.net的数据库连接字符串

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:/MyWeb5/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

发表于 2004年09月06日 12:25 PM

评论

#  回复：ADO.net 中数据库连接方式(微软提供) 2004-09-06 7:57 PM cry_out

利用odbc连接后，要用那个command呢？ sqlconnection 是sqlcommand, oledbconnection 是oledbconnection那么，利用odbc后，要用那个command呢？

#  回复：ADO.net 中数据库连接方式(微软提供) 2004-09-07 10:45 AM abao

当然有OdbcCommand

http://msdn.microsoft.com/library/en-us/cpref/html/frlrfSystemDataOdbcOdbcCommandClassTopic.asp?frame=true

For a list of all members of this type, see OdbcCommand Members.

System.Object
System.MarshalByRefObject
System.ComponentModel.Component
System.Data.Odbc.OdbcCommand

[Visual Basic]
NotInheritable Public Class OdbcCommand
Inherits Component
Implements ICloneable, IDbCommand
[C#]
public sealed class OdbcCommand : Component, ICloneable, IDbCommand
[C++]
public __gc __sealed class OdbcCommand : public Component,
ICloneable, IDbCommand
[JScript]
public class OdbcCommand extends Component implements ICloneable,
IDbCommand

#  回复：ADO.net 中数据库连接方式(微软提供) 2004-09-07 10:46 AM abao

[C#]
public void ReadMyData(string myConnString)
{
string mySelectQuery = "SELECT OrderID, CustomerID FROM Orders";
OdbcConnection myConnection = new OdbcConnection(myConnString);
OdbcCommand myCommand = new OdbcCommand(mySelectQuery,myConnection);
myConnection.Open();
OdbcDataReader myReader = myCommand.ExecuteReader();
try
{
while (myReader.Read())
{
Console.WriteLine(myReader.GetInt32(0) + ", " + myReader.GetString(1));
}
}
finally
{
// always call Close when done with connection.
myReader.Close();
// always call Close when done with connection.
myConnection.Close();
}
}