6:46 p.m.
One way would be to do dateOfBirth.time < nnnnnn
Where nnnnn is (new Date(-1900, 1,1)).getTime()
By the way be very very wary of Date objects coming back from the database and check what
the actual implementation class type is (and not the variable type). Even though
java.sql.Timestamp extends java.util.Date they don’t mix.
From the Javadocs
Note: This type is a composite of a java.util.Date and a separate nanoseconds value. Only
integral seconds are stored in the java.util.Date component. The fractional seconds - the
nanos - are separate. TheTimestamp.equals(Object) method never returns true when passed an
object that isn't an instance of java.sql.Timestamp, because the nanos component of a
date is unknown. As a result, theTimestamp.equals(Object) method is not symmetric with
respect to the java.util.Date.equals(Object) method. Also, the hashcode method uses the
underlying java.util.Date implementation and therefore does not include nanos in its
computation.
Due to the differences between the Timestamp class and the java.util.Date class mentioned
above, it is recommended that code not view Timestamp values generically as an instance of
java.util.Date. The inheritance relationship between Timestamp and java.util.Date really
denotes implementation inheritance, and not type inheritance.
We had great fun tracking down issues in our rules caused by this – our fields were Date
classes, but when fetched back from the database the instance type would be Timestamp.
The rules worked fine in unit tests and first execution (as they were all new objects the
type was java.util.Date) but not on subsequent executions when they were returned from the
DB!
Thomas
From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On
Behalf Of Nancy Henggeler
Sent: 09 February 2012 17:24
To: Rules Users List
Subject: Re: [rules-users] Low Date question in drools
It is a java date. We use some java binding objects to build it. Below is just a
sampling of this. The second entry below indicates what to name it in Java, it's java
type, what DB2 table (cogentTable) and data field it is coming from (cogentField). The
snippets below might not help much.
1) bindHistory((ECDField) object.getElement("dateOfBirth"),
this.getDateOfBirthHistory());
2) <attribute name="dateOfBirth">
<type>Date</type>
<cogenTable>W1V0</cogenTable>
<cogenField>BIRTH-DATE</cogenField>
<description>Date Of Birth</description>
</attribute>
From: Wolfgang Laun
<wolfgang.laun@gmail.com<mailto:wolfgang.laun@gmail.com>>
To: Rules Users List
<rules-users@lists.jboss.org<mailto:rules-users@lists.jboss.org>>
Date: 02/09/2012 11:00 AM
Subject: Re: [rules-users] Low Date question in drools
Sent by:
rules-users-bounces@lists.jboss.org<mailto:rules-users-bounces@lists.jboss.org>
________________________________
So what is the Java type of dateOfBirth, please?
-W
2012/2/9 Nancy Henggeler
<Nancy.Henggeler@fblfinancial.com<mailto:Nancy.Henggeler@fblfinancial.com>>
Hello Laun,
Thank you for your quick response. This date is a date coming from a DB2 date field and
is valid in my incoming data. Frankly, I am with you, why not null versus a silly low
date as such, arggggh. But since it is coming in as such do you know of a work around?
Thank so much,
Nancy
From: Wolfgang Laun
<wolfgang.laun@gmail.com<mailto:wolfgang.laun@gmail.com>>
To: Rules Users List
<rules-users@lists.jboss.org<mailto:rules-users@lists.jboss.org>>
Date: 02/09/2012 10:31 AM
Subject: Re: [rules-users] Low Date question in drools
Sent by:
rules-users-bounces@lists.jboss.org<mailto:rules-users-bounces@lists.jboss.org>
________________________________
Why would you want to test for January 1st in year 1? This is not a
value an object of type java.util.Date can represent. See that type's
javadoc for details, but the epoch begins January 1, 1970.
-W
On 9 February 2012 17:19, Nancy Henggeler
<nancy.henggeler@fblfinancial.com<mailto:nancy.henggeler@fblfinancial.com>>
wrote:
I have a simple rule where I want to bypass elements that have a low date but
drools seems to be interpreting the date different then I am expecting.
Drools statement and error follows:
ClientSupplement ( dateOfBirth : dateOfBirth != null && != 0001-01-01)
throws error -- Error: [Error: badly formatted number: For input string:
"001-01-01"] [Near : {... 0001-01-01 ....}] ^ [Line: 1, Column: 1]
How do I get drools to understand this low date? I have tried single,
double, and no quotes around the low date and all result in a similiar error
message. Please Help!
--
View this message in context:
http://drools.46999.n3.nabble.com/Low-Date-question-in-drools-tp3729940p3...
Sent from the Drools: User forum mailing list archive at Nabble.com.
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