ADO.net 中数据库连接方式(微软提供)

在MSDN中，.net的数据库连接字符串都有详细的说明，我这里以代码范例的方式罗列一些，具体的每一项代表的意义可以参看MSDN。

微软提供了以下四种数据库连接方式：
System.Data.OleDb.OleDbConnection
System.Data.SqlClient.SqlConnection
System.Data.Odbc.OdbcConnection
System.Data.OracleClient.OracleConnection
下面我们以范例的方式，来依次说明：

System.Data.SqlClient.SqlConnection
常用的一些连接字符串(C#代码)：

SqlConnection conn = new SqlConnection( “Server=(local);Integrated Security=SSPI;database=Pubs“);

SqlConnection conn = new SqlConnection(“server=(local)\\NetSDK;database=pubs;Integrated Security=SSPI“);

SqlConnection conn = new SqlConnection(“Data Source=localhost;Integrated Security=SSPI;Initial Catalog=Northwind;“);

SqlConnection conn = new SqlConnection(“ data source=(local);initial catalog=xr;integrated security=SSPI;
persist security info=False;workstation id=XURUI;packet size=4096; “);

SqlConnection myConn  = new System.Data.SqlClient.SqlConnection(“Persist Security Info=False;Integrated
Security=SSPI;database=northwind;server=mySQLServer“);

SqlConnection conn = new SqlConnection( “ uid=sa;pwd=passwords;initial catalog=pubs;data source=127.0.0.1;Connect Timeout=900“);

更多字符串连接说明请看MSDN：
http://msdn.microsoft.com/librar ... tionStringTopic.asp

System.Data.OleDb.OleDbConnection
常用的一些连接字符串(C#代码)：

OleDbConnection conn = new OleDbConnection(@“Provider=Microsoft.Jet.OLEDB.4.0;Data Source=D:\\MyWeb5\\GrocerToGo.mdb“);

OleDbConnection conn = new OleDbConnection(@“Provider=Microsoft.Jet.OLEDB.4.0assword=;
User ID=Admin;Data Source=grocertogo.mdb;“);

OleDbConnection conn = new OleDbConnection(“Provider=MSDAORA; Data Source=ORACLE8i7ersist Security Info=False;Integrated Security=yes“);

OleDbConnection conn = new OleDbConnection(“Provider=Microsoft.Jet.OLEDB.4.0; Data Source=c:\\bin\\LocalAccess40.mdb“);

OleDbConnection conn = new OleDbConnection(“Provider=SQLOLEDB;Data Source=MySQLServer;Integrated Security=SSPI“);

更多字符串连接说明请看MSDN：
http://msdn.microsoft.com/librar ... opic.asp?frame=true
System.Data.OracleClient.OracleConnection
常用的一些连接字符串(C#代码)：
OracleConnection myConn = new System.Data.OracleClient.OracleConnection(
“Data Source=Oracle8i;Integrated Security=yes“);

更多字符串连接说明请看MSDN：
http://msdn.microsoft.com/librar ... opic.asp?frame=true
System.Data.Odbc.OdbcConnection
常用的一些连接字符串(C#代码)：
OdbcConnection conn = new OdbcConnection(
“Driver={SQL Server};Server=MyServer;Trusted_Connection=yes;Database=Northwind;“);

OdbcConnection conn = new OdbcConnection(
“Driver={Microsoft ODBC for Oracle};Server=ORACLE8i7;
Persist Security Info=False;Trusted_Connection=yes“);

OdbcConnection conn = new OdbcConnection(
“Driver={Microsoft Access Driver (*.mdb)};DBQ=c:\\bin\\nwind.mdb“);

OdbcConnection conn = new OdbcConnection(
“Driver={Microsoft Excel Driver (*.xls)};DBQ=c:\\bin\\book1.xls“);

OdbcConnection conn = new OdbcConnection(
“Driver={Microsoft Text Driver (*.txt; *.csv)};DBQ=c:\\bin“);

OdbcConnection conn = new OdbcConnection(“DSN=dsnname“);

更多字符串连接说明请看MSDN：
http://msdn.microsoft.com/librar ... opic.asp?frame=true

其他厂商提供的数据库连接：

DB2Connection myConn = new IBM.Data.DB2.DB2Connection(
“DATABASE = SAMPLE;UID=〈username〉; PWD=〈password〉;“);

DB2Connection myConn = new IBM.Data.DB2.DB2Connection(“DATABASE = SAMPLE“);

BdpConnection myConn = new Borland.Data.Provider.BdpConnection(“assembly=Borl
and.Data.Mssql,Version=1.1.0.0,Culture=neutral,PublicKeyToken=91d62ebb5b0d1b1b;ve
ndorclient=sqloledb.dll;osauthentication=False;database=〈database〉;usernam
e=〈user〉;hostname=〈host〉;password=〈password〉;provider=MSSQL“);

BdpConnection myConn = new Borland.Data.Provider.BdpConnection(“assembly=Borl
and.Data.Db2,Version=1.1.0.0,Culture=neutral,PublicKeyToken=91d62ebb5b0d1b1b;ve
ndorclient=db2cli.dll;database=〈database〉;username=〈user〉;
password=〈password〉;provider=DB2“);

Connection Pooling

在SQL Server、OLE DB和.NET框架结构中的Data Provider中，都提供了隐式的连接池连接支持。你可以在ConnectionString中指定不同的参数值控制连接池的行为。比如下面的例子使OLE DB的连接池无效并自动地进行事务处理：
Provider=SQLOLEDB;OLE DB Services=-4;Data Source=localhost;Integrated Security=SSPI;
在SQL Server.NET Data Provider中提供了以下参数设置控制连接池的行为：Connection Lifttime、Connection Reset、Enlist、Max Pool Size、Min Pool Size和Pooling。