Package gavo :: Package base :: Module typesystems

Module typesystems

Conversions between type systems.

The DC software has to deal with a quite a few type systems:

Python
SQL
Postgres pg_type
VOTable
XSD
Twisted formal
numpy

Based on the (stinking) framework of utils.typeconversions, this module contains converters between them as necessary. The linuga franca of our type systems is SQL+extensions as laid down in utils.typeconversions.

Classes
	FromSQLConverter is an abstract base class for type converters from the SQL type system.
	ConversionError

Functions

sqltypeToVOTable(sqlType)

source code

voTableToSQLType(type, arraysize, xtype=None)

source code

sqltypeToPG(type)
returns a postgres type for one of our internal SQL types.

source code

sqltypeToXSD(sqlType)

source code

sqltypeToNumpy(sqlType)

source code

sqltypeToPython(sqlType)

source code

sqltypeToPythonCode(sqlType)

source code

sqltypeToPgValidator(sqlType)

source code

pythonToLiteral(type)

source code

Function Details

sqltypeToPG(type)

source code

returns a postgres type for one of our internal SQL types.

This is really only necessary because of our UNICODE hack. And it shouldn't become more complex than this.

>>> sqltypeToPG("INT[23, 42]")
'INT[23, 42]'
>>> sqltypeToPG("uniCode[23]")
'TEXT[23]'