PS:如果不是太稳定的数据库，最好使用connection lifetime=10来限制连接池内连接的生存日期

Standard Security:

"Driver={SQL Server};Server=Aron1;Database=pubs;Uid=sa;Pwd=asdasd;"

Trusted connection:

"Driver={SQL Server};Server=Aron1;Database=pubs;Trusted_Connection=yes;"

Prompt for username and password:

oConn.Properties("Prompt") = adPromptAlways

oConn.Open "Driver={SQL Server};Server=Aron1;DataBase=pubs;"

OLE DB, OleDbConnection (.NET)

Standard Security:

"Provider=sqloledb;Data Source=Aron1;Initial Catalog=pubs;User Id=sa;Password=asdasd;"

Trusted Connection:

"Provider=sqloledb;Data Source=Aron1;Initial Catalog=pubs;Integrated Security=SSPI;"

(use serverName\instanceName as Data Source to use an specifik SQLServer instance, only SQLServer2000)

Prompt for username and password:

oConn.Provider = "sqloledb"

oConn.Properties("Prompt") = adPromptAlways

oConn.Open "Data Source=Aron1;Initial Catalog=pubs;"

Connect via an IP address:

"Provider=sqloledb;Data Source=190.190.200.100,1433;Network Library=DBMSSOCN;Initial Catalog=pubs;User ID=sa;Password=asdasd;"

(DBMSSOCN=TCP/IP instead of Named Pipes, at the end of the Data Source is the port to use (1433 is the default))

SqlConnection (.NET)

Standard Security:

"Data Source=Aron1;Initial Catalog=pubs;User Id=sa;Password=asdasd;"

- or -

"Server=Aron1;Database=pubs;User ID=sa;Password=asdasd;Trusted_Connection=False"

(both connection strings produces the same result)

Trusted Connection:

"Data Source=Aron1;Initial Catalog=pubs;Integrated Security=SSPI;"

- or -

"Server=Aron1;Database=pubs;Trusted_Connection=True;"

(both connection strings produces the same result)

(use serverName\instanceName as Data Source to use an specifik SQLServer instance, only SQLServer2000)

Connect via an IP address:

"Data Source=190.190.200.100,1433;Network Library=DBMSSOCN;Initial Catalog=pubs;User ID=sa;Password=asdasd;"

(DBMSSOCN=TCP/IP instead of Named Pipes, at the end of the Data Source is the port to use (1433 is the default))

Declare the SqlConnection:

C#:

using System.Data.SqlClient;

SqlConnection oSQLConn = new SqlConnection();

oSQLConn.ConnectionString="my connection string";

oSQLConn.Open();

VB.NET:

Imports System.Data.SqlClient

Dim oSQLConn As SqlConnection = New SqlConnection()

oSQLConn.ConnectionString="my connection string"

oSQLConn.Open()

Data Shape

MS Data Shape

"Provider=MSDataShape;Data Provider=SQLOLEDB;Data Source=Aron1;Initial Catalog=pubs;User ID=sa;Password=asdasd;"

Want to learn data shaping? Check out 4GuyfFromRolla's great article about Data Shaping >>

Read more

How to define which network protocol to use

Example:

"Provider=sqloledb;Data Source=190.190.200.100,1433;Network Library=DBMSSOCN;Initial Catalog=pubs;User ID=sa;Password=asdasd;"

Name Network library

dbnmpntw Win32 Named Pipes

dbmssocn Win32 Winsock TCP/IP

dbmsspxn Win32 SPX/IPX

dbmsvinn Win32 Banyan Vines

dbmsrpcn Win32 Multi-Protocol (Windows RPC)

Important note!

When connecting through the SQLOLEDB provider use the syntax Network Library=dbmssocn

and when connecting through MSDASQL provider use the syntax Network=dbmssocn

All SqlConnection connection string properties

This table shows all connection string properties for the ADO.NET SqlConnection object. Most of the properties are also used in ADO. All properties and descriptions is from msdn.

Name Default Description

Application Name   The name of the application, or '.Net SqlClient Data Provider' if no application name is provided.

AttachDBFilename

-or-

extended properties

-or-

Initial File Name   The name of the primary file, including the full path name, of an attachable database. The database name must be specified with the keyword 'database'.

Connect Timeout

-or-

Connection Timeout 15 The length of time (in seconds) to wait for a connection to the server before terminating the attempt and generating an error.

Connection Lifetime 0 When a connection is returned to the pool, its creation time is compared with the current time, and the connection is destroyed if that time span (in seconds) exceeds the value specified by connection lifetime. Useful in clustered configurations to force load balancing between a running server and a server just brought on-line.

