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Apache OODT Common Utilities Project
/*
* 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.oodt.commons.activity;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;
/**
This class enables retrieval of activity incidents from just about
any database management system. It should support MySQL, PostgreSQL,
Oracle and Sybase.
This class uses the following properties:
org.apache.oodt.commons.activity.SQLDatabaseRetrieval.driver
Must contain the name of the JDBC driver class. See the following
examples:
- com.mysql.jdbc.Driver
- org.postgresql.Driver
- oracle.jdbc.driver.OracleDriver
- com.sybase.jdbc2.jdbc.SybDriver
org.apache.oodt.commons.activity.SQLDatabaseRetrieval.url
Must contain the URL specification for the target database. See the
following examples:
- jdbc:mysql://host:port/database
- jdbc:postgresql://host:port/database
- jdbc:oracle:thin:@host:port:database
- jdbc:sybase::Tds:host:port/database
org.apache.oodt.commons.activity.SQLDatabaseRetrieval.user
Must contain the user name for the target database.org.apache.oodt.commons.activity.SQLDatabaseRetrieval.password
Must contain the password for the target database.
This class expects the following table to exist in the target
database (data types will vary depending on the vendor):
create table incidents (
activityID varchar(32) not null,
className varchar(255) not null,
occurTime bigint not null default 0,
detail text null,
primary key (activityID, className, occurTime))
@author S. Hardman
@version $Revision: 1.1 $
*/
public class SQLDatabaseRetrieval implements Retrieval {
/** The database driver.
*/
private String driver;
/** The URL for the database.
*/
private String url;
/** The user name for the database.
*/
private String user;
/** The password associated with the user name.
*/
private String password;
/** The database connection.
*/
private Connection connection;
/**
This constructor grabs the necessary system properties for the database connection.
*/
public SQLDatabaseRetrieval() {
// Grab the properties and make sure they are all there.
driver = System.getProperty("org.apache.oodt.commons.activity.SQLDatabaseRetrieval.driver");
url = System.getProperty("org.apache.oodt.commons.activity.SQLDatabaseRetrieval.url");
user = System.getProperty("org.apache.oodt.commons.activity.SQLDatabaseRetrieval.user");
password = System.getProperty("org.apache.oodt.commons.activity.SQLDatabaseRetrieval.password");
if ((driver == null) || (url == null) || (user == null) || (password == null)) {
throw new IllegalStateException("SQLDatabaseRetrieval(): Required system properties `org.apache.oodt.commons.activity.SQLDatabaseRetrieval.[driver,url,user,password]' are not completely defined.");
}
}
/**
Retrieve the list of activities.
@return A list of {@link StoredActivity} classes.
@throws ActivityException If an error occurs opening or accessing the database.
*/
public List retrieve() throws ActivityException {
Connection conn = null;
Statement stmt = null;
List activities = new ArrayList();
try {
conn = openConnection();
stmt = conn.createStatement();
String sqlCmd = "SELECT activityID, className, occurTime, detail FROM incidents ORDER BY activityID, occurTime";
String activityID = "";
StoredActivity activity = null;
ResultSet rs = stmt.executeQuery(sqlCmd);
while (rs.next()) {
String currActivityID = rs.getString(1);
if (!activityID.equals(currActivityID)) {
activity = new StoredActivity(currActivityID);
activities.add(activity);
activityID = currActivityID;
}
activity.addIncident(new StoredIncident(rs.getString(2), rs.getLong(3), rs.getString(4)));
}
return (activities);
}
catch (ClassNotFoundException e) {
throw new ActivityException("SQLDatabaseRetrieval.retrieve(): An exception occurred locating the JDBC driver class.", e);
}
catch (SQLException e) {
throw new ActivityException("SQLDatabaseRetrieval.retrieve(): An exception occurred opening or accessing the database.", e);
}
finally {
try {
if (stmt != null) {
stmt.close();
}
if (conn != null) {
conn.close();
}
}
catch (SQLException ignored) {}
}
}
/**
This method opens the database connection.
@returns The Connection object.
@throws ClassNotFoundException If the JDBC driver class can't be located.
@throws SQLException If an error occurs opening the database connection.
*/
private Connection openConnection() throws ClassNotFoundException, SQLException {
Class.forName(driver);
return (DriverManager.getConnection(url, user, password));
}
/**
Execute the SQLDatabaseRetrieval class via the command-line.
The program exits with status 0 on success, 1 on failure.
@param argv The command-line arguments.
*/
public static void main(String[] argv) {
try {
SQLDatabaseRetrieval retrieval = new SQLDatabaseRetrieval();
List activities = retrieval.retrieve();
for (Object activity1 : activities) {
StoredActivity activity = (StoredActivity) activity1;
System.out.println("Activity: " + activity.getActivityID());
List incidents = activity.getIncidents();
for (Object incident1 : incidents) {
StoredIncident incident = (StoredIncident) incident1;
System.out.println(
" Incident: " + incident.getClassName() + ", " + incident.getOccurTime() + ", " + incident
.getDetail());
}
}
System.exit(0);
}
catch (Exception e) {
Throwable cause = e.getCause();
String message = "";
if (cause != null) {
System.err.println(e.getMessage() + " Additional information: " + cause.getMessage());
}
else {
System.err.println(e.getMessage());
}
System.exit(1);
}
}
}