ado|数据
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