it.openutils.migration.generic.JdbcIfTableExistsConditionalTask Maven / Gradle / Ivy

/**
 *
 * openutils db migration (http://www.openmindlab.com/lab/products/dbmigration.html)
 * Copyright(C) 2007-2010, Openmind S.r.l. http://www.openmindonline.it
 *
 *  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
 *
 *       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 it.openutils.migration.generic;

import it.openutils.migration.task.setup.BaseConditionalTask;

import java.sql.Connection;
import java.sql.DatabaseMetaData;
import java.sql.ResultSet;
import java.sql.SQLException;

import org.apache.commons.lang.StringUtils;
import org.springframework.dao.DataAccessException;
import org.springframework.jdbc.core.ConnectionCallback;
import org.springframework.jdbc.core.simple.SimpleJdbcTemplate;


/**
 * Task that executes if a given table exists.
 * @author fgiust
 * @version $Id: JdbcIfTableExistsConditionalTask.java 2234 2010-03-31 20:21:08Z fgiust $
 */
public class JdbcIfTableExistsConditionalTask extends BaseConditionalTask
{

    /**
     * Table name.
     */
    protected String table;

    /**
     * Catalog.
     */
    protected String catalog;

    /**
     * Schema.
     */
    protected String schema;

    /**
     * Sets the catalog.
     * @param catalog the catalog to set
     */
    public void setCatalog(String catalog)
    {
        this.catalog = catalog;
    }

    /**
     * Sets the schema.
     * @param schema the schema to set
     */
    public void setSchema(String schema)
    {
        this.schema = schema;
    }


    /**
     * Sets the table.
     * @param table the table to set
     */
    public void setTable(String table)
    {
        this.table = table;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public boolean check(SimpleJdbcTemplate jdbcTemplate)
    {

        final String tableName = StringUtils.trim(table);

        return (Boolean) jdbcTemplate.getJdbcOperations().execute(new ConnectionCallback()
        {

            public Object doInConnection(Connection con) throws SQLException, DataAccessException
            {

                DatabaseMetaData dbMetadata = con.getMetaData();
                ResultSet rs = dbMetadata.getTables(catalog, schema, tableName, null);
                boolean tableExists = rs.next();
                rs.close();

                return tableExists;
            }
        });
    }

}