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DATAJDBC-551 - Supports derived delete.
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.../src/main/java/org/springframework/data/jdbc/repository/query/JdbcDeleteQueryCreator.java
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/* | ||
* Copyright 2020 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.data.jdbc.repository.query; | ||
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import java.util.ArrayList; | ||
import java.util.List; | ||
import java.util.stream.Stream; | ||
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import org.springframework.data.domain.Sort; | ||
import org.springframework.data.jdbc.core.convert.JdbcConverter; | ||
import org.springframework.data.mapping.PersistentPropertyPath; | ||
import org.springframework.data.relational.core.dialect.Dialect; | ||
import org.springframework.data.relational.core.dialect.RenderContextFactory; | ||
import org.springframework.data.relational.core.mapping.PersistentPropertyPathExtension; | ||
import org.springframework.data.relational.core.mapping.RelationalMappingContext; | ||
import org.springframework.data.relational.core.mapping.RelationalPersistentEntity; | ||
import org.springframework.data.relational.core.mapping.RelationalPersistentProperty; | ||
import org.springframework.data.relational.core.query.Criteria; | ||
import org.springframework.data.relational.core.sql.Condition; | ||
import org.springframework.data.relational.core.sql.Conditions; | ||
import org.springframework.data.relational.core.sql.Delete; | ||
import org.springframework.data.relational.core.sql.DeleteBuilder.DeleteWhere; | ||
import org.springframework.data.relational.core.sql.Select; | ||
import org.springframework.data.relational.core.sql.SelectBuilder.SelectWhere; | ||
import org.springframework.data.relational.core.sql.StatementBuilder; | ||
import org.springframework.data.relational.core.sql.Table; | ||
import org.springframework.data.relational.core.sql.render.SqlRenderer; | ||
import org.springframework.data.relational.repository.query.RelationalEntityMetadata; | ||
import org.springframework.data.relational.repository.query.RelationalParameterAccessor; | ||
import org.springframework.data.relational.repository.query.RelationalQueryCreator; | ||
import org.springframework.data.repository.query.parser.PartTree; | ||
import org.springframework.jdbc.core.namedparam.MapSqlParameterSource; | ||
import org.springframework.lang.Nullable; | ||
import org.springframework.util.Assert; | ||
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/** | ||
* Implementation of {@link RelationalQueryCreator} that creates {@link Stream} of deletion {@link ParametrizedQuery} | ||
* from a {@link PartTree}. | ||
* | ||
* @author Yunyoung LEE | ||
* @since 2.1 | ||
*/ | ||
class JdbcDeleteQueryCreator extends RelationalQueryCreator<Stream<ParametrizedQuery>> { | ||
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private final RelationalMappingContext context; | ||
private final QueryMapper queryMapper; | ||
private final RelationalEntityMetadata<?> entityMetadata; | ||
private final RenderContextFactory renderContextFactory; | ||
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/** | ||
* Creates new instance of this class with the given {@link PartTree}, {@link JdbcConverter}, {@link Dialect}, | ||
* {@link RelationalEntityMetadata} and {@link RelationalParameterAccessor}. | ||
* | ||
* @param context | ||
* @param tree part tree, must not be {@literal null}. | ||
* @param converter must not be {@literal null}. | ||
* @param dialect must not be {@literal null}. | ||
* @param entityMetadata relational entity metadata, must not be {@literal null}. | ||
* @param accessor parameter metadata provider, must not be {@literal null}. | ||
*/ | ||
JdbcDeleteQueryCreator(RelationalMappingContext context, PartTree tree, JdbcConverter converter, Dialect dialect, | ||
RelationalEntityMetadata<?> entityMetadata, RelationalParameterAccessor accessor) { | ||
super(tree, accessor); | ||
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Assert.notNull(converter, "JdbcConverter must not be null"); | ||
Assert.notNull(dialect, "Dialect must not be null"); | ||
Assert.notNull(entityMetadata, "Relational entity metadata must not be null"); | ||
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this.context = context; | ||
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this.entityMetadata = entityMetadata; | ||
this.queryMapper = new QueryMapper(dialect, converter); | ||
this.renderContextFactory = new RenderContextFactory(dialect); | ||
} | ||
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@Override | ||
protected Stream<ParametrizedQuery> complete(@Nullable Criteria criteria, Sort sort) { | ||
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RelationalPersistentEntity<?> entity = entityMetadata.getTableEntity(); | ||
Table table = Table.create(entityMetadata.getTableName()); | ||
MapSqlParameterSource parameterSource = new MapSqlParameterSource(); | ||
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SqlContext sqlContext = new SqlContext(entity); | ||
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Condition condition = criteria == null ? null | ||
: queryMapper.getMappedObject(parameterSource, criteria, table, entity); | ||
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// create select criteria query for subselect | ||
SelectWhere selectBuilder = StatementBuilder.select(sqlContext.getIdColumn()).from(table); | ||
Select select = condition == null ? selectBuilder.build() : selectBuilder.where(condition).build(); | ||
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// create delete relation queries | ||
List<Delete> deleteChain = new ArrayList<>(); | ||
deleteRelations(deleteChain, entity, select); | ||
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// crate delete query | ||
DeleteWhere deleteBuilder = StatementBuilder.delete(table); | ||
Delete delete = condition == null ? deleteBuilder.build() : deleteBuilder.where(condition).build(); | ||
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deleteChain.add(delete); | ||
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SqlRenderer renderer = SqlRenderer.create(renderContextFactory.createRenderContext()); | ||
return deleteChain.stream().map(d -> new ParametrizedQuery(renderer.render(d), parameterSource)); | ||
} | ||
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private void deleteRelations(List<Delete> deleteChain, RelationalPersistentEntity<?> entity, Select parentSelect) { | ||
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for (PersistentPropertyPath<RelationalPersistentProperty> path : context | ||
.findPersistentPropertyPaths(entity.getType(), p -> true)) { | ||
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PersistentPropertyPathExtension extPath = new PersistentPropertyPathExtension(context, path); | ||
if (extPath.isEntity() && !extPath.isEmbedded()) { | ||
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SqlContext sqlContext = new SqlContext(extPath.getLeafEntity()); | ||
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Condition inCondition = Conditions.in(sqlContext.getTable().column(extPath.getReverseColumnName()), | ||
parentSelect); | ||
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Select select = StatementBuilder.select(sqlContext.getIdColumn()).from(sqlContext.getTable()).where(inCondition) | ||
.build(); | ||
deleteRelations(deleteChain, extPath.getLeafEntity(), select); | ||
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deleteChain.add(StatementBuilder.delete(sqlContext.getTable()).where(inCondition).build()); | ||
} | ||
} | ||
} | ||
} |
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