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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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
*
* http://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.apache.openjpa.jdbc.kernel;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.Map;
import java.util.Set;
import org.apache.openjpa.jdbc.kernel.exps.ExpContext;
import org.apache.openjpa.jdbc.kernel.exps.QueryExpressionsState;
import org.apache.openjpa.jdbc.meta.ClassMapping;
import org.apache.openjpa.jdbc.sql.DBDictionary;
import org.apache.openjpa.jdbc.sql.Result;
import org.apache.openjpa.jdbc.sql.ResultSetResult;
import org.apache.openjpa.jdbc.sql.SQLBuffer;
import org.apache.openjpa.jdbc.sql.SQLExceptions;
import org.apache.openjpa.jdbc.sql.SelectImpl;
import org.apache.openjpa.kernel.ExpressionStoreQuery.AbstractExpressionExecutor;
import org.apache.openjpa.kernel.StoreQuery;
import org.apache.openjpa.kernel.exps.QueryExpressions;
import org.apache.openjpa.lib.rop.RangeResultObjectProvider;
import org.apache.openjpa.lib.rop.ResultObjectProvider;
import org.apache.openjpa.meta.ClassMetaData;
import org.apache.openjpa.util.InternalException;
/**
* A executor for Prepared SQL Query.
*
* @author Pinaki Poddar
*
*/
public class PreparedSQLStoreQuery extends SQLStoreQuery {
private static final long serialVersionUID = 1L;
private PreparedQueryImpl _cached;
public PreparedSQLStoreQuery(JDBCStore store) {
super(store);
}
@Override
public Executor newDataStoreExecutor(ClassMetaData meta,
boolean subclasses) {
return new PreparedSQLExecutor(this, meta);
}
@Override
public boolean setQuery(Object query) {
if (!(query instanceof PreparedQueryImpl)) {
throw new InternalException(query.getClass() + " not recognized");
}
_cached = (PreparedQueryImpl)query;
return true;
}
PreparedQueryImpl getPreparedQuery() {
return _cached;
}
/**
* Executor of a prepared query uses the QueryExpressions of the original query
* available via the PreparedQuery.
*
*/
public static class PreparedSQLExecutor extends AbstractExpressionExecutor {
private final ClassMetaData _meta;
private final PreparedSQLStoreQuery _query;
public PreparedSQLExecutor(PreparedSQLStoreQuery q, ClassMetaData candidate) {
_meta = candidate;
_query = q;
}
@Override
public QueryExpressions[] getQueryExpressions() {
return _query.getPreparedQuery().getQueryExpressions();
}
@Override
public Class[] getProjectionTypes(StoreQuery q) {
return _query.getPreparedQuery().getProjectionTypes();
}
@Override
public ResultObjectProvider executeQuery(StoreQuery q, Object[] params, Range range) {
PreparedSQLStoreQuery psq = (PreparedSQLStoreQuery) q;
PreparedQueryImpl pq = psq.getPreparedQuery();
JDBCStore store = psq.getStore();
DBDictionary dict = store.getDBDictionary();
SQLBuffer buf = new SQLBuffer(dict).append(pq.getTargetQuery());
Connection conn = store.getConnection();
JDBCFetchConfiguration fetch = (JDBCFetchConfiguration)q.getContext().getFetchConfiguration();
ResultObjectProvider rop;
PreparedStatement stmnt = null;
try {
stmnt = !range.lrs ? buf.prepareStatement(conn) : buf.prepareStatement(conn, fetch, -1, -1);
int index = 0;
for (Object param : params) {
dict.setUnknown(stmnt, ++index, param, null);
}
dict.setTimeouts(stmnt, fetch, false);
ResultSet rs = stmnt.executeQuery();
SelectImpl cachedSelect = pq.getSelect();
Result res = cachedSelect.getEagerResult(conn, stmnt, rs, store, fetch, false, null);
if (getQueryExpressions()[0].projections.length > 0) {
ExpContext ctx = new ExpContext(store, params, fetch);
QueryExpressionsState state = (QueryExpressionsState)getQueryExpressions()[0].state;
rop = new PreparedProjectionResultObjectProvider(cachedSelect, getQueryExpressions(),
new QueryExpressionsState[]{state}, ctx, res);
} else if (q.getContext().getCandidateType() != null) {
rop = new PreparedResultObjectProvider(cachedSelect,
(ClassMapping) _meta, store, fetch, res);
} else {
rop = new SQLProjectionResultObjectProvider(store, fetch,
(ResultSetResult)res, q.getContext().getResultType());
}
} catch (SQLException se) {
if (stmnt != null)
try { stmnt.close(); } catch (SQLException se2) {}
try { conn.close(); } catch (SQLException se2) {}
throw SQLExceptions.getStore(se, dict);
}
if (range.start != 0 || range.end != Long.MAX_VALUE)
rop = new RangeResultObjectProvider(rop, range.start,range.end);
return rop;
}
/**
* Convert given userParams to an array whose ordering matches as
* per expected during executeXXX() methods.
* The given userParams is already re-parameterized, so this method have
* to merely copy the given Map values.
*
* @see PreparedQueryImpl#reparametrize(Map, org.apache.openjpa.kernel.Broker)
*/
@Override
public synchronized Object[] toParameterArray(StoreQuery q, Map userParams) {
Object[] array = new Object[userParams.size()];
Set> userSet = userParams.entrySet();
for (Map.Entry userEntry : userSet) {
int idx = (Integer) userEntry.getKey();
array[idx] = userEntry.getValue();
}
return array;
}
}
}
