ADO.net中数据库连接方式

在MSDN中&＃xff0c;.net的数据库连接字符串都有详细的说明&＃xff0c;我这里以代码范例的方式罗列一些&＃xff0c;具体的每一项代表的意义可以参看MSDN.

ADO.net 中数据库连接方式(微软提供)

微软提供了以下四种数据库连接方式&＃xff1a;
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&＃xff0c;来依次说明&＃xff1a;

System.Data.SqlClient.SqlConnection
常用的一些连接字符串(C#代码)&＃xff1a;

SqlConnection conn
&＃61; new SqlConnection( "Server&＃61;(local);Integrated Security&＃61;SSPI;database&＃61;Pubs");

SqlConnection conn
&＃61; new SqlConnection("server&＃61;(local)\\NetSDK;database&＃61;pubs;Integrated Security&＃61;SSPI");

SqlConnection conn &＃61; new SqlConnection(
"Data Source&＃61;localhost;Integrated Security&＃61;SSPI;Initial Catalog&＃61;Northwind;");

SqlConnection conn &＃61; new SqlConnection(
" data source&＃61;(local);initial catalog&＃61;xr;integrated security&＃61;SSPI;
persist security info&＃61;False;workstation id&＃61;XURUI;packet size&＃61;4096; ");

SqlConnection myConn  &＃61; new
System.Data.SqlClient.SqlConnection("Persist Security Info&＃61;False;Integrated
Security&＃61;SSPI;database&＃61;northwind;server&＃61;mySQLServer");

SqlConnection conn &＃61; new SqlConnection(
" uid&＃61;sa;pwd&＃61;passwords;initial catalog&＃61;pubs;data source&＃61;127.0.0.1;Connect Timeout&＃61;900");

更多字符串连接说明请看MSDN&＃xff1a;
http://msdn.microsoft.com/library/default.asp?url&＃61;/library/en-us/cpref/html/frlrfSystemDataSqlClientSqlConnectionClassConnectionStringTopic.asp

System.Data.OleDb.OleDbConnection
常用的一些连接字符串(C#代码)&＃xff1a;

OleDbConnection conn &＃61; new OleDbConnection(&＃64;"Provider&＃61;Microsoft.Jet.OLEDB.4.0;Data Source&＃61;D:\MyWeb\81\05\GrocerToGo.mdb");

OleDbConnection conn &＃61; new OleDbConnection(
&＃64;"Provider&＃61;Microsoft.Jet.OLEDB.4.0;Password&＃61;;
User ID&＃61;Admin;Data Source&＃61;grocertogo.mdb;");

OleDbConnection conn &＃61; new OleDbConnection(
"Provider&＃61;MSDAORA; Data Source&＃61;ORACLE8i7;Persist Security Info&＃61;False;Integrated Security&＃61;yes");

OleDbConnection conn &＃61; new OleDbConnection(
"Provider&＃61;Microsoft.Jet.OLEDB.4.0; Data Source&＃61;c:\bin\LocalAccess40.mdb");

OleDbConnection conn &＃61; new OleDbConnection(
"Provider&＃61;SQLOLEDB;Data Source&＃61;MySQLServer;Integrated Security&＃61;SSPI");

更多字符串连接说明请看MSDN&＃xff1a;
http://msdn.microsoft.com/library/default.asp?url&＃61;/library/en-us/cpref/html/frlrfSystemDataOleDbOleDbConnectionClassConnectionStringTopic.asp?frame&＃61;true

System.Data.OracleClient.OracleConnection
常用的一些连接字符串(C#代码)&＃xff1a;

OracleConnection myConn &＃61; new System.Data.OracleClient.OracleConnection(
"Data Source&＃61;Oracle8i;Integrated Security&＃61;yes");

更多字符串连接说明请看MSDN&＃xff1a;
http://msdn.microsoft.com/library/default.asp?url&＃61;/library/en-us/cpref/html/frlrfSystemDataOracleClientOracleConnectionClassConnectionStringTopic.asp?frame&＃61;true

System.Data.Odbc.OdbcConnection
常用的一些连接字符串(C#代码)&＃xff1a;

OdbcConnection conn &＃61; new OdbcConnection(
"Driver&＃61;{SQL Server};Server&＃61;MyServer;Trusted_Connection&＃61;yes;Database&＃61;Northwind;");

OdbcConnection conn &＃61; new OdbcConnection(
"Driver&＃61;{Microsoft ODBC for Oracle};Server&＃61;ORACLE8i7;
Persist Security Info&＃61;False;Trusted_Connection&＃61;yes");

OdbcConnection conn &＃61; new OdbcConnection(
"Driver&＃61;{Microsoft Access Driver (*.mdb)};DBQ&＃61;c:\bin\nwind.mdb");

OdbcConnection conn &＃61; new OdbcConnection(
"Driver&＃61;{Microsoft Excel Driver (*.xls)};DBQ&＃61;c:\bin\book1.xls");

OdbcConnection conn &＃61; new OdbcConnection(
"Driver&＃61;{Microsoft Text Driver (*.txt; *.csv)};DBQ&＃61;c:\bin");

OdbcConnection conn &＃61; new OdbcConnection("DSN&＃61;dsnname");

更多字符串连接说明请看MSDN&＃xff1a;
http://msdn.microsoft.com/library/default.asp?url&＃61;/library/en-us/cpref/html/frlrfSystemDataOdbcOdbcConnectionClassConnectionStringTopic.asp?frame&＃61;true

其他厂商提供的数据库连接&＃xff1a;

DB2Connection myConn &＃61; new IBM.Data.DB2.DB2Connection(
"DATABASE &＃61; SAMPLE;UID&＃61;; PWD&＃61;;");

DB2Connection myConn &＃61; new IBM.Data.DB2.DB2Connection("DATABASE &＃61; SAMPLE");

BdpConnection myConn &＃61; new Borland.Data.Provider.BdpConnection("assembly&＃61;Borl
and.Data.Mssql,Version&＃61;1.1.0.0,Culture&＃61;neutral,PublicKeyToken&＃61;91d62ebb5b0d1b1b;ve
ndorclient&＃61;sqloledb.dll;osauthentication&＃61;False;database&＃61;;usernam
e&＃61;;hostname&＃61;;password&＃61;;provider&＃61;MSSQL");

BdpConnection myConn &＃61; new Borland.Data.Provider.BdpConnection("assembly&＃61;Borl
and.Data.Db2,Version&＃61;1.1.0.0,Culture&＃61;neutral,PublicKeyToken&＃61;91d62ebb5b0d1b1b;ve
ndorclient&＃61;db2cli.dll;database&＃61;;username&＃61;;
password&＃61;;provider&＃61;DB2");

Connection Pooling

在SQL Server、OLE DB和.NET框架结构中的Data Provider中&＃xff0c;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&＃xff1a;
Provider&＃61;SQLOLEDB;OLE DB Services&＃61;-4;Data Source&＃61;localhost;Integrated Security&＃61;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&＃xff1a;Connection Lifttime、Connection Reset、Enlist、Max Pool Size、Min Pool Size和Pooling。

更多数据库连接信息&＃xff0c;以及非ADO.net的连接字符串可以参看&＃xff1a;
http://www.connectionstrings.com/