Develop Reference

Reading XML and Creating Multiple Tables

I have an XML input file that looks like:
<mbean className="OperatingSystem">
<attribute>
<attributeName>Arch</attributeName>
<formatter>STRING</formatter>
</attribute>
<attribute>
<attributeName>ProcessCpuLoad</attributeName>
<formatType>PERCENT</formatType>
</attribute>
</mbean>
I've created a POJO called 'Mbeans' that looks like:
#XmlRootElement(name = "mbean")
#XmlAccessorType(XmlAccessType.FIELD)
public class Mbean
{
#XmlElement(name = "attribute")
private List<Attribute> attributes = null;
#XmlAttribute(name = "className")
private String className;
public String getClassName() {
return className;
}
}
I can successfully unmarshall my XML File into this POJO and my application can use this object as needed. This input file tells me the information I need to pull from a particular MBean I have. Is there a way to create multiple tables based on the XML file, such that when I pull said information I can store that information into said table structure and then use JDBC to create SQL tables on my H2 database?
For example, I would like to create tables that look like:
+------------------------+
| MBeans |
+------+-----------------+
| ID | MBeanName |
+------+-----------------+
| 1 | OperatingSystem |
+------+-----------------+
+--------------------------------+
| Attributes |
+------+--------+----------------+
| ID | MbeanId| AttributeName |
+------+--------+----------------+
| 1 | 1 | Arch |
+------+--------+----------------+
| 2 | 1 | ProcessCpuLoad |
+------+--------+----------------+
+------------------------------------+
| OperatingSystem.Arch |
+------+--------+------------+-------+
| ID | MbeanId| AttributeId| Value |
+------+--------+------------+-------+
| 1 | 1 | 1 | amd64 |
+------+--------+------------+-------+
| 2 | 1 | 1 | amd64 |
+------+--------+------------+-------+
+------------------------------------+
| OperatingSystem.ProcessCpuLoad |
+------+--------+------------+-------+
| ID | MbeanId| AttributeId| Value |
+------+--------+------------+-------+
| 1 | 1 | 2 | 0.009 |
+------+--------+------------+-------+
| 2 | 1 | 2 | 0.0691|
+------+--------+------------+-------+

I would first make :
A method mapping className into table name public String getTableName(String className)
A method mapping attributeName into clomun name public String getColumnName(String attributeName)
A method mapping formatType or formatter into the database types public String getType(String formatType)
and then
public void createTable(Mbean bean) throws SQLException{
String sql = getCreateTable(bean);
// execute SQL using JDBC...
}
private String getCreateTable(Mbean bean) {
String sqlStart = "CREATE TABLE " + getTableName(bean.getClassName()) + " (" ;
return bean.getAttributes().stream()
.map(attribute -> mapToColumn(attribute))
.collect(Collectors.joining(", ", sqlStart, ")"); // what about primary key?
}
private String mapToColumn(Attribute a) {
return getColumnName(a.getName()) + " " + getType(/*it depends*/);
}

Parsing SPARQL Result into jtable

I'm working on an Apache Jena project. I've got a Fuseki server running on my localhost.
I want to create a Java Program for my Fuseki server, that shows all the data in the triplestore in a JTable. I just have no idea how to parse the result from my query into a JTable.
My code sofar:
(left out the part where the window, table, frame etc is created)
private void Go() {
String query = "SELECT ?subject ?predicate ?object \n" +
"WHERE { \n" +
"?subject ?predicate ?object }";
Query sparqlQuery = QueryFactory.create(query, Syntax.syntaxARQ) ;
QueryEngineHTTP httpQuery = new QueryEngineHTTP("http://localhost:3030/AnimalDataSet/", sparqlQuery);
ResultSet results = httpQuery.execSelect();
System.out.println(ResultSetFormatter.asText(results));
while (results.hasNext()) {
QuerySolution solution = results.next();
}
httpQuery.close();
}
The sysout prints this, which is the correct data:
-------------------------------------------------------------------------------------------------------------------------------------
| subject | predicate | object |
=====================================================================================================================================
| <urn:animals:data> | <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> | <http://www.w3.org/1999/02/22-rdf-syntax-ns#Seq> |
| <urn:animals:data> | <http://www.w3.org/1999/02/22-rdf-syntax-ns#_1> | <urn:animals:lion> |
| <urn:animals:data> | <http://www.w3.org/1999/02/22-rdf-syntax-ns#_2> | <urn:animals:tarantula> |
| <urn:animals:data> | <http://www.w3.org/1999/02/22-rdf-syntax-ns#_3> | <urn:animals:hippopotamus> |
| <urn:animals:lion> | <http://www.some-ficticious-zoo.com/rdf#name> | "Lion" |
| <urn:animals:lion> | <http://www.some-ficticious-zoo.com/rdf#species> | "Panthera leo" |
| <urn:animals:lion> | <http://www.some-ficticious-zoo.com/rdf#class> | "Mammal" |
| <urn:animals:tarantula> | <http://www.some-ficticious-zoo.com/rdf#name> | "Tarantula" |
| <urn:animals:tarantula> | <http://www.some-ficticious-zoo.com/rdf#species> | "Avicularia avicularia" |
| <urn:animals:tarantula> | <http://www.some-ficticious-zoo.com/rdf#class> | "Arachnid" |
| <urn:animals:hippopotamus> | <http://www.some-ficticious-zoo.com/rdf#name> | "Hippopotamus" |
| <urn:animals:hippopotamus> | <http://www.some-ficticious-zoo.com/rdf#species> | "Hippopotamus amphibius" |
| <urn:animals:hippopotamus> | <http://www.some-ficticious-zoo.com/rdf#class> | "Mammal" |
-------------------------------------------------------------------------------------------------------------------------------------
I really hope someone here knows how to parse the data from the query into a JTbale :D
Thanks in advance!

