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()'串連資料庫
objCmd.Connection = objConn
objCmd.CommandText = "select * from Commands"
objDataReader = objCmd.ExecuteReader()'執行SQL語句
While objDataReader.Read()'讀資料，以下和資料庫連接無關
CommandList.Items.Add(objDataReader.GetString(0) & "," & objDataReader.GetString(1))
End While
objConn.Close()
End Sub 二 Asp.net串連SQL Server2000資料庫常式詳解:
<%@ 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.串連資料庫
myConnection = New SqlConnection( "server=localhost;database=Pubs;uid=ueytjdf;pwd=doekdf" )
myConnection.Open()
la1.text="Connection Opened!" '2.建立一個新表
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 添加紀錄
myCommand = New SqlCommand( "Insert into [test] (name,sex) values( '黃志文','男' )", myConnection )
myCommand.ExecuteNonQuery()
la3.text="New Record Inserted!" '3 更新資料
myCommand = New SqlCommand( "UPDATE [test] SET name='Smith' where name='李明'", myConnection )
myCommand.ExecuteNonQuery()
la4.text="Record Updated!" '4 刪除資料
myCommand = New SqlCommand( "delete from [test] where name='Smith'", myConnection )
myCommand.ExecuteNonQuery()
la5.text="Record Deleted!" '5 用DataGrid顯示資料
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串連access資料庫常式
<%@ 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.串連資料庫
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.添加記錄
myCommand = New OleDbCommand( "Insert INTO Authors(Authors,country) Values('Simson','usa')", myConnection )
myCommand.ExecuteNonQuery()
la2.text="New Record Inserted!" '3 更新資料(Access)
myCommand = New OleDbCommand( "UPDATE Authors SET Authors='Bennett' WHERE Authors = 'Simson'", myConnection )
myCommand.ExecuteNonQuery()
la3.text="Record Updated!" '4 刪除資料（access）
myCommand = New OleDbCommand( "DELETE FROM Authors WHERE Authors = 'David'", myConnection )
myCommand.ExecuteNonQuery()
la4.text="Record Deleted!" '5 使用DateGrid顯示資料
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#串連串連Access[複製此代碼]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(); 解釋:
串連Access資料庫需要匯入額外的命名空間,所以有了最前面的兩條using命令,這是必不可少的!
strConnection這個變數裡存放的是串連資料庫所需要的連接字串,他指定了要使用的資料提供者和要使用的資料來源.
"Provider=Microsoft.Jet.OleDb.4.0;"是指資料提供者,這裡使用的是Microsoft Jet引擎,也就是Access中的資料引擎,asp.net就是靠這個和Access的資料庫連接的.
"Data Source=C:\BegASPNET\Northwind.mdb"是指明資料來源的位置,他的標準形式是"Data Source=MyDrive:MyPath\MyFile.MDB".
PS:
1."+="後面的"@"符號是防止將後面字串中的"\"解析為逸出字元.
2.如果要串連的資料庫檔案和當前檔案在同一個目錄下,還可以使用如下的方法串連:
strConnection+="Data Source=";
strConnection+=MapPath("Northwind.mdb");
這樣就可以省得你寫一大堆東西了!
3.要注意連接字串中的參數之間要用分號來分隔.
"OleDbConnection objConnection=new OleDbConnection(strConnection);"這一句是利用定義好的連接字串來建立了一個連結化物件,以後對資料庫的操作我們都要和這個對象打交道.
"objConnection.Open();"這用來開啟串連.至此,與Access資料庫的串連完成.
2.C#串連SQL Server
[複製此代碼]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(); 解釋:
串連SQL Server資料庫的機制與串連Access的機制沒有什麼太大的區別,只是改變了Connection對象和連接字串中的不同參數.
首先,串連SQL Server使用的命名空間不是"System.Data.OleDb",而是"System.Data.SqlClient".
其次就是他的連接字串了,我們一個一個參數來介紹(注意:參數間用分號分隔):
"user id=sa":串連資料庫的驗證使用者名稱為sa.他還有一個別名"uid",所以這句我們還可以寫成"uid=sa".
"password=":串連資料庫的驗證密碼為空白.他的別名為"pwd",所以我們可以寫為"pwd=".
