自己找到了！http://www.devexpress.com/Support/Center/kb/p/K18445.aspxIt is impossible to identify the database type by a connection string. So, XPO requires you to add an additional parameter into the connection string to specify the provider type. The parameter name is XpoProvider. So, the connection string will be like this: XpoProvider=Provider name;Connection string. You can obtain the provider name from a XpoProviderTypeString public constant. Each provider has this constant defined. Below is a list of values of the XpoProvider parameter for each existing database provider: AccessConnectionProvider: MSAccess XpoProvider=MSAccess;Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\mydatabase.mdb;User Id=admin;Password=; DataSetDataStore: XmlDataSet XpoProvider=XmlDataSet;Data Source=C:\mydatabase.xml;Read Only=false InMemoryDataStore: InMemoryDataStore XpoProvider=InmemoryDataStore;Data Source=C:\mydatabase.xml;Read Only=false MSSqlConnectionProvider: MSSqlServer XpoProvider=MSSqlServer;Data Source=(local);User ID=username;Password=password;Initial Catalog=database;Persist Security Info=true AdvantageConnectionProvider: Advantage XpoProvider=Advantage;\\myserver\myvolume\mypat\mydd.add;ServerType=local;User ID=ASSSYS;TrimTrailingSpaces=true AsaConnectionProvider: Asa XpoProvider=Asa;Uid=MyUsername;PWD=MyPassword;DBF=c:\mydatabase.db;Persist Security Info=true AseConnectionPrvider: Ase XpoProvider=Ase;Port=5000;Data Source=MyAseServer;User ID=MyUserName;Password=MyPassword;Initial Catalog=MyDatabase;Persist Security Info=true DB2ConnectionProvider: DB2 XpoProvider=DB2;Server=MyAddress:MyPortNumber;User ID=MyUserName;Password=MyPassword;Database=MyDatabase;Persist Security Info=true FirebirdConnectionProvider: Firebird XpoProvider=Firebird;DataSource=localhost;User=SYSDBA;Password=masterkey;Database=MyDatabase.fdb;ServerType=0;Charset=NONE MSSqlCEConnectionProvider: MSSqlServerCE XpoProvider=MSSqlServerCE;Data Source=MyDatabase.sdf;Password=MyPassword MySqlConnectionProvider: MySql XpoProvider=MySql;Server=MyServerAddress;User ID=MyUserName;Password=MyPassword;Database=MyDatabase;Persist Security Info= true;Charset=utf8 ODPConnectionProvider: ODP XpoProvider=ODP;Data Source=TORCL;User ID=MyUserName;Password=MyPassword OracleConnectionProvider: Oracle XpoProvider=Oracle;Data Source=TORCL;User ID=MyUserName;Password=MyPassword PervasiveSqlConnectionProvider: Pervasive XpoProvider=Pervasive;Server=MyServerAddress;UID=MyUserName;PWD=MyPassword;ServerDSN=MyDatabase PostgreSqlConnectionProvider: Postgres XpoProvider=Postgres;Server=127.0.0.1;User ID=MyUserName;Password=MyPassword;Database=MyDatabase;Encoding=UNICODE SQLiteConnectionProvider: SQLite XpoProvider=SQLite;Data Source=filename VistaDBConnectionProvider: VistaDB XpoProvider=VistaDB;Data Source=C:\mydatabase.vdb4See Also: How to connect XPO to a database other than SQL Server or Access Database Engines Supported by XPO The Connection String Reference How to use MS SQL Server instead of MS Access as a persistent storage
AccessConnectionProvider: MSAccess
XpoProvider=MSAccess;Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\mydatabase.mdb;User Id=admin;Password=;
DataSetDataStore: XmlDataSet
XpoProvider=XmlDataSet;Data Source=C:\mydatabase.xml;Read Only=false
InMemoryDataStore: InMemoryDataStore
XpoProvider=InmemoryDataStore;Data Source=C:\mydatabase.xml;Read Only=false
MSSqlConnectionProvider: MSSqlServer
XpoProvider=MSSqlServer;Data Source=(local);User ID=username;Password=password;Initial Catalog=database;Persist Security Info=true
AdvantageConnectionProvider: Advantage
XpoProvider=Advantage;\\myserver\myvolume\mypat\mydd.add;ServerType=local;User ID=ASSSYS;TrimTrailingSpaces=true
AsaConnectionProvider: Asa
XpoProvider=Asa;Uid=MyUsername;PWD=MyPassword;DBF=c:\mydatabase.db;Persist Security Info=true
AseConnectionPrvider: Ase
XpoProvider=Ase;Port=5000;Data Source=MyAseServer;User ID=MyUserName;Password=MyPassword;Initial Catalog=MyDatabase;Persist Security Info=true
DB2ConnectionProvider: DB2
XpoProvider=DB2;Server=MyAddress:MyPortNumber;User ID=MyUserName;Password=MyPassword;Database=MyDatabase;Persist Security Info=true
FirebirdConnectionProvider: Firebird
XpoProvider=Firebird;DataSource=localhost;User=SYSDBA;Password=masterkey;Database=MyDatabase.fdb;ServerType=0;Charset=NONE
MSSqlCEConnectionProvider: MSSqlServerCE
XpoProvider=MSSqlServerCE;Data Source=MyDatabase.sdf;Password=MyPassword
MySqlConnectionProvider: MySql
XpoProvider=MySql;Server=MyServerAddress;User ID=MyUserName;Password=MyPassword;Database=MyDatabase;Persist Security Info= true;Charset=utf8
ODPConnectionProvider: ODP
XpoProvider=ODP;Data Source=TORCL;User ID=MyUserName;Password=MyPassword
OracleConnectionProvider: Oracle
XpoProvider=Oracle;Data Source=TORCL;User ID=MyUserName;Password=MyPassword
PervasiveSqlConnectionProvider: Pervasive
XpoProvider=Pervasive;Server=MyServerAddress;UID=MyUserName;PWD=MyPassword;ServerDSN=MyDatabase
PostgreSqlConnectionProvider: Postgres
XpoProvider=Postgres;Server=127.0.0.1;User ID=MyUserName;Password=MyPassword;Database=MyDatabase;Encoding=UNICODE
SQLiteConnectionProvider: SQLite
XpoProvider=SQLite;Data Source=filename
VistaDBConnectionProvider: VistaDB
XpoProvider=VistaDB;Data Source=C:\mydatabase.vdb4See Also:
How to connect XPO to a database other than SQL Server or Access
Database Engines Supported by XPO
The Connection String Reference
How to use MS SQL Server instead of MS Access as a persistent storage