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== where



=== Purpose


Defines a new `grails.gorm.DetachedCriteria` instance.


=== Examples


Basic query:

[source,groovy]
----
def query = Person.where {
   firstName == "Bart"
}
Person bart = query.find()
----

Conjunctions/Disjunctions:

[source,groovy]
----
def query = Person.where {
    (lastName != "Simpson" && firstName != "Fred") || (firstName == "Bart" && age > 9)
}
def results = query.list(sort:"firstName")
----

Property comparison:

[source,groovy]
----
def query = Person.where {
   firstName == lastName
}
----

Querying Associations:

[source,groovy]
----
def query = Pet.where {
    owner.firstName == "Joe" || owner.firstName == "Fred"
}
----

Subqueries:


[source,groovy]
----
final query = Person.where {
  age > avg(age)
}
----


=== Description


The `where` method is a powerful new type-safe querying option introduced in Grails 2.0. For more information on using the `where` method see the dedicated section on  link:{hibernate5GuideFromRef}index.html#whereQueries[Where Queries] and  link:{hibernate5GuideFromRef}index.html#detachedCriteria[Detached Criteria] in the user guide.
