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  • Overview
  • Defining the connections from the data model editor
  • Encrypting a connection
  • Defining the connections through programming
  • Defining a connection with HDescribeConnection or HOpenConnection
  • Defining a connection via the Connection type
  • Allowing a WINDEV application to use an HFSQL Client/Server database or an HFSQL Classic database
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Stored procedures
Overview
In order for the application to be able to handle the data files found on the HFSQL server, the connection that will be used by the application must be defined in the project. The connection can be defined:
  • from the data model editor.
  • through programming.
You also have the ability to allow an application to use a HFSQL Client/Server database or a HFSQL Classic database.
The data files accessed by an HFSQL server are accessible via this server only. They cannot be directly accessed by another application especially via the HFSQL Classic engine. A connection to the server is required to access these data files.
Remark: Several connections can be defined if the application is using several databases or several servers. Remark: From version 19, HFSQL is the new name of HyperFileSQL.
Defining the connections from the data model editor
To define a connection from the data model editor:
  1. On the "Analysis" tab, in the "Connection" group, click "New connection". The wizard for defining a new connection starts.
  2. Keep "HFSQL Client/Server" and go to the next step of the wizard.
  3. In the different steps of the wizard, enter the requested information:
    • server name,
    • number of the network port,
    • name and password of the user,
    • database,
    • name and caption of the connection.
  4. Validate the wizard.
    A dialog box allows you to associate the data files with this new connection. Accept.
  5. Select the data files to associate and validate. The existing data files can be directly copied onto the HFSQL server. This operation can be performed later if necessary.
  6. Display the list of connections: on the "Analysis" tab, in the "Connection" group, click "Connections".
    • Run the test of this new connection if necessary: click the "Run the test" button.
    • The different tabs are used to view and modify the characteristics of the connections:
      • "Properties" tab: characteristics of the connection defined in the wizard (name, caption, type, ...)
      • "Advanced" tab: Port number of the connection, options for compressing and encrypting the connection data.
        If the data files that use the connection are encrypted, the connection should be encrypted as well.
      • "Used by" tab: List of data files that use the connection.
  7. Close the window of defined connections.
At run time, the connection associated with the data file used will be automatically opened during the first access to this data file.
Data files associated with an "HFSQL Client/Server" connection are automatically transformed into "HFSQL Client/Server" data files.
To identify them, a "HFSQL/CS" indication is displayed at the bottom of the graphic description of these files. Furthermore, the color associated with this area becomes orange:

Encrypting a connection

To encrypt a connection:
  1. Display the description of the connection: on the "Analysis" tab, in the "Connection" group, click "Connections".
  2. Select the connection to encrypt.
  3. Go to the "Advanced" tab.
  4. Select the encryption mode: Fast or RC5 (16 rounds).
  5. Validate.
Remark: If the data files that use the connection are encrypted, the connection should be encrypted as well.
Defining the connections through programming
Several methods can be used to define a connection through programming:

Defining a connection with HDescribeConnection or HOpenConnection

To define a connection with HDescribeConnection or HOpenConnection:
  1. Define the connection with the HDescribeConnection or HOpenConnection function.
    The <Data Source> parameter must correspond to the name or IP address of the server that will be used. If the network port to use differs from the default port (port 4900), <Data Source> must have the following format:
    "<NameOrIPAddressOfServer>:<PortNumber>".
    The <Provider OLEDB or Native Connector> parameter must match the constant hAccessHFClientServer.
    For example:
    HDescribeConnection("MaConnexion", "Julie", "MotDePasse", "MonServeurHF", ...
    "MaBaseDeDonnées", hAccessHFClientServer, hORead)

    or
    HOpenConnection("ConnexionServeur", "Stephane", "", "ServeurDonnées:5400", ...
    "MesDonnées", hAccessHFClientServer)
  2. Open the connection with HOpenConnection.
    This step is not required if the connection was defined and opened by HOpenConnection beforehand.
  3. Associate the connection to different data files with the HChangeConnection function.
    For example:
    HChangeConnection(Client, "MaConnexion")

    or, to associate all the analysis files with the connection:
    HChangeConnection("*", "ConnexionServeur")
Remark: To encrypt the connection, all you have to do is specify the specific extended information ("ENCRYPTION = FAST" or "ENCRYPTION = RC5_16". For more details, see the documentation about HDescribeConnection or HOpenConnection.

Defining a connection via the Connection type

To define a connection using the Connection type:
  1. Define the connection using the Connection type and its properties.
    For example:
    MaConnexion is Connection
    // Description de la connexion
    MaConnexion.User = "USER"
    MaConnexion.MotDePasse = "PASSWORD"
    MaConnexion.Server = "MONSERVEUR"
    MaConnexion.Database = "Base de données"
    MaConnexion.Provider = hAccessHFClientServer
    MaConnexion.Access = hOReadWrite
    MaConnexion.ExtendedInfo = "Infos étendues"
    MaConnexion.CursorOptions = hClientCursor
  2. Open the connection with HOpenConnection.
    For example:
    MaConnexion is Connection
    // Description de la connexion
    MaConnexion.User = "USER"
    MaConnexion.MotDePasse = "PASSWORD"
    MaConnexion.Server = "MONSERVEUR"
    MaConnexion.Database = "Base de données"
    MaConnexion.Provider = hAccessHFClientServer
    MaConnexion.Access = hOReadWrite
    MaConnexion.ExtendedInfo = "Infos étendues"
    MaConnexion.CursorOptions = hClientCursor
Remark: To encrypt the connection, all you have to do is use Cryptage on the connection.
For example:
MyConnection is Connection
// Describe the connection
MyConnection.User = "USER"
MyConnection.Password = "PASSWORD"
MyConnection.Server = "MYSERVER"
MyConnection.Database = "Database"
MyConnection.CryptMethod = hEncryptionRC5_16
MyConnection.Provider = hAccessHFClientServer
MyConnection.Access = hOReadWrite
MyConnection.ExtendedInfo = "Extended information"
 
HOpenConnection(MyConnection)
Allowing a WINDEV application to use an HFSQL Client/Server database or an HFSQL Classic database
Two WLanguage functions allow you to use any database chosen at runtime. Regardless of the type of data files specified in the analysis.
This can be very useful for an application installed on a laptop computer:
  • connected to the network, the application uses the HFSQL Client/Server database,
  • disconnected, the application uses a local copy of the database.
The code that should be used (at the beginning of project, before using the data files) is as follows:
AdresseServeur is string = "198.168.1.120"
 
IF Ping(AdresseServeur) THEN
// Le serveur est accessible, connexion HF C/S
HOpenConnection("ConnexionHFCS", "admin", "", AdresseServeur, "CRM", hAccessHFClientServer)
    HChangeConnection("*", "ConnexionHFCS")
    Info("Mode connecté à la base réseau.")
ELSE
  // Le serveur ne répond pas, utilisation de la base HF locale
  HOpenConnection("ConnexionHFLocale", "", "", "C:\Répertoire Données\", "", hAccessHF7)
  HChangeConnection("*", "ConnexionHFLocale")
  Info("Mode déconnecté, vous utilisez vos données en local.")
END
Minimum version required
  • Version 9
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