command/// <summary>
        /// 获取存储过程的相关表的列名和isnuable
        /// </summary>
        /// <param name="spid">存储过程名称</param>
        /// <returns>Hastable</returns>
        public Hashtable SPDependonTable(Int32 spid)
        {            
            try
            {
                //验证连接
                if(conn!=null && conn.State!=ConnectionState.Open)
                {
                    conn.Open();
                }
                else
                {
                    conn= new SqlConnection(this.connectionString);
                    conn.Open();
                }
                string sqlstr="SELECT name, isnullable as allowNUll FROM dbo.syscolumns WHERE (id IN (SELECT DISTINCT id FROM dbo.sysobjects WHERE (id IN (SELECT DISTINCT dbo.sysdepends.depid FROM dbo.sysdepends WHERE (dbo.sysdepends.id ="+spid+")))))";
                //获取相关表的isnullable
                SqlDataAdapter comm= new SqlDataAdapter(sqlstr,conn );
                DataSet depds=new DataSet();
                comm.Fill(depds,"dbo.syscolumns");
                Hashtable dependtbl=new Hashtable();
                //建立Hashtble
                for(int n=0;n<depds.Tables[0].Rows.Count;n++)
                {
                    string keyname=""+depds.Tables["dbo.syscolumns"].Rows[n]["name"];
                    Boolean isnullabled=Convert.ToBoolean( depds.Tables["dbo.syscolumns"].Rows[n]["allowNull"]);
                    dependtbl.Add(keyname,isnullabled);
                }
                
                return dependtbl;
            }
            catch(SqlException se)
            {
                throw(se);
            }
            catch(Exception e)
            {
                throw(e);
            }
            finally
            {
                if(conn.State ==ConnectionState.Open)
                {
                    conn.Close();
                }
            }
        }
        /// <summary>
        /// 获得指定表的所有字段对象
        /// </summary>
        /// <param name="TableName">表名</param>
        /// <returns>System.Data.DataTable</returns>
        public DataTable GetFields(String TableName)
        {
            try
            {                
                DataSet myDataSet=new DataSet();
                //验证连接
                if(conn!=null && conn.State!=ConnectionState.Closed)
                {
                    conn.Open();
                }
                else
                {
                    conn= new SqlConnection(this.connectionString);
                    conn.Open();
                }
                SqlDataAdapter comm= new SqlDataAdapter("SELECT * from "+TableName,conn);
            
                comm.FillSchema(myDataSet, SchemaType.Mapped,TableName);
                        
                return myDataSet.Tables[0];
            }
            catch(SqlException se)
            {
                throw(se);
            }
        }
        /// <summary>
        ///私有: 获取数据类型(DbType)
        /// </summary>
        /// <param name="typename">数据类型名称</param>
        /// <returns>DbType</returns>
        private DbType getDbType(string typename)
        {
            //DbType t;
            #region switch datatype
            switch(typename)
            {
                    //int64
                case "bigint":                    
                    return DbType.Int64;
                    //break;
                    //int32
                case "int":                
                    return DbType.Int32;
                    //break;
                    //int16                        
                case "smallint":                    
                    return DbType.Int16;
                    //break;
                    //byte
                case "binary":
                    return DbType.Byte;
                    //break;
                case "image":                    
                    return DbType.Byte;
                    //break;
                case "varbinary":                                        
                    return DbType.Byte;
                    //break;
                case "tinyint":
                    return DbType.Byte;
                    //break;
                    //boolean
                case "bit":
                    return DbType.Boolean;
                    //break;
                    //string
                case "varchar":
                    return DbType.String;
                    //break;
                case "text":
                    return DbType.String;
                    //break;
                case "nvarchar":
                    return DbType.String;
                    //break;
                case "ntext":
                    return DbType.String;
                    //break;
                case "nchar":
                    return DbType.String;
                    //break;
                case "char":
                    return DbType.String ;
                    //break;
                    //DateTime
                case "datetime":
                    return DbType.DateTime;
                    //break;
                case "smalldatetime":
                    return DbType.DateTime;
                    //break;
                case "timestamp":
                    return DbType.DateTime;
                    //break;
                    //double
                case "Float":
                    return DbType.Double;
                    //break;
                    //decimal
                case "decimal":
                    return DbType.Decimal;
                    //break;                    
                case "money":
                    return DbType.Decimal ;
                    //break;
                case "smallmoney":
                    return DbType.Decimal;
                    //break;                    
                default:
                    return DbType.Object;
                    //break;
            }
                        #endregion
            
        }
        /// <summary>
        /// 获取数据类型(SqlDbType)
        /// </summary>
        /// <param name="typename">数据类型名称</param>
        /// <returns>SqlDbType</returns>
        public SqlDbType getSqlDbType(string typename)
        {
            //SqlDbType t;
            #region switch datatype
            switch(typename)
            {
                    //int64
                case "bigint":
                    return SqlDbType.BigInt;
                    //break;
                    //int32
                case "int":
                    return SqlDbType.Int;
                    //break;
                    //int16                        
                case "smallint":
                    return SqlDbType.SmallInt;
                    //break;
                    //byte
                case "binary":
                    return SqlDbType.Binary;
                    //break;
                case "image":
                    return SqlDbType.Image;
                    //break;
                case "varbinary":                    
                    return SqlDbType.VarBinary;
                    //break;
                case "tinyint":
                    return SqlDbType.TinyInt;
                    //break;
                    //boolean
                case "bit":
                    return SqlDbType.Bit;
                    //break;
                    //string
                case "varchar":
                    return SqlDbType.VarChar;
                    //break;
                case "text":
                    return SqlDbType.Text;
                    //break;
                case "nvarchar":
                    return SqlDbType.NVarChar;                    
                    //break;
                case "ntext":
                    return SqlDbType.NText ;                    
                    //break;
                case "nchar":
                    return SqlDbType.NChar;                    
                    //break;
                case "char":
                    return SqlDbType.Char;                    
                    //break;
                    //DateTime
                case "datetime":
                    return SqlDbType.DateTime;                     
                    //break;
                case "smalldatetime":
                    return SqlDbType.SmallDateTime;                     
                    //break;
                case "timestamp":
                    return SqlDbType.Timestamp;                     
                    //break;
                    //double
                case "Float":
                    return SqlDbType.Float;
                    //break;
                    //decimal
                case "decimal":
                    return SqlDbType.Decimal;                    
                    //break;                    
                case "money":
                    return SqlDbType.Money;                    
                    //break;
                case "smallmoney":
                    return SqlDbType.SmallMoney;                     
                    //break;                    
                default:
                    return SqlDbType.Variant;                    
                    //break;
            }
                        #endregion
            
        }
        #endregion
    }
}