| /* |
| * 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.hadoop.chukwa.util; |
| |
| import java.sql.SQLException; |
| import java.sql.Connection; |
| import java.sql.Statement; |
| import java.sql.PreparedStatement; |
| import java.sql.ResultSet; |
| import java.util.List; |
| import java.text.SimpleDateFormat; |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| |
| public class DatabaseWriter { |
| private static Log log = LogFactory.getLog(DatabaseWriter.class); |
| private Connection conn = null; |
| private Statement stmt = null; |
| private PreparedStatement pstmt = null; |
| private ResultSet rs = null; |
| |
| public DatabaseWriter(String host, String user, String password) { |
| String jdbc_url = "jdbc:mysql://" + host + "/"; |
| if (user != null) { |
| jdbc_url = jdbc_url + "?user=" + user; |
| if (password != null) { |
| jdbc_url = jdbc_url + "&password=" + password; |
| } |
| } |
| try { |
| // The newInstance() call is a work around for some |
| // broken Java implementations |
| DriverManagerUtil.loadDriver().newInstance(); |
| } catch (Exception ex) { |
| // handle the error |
| log.error(ex, ex); |
| } |
| try { |
| conn = org.apache.hadoop.chukwa.util.DriverManagerUtil.getConnection(jdbc_url); |
| log.debug("Initialized JDBC URL: " + jdbc_url); |
| } catch (SQLException ex) { |
| log.error(ex, ex); |
| } |
| } |
| |
| public DatabaseWriter(String cluster) { |
| ClusterConfig cc = new ClusterConfig(); |
| String jdbc_url = cc.getURL(cluster); |
| try { |
| // The newInstance() call is a work around for some |
| // broken Java implementations |
| DriverManagerUtil.loadDriver().newInstance(); |
| } catch (Exception ex) { |
| // handle the error |
| log.error(ex, ex); |
| } |
| try { |
| conn = org.apache.hadoop.chukwa.util.DriverManagerUtil.getConnection(jdbc_url); |
| log.debug("Initialized JDBC URL: " + jdbc_url); |
| } catch (SQLException ex) { |
| log.error(ex, ex); |
| } |
| } |
| |
| public void execute(String query) throws SQLException { |
| try { |
| stmt = conn.createStatement(); |
| stmt.execute(query); |
| } catch (SQLException ex) { |
| // handle any errors |
| log.error(ex, ex); |
| log.error("SQL Statement:" + query); |
| log.error("SQLException: " + ex.getMessage()); |
| log.error("SQLState: " + ex.getSQLState()); |
| log.error("VendorError: " + ex.getErrorCode()); |
| throw ex; |
| } finally { |
| if (stmt != null) { |
| try { |
| stmt.close(); |
| } catch (SQLException sqlEx) { |
| // ignore |
| log.debug(ExceptionUtil.getStackTrace(sqlEx)); |
| } |
| stmt = null; |
| } |
| } |
| } |
| |
| public Connection getConnection() { |
| return conn; |
| } |
| |
| public ResultSet query(String query, List<Object> parameters) throws SQLException { |
| try { |
| pstmt = conn.prepareStatement(query); |
| for(int i=0;i<parameters.size();i++) { |
| int index = i+1; |
| pstmt.setObject(index,parameters.get(i)); |
| } |
| rs = pstmt.executeQuery(); |
| } catch (SQLException ex) { |
| // handle any errors |
| //only log at debug level because caller will still see exception |
| log.debug(ex, ex); |
| log.debug("SQL Statement:" + query); |
| log.debug("SQLException: " + ex.getMessage()); |
| log.debug("SQLState: " + ex.getSQLState()); |
| log.debug("VendorError: " + ex.getErrorCode()); |
| throw ex; |
| } |
| return rs; |
| } |
| |
| public ResultSet query(String query) throws SQLException { |
| try { |
| stmt = conn.createStatement(); |
| rs = stmt.executeQuery(query); |
| } catch (SQLException ex) { |
| // handle any errors |
| //only log at debug level because caller will still see exception |
| log.debug(ex, ex); |
| log.debug("SQL Statement:" + query); |
| log.debug("SQLException: " + ex.getMessage()); |
| log.debug("SQLState: " + ex.getSQLState()); |
| log.debug("VendorError: " + ex.getErrorCode()); |
| throw ex; |
| } |
| return rs; |
| } |
| |
| public void close() { |
| // it is a good idea to release |
| // resources in a finally{} block |
| // in reverse-order of their creation |
| // if they are no-longer needed |
| if (rs != null) { |
| try { |
| rs.close(); |
| } catch (SQLException sqlEx) { |
| // ignore |
| log.debug(ExceptionUtil.getStackTrace(sqlEx)); |
| } |
| rs = null; |
| } |
| if (stmt != null) { |
| try { |
| stmt.close(); |
| } catch (SQLException sqlEx) { |
| // ignore |
| log.debug(ExceptionUtil.getStackTrace(sqlEx)); |
| } |
| stmt = null; |
| } |
| if (conn != null) { |
| try { |
| conn.close(); |
| } catch (SQLException sqlEx) { |
| // ignore |
| log.debug(ExceptionUtil.getStackTrace(sqlEx)); |
| } |
| conn = null; |
| } |
| } |
| |
| public static String formatTimeStamp(long timestamp) { |
| SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); |
| String format = formatter.format(timestamp); |
| |
| return format; |
| } |
| } |