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SingleIdLoadPlan.java
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SingleIdLoadPlan.java
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/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* License: GNU Lesser General Public License (LGPL), version 2.1 or later
* See the lgpl.txt file in the root directory or http://www.gnu.org/licenses/lgpl-2.1.html
*/
package org.hibernate.loader.ast.internal;
import java.util.Iterator;
import java.util.List;
import org.hibernate.LockOptions;
import org.hibernate.engine.jdbc.env.spi.JdbcEnvironment;
import org.hibernate.engine.jdbc.spi.JdbcServices;
import org.hibernate.engine.spi.SessionFactoryImplementor;
import org.hibernate.engine.spi.SharedSessionContractImplementor;
import org.hibernate.loader.ast.spi.Loadable;
import org.hibernate.metamodel.mapping.JdbcMapping;
import org.hibernate.metamodel.mapping.ModelPart;
import org.hibernate.query.spi.QueryOptions;
import org.hibernate.query.spi.QueryParameterBindings;
import org.hibernate.sql.ast.Clause;
import org.hibernate.sql.ast.SqlAstTranslatorFactory;
import org.hibernate.sql.ast.tree.expression.JdbcParameter;
import org.hibernate.sql.ast.tree.select.SelectStatement;
import org.hibernate.sql.exec.internal.JdbcParameterBindingsImpl;
import org.hibernate.sql.exec.internal.JdbcSelectExecutorStandardImpl;
import org.hibernate.sql.exec.spi.Callback;
import org.hibernate.sql.exec.spi.ExecutionContext;
import org.hibernate.sql.exec.spi.JdbcParameterBinding;
import org.hibernate.sql.exec.spi.JdbcParameterBindings;
import org.hibernate.sql.exec.spi.JdbcSelect;
import org.hibernate.sql.results.internal.RowTransformerPassThruImpl;
/**
* todo (6.0) : this can generically define a load-by-uk as well. only the SQL AST and `restrictivePart` vary and they are passed as ctor args
*
* Describes a plan for loading an entity by identifier.
*
* @implNote Made up of (1) a SQL AST for the SQL SELECT and (2) the `ModelPart` used as the restriction
*
* @author Steve Ebersole
*/
public class SingleIdLoadPlan<T> implements SingleEntityLoadPlan {
private final ModelPart restrictivePart;
private final SelectStatement sqlAst;
private final List<JdbcParameter> jdbcParameters;
public SingleIdLoadPlan(
ModelPart restrictivePart,
SelectStatement sqlAst,
List<JdbcParameter> jdbcParameters) {
this.restrictivePart = restrictivePart;
this.sqlAst = sqlAst;
this.jdbcParameters = jdbcParameters;
}
@Override
public Loadable getLoadable() {
return null;
}
@Override
public ModelPart getRestrictivePart() {
return restrictivePart;
}
@Override
public SelectStatement getSqlAst() {
return sqlAst;
}
T load(
Object restrictedValue,
LockOptions lockOptions,
SharedSessionContractImplementor session) {
return load( restrictedValue, lockOptions, null, session );
}
T load(
Object restrictedValue,
LockOptions lockOptions,
Object entityInstance,
SharedSessionContractImplementor session) {
final SessionFactoryImplementor sessionFactory = session.getFactory();
final JdbcServices jdbcServices = sessionFactory.getJdbcServices();
final JdbcEnvironment jdbcEnvironment = jdbcServices.getJdbcEnvironment();
final SqlAstTranslatorFactory sqlAstTranslatorFactory = jdbcEnvironment.getSqlAstTranslatorFactory();
final JdbcSelect jdbcSelect = sqlAstTranslatorFactory.buildSelectTranslator( sessionFactory ).translate( sqlAst );
final int jdbcTypeCount = restrictivePart.getJdbcTypeCount( sessionFactory.getTypeConfiguration() );
assert jdbcParameters.size() % jdbcTypeCount == 0;
final JdbcParameterBindings jdbcParameterBindings = new JdbcParameterBindingsImpl( jdbcTypeCount );
final Iterator<JdbcParameter> paramItr = jdbcParameters.iterator();
while ( paramItr.hasNext() ) {
restrictivePart.visitJdbcValues(
restrictedValue,
Clause.WHERE,
(value, type) -> {
assert paramItr.hasNext();
final JdbcParameter parameter = paramItr.next();
jdbcParameterBindings.addBinding(
parameter,
new JdbcParameterBinding() {
@Override
public JdbcMapping getBindType() {
return type;
}
@Override
public Object getBindValue() {
return value;
}
}
);
},
session
);
}
sqlAst.getQuerySpec().bindFilterPredicateParameters( jdbcParameterBindings );
final List list = JdbcSelectExecutorStandardImpl.INSTANCE.list(
jdbcSelect,
jdbcParameterBindings,
new ExecutionContext() {
@Override
public SharedSessionContractImplementor getSession() {
return session;
}
@Override
public Object getEntityInstance() {
return entityInstance;
}
@Override
public Object getEntityId() {
return restrictedValue;
}
@Override
public QueryOptions getQueryOptions() {
return QueryOptions.NONE;
}
@Override
public QueryParameterBindings getQueryParameterBindings() {
return QueryParameterBindings.NO_PARAM_BINDINGS;
}
@Override
public Callback getCallback() {
return afterLoadAction -> {
};
}
},
RowTransformerPassThruImpl.instance(),
true
);
if ( list.isEmpty() ) {
return null;
}
//noinspection unchecked
return (T) list.get( 0 );
}
}