使用DataReader的GetSchemaTable()方法可以获得数据表中包含的结构信息,此方法返回一个DataTable,DataTable中的每一行(Row)的ColumnName属性值即为数据表的一个字段名。
SqlConnection coreDB=new SqlConnection(); coreDB.ConnectionString= "workstation id=\"GQA-ERIC-LV\";packet size=4096;integrated security=SSPI;" + "data source=\"gqa-eric-lv\";persist security info=False;initial catalog=CoreDB";
string mySelectQuery = "SELECT ID, Title FROM myBBS order by id asc"; SqlCommand myCommand = new SqlCommand(mySelectQuery,coreDB); coreDB.Open(); SqlDataReader myReader=myCommand.ExecuteReader();
//将数据库定义的信息保存到表SchemaTable中: DataTable SchemaTable=myReader.GetSchemaTable(); //表SchemaTable的每一行表示数据库表一个字段的信息: Response.Write("<table border=1 align=center><tr>"); foreach(DataRow myRow in SchemaTable.Rows) { Response.Write("<td>"); Response.Write(myRow["ColumnName"]); Response.Write("</td>"); } Response.Write("</tr>"); while(myReader.Read()) { Response.Write("<tr>"); Response.Write("<td>"+myReader["ID"].ToString()+"</td>"); Response.Write("<td><a href=query.aspx?id="+myReader["ID"]+">"+myReader["title"].ToString()+"</a></td>"); Response.Write("</tr>"); } Response.Write("</table>"); myReader.Close(); coreDB.Close();
显示的结果如图:
以上亦例示了SqlConnection,SqlCommand,DataReader的使用。
数据库coreDB中的表myBBS定义如下: if exists (select * from dbo.sysobjects where id = object_id(N''''[dbo].[myBBS]'''') and OBJECTPROPERTY(id, N''''IsUserTable'''') = 1) drop table [dbo].[myBBS] GO
CREATE TABLE [dbo].[myBBS] ( [ID] [bigint] IDENTITY (1, 1) NOT NULL , [Title] [char] (160) COLLATE Chinese_PRC_CI_AS NULL , [Author] [char] (20) COLLATE Chinese_PRC_CI_AS NULL , [Date_of_Created] [datetime] NULL , [Abstract] [char] (480) COLLATE Chinese_PRC_CI_AS NULL , [Content] [ntext] COLLATE Chinese_PRC_CI_AS NOT NULL ) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY] GO
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