(Quick Reference)
countBy*
Purpose
Dynamic method that uses the properties of the domain class to allow the creation of Grails query method expressions that count the number of records returned
Examples
Given the domain class
Book:
class Book {
Long id
Long version
String title
Date releaseDate
String author
}The following are all possible:
def c = Book.countByTitle("The Shining")
c = Book.countByTitleAndAuthor("The Sum of All Fears", "Tom Clancy")
c = Book.countByReleaseDateBetween(firstDate, new Date())
c = Book.countByReleaseDateGreaterThanEquals(firstDate)
c = Book.countByTitleLike("%Hobbit%")
c = Book.countByTitleNotEqual("Harry Potter")
c = Book.countByReleaseDateIsNull()
c = Book.countByReleaseDateIsNotNull()Description
GORM supports the notion of
Dynamic Finders. The
countBy* method counts the number of records for the given expression and returns the result.
The following operator names can be used within the respective dynamic methods:
LessThanLessThanEqualsGreaterThanGreaterThanEqualsBetweenLikeIlike (i.e. ignorecase like)IsNotNullIsNullNotEqualNotEqualAndOr
The above operator names can be considered keywords, and you will run into problems when querying domain classes that have one of these names used as property names. For more information on
dynamic finders refer to the user guide.
