MSSQL获取表结构通用方法

#region 通用方法

        ///<summary>
        ///读取错误信息
        ///</summary>
        public string ErrorMessage { get; private set; }

        /// <summary>
        /// 获取数据库中的表清单
        /// </summary>
        private DataTable GetTableNameList
        {
            get { return SqlDatabase.OperateData("SELECT [Name] FROM SysObjects Where XType='U' and name <> N'sysdiagrams'  ORDER BY [Name]"); }
        }

        /// <summary>
        /// 获取数据库中的表清单和字段清单
        /// </summary>
        private DataTable GetTableNameAndColumnList
        {
            get
            {
                //频繁进行字符串拼接操作的时候推荐使用StringBuilder，因为它提供更优秀的性能
                var strSql = new StringBuilder();
                strSql.Append("SELECT     [Name],STUFF((SELECT ',' + CAST( '['+COLUMN_NAME+']' as varchar(50)) ");
                strSql.Append("FROM         INFORMATION_SCHEMA.COLUMNS  where (TABLE_NAME = [Name])  FOR XML PATH('')),1,1,'') as ColumnList ");
                strSql.Append("FROM         SysObjects ");
                strSql.Append("Where XType='U' and name <> N'sysdiagrams' ORDER BY [Name] ");
                return SqlDatabase.OperateData(strSql.ToString());
            }
        }

        /// <summary>
        /// 获取数据库中的表清单和字段清单
        /// </summary>
        /// <param name="strTableList">表清单</param>
        /// <returns></returns>
        private DataTable GetTableNameAndColumnsToInsert(string strTableList)
        {

                //频繁进行字符串拼接操作的时候推荐使用StringBuilder，因为它提供更优秀的性能
                var strSql = new StringBuilder();
                strSql.Append("SELECT     [Name],STUFF((SELECT ',' + CAST( '['+COLUMN_NAME+']' as varchar(200)) ");
                strSql.Append("FROM         INFORMATION_SCHEMA.COLUMNS  where (TABLE_NAME = [Name])  FOR XML PATH('')),1,1,'') as ColumnList ");
                strSql.Append("FROM         SysObjects ");
                strSql.Append(string.Format("Where XType='U' and [Name] <> N'sysdiagrams' and ([Name] in ({0}) ) ORDER BY [Name] ", strTableList));
                return SqlDatabase.OperateData(strSql.ToString());
            
        }

        /// <summary>
        /// 获取数据库中的表清单和字段清单
        /// </summary>
        /// <param name="strTableList">表清单</param>
        /// <returns></returns>
        private DataTable GetTableNameAndColumnsToUpdate(string strTableList)
        {

            //频繁进行字符串拼接操作的时候推荐使用StringBuilder，因为它提供更优秀的性能
            var strSql = new StringBuilder();
            strSql.Append("SELECT     [Name],STUFF((SELECT ',' + CAST( '['+COLUMN_NAME+']' + '=SourceTable_1.'+'['+COLUMN_NAME+']'  as varchar(200)) "); 
            strSql.Append("FROM         INFORMATION_SCHEMA.COLUMNS  where (TABLE_NAME = [Name]) and COLUMN_NAME <> 'Id'  FOR XML PATH('')),1,1,'') as ColumnList "); 
            strSql.Append("FROM         SysObjects ");
            strSql.Append(string.Format("Where XType='U' and [Name] <> N'sysdiagrams' and ([Name] in ({0}) ) ORDER BY [Name] ", strTableList));
            return SqlDatabase.OperateData(strSql.ToString());

        }

        /// <summary>
        /// 获取指定表的列信息
        /// </summary>
        /// <param name="strTableName">表名</param>
        /// <returns></returns>
        private DataTable GetTableColumns(string strTableName)
        {
            //频繁进行字符串拼接操作的时候推荐使用StringBuilder，因为它提供更优秀的性能
            var strSql = new StringBuilder();
            strSql.Append("SELECT     COLUMN_NAME, ORDINAL_POSITION, DATA_TYPE, CHARACTER_MAXIMUM_LENGTH ");
            strSql.Append("FROM         INFORMATION_SCHEMA.COLUMNS ");
            strSql.Append("WHERE     (TABLE_NAME = @TableName) ");
            var htCols = new Hashtable
                             {
                                 //表名称
                                 {"TableName", strTableName}
                             };
            return SqlDatabase.OperateData(CommandType.Text, strSql.ToString(), htCols);

        }

        #endregion