framework.retrieval.engine.index.all.database.impl.rdAbstract.DefaultRDatabaseIndexAllImpl.java Source code

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/**
 * Copyright 2010 
 *
 * 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 framework.retrieval.engine.index.all.database.impl.rdAbstract;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.util.List;
import java.util.Map;

import org.apache.commons.dbutils.DbUtils;
import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.ResultSetHandler;
import org.apache.commons.dbutils.handlers.MapListHandler;
import org.apache.commons.logging.Log;

import framework.base.snoic.base.util.ReflectUtil;
import framework.retrieval.engine.common.RetrievalUtil;
import framework.retrieval.engine.context.DefaultRetrievalProperties;
import framework.retrieval.engine.index.RetrievalIndexException;
import framework.retrieval.engine.index.all.database.DatabaseLink;

/**
 * ???
 * 
 * @author 
 *
 */
public class DefaultRDatabaseIndexAllImpl extends AbstractDefaultRDatabaseIndexAll {

    private static Log log = RetrievalUtil.getLog(DefaultRDatabaseIndexAllImpl.class);

    /**
     * ??
     * 
     * @return
     */
    private Connection getConnection() {
        Connection conn = null;
        try {
            String default_retrieval_database_choose_class = DefaultRetrievalProperties
                    .getDefault_retrieval_database_choose_class();
            String[] classAndMethod = default_retrieval_database_choose_class.split(":");
            String className = classAndMethod[0];
            String methodName = null;
            if (classAndMethod.length == 1) {
                methodName = "loadDatabaseLink";
            } else {
                methodName = classAndMethod[1];
            }
            // ??
            DatabaseLink databaseLink = (DatabaseLink) ReflectUtil.invokeMethod(className, methodName);
            DbUtils.loadDriver(databaseLink.getJdbcDriver());
            conn = DriverManager.getConnection(databaseLink.getJdbcUrl(), databaseLink.getJdbcUser(),
                    databaseLink.getJdbcPassword());
        } catch (SQLException e) {
            throw new RetrievalIndexException(e);
        }
        return conn;
    }

    /**
     * ?
     * @param conn
     */
    private void close(Connection conn) {
        DbUtils.closeQuietly(conn);
    }

    /**
     * ?SQL??
     * @param limitSql         SQL
     * @param params         SQL?
     * @return
     */
    @SuppressWarnings("unchecked")
    public List<Map> getResult(String limitSql, Object[] params) {
        Connection conn = getConnection();

        QueryRunner qRunner = new QueryRunner();
        ResultSetHandler rsh = new MapListHandler();
        List<Map> result = null;

        try {
            if (params != null && params.length > 0) {
                result = (List<Map>) qRunner.query(conn, limitSql, rsh, params);
            } else {
                result = (List<Map>) qRunner.query(conn, limitSql, rsh);
            }
        } catch (SQLException e) {
            throw new RetrievalIndexException(e);
        } finally {
            close(conn);
        }

        return result;
    }
}