Sub LoadCommandList()
End Sub 二 Asp.net连接SQL Server2000数据库例程详解: <%@ Import Namespace="System.Data" %> <%@ Import NameSpace="System.Data.SqlClient" %> <script laguage="VB" runat="server"> sub page_load(sender as Object,e as EventArgs) Dim myConnection As SqlConnection Dim myCommand As SqlCommand Dim ds as DataSet '1.连接数据库 myConnection = New SqlConnection( "server=localhost;database=Pubs;uid=ueytjdf;pwd=doekdf" ) myConnection.Open() la1.text="Connection Opened!" '2.建立一个新表 myCommand = New SqlCommand( "CREATE TABLE [test] ([id] [int] IDENTITY (1, 1) NOT NULL ,[name] [char] (10) COLLATE Chinese_PRC_CI_AS NULL ,[sex] [char] (10) COLLATE Chinese_PRC_CI_AS NULL )", myConnection ) myCommand.ExecuteNonQuery() la2.text="New table created!" '2 添加纪录 myCommand = New SqlCommand( "Insert into [test] (name,sex) values( '黄志文','男' )", myConnection ) myCommand.ExecuteNonQuery() la3.text="New Record Inserted!" '3 更新数据 myCommand = New SqlCommand( "UPDATE [test] SET name='Smith' where name='李明'", myConnection ) myCommand.ExecuteNonQuery() la4.text="Record Updated!" '4 删除数据 myCommand = New SqlCommand( "delete from [test] where name='Smith'", myConnection ) myCommand.ExecuteNonQuery() la5.text="Record Deleted!" '5 用DataGrid显示数据 myCommand = New SqlCommand( "select * from [test]", myConnection ) MyDataGrid.DataSource=myCommand.ExecuteReader() MyDataGrid.DataBind() end sub </script> <html> <body> <asp:label id="la1" runat="server" /><br> <asp:label id="la2" runat="server" /><br> <asp:label id="la3" runat="server" /><br> <asp:label id="la4" runat="server" /><br> <asp:label id="la5" runat="server" /><br> <ASP:DataGrid id="MyDataGrid" runat="server" BorderColor="black" BorderWidth="1" GridLines="Both" CellPadding="3" CellSpacing="0" Font-Name="Verdana" Font-Size="10pt" HeaderStyle-BackColor="#aaaadd" AlternatingItemStyle-BackColor="#eeeeee" > </asp:DataGrid> </body> </html> ---------------------------------------------------------------------------------------------------- ASP.net连接access数据库例程 <%@ Import Namespace="System.Data" %> <%@ Import NameSpace="System.Data.OleDb" %> <script laguage="VB" runat="server"> Dim myConnection As OleDbConnection Dim myCommand As OleDbCommand sub page_load(sender as Object,e as EventArgs) '1.连接数据库 dim dbname as string dbname=server.mappath("authors.mdb") myConnection = New OleDbConnection( "PROVIDER=Microsoft.Jet.OLEDB.4.0;DATA Source="&dbname ) myConnection.Open() la1.text="Connection Opened!" '2.添加记录 myCommand = New OleDbCommand( "Insert INTO Authors(Authors,country) Values('Simson','usa')", myConnection ) myCommand.ExecuteNonQuery() la2.text="New Record Inserted!" '3 更新数据(Access) myCommand = New OleDbCommand( "UPDATE Authors SET Authors='Bennett' WHERE Authors = 'Simson'", myConnection ) myCommand.ExecuteNonQuery() la3.text="Record Updated!" '4 删除数据(access) myCommand = New OleDbCommand( "DELETE FROM Authors WHERE Authors = 'David'", myConnection ) myCommand.ExecuteNonQuery() la4.text="Record Deleted!" '5 使用DateGrid显示数据 myCommand = New OleDbCommand( "select * FROM Authors", myConnection ) MyDataGrid.DataSource=myCommand.Executereader() MyDataGrid.DataBind() end sub </script> <html> <body> <asp:label id="la1" runat="server" /><br> <asp:label id="la2" runat="server" /><br> <asp:label id="la3" runat="server" /><br> <asp:label id="la4" runat="server" /><br> <ASP:DataGrid id="MyDataGrid" runat="server" BorderColor="black" BorderWidth="1" GridLines="Both" CellPadding="3" CellSpacing="0" Font-Name="Verdana" Font-Size="10pt" HeaderStyle-BackColor="#aaaadd" AlternatingItemStyle-BackColor="#eeeeee" > </asp:DataGrid> </body> </html> 1.C#连接连接Access [复制此代码]CODE:
