spring-batch JpaNamedQueryProvider 源码
spring-batch JpaNamedQueryProvider 代码
文件路径：/spring-batch-infrastructure/src/main/java/org/springframework/batch/item/database/orm/JpaNamedQueryProvider.java
/*
* Copyright 2020-2021 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.batch.item.database.orm;
import jakarta.persistence.Query;
import org.springframework.util.Assert;
import org.springframework.util.StringUtils;
/**
* <p>
* This query provider creates JPA named {@link Query}s.
* </p>
*
* @author Mahmoud Ben Hassine
* @author Parikshit Dutta
* @since 4.3
* @param <E> entity returned by executing the query
*/
public class JpaNamedQueryProvider<E> extends AbstractJpaQueryProvider {
private Class<E> entityClass;
private String namedQuery;
@Override
public Query createQuery() {
return getEntityManager().createNamedQuery(this.namedQuery, this.entityClass);
}
/**
* @param namedQuery name of a jpa named query
*/
public void setNamedQuery(String namedQuery) {
this.namedQuery = namedQuery;
}
/**
* @param entityClazz name of a jpa entity class
*/
public void setEntityClass(Class<E> entityClazz) {
this.entityClass = entityClazz;
}
@Override
public void afterPropertiesSet() throws Exception {
Assert.isTrue(StringUtils.hasText(this.namedQuery), "Named query cannot be empty");
Assert.notNull(this.entityClass, "Entity class cannot be NULL");
}
}
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