ADO.net 中数据库连接方式

    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.

  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:

  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/library/default.asp?url=/library/en-us/cpref/html/frlrfSystemDataSqlClientSqlConnectionClassConnectionStringTopic.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:MyWebGrocerToGo.mdb");

  OleDbConnection conn = new OleDbConnection(

  @"Provider=Microsoft.Jet.OLEDB.4.0;Password=;

  User ID=Admin;Data Source=grocertogo.mdb;");

  OleDbConnection conn = new OleDbConnection(

  "Provider=MSDAORA; Data Source=ORACLE8i7;Persist Security Info=False;Integrated Security=yes");

  OleDbConnection conn = new OleDbConnection(

  "Provider=Microsoft.Jet.OLEDB.4.0; Data Source=c:binLocalAccess40.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/library/default.asp?url=/library/en-us/cpref/html/frlrfSystemDataOleDbOleDbConnectionClassConnectionStringTopic.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/library/default.asp?url=/library/en-us/cpref/html/frlrfSystemDataOracleClientOracleConnectionClassConnectionStringTopic.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:binnwind.mdb");

  OdbcConnection conn = new OdbcConnection(

  "Driver={Microsoft ExcelDriver (*.xls)};DBQ=c:binbook1.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/library/default.asp?url=/library/en-us/cpref/html/frlrfSystemDataOdbcOdbcConnectionClassConnectionStringTopic.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=; PWD=;");

  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=;usernam

  e=;hostname=;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=;username=;

  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。

  更多数据库连接信息,以及非ADO.net的连接字符串可以参看:

  http://www.connectionstrings.com/

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