Question about JDBC in BlazeDS?

stupid question: is their a JDBC driver already installed with BlazeDS? I am currently installing BlazeDS in tomcat. Do i need to install the connector j separately, or does this come with BlazeDS? thanks

The turnkey install ships with samples that use the HyperSQL database. The JDBC driver for this databse can be found in tomcat\webapps\samples\WEB-INF\lib\hsqldb.jar. If you want to connect to a different database then you'll need to download and deploy the JDBC driver for that database.
The non-turnkey install does not contain a JDBC driver.

Similar Messages

####a question about jdbc driver

A question about jdbc driver: for Oracle JDBC drivers which will not allow O/R
tools to access columns over 4 kb. This affects some of the functionality of my
application.A workaround is to use the my JDBC driver that acts as a wrapper to
ensure that columns over 4 kb read and persist properly. my JDBC driver determines
which actual driver to load based on the connection URL. If you pass in a URL
that contains the string jdbc:oracle:thin, it will know to load oracle.jdbc.driver.OracleDriver.
If the URL contains the string jdbc:db2, it will know to load COM.ibm.db2.jdbc.net.DB2Driver,
and so on.
now i have set CLASSPATH for my jdbc wapper,when I Creating and Configuring a
JDBC Connection Pool,i have to input my driver name such com.lawrence.driver.....then
i did,all
is well,then i restart my WLS,when load config.xml,some errors such as "No registered
driver accept URL:jdbc:oracle:thin:@localhost:1521:lawrence",if i set driver name
is oracle.jdbc.driver.OracleDriver,all is good,no any errors.
I find some questions like:
1.for WLS8.1 ,it is only find some registed driver?
2.why it cannot load my driver wapper when it is loading jdbc Connection Pool,but
when the WLS start is finished, i Creating and Configuring a JDBC Connection Pool
then it is right?

my JDBC driver like this:
public class myDriver implements Driver {
     public static String DB2_DRIVER = "COM.ibm.db2.jdbc.net.DB2Driver";
     public static String DB2_URL = "jdbc:db2:";
     public static String HYPERSONIC_DRIVER = "org.hsqldb.jdbcDriver";
     public static String HYPERSONIC_URL = "jdbc:hsqldb:";
     public static String MYSQL_DRIVER = "com.mysql.jdbc.Driver";
     public static String MYSQL_URL = "jdbc:mysql:";
     public static String ORACLE_DRIVER = "oracle.jdbc.driver.OracleDriver";
     public static String ORACLE_URL = "jdbc:oracle:";
     public static String POSTGRESQL_DRIVER = "org.postgresql.Driver";
     public static String POSTGRESQL_URL = "jdbc:postgresql:";
     public static String SQLSERVER_DRIVER =
          "com.microsoft.jdbc.sqlserver.SQLServerDriver";
     public static String SQLSERVER_URL = "jdbc:microsoft:";
     public boolean acceptsURL(String url) throws SQLException {
          return true;
     public synchronized Connection connect(String url, Properties props)
          throws SQLException {
          if (_driver == null) {
               Class driverClass = null;
               try {
                    if (url.startsWith(DB2_URL)) {
                         driverClass = Class.forName(DB2_DRIVER);
                    else if (url.startsWith(HYPERSONIC_URL)) {
                         driverClass = Class.forName(HYPERSONIC_DRIVER);
                    else if (url.startsWith(MYSQL_URL)) {
                         driverClass = Class.forName(MYSQL_DRIVER);
                    else if (url.startsWith(ORACLE_URL)) {
                         driverClass = Class.forName(ORACLE_DRIVER);
                    else if (url.startsWith(POSTGRESQL_URL)) {
                         driverClass = Class.forName(POSTGRESQL_DRIVER);
                    else if (url.startsWith(SQLSERVER_URL)) {
                         driverClass = Class.forName(SQLSERVER_DRIVER);
                    _driver = (Driver)driverClass.newInstance();
               catch (Exception e) {
                    throw new SQLException(e.getMessage());
          Connection con = _driver.connect(url, props);
          return new myConnection(con);
     public int getMajorVersion() {
          return _driver.getMajorVersion();
     public int getMinorVersion() {
          return _driver.getMinorVersion();
     public DriverPropertyInfo[] getPropertyInfo(String url, Properties props)
          throws SQLException {
          return _driver.getPropertyInfo(url, props);
     public boolean jdbcCompliant() {
          return _driver.jdbcCompliant();
     private Driver _driver;

