How to get warning by using the previous value of the column and new value

Hi all,
Suppose the column A has the true and when I click on button which also sets the value of the column as true I should dispaly warning that column a is already true.How can I achieve this.How to store the original value of the column and then check wirth the new value.
Thanks in advance.

You dont have to store the value anywhere
You can do this from setMethod of EOImpl.java
eg:
void setAttributeXXX(String Value)
// value contains new value
// getAttributeXXX() contains oldValue
if (value.equals(getAttributeXXX()))
// Verify value is > 0 if (value.compareTo(0) <= 0)
throw new OAAttrValException(OAException.TYP_ENTITY_OBJECT, // indicates EO source
getEntityDef().getFullName(), // entity name
getPrimaryKey(), // entity primary key
"AttributeXXX", // attribute Name
value, // bad attribute value
"AK", // nessage application short name
"FWK_TBX_T_EMP_SALARY_REQUIRED"); // message name
setAttributeInternal(AttributeXXX, value);
--Prasanna

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FOR ASSISTANCE WITH ORDERS - iTUNES STORE CUSTOMER SERVICE
For assistance with billing questions or other order inquiries, please refer to our online support page by clicking here: http://www.apple.com/support/itunes/store/. If you cannot find the answers you are seeking in our robust knowledge base, you can contact us by visiting the following URL http://www.apple.com/support/itunes/store/, clicking on the appropriate Customer Service topic, then using the contact button or email form at the bottom of the page. Responses to emails will be provided as soon as possible.
Phone: 800-275-2273 How to reach a live person: Press 0 four times
Hours of Operation: Mon-Fri: 9am-5pm ET
Email: [email protected]
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http://support.apple.com/kb/HT1933
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http://gizmodo.com/5886683/how-to-get-a-refund-from-the-app-store
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http://gadgetwise.blogs.nytimes.com/2011/10/14/qa-canceling-a-digital-subscripti on/
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How to get warning by using the previous value of the column and new value

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