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  • Example 1: Describing a connection on SQL Server via OLE DB
  • Example 2: Describing a connection on SQL Server via OLE DB
  • Example 3: Describing a connection on HFSQL Classic files
  • Example 4: Describing a connection on 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 a 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: Server_Oracle
user: smith
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"
Remark: On SQL Server, you can define a database internal to the data source that the server is.
// Describe the new connection
HDescribeConnection("MyConnection", "", "", "Server_SQLServer", ...
"dbo", hOledbSQLServer, hOReadWrite, "")
 
// Establish the new connection
HOpenConnection("MyConnection")
 
// Specify that "Salaries" is using the new connection
HChangeConnection("Salaries", "MyConnection")
// Start browsing the "Salaries" table on SQL Server
HReadFirst("Salaries")
...
// Closes the file: the connection used by the "Salaries" file
// was opened by HOpenConnection. It will not be closed
// when closing the "Salaries" file.
HClose("Salaries")
...
// Fast re-opening because the connection is still opened
HOpen("Salaries")
 
// Close the connection
HCloseConnection("MyConnection")
 
// Restore the use of connection on Oracle
HChangeConnection("Salaries", "")
 
// Open the "Salaries" table on Oracle
HOpen("Salaries")
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 a SQL Server database by using the ODBC access
Without modifying the analysis, you have the ability to change the connection used by the file.
Remark: "ODBCSQLServer" is an ODBC data source declared in the ODBC data sources of Windows
// Describe and open the new connection
HDescribeConnection("MyConnection", "", "", "Server_SQLServer", ...
"dbo", hODBC, hOReadWrite, "")
HOpenConnection("MyConnection")
 
// Specify that "Salaries" is using the new connection
HChangeConnection("Salaries", "MyConnection")
 
// Start browsing the "Salaries" table on SQLServer
HReadFirst("Salaries")
...
 
// Close the connection
HCloseConnection("MyConnection")
 
// Restore the use of connection on Oracle
HChangeConnection("Salaries", "")
// Open the "Salaries" table on Oracle
HOpen("Salaries")
Example 3: Describing a connection on HFSQL Classic files
Example 4: Describing a connection on an Access file (MDB)
Minimum version required
  • Version 9
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