// Dan brown's first book
Book.find("from Book as b where b.author='Dan Brown'")
// with a positional parameter
Book.find("from Book as b where b.author=?", ['Dan Brown'])
// with a named parameter
Book.find("from Book as b where b.author=:author", [author: 'Dan Brown'])
// use the query cache
Book.find("from Book as b where b.author='Dan Brown'", [cache: true])
Book.find("from Book as b where b.author=:author",
[author: 'Dan Brown'],
[cache: true])
// query by example
def example = new Book(author: "Dan Brown")
Book.find(example)
// Using where criteria (since Grails 2.0)
Person p = Person.find { firstName == "Bart" }find
Purpose
Finds the first matching result for the given query or null if no instance is found
Examples
Description
The find method allows querying with Hibernate’s query language HQL and querying by example. The basic syntax is:
Book.find(String query)
Book.find(String query, Collection positionalParams)
Book.find(String query, Collection positionalParams, Map queryParams)
Book.find(String query, Map namedParams)
Book.find(String query, Map namedParams, Map queryParams)
Book.find(Book example)
Book.find(Closure whereCriteria)Parameters:
-
query- An HQL query -
positionalParams- AListof parameters for a positional parametrized HQL query -
namedParams- AMapof named parameters a HQL query -
queryParams- AMapof query parameters. Currently, onlycacheis supported -
example- An instance of the domain class for query by example