java NamedQuery（通常在域对象中定义）

Posted 2021-05-08

package com.pluralsight.repository;

import java.util.List;

import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.Query;
import javax.persistence.TypedQuery;

import org.springframework.stereotype.Repository;

import com.pluralsight.model.Goal;
import com.pluralsight.model.GoalReport;

@Repository("goalRepository")
public class GoalRepositoryImpl implements GoalRepository {

	@PersistenceContext
	private EntityManager em;

	public Goal save(Goal goal) {
		em.persist(goal);

		// has to call flush to save into database
		em.flush();
		return goal;
	}

	public List<Goal> loadAll() {
//		Query query = em.createQuery("Select g from Goal g");
		TypedQuery<Goal> query = em.createNamedQuery(Goal.FIND_ALL_GOALS,Goal.class);

		List goals = query.getResultList();

		return goals;
	}

	public List<GoalReport> findAllGoalReports() {
//		Query query = em.createQuery("Select new com.pluralsight.model.GoalReport(g.minutes, e.minutes, e.activity)"
//				+ "from Goal g, Exercise e where g.id = e.goal.id");
		
		TypedQuery<GoalReport> query = em.createNamedQuery(Goal.FIND_GOAL_REPORTS, GoalReport.class);
				
		return query.getResultList();
	}

}

package com.pluralsight.model;

import java.util.ArrayList;
import java.util.List;

import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.NamedQueries;
import javax.persistence.NamedQuery;
import javax.persistence.OneToMany;
import javax.persistence.Table;

import org.hibernate.validator.constraints.Range;

@Entity
@Table(name="goals")
@NamedQueries({
	@NamedQuery(name=Goal.FIND_GOAL_REPORTS, query="Select new com.pluralsight.model.GoalReport(g.minutes, e.minutes, e.activity)"
			+ "from Goal g, Exercise e where g.id = e.goal.id"),
	@NamedQuery(name=Goal.FIND_ALL_GOALS, query="Select g from Goal g")
})
public class Goal {
	
	public static final String FIND_GOAL_REPORTS = "findGoalReports";
	public static final String FIND_ALL_GOALS = "findAllGoals";
	
	@Id
	@GeneratedValue
	@Column(name="GOAL_ID")
	private Long id;

	@Range(min = 1, max = 120)
	@Column(name="MINUTES")
	private int minutes;
	
	@OneToMany(mappedBy="goal", cascade=CascadeType.ALL, fetch=FetchType.LAZY)
	private List<Exercise> exercises = new ArrayList<Exercise>();

	public List<Exercise> getExercises() {
		return exercises;
	}

	public void setExercises(List<Exercise> exercises) {
		this.exercises = exercises;
	}

	public Long getId() {
		return id;
	}

	public int getMinutes() {
		return minutes;
	}

	public void setId(Long id) {
		this.id = id;
	}

	public void setMinutes(int minutes) {
		this.minutes = minutes;
	}

}