Hi Jeff,
I know that the return type of a dynamic expression cannot be determined
in general. But what would be a pragmatic way to guess the return type
of an expression?
Can you give some examples of expressions you need to infer?
arithmetic operations: a + b / c
functions: sqrt(a)
logical
On Sat, Oct 24, 2009 at 3:22 PM, Christian Schmidt
christian2.schm...@gmx.de wrote:
Hi Jeff,
I'm going to assume that you have a way of determing the types of the
input variables a, b, and c. If not, well, I'm not sure how much help
this will be. You can use the IronPython parser classes to
On Mon, Oct 19, 2009 at 1:03 AM, Christian Schmidt
christian2.schm...@gmx.de wrote:
I know that the return type of a dynamic expression cannot be determined
in general. But what would be a pragmatic way to guess the return type
of an expression?
Can you give some examples of expressions you
Hi Vernon,
Maybe I'm missing the point -- are you trying to load data into an
existing data table, or to DEFINE a new data table?
Sorry for not clarifying this. I'm able to export to _new_ tables, which
will be created at runtime.
For existing tables we could easily work out with the
Hello,
we are using IronPython embedded into our application to evaluate user
defined expression. The variables used in the expressions are strongly
typed and the results need to be written back into a database.
I know that the return type of a dynamic expression cannot be determined
in
Christian Schmidt wrote:
Hello,
we are using IronPython embedded into our application to evaluate user
defined expression. The variables used in the expressions are strongly
typed and the results need to be written back into a database.
I know that the return type of a dynamic expression
...@lists.ironpython.com] On Behalf Of Michael Foord
Sent: Monday, October 19, 2009 4:21 AM
To: Discussion of IronPython
Subject: Re: [IronPython] Type analysis of expression
Christian Schmidt wrote:
Hello,
we are using IronPython embedded into our application to evaluate user
defined expression
Of Michael Foord
Sent: Monday, October 19, 2009 4:21 AM
To: Discussion of IronPython
Subject: Re: [IronPython] Type analysis of expression
Christian Schmidt wrote:
Hello,
we are using IronPython embedded into our application to evaluate user
defined expression. The variables used
Christian:
While Python is type agnostic, most databases are pretty fussy about what
you feed them. I presume that you need to convert the user's data into a
form acceptable to the database.
You do not specify what tool you are using to write your results to the
database, so I will provide
...@lists.ironpython.com] On Behalf Of Jonathan Hartley
Sent: Monday, October 19, 2009 7:19 AM
To: Discussion of IronPython
Subject: Re: [IronPython] Type analysis of expression
Hey all,
Stephen, I infer that Christian can't evaluate the expression yet. (If
he could, then deriving the type of the result would
: Monday, October 19, 2009 7:19 AM
To: Discussion of IronPython
Subject: Re: [IronPython] Type analysis of expression
Hey all,
Stephen, I infer that Christian can't evaluate the expression yet. (If
he could, then deriving the type of the result would be trivial)
Presumably
Hi all,
thanks for your discussion.
Actually I'm having an in-memory table of strongly typed columns. The
user can provide per-row (python-)expressions as additional columns. Now
if the user wants his result to be exported to a database (e.g. SQL
Server or Oracle) I need to set a type for
of IronPython
Subject: Re: [IronPython] Type analysis of expression
Hi all,
thanks for your discussion.
Actually I'm having an in-memory table of strongly typed columns. The
user can provide per-row (python-)expressions as additional columns. Now
if the user wants his result to be exported
Christian:
Maybe I'm missing the point -- are you trying to load data into an existing
data table, or to DEFINE a new data table?
I was assuming the former, a fairly easy case.
If you are trying to create Data Definition Language to create a new table,
then you have a real challenge. DDL is not
On Mon, Oct 19, 2009 at 12:12 PM, Christian Schmidt
christian2.schm...@gmx.de wrote:
When an
expression is parsed at runtime, the interpreter also needs to decide which
.NET-functions to call. For strongly typed input these functions should
normally have typed return values... Wouldn't this
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