spring-batch JpaNativeQueryProvider 源码
spring-batch JpaNativeQueryProvider 代码
文件路径：/spring-batch-infrastructure/src/main/java/org/springframework/batch/item/database/orm/JpaNativeQueryProvider.java
/*
* Copyright 2006-2021 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 {@link Query}s from injected native SQL queries. This
* is useful if there is a need to utilize database-specific features such as query hints,
* the CONNECT keyword in Oracle, etc.
* </p>
*
* @author Anatoly Polinsky
* @author Mahmoud Ben Hassine
* @param <E> entity returned by executing the query
*/
public class JpaNativeQueryProvider<E> extends AbstractJpaQueryProvider {
private Class<E> entityClass;
private String sqlQuery;
@Override
public Query createQuery() {
return getEntityManager().createNativeQuery(sqlQuery, entityClass);
}
public void setSqlQuery(String sqlQuery) {
this.sqlQuery = sqlQuery;
}
public void setEntityClass(Class<E> entityClazz) {
this.entityClass = entityClazz;
}
@Override
public void afterPropertiesSet() throws Exception {
Assert.isTrue(StringUtils.hasText(sqlQuery), "Native SQL query cannot be empty");
Assert.notNull(entityClass, "Entity class cannot be NULL");
}
}
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