I've done some further research and finally found the solution! It's quite easy actually.
You just simply change the while loop like this:
while(rs.hasNext())
{
QuerySolution sol = rs.nextSolution();
RDFNode object = sol.get("object");
RDFNode predicate = sol.get("predicate");
RDFNode subject = sol.get("subject");
DefaultTableModel model = (DefaultTableModel) table.getModel();
model.addRow(new Object[]{subject, predicate, object});
}
And that works fine for me!
For everyone who's interested, i've puplished my version as it is now to pastebin which has comments:
The link to the full (current) version of my project

Spring,Hibernate with mysql image is not displaying properly

Yesterday I have posted this question..But did not get any answer.
In my project I have stored image file in mysql database.
the table is like:
+-----------+---------------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+-----------+---------------------+------+-----+---------+----------------+
| upload_id | int(11) | NO | PRI | NULL | auto_increment |
| uId | int(20) unsigned | NO | MUL | NULL | |
| file_name | varchar(128) | YES | | NULL | |
| file_data | longblob | YES | | NULL | |
+-----------+---------------------+------+-----+---------+----------------+
Now I am fetching image data my dao class is:--
public List<ImageClass> fetchallimage(int uId) {
ImageClass imageClass= new ImageClass(uId);
String hql = "FROM ImageClass WHERE uId = :uId1 ";
Query query = (Query) sessionFactory.getCurrentSession().createQuery(hql).setParameter("uId1", imageClass.getUserId());
return query.list();
}
My ImageClass is:--
#Table(name = "imageStore")
public class ImageClass{
private long id;
private String fileName;
private byte[] data;
---getters and settrs with #Column annotations----
}
My controller class is:-
#RequestMapping(method = RequestMethod.GET)
public String ImageFetch(Map<String, Object> map,HttpServletRequest request,
HttpSession session,HttpServletResponse response) {
int uid= (int) session.getAttribute("uId");
List<ImageClass> imageClass;
imageClass= PicService.fetchallimage(uid);
map.put("image",imageClass);
return "account";
}
}
and jsp page is:-
<c:forEach items="${image}" var="info">
<div style="width:380px;display:block;text-align:center;">
<img src="${info.data}"
border="0" alt="Dating" style="margin:10px;padding:15px;border:10px solid #FEB4DE;background:#FECDE9;"></div>
</c:forEach>
But the picture is displaying,like below:-
In page image looks like: [B#1284b24
why??what I have to do to achieve the image??Please guys suggest me.
I have edited :--
for (ImageClass temp : imageClass) {
byte[] encodeBase64 = Base64.encode(temp.getData());
String base64Encoded = new String(encodeBase64, "UTF-8");
map.put("image",base64Encoded); }
and in jsp :--<img src="data:image/jpeg;base64,${image}" />
still not getting picture.
in logger I am getting output:--

You have to convert that imageTo String and then you can easily display in JSP. I presume its a byte[]. Use a #Transient variable, it will help :
import sun.misc.BASE64Encoder;
BASE64Encoder base64Encoder = new BASE64Encoder();
object.setTransientString("data:image/png;base64," + base64Encoder.encode(object.getByteArrayDataVariable()));
In jsp, use the img tag and put the String variable there. Enjoy.