Connection Reset 'true' Determines whether the database connection is reset when being removed from the pool. Setting to 'false' avoids making an additional server round-trip when obtaining a connection, but the programmer must be aware that the connection state is not being reset.

Current Language   The SQL Server Language record name.

Data Source

-or-

Server

-or-

Address

-or-

Addr

-or-

Network Address   The name or network address of the instance of SQL Server to which to connect.

Enlist 'true' When true, the pooler automatically enlists the connection in the creation thread's current transaction context.

Initial Catalog

-or-

Database   The name of the database.

Integrated Security

-or-

Trusted_Connection 'false' Whether the connection is to be a secure connection or not. Recognized values are 'true', 'false', and 'sspi', which is equivalent to 'true'.

Max Pool Size 100 The maximum number of connections allowed in the pool.

Min Pool Size 0 The minimum number of connections allowed in the pool.

Network Library

-or-

Net 'dbmssocn' The network library used to establish a connection to an instance of SQL Server. Supported values include dbnmpntw (Named Pipes), dbmsrpcn (Multiprotocol), dbmsadsn (Apple Talk), dbmsgnet (VIA), dbmsipcn (Shared Memory) and dbmsspxn (IPX/SPX), and dbmssocn (TCP/IP).

The corresponding network DLL must be installed on the system to which you connect. If you do not specify a network and you use a local server (for example, "." or "(local)"), shared memory is used.

Packet Size 8192 Size in bytes of the network packets used to communicate with an instance of SQL Server.

Password

-or-

Pwd   The password for the SQL Server account logging on.

Persist Security Info 'false' When set to 'false', security-sensitive information, such as the password, is not returned as part of the connection if the connection is open or has ever been in an open state. Resetting the connection string resets all connection string values including the password.

Pooling 'true' When true, the SQLConnection object is drawn from the appropriate pool, or if necessary, is created and added to the appropriate pool.

User ID   The SQL Server login account.

Workstation ID the local computer name The name of the workstation connecting to SQL Server.

Note

Use ; to separate each property.

If a name occurs more than once, the value from the last one in the connection string will be used.

If you are building your connection string in your app using values from user input fields, make sure the user can't change the connection string by inserting an additional property with another value within the user value.

SQL Server 2005

SQL Native Client ODBC Driver

Standard security:

"Driver={SQL Native Client};Server=Aron1;Database=pubs;UID=sa;PWD=asdasd;"

Trusted connection:

"Driver={SQL Native Client};Server=Aron1;Database=pubs;Trusted_Connection=yes;"

Equivalents

Integrated Security=SSPI equals Trusted_Connection=yes

Prompt for username and password:

oConn.Properties("Prompt") = adPromptAlways

oConn.Open "Driver={SQL Native Client};Server=Aron1;DataBase=pubs;"

Enabling MARS (multiple active result sets):

"Driver={SQL Native Client};Server=Aron1;Database=pubs;Trusted_Connection=yes;MARS_Connection=yes"

Equivalents

MultipleActiveResultSets=true equals MARS_Connection=yes

Using MARS with SQL Native Client, by Chris Lee >>

Encrypt data sent over network:

"Driver={SQL Native Client};Server=Aron1;Database=pubs;Trusted_Connection=yes;Encrypt=yes"

Attach a database file on connect to a local SQL Server Express instance:

"Driver={SQL Native Client};Server=.\SQLExpress;AttachDbFilename=c:\asd\qwe\mydbfile.mdf;Database=dbname;Trusted_Connection=Yes;"

- or -

"Driver={SQL Native Client};Server=.\SQLExpress;AttachDbFilename=|DataDirectory|mydbfile.mdf;Database=dbname;Trusted_Connection=Yes;"

(use |DataDirectory| when your database file resides in the data directory)

Why is the "Database" parameter needed? Answer: If the database was previously attached, SQL Server does not reattach it (it uses the attached database as the default for the connection).