A question about JDBC and MySQL

hello dear friends,ask a question:
if in MySQL database, i have defined a clumon as TEXT data type.
when i use JDBC, i use which kind of java data type to hold TEXT,
i mean which getXXX() method i should use.
is it possible i just use getObject() and cast it to a binarystream??
thanks in advanced.

use this:
declare it 1st
String x ="";
then u can now get the value of the field...
x = getString("<fieldName>");is there length limitation?
for example, i want store a String which is got from a JTextArea, i also treat it as String and insert into the column with TEXT datatype like
insert table_name (text_column) values( string_1)
this works in JSP, should work in JAVA too...
hope i helped... ^_^

Who can help me?I have a question about JDBC with SQL Server 2000.

import java.sql.*;
import java.util.*;
public class sqltest{
static public void main(String args[]){
try{
Class.forName("com.microsoft.jdbc.sqlserver.SQLServerDriver");
}catch(Exception e){
e.printStackTrace();
return;
try{
Connection conn=DriverManager.getConnection("jdbc:microsoft:sqlserver://CE800:1181;UseDatabaseName=supermarket;user=sa;Password=");
Statement stmt = conn.createStatement();
ResultSet rs = stmt.executeQuery("select * from customers");
while(rs.next()){
System.out.println(rs.getString("username"));
conn.close();
}catch(Exception e){
e.printStackTrace();
return;
when I run it,error occured:
D:\MyJava\sql>java sqltest
java.sql.SQLException: [Microsoft][SQLServer 2000 Driver for JDBC][SQLServer]Invalid object name 'customers'.
at com.microsoft.jdbc.base.BaseExceptions.createException(Unknown Source)
at com.microsoft.jdbc.base.BaseExceptions.getException(Unknown Source)
at com.microsoft.jdbc.sqlserver.tds.TDSRequest.processErrorToken(Unknown Source)
at com.microsoft.jdbc.sqlserver.tds.TDSRequest.processReplyToken(Unknown Source)
at com.microsoft.jdbc.sqlserver.tds.TDSExecuteRequest.processReplyToken(Unknown Source)
at com.microsoft.jdbc.sqlserver.tds.TDSRequest.processReply(Unknown Source)
at com.microsoft.jdbc.sqlserver.SQLServerImplStatement.getNextResultType(Unknown Source)
at com.microsoft.jdbc.base.BaseStatement.commonTransitionToState(Unknown Source)
at com.microsoft.jdbc.base.BaseStatement.postImplExecute(Unknown Source)
at com.microsoft.jdbc.base.BaseStatement.commonExecute(Unknown Source)
at com.microsoft.jdbc.base.BaseStatement.executeQueryInternal(Unknown Source)
at com.microsoft.jdbc.base.BaseStatement.executeQuery(Unknown Source)
at sqltest.main(sqltest.java:15)
Please help me,thanks a lot!

Your code seems ok, you probably end up in another Database than you expect.
Not sure about the the UseDatabaseName=supermarket clause in your connection string.
You can confirm that get a connection to another database by changing your query to:
SELECT * FROM supermarket.dbo.customers
if this works you probably get a connection to master and should look closer at the UseDatabaseName=supermarket clause.
You did try to run the query in the Query Analyzer i take it?
Rgds

Questions about JDBC-Drivers

Hi,
I'm working with JDBC-Drivers for the first time.
How can I get detailed information about the database, subprotocol etc. the driver supports. In ODBC there exist some information functions like SQLGetInfo to explore drivers. But there seems to be no way to do this with JDBC.
Can anybody give me some advice how to get this information ?
J�rgen

Hi,
after instantiating an object implementing the Driver interface I want to know what database this driver works for. If possible, this should be done without connecting to the database. I supposed a driver should store such information in itself but there seems no way to get this information.
The Driver interface declares a method 'getPropertyInfo' to extract information about the possible properties for this driver. Unfortunately I didn't found any description what lookup strings can be used.
Do you know how to go on ?
Thanks and regards
Jugi

