我常用的
MS SQL2005
SQL Native Client OLE DB Provider

Standard security
Provider=SQLNCLI;Server=myServerAddress;Database=myDataBase;Uid=myUsername;Pwd=myPassword;

Trusted connection
Provider=SQLNCLI;Server=myServerAddress;Database=myDataBase;Trusted_Connection=yes;

Prompt for username and password
oConn.Properties("Prompt") = adPromptAlways
oConn.Open "Provider=SQLNCLI;Server=myServerAddress;DataBase=myDataBase;

Attach a database file on connect to a local SQL Server Express instance
Provider=SQLNCLI;Server=."SQLExpress;AttachDbFilename=c:"asd"qwe"mydbfile.mdf; Database=dbname;Trusted_Connection=Yes;

Attach a database file, located in the data directory, on connect to a local SQL Server Express instance
Provider=SQLNCLI;Server=."SQLExpress;AttachDbFilename=|DataDirectory|mydbfile.mdf; Database=dbname;Trusted_Connection=Yes;

Database mirroring
Data Source=myServerAddress;Failover Partner=myMirrorServer;Initial Catalog=myDataBase;Integrated Security=True;

SqlConnection (.NET)

Standard Security
Data Source=myServerAddress;Initial Catalog=myDataBase;User Id=myUsername;Password=myPassword;

Standard Security alternative syntax
Server=myServerAddress;Database=myDataBase;User ID=myUsername;Password=myPassword;Trusted_Connection=False;

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Context Connection
C#
 using(SqlConnection connection = new SqlConnection("context connection=true"))
 {
     connection.Open();
     // Use the connection
 }

VB.Net
 Using connection as new SqlConnection("context connection=true")
     connection.Open()
     ' Use the connection
 End Using
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MS Access 2007

Standard security
Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:"myFolder"myAccess2007file.accdb;Persist Security Info=False;

With database password
Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:"myFolder"myAccess2007file.accdb;Jet OLEDB:Database Password=MyDbPassword;