Re: Validation

From: Robert Zeigler (robert.zeigle..oxanemy.com)
Date: Mon Apr 13 2009 - 19:38:27 EDT

  • Next message: Weddle, Anthony: "RE: Validation"

    Constraint information is available by examining the ObjEntity and
    DbEntity objects corresponding to the given object class.
    I used this in the tapestry5-cayenne integration module (t5cayenne)
    to have tapestry automatically pick up the relevant data constraints
    Note: currently, t5cayenne supports the required constraint for any
    field type, the maxlength constraint for only string types, and no
    other constraints. This is due to what I was interested in supporting
    at the time I wrote it rather than to some fundamental limitation; any
    remaining constraints will likely be added at some point in the
    future. All of those caveats notwithstanding, you can take a look at
    the code for ideas:

    http://code.google.com/p/tapestry5-cayenne/source/browse/trunk/tapestry5-cayenne-core/src/main/java/com/googlecode/tapestry5cayenne/services/CayenneConstraintGenerator.java

    Robert

    On Apr 13, 2009, at 4/136:26 PM , Weddle, Anthony wrote:

    > The documentation talks of removing validation as a concern of the
    > GUI,
    > by using object validation that gets done before any commits. However,
    > validation can continue to be needed in the GUI since it is always
    > nicer
    > to let users know of problems early on (such as the maximum length
    > of a
    > value, that a value must be a number or a value must not be null, as
    > well as business validation). Is there some way to have database
    > constraints visible to the GUI developer, perhaps through use of the
    > class generation templates (by adding constraints as constants in the
    > superclass, for example)?
    >
    >
    >
    > Thanks,
    >
    > Tony
    >
    >
    >
    >
    >
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