DomEL expressions are used in different contexts for different purposes. The expected return type depends on where the expression appears:
|
Appears In |
Expected Return Type |
Explanation |
|
Join expression |
Boolean |
Within a join expression, the on clause contains a comparison of fields from each table that has a boolean result. The on clause may also contain other DomEL expressions logically associated with and or or to create a complex join condition. |
|
Calculated field |
any type |
The expression must evaluate to a type that is compatible with the SQL type declared in the Domain Designer or in the design file. For example, if the declared type is java.lang.Float, the expression must compute a decimal value. |
|
Boolean |
Filters must be true or false overall. When there are several conditions, they must be logically associated with and or or (currently, only and is supported in the Domain Designer). |
