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JDBC driver for MariaDB and MySQL for java 7
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/*
 *
 * MariaDB Client for Java
 *
 * Copyright (c) 2012-2014 Monty Program Ab.
 * Copyright (c) 2015-2017 MariaDB Ab.
 *
 * This library is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation; either version 2.1 of the License, or (at your option)
 * any later version.
 *
 * This library is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
 * for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License along
 * with this library; if not, write to Monty Program Ab [email protected].
 *
 * This particular MariaDB Client for Java file is work
 * derived from a Drizzle-JDBC. Drizzle-JDBC file which is covered by subject to
 * the following copyright and notice provisions:
 *
 * Copyright (c) 2009-2011, Marcus Eriksson
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 * Redistributions of source code must retain the above copyright notice, this list
 * of conditions and the following disclaimer.
 *
 * 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.
 *
 * Neither the name of the driver nor the names of its contributors may not be
 * used to endorse or promote products derived from this software without specific
 * prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS  AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS 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 COPYRIGHT HOLDER OR 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.
 *
 */

package org.mariadb.jdbc;

import org.mariadb.jdbc.internal.com.read.resultset.SelectResultSet;
import org.mariadb.jdbc.internal.com.send.parameters.ParameterHolder;
import org.mariadb.jdbc.internal.util.dao.CloneableCallableStatement;

import java.sql.ResultSet;
import java.sql.SQLException;

public class MariaDbFunctionStatement extends CallableFunctionStatement implements CloneableCallableStatement {

    private SelectResultSet outputResultSet = null;

    /**
     * Specific implementation of CallableStatement to handle function call, represent by call like
     * {?= call procedure-name[(arg1,arg2, ...)]}.
     *
     * @param connection    current connection
     * @param databaseName  database name
     * @param procedureName function name
     * @param arguments     function args
     * @throws SQLException exception
     */
    public MariaDbFunctionStatement(MariaDbConnection connection, String databaseName, String procedureName, String arguments) throws SQLException {
        super(connection, "SELECT " + procedureName + ((arguments == null) ? "()" : arguments),
                ResultSet.TYPE_FORWARD_ONLY);
        parameterMetadata = new CallableParameterMetaData(connection, databaseName, procedureName, true);
        super.initFunctionData(getParameterCount() + 1);
    }

    protected SelectResultSet getResult() throws SQLException {
        if (outputResultSet == null) {
            throw new SQLException("No output result");
        }
        return outputResultSet;
    }

    /**
     * Clone statement.
     *
     * @param connection connection
     * @return Clone statement.
     * @throws CloneNotSupportedException if any error occur.
     */
    public MariaDbFunctionStatement clone(MariaDbConnection connection) throws CloneNotSupportedException {
        MariaDbFunctionStatement clone = (MariaDbFunctionStatement) super.clone(connection);
        clone.outputResultSet = null;
        return clone;
    }

    /**
     * Executes the CALL statement.
     *
     * @return either (1) the row count for SQL Data Manipulation Language (DML) statements or (2) 0 for SQL statements
     * that return nothing
     * @throws SQLException if a database access error occurs; this method is called on a closed
     *                      PreparedStatement or the SQL statement returns a
     *                      ResultSet object
     */
    @Override
    public int executeUpdate() throws SQLException {
        connection.lock.lock();
        try {
            super.execute();
            retrieveOutputResult();
            if (results != null && results.getResultSet() == null) {
                return 0;
            }
            return getUpdateCount();
        } finally {
            connection.lock.unlock();
        }
    }


    private void retrieveOutputResult() throws SQLException {
        outputResultSet = results.getResultSet();
        if (outputResultSet != null) {
            outputResultSet.next();
        }
    }


    protected void setParameter(final int parameterIndex, final ParameterHolder holder) throws SQLException {
        super.setParameter(parameterIndex - 1, holder);
    }

    @Override
    public ResultSet executeQuery() throws SQLException {
        connection.lock.lock();
        try {
            super.execute();
            retrieveOutputResult();
            if (results != null && results.getResultSet() == null) {
                return results.getResultSet();
            }
            return SelectResultSet.createEmptyResultSet();
        } finally {
            connection.lock.unlock();
        }
    }

    @Override
    public boolean execute() throws SQLException {
        connection.lock.lock();
        try {
            super.execute();
            retrieveOutputResult();
            return results != null && results.getResultSet() == null;
        } finally {
            connection.lock.unlock();
        }
    }

}