知识大全 asp.net 数据库连接的方法

Posted 2022-07-17 数据库

篇首语：不一定终身受雇，但一定终身学习。本文由小常识网(cha138.com)小编为大家整理，主要介绍了知识大全 asp.net 数据库连接的方法相关的知识，希望对你有一定的参考价值。

　　Sub LoadCommandList() Dim objConn As New Odbc OdbcConnection Dim objCmd As New Odbc OdbcCommand Dim objDataReader As Odbc OdbcDataReader CommandList Items Clear() objConn ConnectionString = "Driver=Microsoft Access Driver (* mdb);Dbq=" & Application StartupPath & "database mdb" Debug Print(Application StartupPath & "database mdb") objConn Open() 连接数据库 objCmd Connection = objConn objCmd CommandText = "select * from Commands" objDataReader = objCmd ExecuteReader() 执行SQL语句 While objDataReader Read() 读数据以下和数据库连接无关 CommandList Items Add(objDataReader GetString( ) & " " & objDataReader GetString( )) End While objConn Close() End Sub 二 Asp net连接SQL Server 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 连接数据库 myConnection = New SqlConnection( "server=localhost;database=Pubs;uid=ueytjdf;pwd=doekdf" ) myConnection Open() la text="Connection Opened!" 建立一个新表 myCommand = New SqlCommand( "CREATE TABLE [test] ([id] [int] IDENTITY ( ) NOT NULL [name] [char] ( ) COLLATE Chinese_PRC_CI_AS NULL [sex] [char] ( ) COLLATE Chinese_PRC_CI_AS NULL )" myConnection ) myCommand ExecuteNonQuery() la text="New table created!" 添加纪录 myCommand = New SqlCommand( "Insert into [test] (name sex) values( 黄志文男 )" myConnection ) myCommand ExecuteNonQuery() la text="New Record Inserted!" 更新数据 myCommand = New SqlCommand( "UPDATE [test] SET name= Smith where name= 李明 " myConnection ) myCommand ExecuteNonQuery() la text="Record Updated!" 删除数据 myCommand = New SqlCommand( "delete from [test] where name= Smith " myConnection ) myCommand ExecuteNonQuery() la text="Record Deleted!" 用DataGrid显示数据 myCommand = New SqlCommand( "select * from [test]" myConnection ) MyDataGrid DataSource=myCommand ExecuteReader() MyDataGrid DataBind() end sub </script> <> <body> <asp:label id="la " runat="server" /><br> <asp:label id="la " runat="server" /><br> <asp:label id="la " runat="server" /><br> <asp:label id="la " runat="server" /><br> <asp:label id="la " runat="server" /><br> <ASP:DataGrid id="MyDataGrid" runat="server" BorderColor="black" BorderWidth=" " GridLines="Both" CellPadding=" " CellSpacing=" " Font Name="Verdana" Font Size=" pt" HeaderStyle BackColor="#aaaadd" AlternatingItemStyle BackColor="#eeeeee" > </asp:DataGrid> </body> </> 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) 连接数据库 dim dbname as string dbname=server mappath("authors mdb") myConnection = New OleDbConnection( "PROVIDER=Microsoft Jet OLEDB ;DATA Source="&dbname ) myConnection Open() la text="Connection Opened!" 添加记录 myCommand = New OleDbCommand( "Insert INTO Authors(Authors country) Values( Simson usa )" myConnection ) myCommand ExecuteNonQuery() la text="New Record Inserted!" 更新数据(Access) myCommand = New OleDbCommand( "UPDATE Authors SET Authors= Bennett WHERE Authors = Simson " myConnection ) myCommand ExecuteNonQuery() la text="Record Updated!" 删除数据（access） myCommand = New OleDbCommand( "DELETE FROM Authors WHERE Authors = David " myConnection ) myCommand ExecuteNonQuery() la text="Record Deleted!" 使用DateGrid显示数据 myCommand = New OleDbCommand( "select * FROM Authors" myConnection ) MyDataGrid DataSource=myCommand Executereader() MyDataGrid DataBind() end sub </script> <> <body> <asp:label id="la " runat="server" /><br> <asp:label id="la " runat="server" /><br> <asp:label id="la " runat="server" /><br> <asp:label id="la " runat="server" /><br> <ASP:DataGrid id="MyDataGrid" runat="server" BorderColor="black" BorderWidth=" " GridLines="Both" CellPadding=" " CellSpacing=" " Font Name="Verdana" Font Size=" pt" HeaderStyle BackColor="#aaaadd" AlternatingItemStyle BackColor="#eeeeee" > </asp:DataGrid> </body> </> 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 ;"; 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 ;"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:BegASPNETNorthwind mdb"是指明数据源的位置他的标准形式是"Data Source=MyDrive:MyPathMyFile MDB" PS: 　 "+="后面的"@"符号是防止将后面字符串中的""解析为转义字符　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! 　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 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= "; 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= ":连接超时时间为秒　在这里建立连接对象用的构造函数为:SqlConnection 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Button 双击Button 输入以下代码 private void Button _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( ) ToString());//输出字段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

　　 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" "" ) 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 = and User = " DBReader GetString( ) DBReader GetString( )); finally DBReader Close(); DBConn Close(); //关闭数据库连接 DBConn Close();

　　 C#连接IBM DB

[ 复制此代码]CODE: OleDbConnection Open(); //打开数据库连接 OleDbDataAdapter Fill(dataSet "Address"); //将得来的数据填入dataSet DataGrid DataBind(); //绑定数据 OleDbConnection 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 OleDbInsertCommand CommandText = "INSERTsintosADDRESS(NAME EMAIL AGE ADDRESS) VALUES ( "+TextBox Text+" "+TextBox Text+" "+TextBox Text+" "+TextBox Text+" )"; OleDbInsertCommand Connection Open(); //打开连接 OleDbInsertCommand ExecuteNonQuery(); //执行该SQL语句 OleDbInsertCommand Connection Close(); //关闭连接 [ 复制此代码]CODE: Provider=Sybase ASEOLEDBProvider ;Initial Catalog=数据库名;User ID=用户名;Data Source=数据源;Extended Properties="";Server Name=ip地址;Neork Protocol=Winsock;Server Port Address= cha138/Article/program/net/201311/14210