Download the SQL Native Client here >> (the package contains booth the ODBC driver and the OLE DB provider)

Using SQL Server 2005 Express? Don't miss the server name syntax: SERVERNAME\SQLEXPRESS (Substitute "SERVERNAME" with the name of the computer)

SQL Native Client OLE DB Provider

Standard security:

"Provider=SQLNCLI;Server=Aron1;Database=pubs;UID=sa;PWD=asdasd;"

Trusted connection:

"Provider=SQLNCLI;Server=Aron1;Database=pubs;Trusted_Connection=yes;"

Equivalents

Integrated Security=SSPI equals Trusted_Connection=yes

Prompt for username and password:

oConn.Properties("Prompt") = adPromptAlways

oConn.Open "Provider=SQLNCLI;Server=Aron1;DataBase=pubs;"

Enabling MARS (multiple active result sets):

"Provider=SQLNCLI;Server=Aron1;Database=pubs;Trusted_Connection=yes;MarsConn=yes"

Equivalents

MarsConn=yes equals MultipleActiveResultSets=true equals MARS_Connection=yes

Using MARS with SQL Native Client, by Chris Lee >>

Encrypt data sent over network:

"Provider=SQLNCLI;Server=Aron1;Database=pubs;Trusted_Connection=yes;Encrypt=yes"

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;"

- or -

"Provider=SQLNCLI;Server=.\SQLExpress;AttachDbFilename=|DataDirectory|mydbfile.mdf;Database=dbname;Trusted_Connection=Yes;"

(use |DataDirectory| when your database file resides in the data directory)

Why is the "Database" parameter needed? Answer: If the database was previously attached, SQL Server does not reattach it (it uses the attached database as the default for the connection).

Download the SQL Native Client here >> (the package contains booth the ODBC driver and the OLE DB provider)

Using SQL Server 2005 Express? Don't miss the server name syntax: SERVERNAME\SQLEXPRESS (Substitute "SERVERNAME" with the name of the computer)

SqlConnection (.NET)

Standard Security:

"Data Source=Aron1;Initial Catalog=pubs;User Id=sa;Password=asdasd;"

- or -

"Server=Aron1;Database=pubs;User ID=sa;Password=asdasd;Trusted_Connection=False"

(both connection strings produces the same result)

Trusted Connection:

"Data Source=Aron1;Initial Catalog=pubs;Integrated Security=SSPI;"

- or -

"Server=Aron1;Database=pubs;Trusted_Connection=True;"

(both connection strings produces the same result)

(use serverName\instanceName as Data Source to use an specifik SQLServer instance)

Connect via an IP address:

"Data Source=190.190.200.100,1433;Network Library=DBMSSOCN;Initial Catalog=pubs;User ID=sa;Password=asdasd;"

(DBMSSOCN=TCP/IP instead of Named Pipes, at the end of the Data Source is the port to use (1433 is the default))

Enabling MARS (multiple active result sets):

"Server=Aron1;Database=pubs;Trusted_Connection=True;MultipleActiveResultSets=true"

Note! Use ADO.NET 2.0 for MARS functionality. MARS is not supported in ADO.NET 1.0 nor ADO.NET 1.1

Streamline your Data Connections by Moving to MARS, by Laurence Moroney, DevX.com >>

Attach a database file on connect to a local SQL Server Express instance:

"Server=.\SQLExpress;AttachDbFilename=c:\asd\qwe\mydbfile.mdf;Database=dbname;Database=dbname;Trusted_Connection=Yes;"

- or -

"Server=.\SQLExpress;AttachDbFilename=|DataDirectory|mydbfile.mdf;Database=dbname;Trusted_Connection=Yes;"

(use |DataDirectory| when your database file resides in the data directory)

Why is the "Database" parameter needed? Answer: If the database was previously attached, SQL Server does not reattach it (it uses the attached database as the default for the connection).

Using "User Instance" on a local SQL Server Express instance:

"Data Source=.\SQLExpress;integrated security=true;attachdbfilename=|DataDirectory|\mydb.mdf;user instance=true;"

The "User Instance" functionality creates a new SQL Server instance on the fly during connect. This works only on a local SQL Server 2005 instance and only when connecting using windows authentication over local named pipes. The purpose is to be able to create a full rights SQL Server instance to a user with limited administrative rights on the computer. To enable the functionality: sp_configure 'user instances enabled','1' (0 to disable)

Using SQL Server 2005 Express? Don't miss the server name syntax: SERVERNAME\SQLEXPRESS (Substitute "SERVERNAME" with the name of the computer)

Context Connection - connecting to "self" from within your CLR stored prodedure/function

C#:

using(SqlConnection connection = new SqlConnection("context connection=true"))

{

connection.Open();

// Use the connection

}

Visual Basic:

Using connection as new SqlConnection("context connection=true")

connection.Open()

' Use the connection

End Using

The context connection lets you execute Transact-SQL statements in the same context (connection) that your code was invoked in the first place.

Read more

When to use SQL Native Client?

.Net applications

Do not use the SQL Native Client. Use the .NET Framework Data Provider for SQL Server (SqlConnection).