using System.Data; using System.Data.OleDb; .. string strConnection="Provider=Microsoft.Jet.OleDb.4.0;"; strConnection+=@"Data Source=C:BegASPNETNorthwind.mdb"; OleDbConnection objConnection=new OleDbConnection(strConnection); .. objConnection.Open(); objConnection.Close(); 解释: 连接Access数据库需要导入额外的命名空间,所以有了最前面的两条using命令,这是必不可少的! strConnection这个变量里存放的是连接数据库所需要的连接字符串,他指定了要使用的数据提供者和要使用的数据源. "Provider=Microsoft.Jet.OleDb.4.0;"是指数据提供者,这里使用的是Microsoft Jet引擎,也就是Access中的数据引擎,asp.net就是靠这个和Access的数据库连接的. "Data Source=C:\BegASPNET\Northwind.mdb"是指明数据源的位置,他的标准形式是"Data Source=MyDrive:MyPath\MyFile.MDB". PS: 1."+="后面的"@"符号是防止将后面字符串中的"\"解析为转义字符. 2.如果要连接的数据库文件和当前文件在同一个目录下,还可以使用如下的方法连接: strConnection+="Data Source="; strConnection+=MapPath("Northwind.mdb"); 这样就可以省得你写一大堆东西了! 3.要注意连接字符串中的参数之间要用分号来分隔. "OleDbConnection objConnection=new OleDbConnection(strConnection);"这一句是利用定义好的连接字符串来建立了一个链接对象,以后对数据库的操作我们都要和这个对象打交道. "objConnection.Open();"这用来打开连接.至此,与Access数据库的连接完成. 2.C#连接SQL Server [复制此代码]CODE:
using System.Data; using System.Data.SqlClient; .. string strConnection="user id=sa;password=;"; strConnection+="initial catalog=Northwind;Server=YourSQLServer;"; strConnection+="Connect Timeout=30"; SqlConnection objConnection=new SqlConnection(strConnection); .. objConnection.Open(); objConnection.Close(); 解释: 连接SQL Server数据库的机制与连接Access的机制没有什么太大的区别,只是改变了Connection对象和连接字符串中的不同参数. 首先,连接SQL Server使用的命名空间不是"System.Data.OleDb",而是"System.Data.SqlClient". 其次就是他的连接字符串了,我们一个一个参数来介绍(注意:参数间用分号分隔): "user id=sa":连接数据库的验证用户名为sa.他还有一个别名"uid",所以这句我们还可以写成"uid=sa". "password=":连接数据库的验证密码为空.他的别名为"pwd",所以我们可以写为"pwd=". 这里注意,你的SQL Server必须已经设置了需要用户名和密码来登录,否则不能用这样的方式来登录.如果你的SQL Server设置为Windows登录,那么在这里就不需要使用"user id"和"password"这样的方式来登录,而需要使用"Trusted_Connection=SSPI"来进行登录. "initial catalog=Northwind":使用的数据源为"Northwind"这个数据库.他的别名为"Database",本句可以写成"Database=Northwind". "Server=YourSQLServer":使用名为"YourSQLServer"的服务器.他的别名为"Data Source","Address","Addr".如果使用的是本地数据库且定义了实例名,则可以写为"Server=(local)\实例名";如果是远程服务器,则将"(local)"替换为远程服务器的名称或IP地址. "Connect Timeout=30":连接超时时间为30秒. 在这里,建立连接对象用的构造函数为:SqlConnection. 3.C#连接Oracle [复制此代码]CODE:
using System.Data.OracleClient; using System.Data; //在窗体上添加一个按钮,叫Button1,双击Button1,输入以下代码 private void Button1_Click(object sender, System.EventArgs e) { string ConnectionString="Data Source=sky;user=system;password=manager;";//写连接串 OracleConnection conn=new OracleConnection(ConnectionString);//创建一个新连接 try { conn.Open(); OracleCommand cmd=conn.CreateCommand(); cmd.CommandText="select * from MyTable";//在这儿写sql语句 OracleDataReader odr=cmd.ExecuteReader();//创建一个OracleDateReader对象 while(odr.Read())//读取数据,如果odr.Read()返回为false的话,就说明到记录集的尾部了 { Response.Write(odr.GetOracleString(1).ToString());//输出字段1,这个数是字段索引,具体怎么使用字段名还有待研究 } odr.Close(); } catch(Exception ee) { Response.Write(ee.Message); //如果有错误,输出错误信息 } finally { conn.Close(); //关闭连接 } } 4.C#连接MySQL [复制此代码]CODE:
using MySQLDriverCS; // 建立数据库连接 MySQLConnection DBConn; DBConn = new MySQLConnection(new MySQLConnectionString("localhost","mysql","root","",3306).AsString); DBConn.Open(); // 执行查询语句 MySQLCommand DBComm; DBComm = new MySQLCommand("select Host,User from user",DBConn); // 读取数据 MySQLDataReader DBReader = DBComm.ExecuteReaderEx(); // 显示数据 try { while (DBReader.Read()) { Console.WriteLine("Host = {0} and User = {1}", DBReader.GetString(0),DBReader.GetString(1)); } } finally { DBReader.Close(); DBConn.Close(); } //关闭数据库连接 DBConn.Close(); 5.C#连接IBM DB2 [复制此代码]CODE:
OleDbConnection1.Open(); //打开数据库连接 OleDbDataAdapter1.Fill(dataSet1,"Address"); //将得来的数据填入dataSet DataGrid1.DataBind(); //绑定数据 OleDbConnection1.Close(); //关闭连接 //增加数据库数据 在Web Form上新增对应字段数量个数的TextBox,及一个button,为该按键增加Click响应事件代码如下: [复制此代码]CODE:
this.OleDbInsertCommand1.CommandText = "INSERTsintosADDRESS(NAME, EMAIL, AGE, ADDRESS) VALUES ('"+TextBox1.Text+"','"+TextBox2.Text+"','"+TextBox3.Text+"','"+TextBox4.Text+"')"; OleDbInsertCommand1.Connection.Open(); //打开连接 OleDbInsertCommand1.ExecuteNonQuery(); //执行该SQL语句 OleDbInsertCommand1.Connection.Close(); //关闭连接 6.C#连接SyBase (OleDb) [复制此代码]CODE:
Provider=Sybase.ASEOLEDBProvider.2;Initial Catalog=数据库名;User ID=用户名;Data Source=数据源;Extended Properties="";Server Name=ip地址;Network Protocol=Winsock;Server Port Address=5000; |