Question about JDBC and Oracle 10g AL32UTF8

Hey all,
Currently I have a Java program that uses lib: ojdbc14.zip. It works fine for our Oracle 10g database, but when we converted our character set to AL32UTF8, our program seems to have stopped working properly. For instance, I grab a count(*), to see how many rows an ID has in a table. Then I take that list and display and count(*) that are greater than 0. Well, my first getString works properly to generate the select count(*) statements for all the tables in the database. But then when I execute those select count(*) I can grab out the number greater than 0. That's column 1. Then the owner name is displayed in column 2. and the table name is displayed in column 3. When I do a getString(2) we only get the first letter (sometimes) of the owner of the table. Same with the table name.
For instance, before AL32UTF8
getString(2): SCOTT
getString(3): PEOPLE
After
getString(2): S
getString(3): P
Now to open my connection I use:
static Connection conn;
DriverManager.registerDriver(new oracle.jdbc.driver.OracleDriver());
conn = DriverManager.getConnection(connection_string, username, password);
And to create query I use:
Statement query_1 = conn.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_READ_ONLY);
Any help will be greatly appreciated. Thanks
Sincerely,
Mel

orkun wrote:
I was wondering whether it was a correct way :
-retrieving data with resultset and putting them to an arraylist, then getting to jsf datatable.Your question/problem statement is unclear, but just lookup the DAO pattern.
Is there any better way I can speed up retrieving data from databse ?Performance is a matter of good code and datamodel and decent hardware.

Question about jdbc and jsf datatable

hello
I was wondering whether it was a correct way :
-retrieving data with resultset and putting them to an arraylist, then getting to jsf datatable.
or
Is there any better way I can speed up retrieving data from databse ?
regards

orkun wrote:
I was wondering whether it was a correct way :
-retrieving data with resultset and putting them to an arraylist, then getting to jsf datatable.Your question/problem statement is unclear, but just lookup the DAO pattern.
Is there any better way I can speed up retrieving data from databse ?Performance is a matter of good code and datamodel and decent hardware.

Questions about JDBC connection

We have an oracle database and several jsp pages which previously worked fine. Recently, problem happens when we are using a browser to load a jsp file with the lines of database query. We are using:
Linux kernal 2.4.2-2
Apache 1.3.12
Oracle8i Enterprise Edition Release 8.1.7.0.1
LSNRCTL for Linux: Version 8.1.7.0.0
We already startup the database, start the listener and the apache service. It seems whenever we are trying to open a jsp page with database query, it hangs at the line:
Connection conn = DriverManager.getConnection("jdbc:oracle:oci8:@"+dbname,dbuser,dbpasswd);
It has no problem to load the plain html file and the jsp file without dababase connection.
Does anyone have any clue what might be going on here?
Thanks!
-Juchang

Is the OCI dll in the PATH?
Obtain a connection with a data source instead of DriverManager.

A question about compatiblilty of JDBC

Hi, there,
I have a question about JDBC 3.0 in JDK1.4.1.
We build a .jar using JDK1.4.1 and this .jar file
provides JDBC 3.0 interface.
I then tried to call the interface under JDK1.3.1
but it keeps asking me about the getParameterMetaData()
in PreparedStatement.
(The error message like this:
Exception in thread "main" java.lang.NoClassDefFoundError: java/sql/ParameterMetaData dbmaker.sql.JdbcOdbcConnection.prepareStatement(JdbcOdbcConnection.java:257)
I did implement the getParameterMetaData() method,
but I didn't call this method in my testing program.
It's quite strange since when JDK1.2 was release,
we implemented the getBlob() method in
ResultSet class and there's no problem when we
use JDK1.1 run time to call this ResultSet object.
Could any one tell me why? Is this caused by a
compatibility problem between JDK1.4 and the
older versions of JDK?

