July 2005
Intermediate to advanced
1032 pages
27h 10m
English
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Client 2—Adding Error Checking
If you look back to line 7 of Listing 17.1, you'll notice that client1 calls pgdb.connect() to connect to a PostgreSQL server. If anything goes wrong during this function call, Python will print a stack trace and abort the program.
If you want to intercept a connection error, you must wrap the call to pgdb.connect() in a try/except block. The Python DB-API specification defines a hierarchy of exception types that a conforming implementation may throw. The most general exception type is StandardError. All other DB-API exceptions are derived (directly or indirectly) from StandardError.
Listing 17.2 shows client2.py. This client calls pgdb.connect() inside of a try/except block and catches any exceptions derived from ...
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