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Help / WLanguage / Managing databases / HFSQL / HFSQL functions
  • Example 1: Describing a connection on SQL Server via OLE DB
  • Example 2: Describing a connection on SQL Server via OLE DB
  • Example 3: Description of a connection to HFSQL Classic data files
  • Example 4: Description of a connection to an Access file (MDB)
HDescribeConnection (Example)
Example 1: Describing a connection on SQL Server via OLE DB
Reports and QueriesWindowsOLE DB
In this example, the company database is on Oracle. The programmer wants to run the test of his program on an SQL Server database.
In the analysis, an OLEDB connection was associated with the "Salaries" OLE DB table on Oracle.
The properties of this connection are:
datasource: Oracle_Server
user: dupont
password: toto
provider: OraOLEDB.Oracle
The new connection to the SQL Server database will have the following parameters:
datasource: "Server_SQLServer"
database: "dbo"
user: ""
password: ""
provider: "SQLOLEDB"
Note: On SQLServer, you can define a database internal to the server data source.
// Décrire la nouvelle connexion
HDescribeConnection("MaConnexion", "", "", "Serveur_SQLServer", ...
		"dbo", hOledbSQLServer, hOReadWrite, "")

// Ouvrir la nouvelle connexion
HOpenConnection("MaConnexion")

// Indiquer que "Salaires" utilise la nouvelle connexion
HChangeConnection("Salaires", "MaConnexion")
// Commencer le parcours de la table "Salaires" sur SQL Server
HReadFirst("Salaires")
...
// Ferme le fichier : la connexion utilisée par le fichier "Salaires"
// a été ouverte par HOuvreConnexion. Elle ne sera pas fermée 
// lors de la fermeture du fichier "Salaires". 
HClose("Salaires")
...
// Ré-ouverture rapide car la connexion est toujours ouverte
HOpen("Salaires")

// Fermer la connexion
HCloseConnection("MaConnexion")

// Rétablir l'utilisation de la connexion sur Oracle
HChangeConnection("Salaires", "")

// Ouvrir la table "Salaires" sur Oracle
HOpen("Salaires")
Example 2: Describing a connection on SQL Server via OLE DB
WindowsOLE DB
The company database is on Oracle. The programmer wants to run the test of his program on an SQL Server database by using the ODBC access
Without modifying the analysis, you have the ability to change the connection used by the file.
Note: "ODBCSQLServer" is an ODBC data source declared in Windows ODBC data sources
// Décrire et ouvrir la nouvelle connexion
HDescribeConnection("MaConnexion", "", "", "Serveur_SQLServer", ...
		"dbo", hODBC, hOReadWrite, "")
HOpenConnection("MaConnexion")

// Indiquer que "Salaires" utilise la nouvelle connexion
HChangeConnection("Salaires", "MaConnexion")

// Commencer le parcours de la table "Salaires" sur SQLServer
HReadFirst("Salaires")
...

// Fermer la connexion
HCloseConnection("MaConnexion")

// Rétablir l'utilisation de la connexion sur Oracle
HChangeConnection("Salaires", "")
// Ouvrir la table "Salaires" sur Oracle
HOpen("Salaires")
Example 3: Description of a connection to HFSQL Classic data files
Example 4: Description of a connection to an Access file (MDB)
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Last update: 03/27/2025

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