Hi, there,
Let me outline the condition by examples so that maybe you can help me. PLEASE! Could somebody tell us what's wrong?
- CASE 1:
In JDK1.2, we implemented a new method getBlob which returns the type of Blob (this is done according to JDBC 2.0 specification.) in ResultSet class. We can use the .jar compiled by jdk1.2 in jdk1.1 environment.
e.g. We make a xyz.jar by jdk1.2 and the xyz.jar includes new method getBlob in ReaultSet class. Then, one java application including ResultSet class CAN run under jdk1.1 with xyz.jar, if the method ResultSet.getBlob() is not called.
- CASE 2:
BUT, the following case which is the same as in the above condition will fail in jdk1.3 environment.
In JDK 1.4, we implemented a new method getParameterMetaData() which returns the type of ParameterMetaData. (BTW, this is done according to JDBC 3.0 specification.) in PreparedStatement class. We CANNOT use the .jar compiled by jdk1.4 in jdk1.3 environment.
e.g. We make a ttt.jar by jdk1.4 and ttt.jar includes the new method getParameterMetaData() in PreparedStatement class. Then, one java application including PreparedStatement class CANNOT be run under jdk1.3 with ttt.jar, even when the method PreparedStatement.getParameterMetaData() is not called.

Question about BlazeDS Channel internals

There is much useful information available about how an application developer would use BlazeDS to implement their application, but there is a shortage of information about how BlazeDS is implemented. There are very general architecture diagrams, but no information on the actual network technologies employed. This information is essential for forming estimates of the server hardware requirements of a design. The alternative is to build the application one way, and then discover the performance characteristics afterwards.
For one feature of my application, the ideal structure would be to give the clients and mx.Consumer to receive non-polling stream of changes replicated from the database. In this particular feature, there would be no subtopics, each client would receive the same data. The question is would BlazeDS/Flex give each client 1 persistent socket to support the stream. If this is the case, then this design poses a very significant load on the server. It makes it easy for the developer, because he writes to only one topic, but if under the covers, the server is writing to one socket for each client. It will require a lot of hardware.
Or, to state the question another way, would BlazeDS/flex use multicast, when there is a client Consumer subscribing to a topic, with no subtopics?

I have just found one clear statement in the BlazeDS documentation with regard to sockets when streaming:
"The Servlet API uses blocking IO so as with long polling above, you must set a configured upper bound on the number of streaming connections you allow. Clients that exceed this limit are not able to open a streaming connection and will fall back to the next channel in their channel set."
BlazeDS Developer Guide, page 50.
This I did not expect, since non-blocking IO has been part of Java for over 5 years in the NIO package. If I were to deploy BlaseDS on an Intel sized box, I suspect the blocking IO would limit me to maybe 300 concurrent users. If this is true, it means that both streaming and long polling are unusable for almost any application on the public web.
Maybe the only option is to write a server in Java NIO that communicates with Flash Sockets.
Did I miss something?

Question about sql batch process in java app

hi all
i have few questions about using batch process in the java.sql package. the addBatch method can take sql statements like inserts or updates. can we use a mixture of insert and update then? can we use prepared statement for this? it's just for performance consideration. thanks in advance.

hi all
i have few questions about using batch process in the
java.sql package. the addBatch method can take sql
statements like inserts or updates. addBatch() is a method that has no parameters. It doesn't 'add' sql statements.
can we use a
mixture of insert and update then? can we use
prepared statement for this? it's just for
performance consideration. thanks in advance.The point of batching is that you take something that is invariant and then 'add' a variant part.
Thus a single insert has an invariant part (the table and specific columns) and a variant part (the data for each row by column.)
You can use anything that is valid SQL (for jdbc, driver, database) and use it presuming your database allows that particular usage in batching. But that does require some regular pattern - it won't work if your usage is random. Nor will it work if some statements need to be executed only some of the time. Finally also note that transaction processing will often require smaller chunks - you can't insert a million rows in one batch.

Question about Finder-Load-Beans flag

Hi all,
I've read that the Finder-Load-Beans flag could yield some valuable gains in performance
but:
1) why is it suggested to do individual gets of methods within the same Transaction
? (tx-Required).
2) this strategy is useful only for small sets of data, isn't it? I imagine I
would choose Finder-Load-Beans to false (or JDBC) for larger sets of data.
3) A last question: its default value is true or false ?
Thanks
Francesco

