These functions allow you to access Ingres II database servers.
Note:
If you already used PHP extensions to access other database
servers, note that Ingres doesn't allow concurrent queries and/or
transaction over one connection, thus you won't find any result
or transaction handle in this extension. The result of a query
must be treated before sending another query, and a transaction
must be committed or rolled back before opening another
transaction (which is automatically done when sending the first
query).