Package com.axelor.db

Class Query.JoinHelper

java.lang.Object

com.axelor.db.Query.JoinHelper

Enclosing class:

Query<T extends Model>

protected static class Query.JoinHelper
extends Object

JoinHelper class is used to auto generate LEFT JOIN for association expressions.

For example:

    Query<Contact> q = Contact.all().filter("self.title.code = ?1 OR self.age > ?2", "mr", 20);
 

Results in:

 SELECT self FROM Contact self LEFT JOIN self.title _title WHERE _title.code = ?1 OR self.age > ?2
 

So that all the records are matched even if title field is null.

Constructor Summary

Constructors

Constructor	Description
JoinHelper(Class<?> beanClass)

Method Summary

Modifier and Type	Method	Description
String	fixSelect(String query)
String	joinName(String name)
String	parse(String filter, boolean translate)	Parse the given filter string and return transformed filter expression.
String	toString()
String	toString(boolean fetch)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Details

JoinHelper

public JoinHelper(Class<?> beanClass)

Method Details

parse

public String parse(String filter,
 boolean translate)

Parse the given filter string and return transformed filter expression.

Automatically calculate LEFT JOIN for association path expressions and the path expressions are replaced with the join variables.

Parameters:

filter - the filter expression

translate - whether to generate translation join

Returns:

the transformed filter expression

joinName

public String joinName(String name)

fixSelect

public String fixSelect(String query)

toString

public String toString()

Overrides:

toString in class Object

toString

public String toString(boolean fetch)