HChangeConnection (Example)

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Example 1: Describing a connection on SQL Server via OLE DB
Example 2: Description of an ODBC connection to SQL Server via OLE DB
Example 3: Description of a connection to HFSQL Classic data files

HChangeConnection (Example)

See the associated help page

Example 1: Describing a connection on SQL Server via OLE 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 SQLServer
HReadFirst("Salaires")
...
// Fermer la connexion
HCloseConnection("Salaire")

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

// Ouvrir la table "Salaires" sur Oracle
HOpen("Salaires")

Example 2: Description of an ODBC connection to SQL Server via OLE DB

The company database is on Oracle. The programmer wants to runt the test of his program on an SQL Server database by using the ODBC access via OLE DB.

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 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 SQLServer
HReadFirst("Salaires")
...
// Fermer la connexion
HCloseConnection("Salaire")
// 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

The company database is on Oracle. The developer wants to run the tests of his program on HFSQL Classic data files.

Without modifying the analysis, you have the ability to change the connection used by the file.

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 pseudo-connection (using an HFSQL Classic database) will have the following parameters:

datasource: "c:ASLASH_Tmp"
database: ""
user: ""
password: ""
provider: hAccèsHF7

// Décrire la nouvelle connexion
HDescribeConnection ("MaConnexion", "", "", "c:\tmp", "", ...
	hAccessHF7, hOReadWrite, "")
// Indiquer que "Salaires" utilise la nouvelle connexion
HChangeConnection("Salaires", "MaConnexion")
// Commencer le parcours de la table "Salaires" sur SQLServer
HReadFirst("Salaires")
...
// Fermer le fichier
HClose("Salaires")
...
// Rétablir l'utilisation de la connexion sur Oracle
HChangeConnection("Salaires", "")
// Ouvrir la table "Salaires" sur Oracle
HOpen("Salaires")