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- Overview
- Defining the connections from the data model editor
- Encrypting a connection
- Defining the connections programmatically
- 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
Client/Server: Connecting client computers to the server
 Disponible solo con este tipo de conexión
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: - in the data model editor.
- through programming.
You also have the ability to allow an application to use an HFSQL Client/Server database or an 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. Note Multiple connections can be defined if the application uses several databases or servers. Defining the connections from the data model editor To define a connection from the data model editor: - On the "Análisis" tab, in the "Conexión" group, click "Nueva conexión". The wizard for defining a new connection starts.
- Keep "HFSQL Client/Server" and go to the next step of the wizard.
- 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.
- Finish the wizard.
A dialog box allows you to associate the data files with this new connection. Accept. - 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.
- Display the list of connections: under the "Análisis" pane, in the "Conexión" group, click on "Conexiones".
- Test this new connection if necessary: click on the "Test" button.
- The different tabs are used to view and modify the characteristics of the connections:
- Tab "Properties": connection characteristics defined in the wizard (name, label, type, ...)
- Tab "Advanced": Connection port number, connection data compression and encryption options.
If the data files that use the connection are encrypted, the connection should be encrypted as well. - Tab "Used by": List of data files using the connection.
- Close the window of defined connections.
At runtime, 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, an indication "HFSQL/CS" appears at the bottom of the graphic description of these data files. Furthermore, the color associated with this area becomes orange: Encrypting a connection To encrypt a connection: - Display the connection description: under the "Análisis" pane, in the "Conexión" group, click on "Conexiones".
- Select the connection to encrypt.
- Go to the "Advanced" tab.
- Select encryption mode: Fast or RC5 (16 loops).
- Validate.
Note: If the data files using the connection are encrypted, it is advisable to encrypt the connection as well. Defining the connections programmatically 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:
- Define the connection with HDescribeConnection or HOpenConnection.
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 <OLEDB Provider or Native Connector> parameter must correspond to the hAccessHFClientServer constant.
For example:
HDescribeConnection("MyConnection", "Julia", "Password", "MyHFServer", ...
"MyDatabase", hAccessHFClientServer, hORead)
or
HOpenConnection("ConnectionServer", "Stephen", "", "DataServer:5400", ...
"MyData", hAccessHFClientServer)
- Open the connection using the HOpenConnection function.
This step is not required if the connection was defined and opened by HOpenConnection beforehand.
- Associate the connection with the different data files using HChangeConnection.
For example:
HChangeConnection(Customer, "MyConnection")
or, to associate all analysis data files with the connection:
HChangeConnection("*", "ConnectionServer")
Note: To encrypt the connection, simply specify 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 - Define the connection using the Connection type and its properties.
For example:
MyConnection is Connection
// Describe the connection
MyConnection.User = "USER"
MyConnection.Password = "PASSWORD"
MyConnection.Server = "MYSERVER"
MyConnection.Database = "Database"
MyConnection.Provider = hAccessHFClientServer
MyConnection.Access = hOReadWrite
MyConnection.ExtendedInfo = "Extended information"
MyConnection.CursorOptions = hClientCursor
- Open the connection using the HOpenConnection function.
For example:
MyConnection is Connection
// Describe the connection
MyConnection.User = "USER"
MyConnection.Password = "PASSWORD"
MyConnection.Server = "MYSERVER"
MyConnection.Database = "Database"
MyConnection.Provider = hAccessHFClientServer
MyConnection.Access = hOReadWrite
MyConnection.ExtendedInfo = "Extended information"
MyConnection.CursorOptions = hClientCursor
Note To encrypt the connection, simply use the Encryption property on the connection. For example:
MyConnection is Connection
MyConnection.User = "USER"
MyConnection.Password = "PASSWORD"
MyConnection.Server = "MYSERVER"
MyConnection.Database = "Database"
MyConnection.Encryption = 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: ServerAddress is string = "198.168.1.120"
IF Ping(ServerAddress) THEN
// The server is accessible, HF C/S connection
HOpenConnection("HFCSConnection", "admin", "", ServerAddress, "CRM", hAccessHFClientServer)
HChangeConnection("*", "HFCSConnection")
Info("Connected mode to the network database.")
ELSE
// The server does not respond, use the local HF database
HOpenConnection("LocalHFConnection", "", "", "C:\Data Directory\", "", hAccessHF7)
HChangeConnection("*", "LocalHFConnection")
Info("Disconnected mode, you are using your data locally.")
END
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