Using cassandra triggers

I'm have a cassandra table like this:
keyspace_name| columnfamily_name | column_name | component_index |
-------------+-------------------+-------------+-----------------+
aw | test | as_of_date | 0 |
aw | test | data | 1 |
aw | test | record_id | null |
aw | test | upload_time | 1 |
And I'm won't to create trigger that will print(slf4j for example) rows that whould be inserted in next format:
key = key1
column_name1=value1
column_name2=value2
...
column_namen=valuen
Is it possible to get column name in trigger?
I try example from the internet, but it prints incorrect data.
public Collection<RowMutation> augment(ByteBuffer key, ColumnFamily update) {
String localKey = new String(key.array(), Charset.forName("UTF-8"));
logger.info("key={}.", localKey);
for (Column cell : update) {
try {
String name = ByteBufferUtil.string(cell.name());
logger.info("name={}.", name);
String value = ByteBufferUtil.string(cell.value());
logger.info("value={}.", value);
} catch (Exception e) {
logger.info("Exception={}.", e.getMessage());
}
}
As I understand, i am must convert cell.value() to specific data type like this:
Date date = TimestampType.instance.compose(cell.value());
But I don't know, how to detect field type and i am don't understand why i can't get column name using ByteBufferUtil.string(cell.name()).

To properly format cellname and values you must use the CFMetaData. The correct version of the code should be:
public Collection<Mutation> augment(ByteBuffer key, ColumnFamily update)
{
CFMetaData cfm = update.metadata();
String localKey = cfm.getKeyValidator().getString(key);
logger.info("key={}.", localKey);
for (Cell cell : update)
{
try
{
String name = cfm.comparator.getString(cell.name());
logger.info("name={}.", name);
String value = cfm.getValueValidator(cell.name()).getString(cell.value());
logger.info("value={}.", value);
} catch (Exception e) {
logger.info("Exception={}.", e.getMessage());
}
}
return Collections.emptyList();
}

List the child nodes in tree when parent expanded

I have a problem in implementing the tree structure of OID. when I click the parent , i need to display only child details, not the sub child of a child.
i.e., i need not display an OID which contains a "." (dot).
For example, if my OID structure is private.MIB.sample.first
private.MIB.sample.second and so on.
when I click on MIB, it should display only "sample" not first and second.
first and second is to be displayed when I click sample.
How can I implement this in java.
My datyabase is MySQL. The code which I tried is given below
FilteredRowSet rs = new FilteredRowSetImpl();
// for Other Types Like OBJECT-TYPE, Object_IDENTIFIER
rs = new FilteredRowSetImpl();
rs.setCommand("Select * from MIBNODEDETAILS where " + "mn_OID like '" + OID
+ ".%' order by mn_NodeType, mn_OID");
rs.setUrl(Constants.DB_CONNECTION_URL);
rs.setFilter(new MibRowFilter(1, expString));
rs.execute();
rs.absolute(1);
rs.beforeFirst();
I guess the change is to be made in the setCommand argument.
How can I do this?
Structure of mobnodedetails table
+--------------------+-------------------+-------------+
| mn_OID | mn_name | mn_nodetype |
+--------------------+-------------------+-------------+
| 1 | iso | 0 |
| 1.3 | org | 1 |
| 1.3.6 | dod | 1 |
| 1.3.6.1 | internet | 1 |
| 1.3.6.1.1 | directory | 1 |
| 1.3.6.1.2 | mgmt | 1 |
| 1.3.6.1.2.1 | mib-2 | 0 |
| 1.3.6.1.2.1.1 | system | 1 |
| 1.3.6.1.2.1.10 | transmission | 1 |

You can use something like
SELECT *
FROM mibnodedetails
WHERE mn_oid LIKE "+mn_OID+"%
AND LENGTH ("+mn_OID+") + 2 = LENGTH (mn_oid)
ORDER BY mn_nodetype, mn_oid
So if you pass mm_OID as 1.3.6.1 (|1.3.6.1 |internet |1 |)
You will get following result:
| 1.3.6.1.1 | directory | 1 |
| 1.3.6.1.2 | mgmt | 1 |
Working Demo
PS: This will not work for child more than 9 as we are using length + 2

The function given below dispalys the tree as required.
public void populateMibValues()
{
final DefaultTreeModel model = (DefaultTreeModel) this.m_mibTree.getModel();
model.setRoot(null);
this.rootNode.removeAllChildren();
final String query_MibNodeDetailsSelect = "Select * from MIBNODEDETAILS where LENGTH(mn_oid)<=9 "
+ " and mn_OID<='1.3.6.1.4.1' order by mn_OID"; // only
this.innerNodeNames.clear();
this.innerNodes.clear();
this.innerNodesOid = null;
try {
final ResultSet deviceRS = Application.getDBHandler().executeQuery(query_MibNodeDetailsSelect, null);// inner
// nodes
while (deviceRS.next()) {
final mibNode mb = new mibNode(deviceRS.getString("mn_OID").toString(), deviceRS.getString("mn_name")
.toString());
mb.m_Type = Integer.parseInt(deviceRS.getString("mn_nodetype").toString());
createMibTree(mb);
}
}
catch (final Exception e) {
Application.showErrorInConsole(e);
NmsLogger.writeErrorLog("ERROR creating MIB tree failed", e.toString());
}