Liferay service finder methods

Liferay provides finder methods facility with help of service.

• Lets say we have employee entity and we want to create the finder method base on city.
• It allow to create finder method in it.
• In below example we create finder method which return List of Employee.

<entity name="Employee" local-service="true" remote-service="true"
cache-enabled="false">

<column name="employeeId" type="long" primary="true" />
<column name="employeeCity" type="String" />
<column name="employeeCell" type="String" />

<finder name="EmployeeCity" return-type="Collection">
<finder-column name="employeeCity" />
</finder>

</entity>

• Run service.
• Our half work is done (finder method is available in persistence class).
• EmployeeUtil in my case it is package com.sa.service.persistence inside WEB-INF.

• There are many method available now related with findByCity for example below method which returnc collection of Employee base on city.

public static java.util.List<com.sa.model.Employee> findByEmployeeCity(
java.lang.String employeeCity)
throws com.liferay.portal.kernel.exception.SystemException {
return getPersistence().findByEmployeeCity(employeeCity);
}

• The only class accessible outside the service builder is EmployeeLocalServiceUtil.
• We need to make sure the finder method is also available in this class. (to access it in our portlet class)
• This class (EmployeeLocalServiceUtil) can be used to perform CRUD operation.
• Now copy below method in the EmployeeLocalServiceImpl.
• 
  

public List<Employee> getEmployeeForEmployeeCity(String employeeCity) throws SystemException{
 

                              return this.employeePersistence.findByEmployeeCity(employeeCity);
}  

• Run again service and now check inside EmployeeLocalServiceUtil getStudentForEmployeeCity available and you can use anywhere it.