add city service

spring-boot-jpa-querydsl/src/main/java/com/lance/querydsl/service/CityService.java

@@ -0,0 +1,24 @@
+package com.lance.querydsl.service;
+
+import java.util.List;
+
+import com.lance.querydsl.entity.CityEntity;
+
+public interface CityService {
+
+	/**
+	 * findAll
+	 * @return
+	 */
+	List<CityEntity> findAll(String hotelName);
+
+	/**
+	 * Save
+	 * @param city
+	 */
+	void save(CityEntity city);
+
+	void delete(long id);
+
+	void delete(CityEntity city);
+}

spring-boot-jpa-querydsl/src/main/java/com/lance/querydsl/service/CityServiceImpl.java

@@ -0,0 +1,59 @@
+package com.lance.querydsl.service;
+
+import java.util.List;
+
+import javax.persistence.EntityManager;
+import javax.persistence.PersistenceContext;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+import org.springframework.util.StringUtils;
+
+import com.lance.querydsl.entity.CityEntity;
+import com.lance.querydsl.entity.QCityEntity;
+import com.lance.querydsl.repository.CityRepository;
+import com.querydsl.core.types.dsl.BooleanExpression;
+import com.querydsl.jpa.impl.JPAQuery;
+
+@Service
+public class CityServiceImpl implements CityService {
+	@PersistenceContext
+    private EntityManager em;
+	@Autowired
+	private CityRepository cityRepository;
+
+	/**
+	 * findAll
+	 * @return
+	 */
+	public List<CityEntity> findAll(String hotelName) {
+		QCityEntity cityEntity = QCityEntity.cityEntity;
+		JPAQuery<CityEntity>query = new JPAQuery<>(em);
+		BooleanExpression express = cityEntity.state.eq("1");
+
+		if(StringUtils.hasText(hotelName)) {
+			express = express.and(cityEntity.hotels.any().name.likeIgnoreCase('%'+hotelName+'%'));
+		}
+		return query.select(cityEntity).from(cityEntity).where(express).fetch();
+	}
+
+	/**
+	 * Save
+	 * @param city
+	 */
+	@Transactional	
+	public void save(CityEntity city) {
+		cityRepository.save(city);
+	}
+
+	@Transactional
+	public void delete(long id) {
+		cityRepository.delete(id);
+	}
+
+	@Transactional
+	public void delete(CityEntity city) {
+		cityRepository.delete(city);
+	}
+}