spring HibernateDefaultDdlAutoProvider 源码
springboot HibernateDefaultDdlAutoProvider 代码
文件路径：/spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/orm/jpa/HibernateDefaultDdlAutoProvider.java
/*
* Copyright 2012-2019 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.boot.autoconfigure.orm.jpa;
import java.util.stream.StreamSupport;
import javax.sql.DataSource;
import org.springframework.boot.jdbc.EmbeddedDatabaseConnection;
import org.springframework.boot.jdbc.SchemaManagement;
import org.springframework.boot.jdbc.SchemaManagementProvider;
/**
* A {@link SchemaManagementProvider} that invokes a configurable number of
* {@link SchemaManagementProvider} instances for embedded data sources only.
*
* @author Stephane Nicoll
*/
class HibernateDefaultDdlAutoProvider implements SchemaManagementProvider {
private final Iterable<SchemaManagementProvider> providers;
HibernateDefaultDdlAutoProvider(Iterable<SchemaManagementProvider> providers) {
this.providers = providers;
}
String getDefaultDdlAuto(DataSource dataSource) {
if (!EmbeddedDatabaseConnection.isEmbedded(dataSource)) {
return "none";
}
SchemaManagement schemaManagement = getSchemaManagement(dataSource);
if (SchemaManagement.MANAGED.equals(schemaManagement)) {
return "none";
}
return "create-drop";
}
@Override
public SchemaManagement getSchemaManagement(DataSource dataSource) {
return StreamSupport.stream(this.providers.spliterator(), false)
.map((provider) -> provider.getSchemaManagement(dataSource)).filter(SchemaManagement.MANAGED::equals)
.findFirst().orElse(SchemaManagement.UNMANAGED);
}
}
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