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                                  • Description:
                                    I am using XpoDefault.GetDataLayer method to initialize the Data Access Layer in my application. How can I properly build a connection string for any supported database provider?

                                    It 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;Data Source=\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
                                    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
                                    ODPManagedConnectionProvider: ODPManaged
                                    XpoProvider=ODPManaged;Data Source=TORCL;User ID=MyUserName;Password=MyPassword
                                    OracleConnectionProvider: Oracle
                                    XpoProvider=Oracle;Data Source=TORCL;User ID=MyUserName;Password=MyPassword
                                    PervasiveSqlConnectionProvider: Pervasive
                                    PostgreSqlConnectionProvider: Postgres
                                    XpoProvider=Postgres;Server=;User ID=MyUserName;Password=MyPassword;Database=MyDatabase;Encoding=UNICODE
                                    SQLiteConnectionProvider: SQLite
                                    XpoProvider=SQLite;Data Source=filename
                                    VistaDBConnectionProvider: VistaDB
                                    XpoProvider=VistaDB;Data Source=C:\mydatabase.vdb4
                                    VistaDB5ConnectionProvider: VistaDB5
                                    XpoProvider=VistaDB5;Data Source=C:\mydatabase.vdb5
                                    VistaDB6ConnectionProvider: VistaDB6
                                    XpoProvider=VistaDB6;Data Source=C:\mydatabase.vdb6
                                    See 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

                                Show all comments
                                • Mr Ying LI 02.28.2015

                                  Sorry, I have a related question. Is there a dialog class to modify/change the existing connection string at run time?
                                  For XPO supports different databases, maybe DevExpress has built one already in the package.
                                  Thank you in advance,

                                • Alexey (DevExpress Support) 03.01.2015


                                  To process your recent post more efficiently, I created a separate ticket on your behalf: T214377: Change connection at runtime. This ticket is currently in our processing queue. Our team will address it as soon as we have any updates.

                                • Wesam Abdallah (JPMC) 02.05.2016

                                  For ASE 15

                                  I get the following error

                                  Could not load type Sybase.Data.AseClient.AseConnection
                                • Jannet (DevExpress Support) 02.05.2016

                                  To handle your inquiry in the most efficient manner, let's continue our discussion at Could not load type Sybase.Data.AseClient.AseConnection​.

                                • Dhiogo Roberto 08.17.2016

                                  You can connect to excel files using ODBC? 

                                • Michael (DevExpress Support) 08.17.2016

                                  @Dhiogo: All existing XPO providers are based on the ADO.NET API. We don't have a built-in connection provider for ODBC. You can try to create a custom provider by implementing the IDataStore interface. Refer to the How to create a custom XPO connection provider and then use it in an XAF application article.
                                  Should you have additional questions, please submit a new ticket and describe your requirements in detail.

                                • Ário 03.19.2017

                                  How I connect to xls/xlsx files?


                                • Uriah (DevExpress Support) 03.20.2017

                                  Hi Aljr,

                                  I've created a separate ticket on your behalf (T494248: How to connect XPO xls/xlsx files). It has been placed in our processing queue and will be answered shortly.

                                • Jose Ojeda 09.01.2017

                                  I have been struggling for long time to generate the correct connection string, most of the time I have to google it and then do copy and paste.

                                  but after fall in love with Code Rush, I decided to create some shortcuts and templates for each connection string. You can download the templates from here


                                  you need to have installed code rush for Roslyn  

                                • Anatol (DevExpress Support) 09.01.2017

                                  Thank you for your contribution, Jose. We highly appreciate it.

                                • Liam Dawson 1 10.18.2017

                                  First of all I want to say that this thread was incredibly helpful for me. However, I have a small questions pertaining to the PostgreSQL connection string. When a Postgre connection is added to the custom connections it requires a ServerName, Username, Password, DatabaseName, and possibly a Port number. However, in the PostgreSQL Provider, there isn't a declaration of Port.  My question is thus, is there a second PostgreSQL Provider string if the Port is set, or is the port simply unneeded?

                                • Liam Dawson 1 10.18.2017

                                  Additionally, I just noticed the same issue with the MySQL connections as well.

                                • Uriah (DevExpress Support) 10.19.2017

                                  Hello Liam,

                                  I've created a separate ticket on your behalf (T566679: Is there a second PostgreSQL Provider string if the Port is set, or is the port simply unneeded). It has been placed in our processing queue and will be answered shortly.

                                • Alessandro Moura 10.14.2019

                                  Anyone can tell me if only ODPMAnaged from nuget is required to use XpressModel Wizard? Or I will need to install ODP.NET to use the design tool, then refer to ODPManaged when deploying?

                                • Uriah (DevExpress Support) 10.14.2019

                                  Hello Alessandro,

                                  I've created a separate ticket on your behalf (T823472: Which assemblies are required to use XPO Data Model Wizard). It has been placed in our processing queue and will be answered shortly.

                                • Alex Miller 10.15.2019

                                  @Anatol Typo:
                                  VistaDB5ConnectionProvider: VistaDB6
                                  XpoProvider=VistaDB6;Data Source=C:\mydatabase.vdb6

                                • Uriah (DevExpress Support) 10.15.2019

                                  Thank you, Alex!

                                0 Solutions

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