COM applications, all other then .NET applications

Use the SQL Native Client if you are accessing an SQL Server 2005 and need the new features of SQL Server 2005 such as MARS, encryption, XML data type etc. Continue use your current provider (OLE DB / ODBC through the MDAC package) if you are not connecting to an SQL Server 2005 (that's quite obvious eh..) or if you are connecting to an SQL Server 2005 but are not using any of the new SQL Server 2005 features.

For more details on the differences between MDAC and SQL Native Client, read this msdn article >>

Access

ODBC

Standard Security:

"Driver={Microsoft Access Driver (*.mdb)};Dbq=C:\mydatabase.mdb;Uid=Admin;Pwd=;"

Workgroup:

"Driver={Microsoft Access Driver (*.mdb)};Dbq=C:\mydatabase.mdb;SystemDB=C:\mydatabase.mdw;"

Exclusive:

"Driver={Microsoft Access Driver (*.mdb)};Dbq=C:\mydatabase.mdb;Exclusive=1;Uid=admin;Pwd="

OLE DB, OleDbConnection (.NET)

Standard security:

"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=\somepath\mydb.mdb;User Id=admin;Password=;"

Workgroup (system database):

"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=\somepath\mydb.mdb;Jet OLEDB:System Database=system.mdw;"

With password:

"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=\somepath\mydb.mdb;Jet OLEDB:Database Password=MyDbPassword;"

Oracle

ODBC

New version:

"Driver={Microsoft ODBC for Oracle};Server=OracleServer.world;Uid=Username;Pwd=asdasd;"

Old version:

"Driver={Microsoft ODBC Driver for Oracle};ConnectString=OracleServer.world;Uid=myUsername;Pwd=myPassword;"

OLE DB, OleDbConnection (.NET)

Standard security:

"Provider=msdaora;Data Source=MyOracleDB;User Id=UserName;Password=asdasd;"

This one's from Microsoft, the following are from Oracle

Standard Security:

"Provider=OraOLEDB.Oracle;Data Source=MyOracleDB;User Id=Username;Password=asdasd;"

Trusted Connection:

"Provider=OraOLEDB.Oracle;Data Source=MyOracleDB;OSAuthent=1;"

OracleConnection (.NET)

Standard:

"Data Source=MyOracleDB;Integrated Security=yes;"

This one works only with Oracle 8i release 3 or later

Specifying username and password:

"Data Source=MyOracleDB;User Id=username;Password=passwd;Integrated Security=no;"

This one works only with Oracle 8i release 3 or later

Declare the OracleConnection:

C#:

using System.Data.OracleClient;

OracleConnection oOracleConn = new OracleConnection();

oOracleConn.ConnectionString = "my connection string";

oOracleConn.Open();

VB.NET:

Imports System.Data.OracleClient

Dim oOracleConn As OracleConnection = New OracleConnection()

oOracleConn.ConnectionString = "my connection string"

oOracleConn.Open()

Missing the System.Data.OracleClient namespace? Download .NET Managed Provider for Oracle >>

Great article! "Features of Oracle Data Provider for .NET" by Rama Mohan G. at C# Corner

Core Labs OraDirect (.NET)

Standard:

"User ID=scott; Password=tiger; Host=ora; Pooling=true; Min Pool Size=0;Max Pool Size=100; Connection Lifetime=0"

Read more at Core Lab and the product page.

Data Shape

MS Data Shape:

"Provider=MSDataShape.1;Persist Security Info=False;Data Provider=MSDAORA;Data Source=orac;user id=username;password=mypw"

Want to learn data shaping? Check out 4GuyfFromRolla's great article about Data Shaping >>

MySQL

MyODBC

MyODBC 2.50 Local database:

"Driver={mySQL};Server=localhost;Option=16834;Database=mydatabase;"

MyODBC 2.50 Remote database:

"Driver={mySQL};Server=data.domain.com;Port=3306;Option=131072;Stmt=;Database=my-database;Uid=username;Pwd=password;"

MyODBC 3.51 Local database:

"DRIVER={MySQL ODBC 3.51 Driver};SERVER=localhost;DATABASE=myDatabase;USER=myUsername;PASSWORD=myPassword;OPTION=3;"

MyODBC 3.51 Remote database:

"DRIVER={MySQL ODBC 3.51 Driver};SERVER=data.domain.com;PORT=3306;DATABASE=myDatabase; USER=myUsername;PASSWORD=myPassword;OPTION=3;"

OLE DB, OleDbConnection (.NET)

Standard:

"Provider=MySQLProv;Data Source=mydb;User Id=UserName;Password=asdasd;"

Connector/Net 1.0 (.NET)

Standard:

"Server=Server;Database=Test;Uid=UserName;Pwd=asdasd;"

Download the driver at MySQL Developer Zone.

