(Quick Reference)
countBy*
目的
Purpose
Dynamic method that uses the properties of the domain class to query for the count of the number of matching records
使用例
Examples
Given the domain class
Book:
class Book {
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()詳細
Description
GORM supports the notion of
Dynamic Finders. The
countBy* method counts the number of records for the given expression
The following operator names can be used within the respective dynamic methods:
LessThanLessThanEqualsGreaterThanGreaterThanEqualsBetweenLikeIlike (i.e. ignorecase like)IsNotNullIsNullNotEqualNotEqualAndOr
These names can be considered keywords, and you will have problems when querying domain classes that have one of these names as a property name. For more information on
dynamic finders refer to the user guide.
