using System;
using System.Data;
using Zhaizj.Framework;
using Zhaizj.Framework.Data;
using Zhaizj.Framework.Log;

namespace Zhaizj.Framework.ORM.Operation {

    internal class CountOperation {

        private static readonly ILog logger = LogManager.GetLogger( typeof( CountOperation ) );

        public static int Count( Type t ) {
            return Count( t, "" );
        }

        public static int Count( Type t, String condition ) {
            return Count( condition, Entity.GetInfo( t ) );
        }

        private static int Count( String condition, EntityInfo entityInfo ) {
            String countSql;
            int result = 0;
            SqlBuilder builder = new SqlBuilder( entityInfo );
            if (strUtil.IsNullOrEmpty( condition )) {
                countSql = String.Format( "select count(*) from {0}", entityInfo.TableName );
            }
            else {
                countSql = builder.GetCountSql( condition );
            }
            logger.Info( LoggerUtil.SqlPrefix+"[Count(String condition) Sql]:" + countSql );
            IDbCommand command = DataFactory.GetCommand( countSql, DbContext.getConnection( entityInfo ) );
            try {
                result = cvt.ToInt( command.ExecuteScalar() );
            }
            catch (Exception exception) {
                logger.Error( exception.Message );
                throw exception;
            }

            return result;
        }


    }
}