Specifying port:

"Server=Server;Port=1234;Database=Test;Uid=UserName;Pwd=asdasd;"

Default port is 3306. Enter value -1 to use a named pipe connection.

Declare the MySqlClient connection:

C#:

using MySql.Data.MySqlClient;

MySqlConnection oMySqlConn = new MySqlConnection();

oMySqlConn.ConnectionString = "Server=Server;Database=Test;Uid=UserName;Pwd=asdasd;";

oMySqlConn.Open();

VB.NET:

Imports MySql.Data.MySqlClient

Dim oMySqlConn As MySqlConnection = New MySqlConnection()

oMySqlConn.ConnectionString = "Server=Server;Database=Test;Uid=UserName;Pwd=asdasd;"

oMySqlConn.Open()

MySqlConnection (.NET)

eInfoDesigns.dbProvider:

"Data Source=server;Database=mydb;User ID=username;Password=pwd;Command Logging=false"

This one is used with eInfoDesigns dbProvider, an add-on to .NET

Declare the MySqlConnection:

C#:

using eInfoDesigns.dbProvider.MySqlClient;

MySqlConnection oMySqlConn = new MySqlConnection();

oMySqlConn.ConnectionString = "my connection string";

oMySqlConn.Open();

VB.NET:

Imports eInfoDesigns.dbProvider.MySqlClient

Dim oMySqlConn As MySqlConnection = New MySqlConnection()

oMySqlConn.ConnectionString = "my connection string"

oMySqlConn.Open()

SevenObjects MySqlClient (.NET)

Standard:

"Host=server; UserName=myusername; Password=mypassword;Database=mydb;"

This is a freeware ADO.Net data provider from SevenObjects

Core Labs MySQLDirect (.NET)

Standard:

"User ID=root; Password=pwd; Host=localhost; Port=3306; Database=test;Direct=true; Protocol=TCP; Compress=false; Pooling=true; Min Pool Size=0;Max Pool Size=100; Connection Lifetime=0"

Read more at Core Lab and the product page.

Interbase

ODBC, Easysoft

Local computer:

"Driver={Easysoft IB6 ODBC};Server=localhost;Database=localhost:C:\mydatabase.gdb;Uid=username;Pwd=password"

Remote Computer:

"Driver={Easysoft IB6 ODBC};Server=ComputerName;Database=ComputerName:C:\mydatabase.gdb;Uid=username;Pwd=password"

Read more about this driver: Easysoft ODBC-Interbase driver >>

ODBC, Intersolv

Local computer:

"Driver={INTERSOLV InterBase ODBC Driver (*.gdb)};Server=localhost;Database=localhost:C:\mydatabase.gdb;Uid=username;Pwd=password"

Remote Computer:

"Driver={INTERSOLV InterBase ODBC Driver (*.gdb)};Server=ComputerName;Database=ComputerName:C:\mydatabase.gdb;Uid=username;Pwd=password"

This driver are provided by DataDirect Technologies >> (formerly Intersolv)

OLE DB, SIBPROvider

Standard:

"provider=sibprovider;location=localhost:;data source=c:\databases\gdbs\mygdb.gdb;user id=SYSDBA;password=masterkey"

Specifying character set:

"provider=sibprovider;location=localhost:;data source=c:\databases\gdbs\mygdb.gdb;user id=SYSDBA;password=masterkey;character set=ISO8859_1"

Specifying role:

"provider=sibprovider;location=localhost:;data source=c:\databases\gdbs\mygdb.gdb;user id=SYSDBA;password=masterkey;role=DIGITADORES"

Read more about SIBPROvider >>

Read more about connecting to Interbase in this Borland Developer Network article http://community.borland.com/article/0,1410,27152,00.html

IBM DB2

OLE DB, OleDbConnection (.NET) from ms

TCP/IP:

"Provider=DB2OLEDB;Network Transport Library=TCPIP;Network Address=XXX.XXX.XXX.XXX;Initial Catalog=MyCtlg;Package Collection=MyPkgCol;Default Schema=Schema;User ID=MyUser;Password=MyPW"

APPC:

"Provider=DB2OLEDB;APPC Local LU Alias=MyAlias;APPC Remote LU Alias=MyRemote;Initial Catalog=MyCtlg;Package Collection=MyPkgCol;Default Schema=Schema;User ID=MyUser;Password=MyPW"

