The Grails Framework 3.2.8

(Quick Reference) ## find ### Purpose Finds the first matching result for the given query or `null` if no instance is found ### Examples
    // 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" }
### 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` - A `List` of parameters for a positional parametrized HQL query `namedParams` - A `Map` of named parameters a HQL query `queryParams` - A `Map` of query parameters. Currently, only `cache` is supported `example` - An instance of the domain class for query by example | Quick Reference (hide)