Posts
Using pyparsing
The day after I hyped the Getting Started with PyParsing book, I got to use it. Here’s the script : from pyparsing import SkipTo, Suppress, CaselessLiteral import glob # Example to match # delete from TABLENAME # where CUSTOMER_ID = 'INTERNAL'; table_name = SkipTo("where") where_clause = SkipTo(';') delete_stmt = Suppress("delete") + Suppress("from") + table_name + Suppress("where") + where_clause + Suppress(";") for filename in glob.glob('*.sql'): f = open(filename) print '-- ', filename, ':' lines=f.
NLS_LANG settings
To get the language setting of the current session : SELECT USERENV ('language') FROM DUAL; This returns the database character set, not the user’s though. The NLS settings can be found in the following list, in this order. If a value is specified in NLS_SESSION_PARAMETERS, it has preference over a value in NLS_INSTANCE_PARAMETERS. NLS_SESSION_PARAMETERS NLS_INSTANCE_PARAMETERS NLS_DATABASE_PARAMETERS
PyParsing
I just bought and read the Getting Started with Pyparsing PDF book. And it’s good. PyParsing is a way of building a parser using Python code. You should think Yacc/Lex, but readable. It can be used to parse text, and it can also handle HTML. This is the example from the PyParsing website : from pyparsing import Word, alphas greet = Word( alphas ) + "," + Word( alphas ) + "!
TNS_ADMIN
By default Oracle expects tnsnames.ora to be in the $ORACLE_HOME\network\admin directory. This is not always the most convenient place, especially because that directory is usually owned by the oracle user. To get around this, you can set the TNS_ADMIN variable. This points to the directory where you have put your own copy of tnsnames.ora . Like they say on TV : darn useful.
Greece
I just spent a few days in Greece, visiting Athens, Sounio and Delphi.
The temple of Hephaistos in the ancient Greek agora in Athens