IBM's OLE DB Provider (shipped with IBM DB2 UDB v7 or above)

TCP/IP:

Provider=IBMDADB2;Database=sample;HOSTNAME=db2host;PROTOCOL=TCPIP;PORT=50000;uid=myUserName;pwd=myPwd;

ODBC

Standard:

"driver={IBM DB2 ODBC DRIVER};Database=myDbName;hostname=myServerName;port=myPortNum;protocol=TCPIP; uid=myUserName; pwd=myPwd"

Sybase

ODBC

Standard Sybase System 12 (or 12.5) Enterprise Open Client:

"Driver={SYBASE ASE ODBC Driver};Srvr=Aron1;Uid=username;Pwd=password"

Standard Sybase System 11:

"Driver={SYBASE SYSTEM 11};Srvr=Aron1;Uid=username;Pwd=password;Database=mydb"

For more information check out the Adaptive Server Enterprise Document Sets

Intersolv 3.10:

"Driver={INTERSOLV 3.10 32-BIT Sybase};Srvr=Aron1;Uid=username;Pwd=password;"

Sybase SQL Anywhere (former Watcom SQL ODBC driver):

"ODBC; Driver=Sybase SQL Anywhere 5.0; DefaultDir=c:\dbfolder\;Dbf=c:\mydatabase.db;Uid=username;Pwd=password;Dsn="""""

Note! The two double quota following the DSN parameter at the end are escaped quotas (VB syntax), you may have to change this to your language specific escape syntax. The empty DSN parameter is indeed critical as not including it will result in error 7778.

Read more in the Sybase SQL Anywhere User Guide (see part 3, chapter 13) >>

OLE DB

Adaptive Server Anywhere (ASA):

"Provider=ASAProv;Data source=myASA"

Read more in the ASA User Guide (part 1, chapter 2) >>

Adaptive Server Enterprise (ASE) with Data Source .IDS file:

"Provider=Sybase ASE OLE DB Provider; Data source=myASE"

Note that you must create a Data Source .IDS file using the Sybase Data Administrator. These .IDS files resemble ODBC DSNs.

Adaptive Server Enterprise (ASE):

"Provider=Sybase.ASEOLEDBProvider;Srvr=myASEserver,5000;Catalog=myDBname;User Id=username;Password=password"

- some reports on problem using the above one, try the following as an alternative -

"Provider=Sybase.ASEOLEDBProvider;Server Name=myASEserver,5000;Initial Catalog=myDBname;User Id=username;Password=password"

This one works only from Open Client 12.5 where the server port number feature works,燼llowing fully qualified connection strings to be used without defining燼ny .IDS Data Source files.

AseConnection (.NET)

Standard:

"Data Source='myASEserver';Port=5000;Database='myDBname';UID='username';PWD='password';"

Declare the AseConnection:

C#:

using Sybase.Data.AseClient;

AseConnection oCon = new AseConnection();

oCon.ConnectionString="my connection string";

oCon.Open();

VB.NET:

Imports System.Data.AseClient

Dim oCon As AseConnection = New AseConnection()

oCon.ConnectionString="my connection string"

oCon.Open()

Read more! Adaptive Server Enterprise ADO.NET Data Provider Documentation >>

Informix

ODBC

Informix 3.30:

"Dsn='';Driver={INFORMIX 3.30 32 BIT};Host=hostname;Server=myserver;Service=service-name;Protocol=olsoctcp;Database=mydb;UID=username;PWD=myPwd

Informix-CLI 2.5:

"Driver={Informix-CLI 2.5 (32 Bit)};Server=myserver;Database=mydb;Uid=username;Pwd=myPwd"

OLE DB

IBM Informix OLE DB Provider:

"Provider=Ifxoledbc.2;password=myPw;User ID=myUser;Data Source=dbName@serverName;Persist Security Info=true"

Ingres

ODBC

DSN-less

"Provider=MSDASQL.1;DRIVER=Ingres;SRVR=xxxxx;DB=xxxxx;Persist Security Info=False;uid=xxxx;pwd=xxxxx;SELECTLOOPS=N;Extended Properties="""SERVER=xxxxx;DATABASE=xxxxx;SERVERTYPE=INGRES""

Mimer SQL

ODBC

Standard Security:

"Driver={MIMER};Database=mydb;Uid=myuser;Pwd=mypw;"

Prompt for username and password:

"Driver={MIMER};Database=mydb;"

Lightbase

Standard

Standard:

"user=USERLOGIN;password=PASSWORD;UDB=USERBASE;server=SERVERNAME"

PostgreSQL

Core Labs PostgreSQLDirect (.NET)

Standard:

"User ID=root; Password=pwd; Host=localhost; Port=5432; Database=testdb;Pooling=true; Min Pool Size=0; Max Pool Size=100; Connection Lifetime=0"

Read more at Core Lab and the product page.

