XML database query through Java
Hi all.
I am collecting information about a little application i am trying to build:
I have an XML database with records divided in a lot of subdirectory (with three or four .xml files);
directories' names are defined by date in format "yyyymmdd",
the file within are "date_something.xml":
what is the best way to access it by a web app or a java class to search all the dirs adn print results in a readable way (aka not in cmd) ? I need first to define a period of time to search and then some attribute or node to print referred to some element.
I was guessing to use xpath, anyway I ve tryed JSP but it is too difficult and the query i have to do are really simple to build a full servlet.
I am learning xalan through servlet and I think in future this will be my choice but now i need to collect the data by queries without any automation, just to have results for researching and paper writing.
The main problem I found is to search a full series of directory, with transformations i can find out stuff from a single file, but how to do it for a system of directories?
Any suggestion or link to resource would be good also.
lm00 wrote:
ProjectMoon wrote:
By XML database do you mean an actual XML native database, or just a bunch of XML files in a directory structure? If it is an actual XML native database, you should probably use the XML:DB API. If they are just flat files you will need to probably make something that is able to navigate through your directory structure to the documents you want. Once you have that, you can then use XQuery or XPath to get information from those documents.The data is a bunch of directories named by date in format "yyyymmdd", inside each of these there are three or four files .xml
All files have data definitions and schemas but i dont think they are a 'database'. What do u mean "something to navigate through"? A class? Suppose I would like to do it as a webapp what should i have to do?
Yes, I basically meant a class. Before querying the XML file you need something that will retrieve its location. If it's by date you could probably concoct something that takes a Date object and returns a set of File objects. Internally it would traverse the directory trees and find the proper XML file(s).
>>
If you have a LOT of XML documents I honestly recommend something like the eXist XML Native Database, or another XND. I have been playing with them lately and they are very useful.in this case what i have to do? Take the data and put it into a database by this tool? And then I should acces it by a JSP? There is a program using Xpath instead?Well, yes. You would put the files in the XND. Although I don't know if that's useful or not in your situation. It all depends. I also think you're a bit confused as to what JSPs and XPath are...
JSPs are just Java Server Pages, which get dynamically compiled into servlets. If you are following the MVC pattern for servlets/JSP (which you should), JSPs represent your views while servlets are the controllers. The model would be your XML data in this case. XPath is a way to get at that data. If it was in an XND, you could just throw an XQuery/XPath expression at the database and it would give you back XML documents/fragments representing the results of your query. You don't have to make your own system to find the XML documents. Of course, you do have to learn how to use an XND.
Perhaps you should separate what you are trying to do. You have two problems: 1) how to get the XML data you need. 2) How to present it. You should separate those two completely and learn how to do both before attempting to put it together.
Edited by: ProjectMoon on Oct 21, 2009 12:05 PM
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I tried many ways of doing it but am just guessing as
to how to pass the data.
Thanks in Advance. - John
Here is what I am trying so far .... see snippet below:
*** Query the database ***
<sql:query var="qryBio">
SELECT
DEC_LATITUDE,
DEC_LONGITUDE,
ENTRY_TIMESTAMP
FROM app.biosurvey where
</sql:query>
*** for each row retreived from the database ***
<c:forEach var="row" items="${qryBio.rows}">
<c:set var="latvar" value="${row.dec_latitude}" scope="page"/>
<c:set var="longvar" value="${row.dec_longitude} "scope="page" />
*** java code scriptlet - ***
*** convert latitude and longitude to xpos and ypos for display ***
<%
latitude = (Float)pageContext.getAttribute("latvar");
longitude = (Float)pageContext.getAttribute("longvar");
xpos = (int)Math.round(latitude);
ypos = (int)Math.round(longitude);
xpos = 1082 - xpos;
ypos = 700 + ypos;
pageContext.setAttribute("xpos", xpos);
pageContext.setAttribute("ypos", ypos);
%>
*** plot a point on the display html page overlaying the map ***
<IMG ID="Row" SRC="smallredbox.jpg" ALT="red box"
STYLE="position:absolute;
top:<%=xposMpls%> px;
left:<%=yposMpls%> px;
z-index:2">
</c:forEach>Question:
Creating a web page and plotting points on the page:
1) Database query results in decimal values latitude and longitude.