這裡注意,你的SQL Server必須已經設定了需要使用者名稱和密碼來登入,否則不能用這樣的方式來登入.如果你的SQL Server設定為Windows登入,那麼在這裡就不需要使用"user id"和"password"這樣的方式來登入,而需要使用"Trusted_Connection=SSPI"來進行登入.
"initial catalog=Northwind":使用的資料來源為"Northwind"這個資料庫.他的別名為"Database",本句可以寫成"Database=Northwind".
"Server=YourSQLServer":使用名為"YourSQLServer"的伺服器.他的別名為"Data Source","Address","Addr".如果使用的是本機資料庫且定義了執行個體名,則可以寫為"Server=(local)\執行個體名";如果是遠程伺服器,則將"(local)"替換為遠程伺服器的名稱或IP地址.
"Connect Timeout=30":連線逾時時間為30秒.
在這裡,建立連線物件用的建構函式為:SqlConnection.
3.C#串連Oracle[複製此代碼]CODE: using System.Data.OracleClient;
using System.Data;
//在表單上添加一個按鈕，叫Button1，雙擊Button1，輸入以下代碼
private void Button1_Click(object sender, System.EventArgs e)
{
string ConnectionString="Data Source=sky;user=system;password=manager;";//寫串連串
OracleConnection conn=new OracleConnection(ConnectionString);//建立一個新串連
try
{
conn.Open();
OracleCommand cmd=conn.CreateCommand();
cmd.CommandText="select * from MyTable";//在這兒寫sql語句
OracleDataReader odr=cmd.ExecuteReader();//建立一個OracleDateReader對象
while(odr.Read())//讀取資料，如果odr.Read()返回為false的話，就說明到記錄集的尾部了
{
Response.Write(odr.GetOracleString(1).ToString());//輸出欄位1，這個數是欄位索引，具體怎麼使用欄位名還有待研究
}
odr.Close();
}
catch(Exception ee)
{
Response.Write(ee.Message); //如果有錯誤，輸出錯誤資訊
}
finally
{
conn.Close(); //關閉串連
}
} 4.C#串連MySQL[複製此代碼]CODE: using MySQLDriverCS;
// 建立資料庫連接
MySQLConnection DBConn;
DBConn = new MySQLConnection(new MySQLConnectionString("localhost","mysql","root","",3306).AsString);
DBConn.Open();
// 執行查詢語句
MySQLCommand DBComm;
DBComm = new MySQLCommand("select Host,User from user",DBConn);
// 讀取資料
MySQLDataReader DBReader = DBComm.ExecuteReaderEx();
// 顯示資料
try
{
while (DBReader.Read())
{
Console.WriteLine("Host = {0} and User = {1}", DBReader.GetString(0),DBReader.GetString(1));
}
}
finally
{
DBReader.Close();
DBConn.Close();
}
//關閉資料庫連接
DBConn.Close(); 5.C#串連IBM DB2
[複製此代碼]CODE: OleDbConnection1.Open();
//開啟資料庫連接
OleDbDataAdapter1.Fill(dataSet1,"Address");
//將得來的資料填入dataSet
DataGrid1.DataBind();
//綁定資料
OleDbConnection1.Close();
//關閉串連
//增加資料庫資料 在Web Form上新增對應欄位數量個數的TextBox，及一個button，為該按鍵增加Click響應事件代碼如下：[複製此代碼]CODE: this.OleDbInsertCommand1.CommandText = "INSERTsintosADDRESS(NAME,
EMAIL, AGE, ADDRESS) VALUES
('"+TextBox1.Text+"','"+TextBox2.Text+"','"+TextBox3.Text+"','"+TextBox4.Text+"')";
OleDbInsertCommand1.Connection.Open();
//開啟串連
OleDbInsertCommand1.ExecuteNonQuery();
//執行該SQL語句
OleDbInsertCommand1.Connection.Close();
//關閉串連 6.C#串連SyBase
(OleDb)[複製此代碼]CODE: Provider=Sybase.ASEOLEDBProvider.2;Initial Catalog=資料庫名;User ID=使用者名稱;Data Source=資料來源;Extended Properties="";Server Name=ip地址;Network Protocol=Winsock;Server Port Address=5000; |