PostgreSQL driver

Standard:

"DRIVER={PostgreSQL};SERVER=ipaddress;port=5432;DATABASE=dbname;UID=username;PWD=password;"

Npgsql by pgFoundry (.NET)

SSL activated:

"Server=127.0.0.1;Port=5432;Userid=myuserid;password=mypw;Protocol=3;SSL=true;Pooling=true;MinPoolSize=3;MaxPoolSize=20;Encoding=UNICODE;Timeout=20;SslMode=Require"

Without SSL:

"Server=127.0.0.1;Port=5432;Userid=myuserid;password=mypw;Protocol=3;SSL=false;Pooling=true;MinPoolSize=1;MaxPoolSize=20;Encoding=UNICODE;Timeout=15;SslMode=Disable"

Read more in the Npgsql: User's Manual and on the pgFoundry website.

Paradox

ODBC

5.X:

Driver={Microsoft Paradox Driver (*.db )};DriverID=538;Fil=Paradox 5.X;DefaultDir=c:\pathToDb\;Dbq=c:\pathToDb\;CollatingSequence=ASCII"

7.X:

"Provider=MSDASQL.1;Persist Security Info=False;Mode=Read;Extended Properties='DSN=Paradox;DBQ=C:\myDb;DefaultDir=C:\myDb;DriverId=538;FIL=Paradox 7.X;MaxBufferSize=2048;PageTimeout=600;';Initial Catalog=C:\myDb"

OleDbConnection (.NET)

Standard

"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=c:\myDb;Extended Properties=Paradox 5.x;"

MS kb-article: How to use Paradox data with Access and Jet >>

DSN

ODBC

DSN:

"DSN=myDsn;Uid=username;Pwd=;"

File DSN:

"FILEDSN=c:\myData.dsn;Uid=username;Pwd=;"

Firebird

ODBC - IBPhoenix Open Source

Standard:

"DRIVER=Firebird/InterBase(r) driver;UID=SYSDBA;PWD=masterkey;DBNAME=D:\FIREBIRD\examples\TEST.FDB"

IBPhoenix ODBC; More info, download etc >>

.NET - Firebird .NET Data Provider

Standard:

"User=SYSDBA;Password=masterkey;Database=SampleDatabase.fdb;DataSource=localhost;Port=3050;Dialect=3;Charset=NONE;Role=;Connection lifetime=15;Pooling=true;MinPoolSize=0;MaxPoolSize=50;Packet Size=8192;ServerType=0"

Firebird ADO.NET project >>

Firebird ADO.NET downloads >>

Excel

ODBC

Standard:

"Driver={Microsoft Excel Driver (*.xls)};DriverId=790;Dbq=C:\MyExcel.xls;DefaultDir=c:\mypath;"

TIP! SQL syntax: "SELECT * FROM [sheet1$]" - i.e. worksheet name followed by a "$" and wrapped in "[" "]" brackets.

OLE DB

Standard:

"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\MyExcel.xls;Extended Properties=""Excel 8.0;HDR=Yes;IMEX=1"""

"HDR=Yes;" indicates that the first row contains columnnames, not data

"IMEX=1;" tells the driver to always read "intermixed" data columns as text

TIP! SQL syntax: "SELECT * FROM [sheet1$]" - i.e. worksheet name followed by a "$" and wrapped in "[" "]" brackets.

Text

ODBC

Standard:

"Driver={Microsoft Text Driver (*.txt; *.csv)};Dbq=c:\txtFilesFolder\;Extensions=asc,csv,tab,txt;"

OLE DB

Standard:

"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=c:\txtFilesFolder\;Extended Properties=""text;HDR=Yes;FMT=Delimited"""

"HDR=Yes;" indicates that the first row contains columnnames, not data

DBF / FoxPro

ODBC

standard:

"Driver={Microsoft dBASE Driver (*.dbf)};DriverID=277;Dbq=c:\mydbpath;"

OLE DB, OleDbConnection (.NET)

standard:

"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=c:\folder;Extended Properties=dBASE IV;User ID=Admin;Password="

AS/400 (iSeries)

OLE DB, OleDbConnection (.NET)

IBM Client Access OLE DB provider:

"PROVIDER=IBMDA400; DATA SOURCE=MY_SYSTEM_NAME;USER ID=myUserName;PASSWORD=myPwd"

Where MY_SYSTEM_NAME is the name given to the system connection in OperationsNavigator

IBM Client Access OLE DB provider:

"PROVIDER=IBMDA400; DATA SOURCE=MY_SYSTEM_NAME;USER ID=myUserName;PASSWORD=myPwd;DEFAULT COLLECTION=MY_LIBRARY;"

Where MY_SYSTEM_NAME is the name given to the System Connection, and MY_LIBRARY is the name given to the library in iSeries Navigator.

