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The author:(作者)delv
published in(发表于) 1/27/2014 6:47:49 AM
ASP.NET与数据库相关技巧_[Asp.Net教程]

一、取得数据表 i 行 j 列的值

//建立并打开数据库连接 

OleDbConnection conn=new OleDbConnection(); 

conn.ConnectionString=strConnectionString;//strConnectionString为数据库连接字符串 

conn.Open(); 

string sql="select * from NewsClass order by ClassId desc"; 

string x; 

DataSet ds=new DataSet(); 

OleDbDataAdapter da=new OleDbDataAdapter(sql,conn); 

da.Fill(ds,"NewsTable"); 

DataTable dt=ds.Tables["NewsTable"]; 

x=dt.Rows[i][1].ToString()//数据表i行j列的值 

conn.close(); 

二、将数据读入DropDownList

（1）DropDownList中添加数据

//建立并打开数据库连接 

OleDbConnection conn=new OleDbConnection(); 

conn.ConnectionString=strConnectionString;//strConnectionString为数据库连接字符串 

conn.Open(); 

string sql="select * from NewsClass order by ClassId desc"; 

//建立数据集 

DataSet ds=new DataSet(); 

OleDbDataAdapter da=new OleDbDataAdapter(sql,conn); 

da.Fill(ds,"NewsTable"); 

this.DropDownList1.DataSource=ds; 

this.DropDownList1.DataTextField = "ClassName";//Text值 

this.DropDownList1.DataValueField = "ClassID";//Value值 

this.DropDownList1.DataBind(); 

conn.Close(); 

（2）选中DropDownList的某项

this.DropDownList1.Items.FindByValue(dr["ClassID"].ToString().Trim()).Selected=true;
//dr为DataRow 

三、分类编码检索出相应的分类名称并在DataGrid中显示

（1）.ASPX中的代码（ClassID为分类编码）

 

 

Text='<%# GetClassName(Convert.ToInt32(DataBinder.Eval(Container, 
"DataItem.ClassID"))) %>'> 

 

 

 

（2）C#代码

/// 
 

/// "分类"列根据数字返回文字 

/// 

/// 

///  

public string GetClassName(int ClassID) 

{ 

OleDbConnection conn=new OleDbConnection(); 

conn.ConnectionString=strConnectionString; 

conn.Open(); 

string sql="select * from NewsClass where ClassID="+ClassID; 

DataSet ds=new DataSet(); 

OleDbDataAdapter da=new OleDbDataAdapter(sql,conn); 

da.Fill(ds,"ClassTable"); 

DataTable dt=ds.Tables["ClassTable"]; 

string strClassName=dt.Rows[0]["ClassName"].ToString(); 

conn.Close(); 

return strClassName;//返回 ClassID对应的ClassName 

} 

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