DataTable读取表的架构信息

using System;
using System.Data;
using System.Data.SqlClient;

namespace Northwind
{
    class Program
    {
        static void Main(string[] args)
        {
            SqlConnection sqlConn = null;
            SqlCommand sqlCmd = null;
            SqlDataReader sqlDR = null;
            try
            {
                //创建连接对象,使用集成安全方式连接，更安全
                sqlConn = new SqlConnection(@"data source=localhost;
                   Integrated Security=SSPI;Initial Catalog=northwind");
                //创建命令对象，参数1是存储过程名
                string strSql = @"select categoryid, categoryname from categories;"
                    + @"select employeeId, lastname from employees";
                sqlCmd = new SqlCommand(strSql, sqlConn);
     
                //打开数据库
                sqlConn.Open();
                //执行查询，并将结果集返回给SqlDataReader
                sqlDR = sqlCmd.ExecuteReader();

                //返回结果集中表的架构信息
                DataTable schemaTable = sqlDR.GetSchemaTable();
                //遍历所有的行，直到结束
                foreach (DataRow r in schemaTable.Rows)
                {
                    foreach (DataColumn c in schemaTable.Columns)
                        Console.WriteLine(c.ColumnName + "  =  " + r[c]);
                    Console.WriteLine();
                }
                /*
                do 
                {
                    Console.WriteLine(@"-------------------------------");
                    Console.WriteLine("{0, -15}{1,-15}", sqlDR.GetName(0),
                        sqlDR.GetName(1));
                    Console.WriteLine(@"-------------------------------");
                    while (sqlDR.Read())
                    {
                        Console.WriteLine("{0, -15}${1,-15}", sqlDR.GetInt32(0),
                        sqlDR.GetString(1));
                    }
                    Console.WriteLine();

                } while (sqlDR.NextResult());
                */
            }
            catch (System.Exception e)
            {
                Console.WriteLine(e.Message);
            }
            finally
            {
                //关闭SqlDataReader对象
                sqlDR.Close();
                //断开数据库连接
                sqlConn.Close();
            }

        }
    }
}

ColumnName  =  categoryid ColumnOrdinal  =  0 ColumnSize  =  4 NumericPrecision  =  10 NumericScale  =  255 IsUnique  =  False IsKey  = BaseServerName  = BaseCatalogName  = BaseColumnName  =  categoryid BaseSchemaName  = BaseTableName  = DataType  =  System.Int32 AllowDBNull  =  False ProviderType  =  8 IsAliased  = IsExpression  = IsIdentity  =  True IsAutoIncrement  =  True IsRowVersion  =  False IsHidden  = IsLong  =  False IsReadOnly  =  True ProviderSpecificDataType  =  System.Data.SqlTypes.SqlInt32 DataTypeName  =  int XmlSchemaCollectionDatabase  = XmlSchemaCollectionOwningSchema  = XmlSchemaCollectionName  = UdtAssemblyQualifiedName  = NonVersionedProviderType  =  8 IsColumnSet  =  False

ColumnName  =  categoryname ColumnOrdinal  =  1 ColumnSize  =  15 NumericPrecision  =  255 NumericScale  =  255 IsUnique  =  False IsKey  = BaseServerName  = BaseCatalogName  = BaseColumnName  =  categoryname BaseSchemaName  = BaseTableName  = DataType  =  System.String AllowDBNull  =  False ProviderType  =  12 IsAliased  = IsExpression  = IsIdentity  =  False IsAutoIncrement  =  False IsRowVersion  =  False IsHidden  = IsLong  =  False IsReadOnly  =  False ProviderSpecificDataType  =  System.Data.SqlTypes.SqlString DataTypeName  =  nvarchar XmlSchemaCollectionDatabase  = XmlSchemaCollectionOwningSchema  = XmlSchemaCollectionName  = UdtAssemblyQualifiedName  = NonVersionedProviderType  =  12 IsColumnSet  =  False

请按任意键继续. . .