                    //Console.WriteLine(GetStringFromTSqlFragment(query, item) + " Alias: " + (c.ColumnName == null ? "" : GetStringFromTSqlFragment(query, c.ColumnName)));
                }
                return list;

            }

            private string GetStringFromTSqlFragment(string wholeStatementString, TSqlFragment fragment)
            {
                return wholeStatementString.Substring(fragment.StartOffset, fragment.FragmentLength);
            }
        }
    }

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  • 原文地址:https://www.cnblogs.com/mingyongcheng/p/3123655.html
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