ADO.net中数据库连接方式

发布: 2007-6-30 18:56 | 作者: admin | 来源: | 查看: 32次 | 进入软件测试论坛讨论

     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:\MyWeb\81\05\GrocerToGo.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:\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/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:\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/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=<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。

  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/