org.objectstyle.cayenne.access.jdbc.ProcedureAction Maven / Gradle / Ivy

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/* ====================================================================
 * 
 * The ObjectStyle Group Software License, version 1.1
 * ObjectStyle Group - http://objectstyle.org/
 * 
 * Copyright (c) 2002-2005, Andrei (Andrus) Adamchik and individual authors
 * of the software. All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 
 * 3. The end-user documentation included with the redistribution, if any,
 *    must include the following acknowlegement:
 *    "This product includes software developed by independent contributors
 *    and hosted on ObjectStyle Group web site (http://objectstyle.org/)."
 *    Alternately, this acknowlegement may appear in the software itself,
 *    if and wherever such third-party acknowlegements normally appear.
 * 
 * 4. The names "ObjectStyle Group" and "Cayenne" must not be used to endorse
 *    or promote products derived from this software without prior written
 *    permission. For written permission, email
 *    "andrus at objectstyle dot org".
 * 
 * 5. Products derived from this software may not be called "ObjectStyle"
 *    or "Cayenne", nor may "ObjectStyle" or "Cayenne" appear in their
 *    names without prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE OBJECTSTYLE GROUP OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 * 
 * This software consists of voluntary contributions made by many
 * individuals and hosted on ObjectStyle Group web site.  For more
 * information on the ObjectStyle Group, please see
 * .
 */
package org.objectstyle.cayenne.access.jdbc;

import java.sql.CallableStatement;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.objectstyle.cayenne.CayenneRuntimeException;
import org.objectstyle.cayenne.access.OperationObserver;
import org.objectstyle.cayenne.access.QueryLogger;
import org.objectstyle.cayenne.access.trans.ProcedureTranslator;
import org.objectstyle.cayenne.access.types.ExtendedType;
import org.objectstyle.cayenne.dba.DbAdapter;
import org.objectstyle.cayenne.map.EntityResolver;
import org.objectstyle.cayenne.map.Procedure;
import org.objectstyle.cayenne.map.ProcedureParameter;
import org.objectstyle.cayenne.query.ProcedureQuery;

/**
 * A SQLAction that runs a stored procedure. Note that ProcedureAction has internal state
 * and is not thread-safe.
 * 
 * @since 1.2
 * @author Andrus Adamchik
 */
public class ProcedureAction extends BaseSQLAction {

    protected ProcedureQuery query;

    /**
     * Holds a number of ResultSets processed by the action. This value is reset to zero
     * on every "performAction" call.
     */
    protected int processedResultSets;

    public ProcedureAction(ProcedureQuery query, DbAdapter adapter,
            EntityResolver entityResolver) {
        super(adapter, entityResolver);
        this.query = query;
    }

    public void performAction(Connection connection, OperationObserver observer)
            throws SQLException, Exception {

        processedResultSets = 0;

        ProcedureTranslator transl = createTranslator(connection);

        CallableStatement statement = (CallableStatement) transl.createStatement();

        try {
            // stored procedure may contain a mixture of update counts and result sets,
            // and out parameters. Read out parameters first, then
            // iterate until we exhaust all results
            statement.execute();

            // read out parameters
            readProcedureOutParameters(statement, observer);

            // read the rest of the query
            while (true) {
                if (statement.getMoreResults()) {
                    ResultSet rs = statement.getResultSet();

                    try {
                        RowDescriptor descriptor = describeResultSet(
                                rs,
                                processedResultSets++);
                        readResultSet(rs, descriptor, query, observer);
                    }
                    finally {
                        try {
                            rs.close();
                        }
                        catch (SQLException ex) {
                        }
                    }
                }
                else {
                    int updateCount = statement.getUpdateCount();
                    if (updateCount == -1) {
                        break;
                    }
                    QueryLogger.logUpdateCount(updateCount);
                    observer.nextCount(query, updateCount);
                }
            }
        }
        finally {
            try {
                statement.close();
            }
            catch (SQLException ex) {

            }
        }
    }

    /**
     * Returns the ProcedureTranslator to use for this ProcedureAction.
     * 
     * @param connection JDBC connection
     */
    protected ProcedureTranslator createTranslator(Connection connection) {
        ProcedureTranslator translator = new ProcedureTranslator();
        translator.setAdapter(getAdapter());
        translator.setQuery(query);
        translator.setEntityResolver(getEntityResolver());
        translator.setConnection(connection);
        return translator;
    }

    /**
     * Creates a RowDescriptor for result set.
     * 
     * @param resultSet JDBC ResultSet
     * @param setIndex a zero-based index of the ResultSet in the query results.
     */
    protected RowDescriptor describeResultSet(ResultSet resultSet, int setIndex) {
        if (setIndex < 0) {
            throw new IllegalArgumentException(
                    "Expected a non-negative result set index. Got: " + setIndex);
        }

        List descriptors = query.getResultDescriptors();

        if (descriptors.isEmpty()) {
            // failover to default JDBC result descriptor
            return new RowDescriptor(resultSet, getAdapter().getExtendedTypes());
        }

        // if one result is described, all of them must be present...
        if (setIndex >= descriptors.size() || descriptors.get(setIndex) == null) {
            throw new CayenneRuntimeException("No descriptor for result set at index '"
                    + setIndex
                    + "' configured.");
        }

        ColumnDescriptor[] columns = (ColumnDescriptor[]) descriptors.get(setIndex);
        return new RowDescriptor(columns, getAdapter().getExtendedTypes());
    }

    /**
     * Returns stored procedure for an internal query.
     */
    protected Procedure getProcedure() {
        return getEntityResolver().lookupProcedure(query);
    }

    /**
     * Helper method that reads OUT parameters of a CallableStatement.
     */
    protected void readProcedureOutParameters(
            CallableStatement statement,
            OperationObserver delegate) throws SQLException, Exception {

        long t1 = System.currentTimeMillis();

        // build result row...
        Map result = null;
        List parameters = getProcedure().getCallParameters();
        for (int i = 0; i < parameters.size(); i++) {
            ProcedureParameter parameter = (ProcedureParameter) parameters.get(i);

            if (!parameter.isOutParam()) {
                continue;
            }

            if (result == null) {
                result = new HashMap();
            }

            ColumnDescriptor descriptor = new ColumnDescriptor(parameter);
            ExtendedType type = getAdapter().getExtendedTypes().getRegisteredType(
                    descriptor.getJavaClass());
            Object val = type.materializeObject(statement, i + 1, descriptor
                    .getJdbcType());

            result.put(descriptor.getLabel(), val);
        }

        if (result != null && !result.isEmpty()) {
            // treat out parameters as a separate data row set
            QueryLogger.logSelectCount(1, System.currentTimeMillis() - t1);
            delegate.nextDataRows(query, Collections.singletonList(result));
        }
    }
}