ODBC

IBM Client Access ODBC driver:

"Driver={Client Access ODBC Driver (32-bit)};System=my_system_name;Uid=myUserName;Pwd=myPwd"

Exchange

OLE DB

Exchange OLE DB provider:

"ExOLEDB.DataSource"

Specify store in the connection open command like this: conn.open "http://servername/mypublicstore"

Check out this article at msdn >> and this one at Addison-Wesley >>

Visual FoxPro

OLE DB, OleDbConnection (.NET)

Database container (.DBC):

"Provider=vfpoledb.1;Data Source=C:\MyDbFolder\MyDbContainer.dbc;Collating Sequence=machine"

Free table directory:

"Provider=vfpoledb.1;Data Source=C:\MyDataDirectory\;Collating Sequence=general"

Force the provider to use an ODBC DSN:

""Provider=vfpoledb.1;DSN=MyDSN""

Read more (Microsoft msdn) >>

ODBC

Database container (.DBC):

"Driver={Microsoft Visual FoxPro Driver};SourceType=DBC;SourceDB=c:\myvfpdb.dbc;Exclusive=No;NULL=NO;Collate=Machine;BACKGROUNDFETCH=NO;DELETED=NO"

Free Table directory:

"Driver={Microsoft Visual FoxPro Driver};SourceType=DBF;SourceDB=c:\myvfpdbfolder;Exclusive=No;Collate=Machine;NULL=NO;DELETED=NO;BACKGROUNDFETCH=NO"

"Collate=Machine" is the default setting, for other settings check the list of supported collating sequences >>

Pervasive

ODBC

Standard:

"Driver={Pervasive ODBC Client Interface};ServerName=srvname;dbq=@dbname"

Pervasive ODBC info >>

OLE DB

Standard:

"Provider=PervasiveOLEDB;Data Source=C:\path"

Pervasive OLE DB info >>

UDL

UDL

UDL:

"File Name=c:\myDataLink.udl;"

连接到 SQL Server Express 版数据库

通过将数据库服务器指定为本地 SQL Server Express 版数据源，您可以连接到 SQL Server Express 版数据库，就像您连接到任何 SQL Server 数据库一样。例如，下面的连接字符串连接到一个名为 Customers 的数据库。

Data Source=.\SQLEXPRESS;Initial Catalog=Customers;Integrated Security=True;

通过使用代替 InitialCatalog 或 Database 连接字符串属性的 AttachDBFilename 连接字符串属性，您也可以指定一个要附加到的数据库文件。通过使用文件名连接到数据库可以简化将数据库与应用程序一起部署的工作(假如目标服务器运行的是 SQL Server Express 版)。例如，下面的连接字符串连接到存储在 Customers.mdf 文件中的数据库。

Data Source=.\SQLEXPRESS;AttachDbFileName=e:\data\Customers.mdf;Integrated Security=True;User Instance=True

ASP.NET 提供了用于在 Web 应用程序的 App_Data 目录中存储数据的便捷选项。App_Data 目录的内容不会在响应 Web 请求时提供，从而提高了应用程序的数据安全性。另外一种方便性是，您可以提供 |DataDirectory| 连接字符串变量，以代替应用程序的 App_Data 目录的文件路径。当打开到数据库的连接时，ASP.NET 功能(如 SqlDataSource 控件或用于成员资格、角色、用户配置文件、Web 部件个性化设置等的提供程序)自动将 App_Data 目录的文件路径替换为 |DataDirectory| 连接字符串变量。如果将 Web 应用程序移动到另一个目录，这可以确保数据库的路径保持最新。下面的代码示例演示一个包含 |DataDirectory| 连接字符串变量的连接字符串。

Data Source=.\SQLEXPRESS;AttachDbFileName=|DataDirectory|Customers.mdf;Integrated Security=True;User Instance=True

注意:当您与 User Instance 设置为 true 的连接字符串进行连接时，SQL Server Express 版只允许有单个连接连到 .mdf 文件。