Help in building an Expression

Question

Hi,
Would really appreciate help on this one.
I am trying to write an expression that generates the following SQL:
select count (*)
from ntf_messages a, ga_languages b, ga_language_code c
where a.language_id = b.language_id
and b.language_code_id = c.language_code_id
and length(a.MESSAGE_TEXT) > 1 * (1120/c.BITS_PER_CHARACTER)
This is a simple 3 tables join with a mathematical expression that I am not sure how to implement - I was trying to use the ExpressionMath.divide(..) method, but it divides an expression by a number and not a number by expression..
My objects' structures is:
I have a notificationMessage object that has a m_messageText member of type String (mapped to a.MESSAGE_TEXT) and a m_Language member which is an embedde object of type Language.
The language object has got an m_languageCode member which is an embedded object of type LanguageCode.
The languageCode object has got a member m_bitsPerCharacter which is of type int and is mapped to the table field BITS_PER_CHARACTER of the table: ga_language_code.
I was trying to write something in the form of:
ExpressionBuilder builder = new ExpressionBuilder(NotificationMsg.class);
ReportQuery reportQuery = new ReportQuery();
reportQuery.setReferenceClass(NotificationMsg.class);
reportQuery.setSelectionCriteria(builder.get("m_messageText").length().greaterThan(1 * 1120 / builder.get("m_language.m_languageCode.m_bitsPerCharacter")) );
But this is wrong since I am dividing a number by expression, and obviously it cannot be done.
Thanks in advance for any help in building this expression,
Michal

Answer 1

I was trying to use the ExpressionMath.divide(..) method, but it divides an expression by a number and not a number by expression..This method also takes an Expression and Object parameter, which can be another expression. You can also use the Expression.value(Object) method to create an expression from a number.
reportQuery.setSelectionCriteria(builder.get("m_messageText").length().greaterThan(1 * 1120 / builder.get("m_language.m_languageCode.m_bitsPerCharacter")) );Try,
reportQuery.setSelectionCriteria(
builder.get("m_messageText").length().greaterThan(
ExpressionMath.multiply(
ExpressionMath.divide(
builder.value(1),
builder.get("m_language.m_languageCode.m_bitsPerCharacter")),
1)));