2) Perform calculations on lati. & long. in a <% java scriptlet %>
I don't know how to pass the data back and forth between the
java server page and the java scriplet.
After the calculation translates the latitude and longitude
into xpos and ypos, a data point is plotted on a map.
I tried many ways of doing it but am just guessing as
to how to pass the data.
Thanks in Advance. - John
Here is what I am trying so far .... see snippet below:
*** Query the database ***
<sql:query var="qryBio">
SELECT
DEC_LATITUDE,
DEC_LONGITUDE,
ENTRY_TIMESTAMP
FROM app.biosurvey where
</sql:query>
*** for each row retreived from the database ***
<c:forEach var="row" items="${qryBio.rows}">
<c:set var="latvar" value="${row.dec_latitude}" scope="page"/>
<c:set var="longvar" value="${row.dec_longitude} "scope="page" />
*** java code scriptlet - ***
*** convert latitude and longitude to xpos and ypos for display ***
<%
latitude = (Float)pageContext.getAttribute("latvar");
longitude = (Float)pageContext.getAttribute("longvar");
xpos = (int)Math.round(latitude);
ypos = (int)Math.round(longitude);
xpos = 1082 - xpos;
ypos = 700 + ypos;
pageContext.setAttribute("xpos", xpos);
pageContext.setAttribute("ypos", ypos);
%>
*** plot a point on the display html page overlaying the map ***
<IMG ID="Row" SRC="smallredbox.jpg" ALT="red box"
STYLE="position:absolute;
top:<%=xposMpls%> px;
left:<%=yposMpls%> px;
z-index:2">
</c:forEach> -
Java.lang.NoClassDefFoundError: oracle/xml/sql/query/OracleXMLQuery
Hello, all.
I get this error message:
java.lang.NoClassDefFoundError: oracle/xml/sql/query/OracleXMLQuery
at oracle.xml.xsql.actions.XSQLQueryHandler.handleAction(Compiled Code) ...
when trying to view an xsql page with the jswdk 1.0.1 web server. (I have no problems when using Web-to-go)
Classpath includes:
C:\jdk1.1.8\lib\classes.zip;
C:\xsql\lib\oraclexsql.jar;
C:\xsql\lib\xmlparserv2.jar;
C:\xsql\lib\xsu111.jar;
C:\xsql\lib\classes111.zip;
C:\xsql\lib;
What could be the problem?
Mateja
null<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by Steven Muench ([email protected]):
Only thing I can think of is that maybe your server classpath is getting too long. I recall one of the Java Web Server releases having a classpath length limit that caused strange errors like this because that .jar files you thought were on your classpath were getting their path names truncated so the Java VM cannot find the JAR's.
Try putting xsu111.jar earlier in the list of JAR's and/or try shortening the classpath (perhaps by using SUBST'd drive letters or softlinks on Unix to shorten the path names).<HR></BLOCKQUOTE>
Putting the xsu11.jar file towards the start of the path did not help.
I have rewriten the entire bat file that creates the CLASSPATH and starts the server and things now seem to work. There must have been some error in the original bat file, that I just couldn't see.
Anyway - I thank you for your help.
null -
How to create an Oracle DATABASE through Java Programming Language.. ?
How to create an Oracle DATABASE through Java Programming Language.. ?
Oracle database administrators tend to be control freaks, especially in financial institutions where security is paramount.
In general, they will supply you with a database, but require you to supply all the DDL scripts to create tables, indexes, views etc.
So a certain amount of manual installation will always be required.
Typically you would supply the SQL scripts, and a detailled installation document too.
regards,
Owen
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