Because if there are different transactions where the get method is called
then the state/data of the bean would most be reloaded from the database. A
new transactions causes the ejbLoad method to be invoked in the beginning
and the ejbStore at the end. That is the usual case but there are other ways
to modify this behavior.
Thanks
Gaurav
"Francesco" <[email protected]> wrote in message
news:[email protected]...
>
Hi thorick,
I have found this in the newsgroup. It's from R.Woolen answering
a question about Finder-Load-Beans flag.
"Consider this case:
tx.begin();
Collection c = findAllEmployeesNamed("Rob");
Iterator it = c.iterator();
while (it.hasNext()) {
Employee e = (Employee) it.next(); System.out.println("Favorite color is:"+ e.getFavColor());
tx.commit();
With CMP (and finders-load-beans set to its default true value), thefindAllEmployeesNamed
finder will load all the employees with the name of rob. The getFavColormethods
do not hit the db because they are in the same tx, and the beans arealready loaded
in the cache.
It's the big CMP performance advantage."
So I wonder why this performance gain can be achieved when the iterationis inside
a transaction.
Thanks
regards
Francesco
thorick <[email protected]> wrote:
1) why is it suggested to do individual gets of methods within thesame Transaction
? (tx-Required).I'm not sure about the context of this question (in what document,
paragraph
is this
mentioned).
2) this strategy is useful only for small sets of data, isn't it? Iimagine I
would choose Finder-Load-Beans to false (or JDBC) for larger sets ofdata.
>
If you know that you will be accessing the fields of all the Beans that
you get back from a
finder,
then you will realize a significant performance gain. If one selects
100s or more beans
using
a finder, but only accesses the fields for a few, then there may be some
performance cost.
It could
depend on how large some of the fields are. I'd guess that the cost
of 1 hit to the DB per
bean vs.
the cost of 1 + maybe 1 more hit to the DB per bean, would usually be
less. A performance
test using
your actual apps beans would be the only way to know for sure.
3) A last question: its default value is true or false ?The default is 'True'
-thorick

3 important questions about SAP HANA

Hello Community!
I have got 3 important questions about SAP HANA.
1.
- Our Company has all up about 150 SAP - Systems.
- 12 Systems are ERP-Systems.
=> We consider about SAP HANA at the moment.
=> Is it possible to put all the 12 ERP-Systems in ONE SAP HANA or do I need one seperate HANA for each ERP-System?
=> If it is possible, can you tell me the disadvantages when I use 1 HANA for the 12 ERP-Systems.
=> Is there a Storage-Limit in the HANA (I think no, because of 64 bit).
=> Can I still make realtime-analytics with 1 HANA for 12 SAP Systems?
2.
=> Can I run ONE HANA with different non-SAP-Systems?
3.
=> Is there a Demo-Center from SAP or IBM, where I can test and see the HANA before I buy it?
(I do not mean the Fujitsu TDS Demo Center)
It would be nice, when you would answer all my questions.
Thank you.

I have got 3 important questions about SAP HANA.
1.
- Our Company has all up about 150 SAP - Systems.
- 12 Systems are ERP-Systems.
=> We consider about SAP HANA at the moment.
=> Is it possible to put all the 12 ERP-Systems in ONE SAP HANA or do I need one seperate HANA for each ERP-System? Yes it is quite possible to put all the ERP/CRM/SCM or other components on one HANA. You need to check for pricing/users/RAM (storage)
=> If it is possible, can you tell me the disadvantages when I use 1 HANA for the 12 ERP-Systems.
There are no disadvantages as of now.. improve existing planning, forecasting, pricing
optimization and other processes
=> Is there a Storage-Limit in the HANA (I think no, because of 64 bit).
There is no limit on Stotrage: You need check how much Data you need on RAM (Real time processing) Storage.Minimum you can buy is 64 GB and multiple of it for (RAM)
=> Can I still make realtime-analytics with 1 HANA for 12 SAP Systems?
Yes certainly..
2.
=> Can I run ONE HANA with different non-SAP-Systems?
YEs you can run HANA for 3rd party S/W or non-sap systems for your real time anlytics.
It has ODBC and JDBC both and you can combine it with other systems.
3.
=> Is there a Demo-Center from SAP or IBM, where I can test and see the HANA before I buy it?
(I do not mean the Fujitsu TDS Demo Center)
This you need to check with your local SAP Service channel..
It would be nice, when you would answer all my questions.
Thank you.
PY

Questions about your new HP Products? HP Expert Day: January 14th, 2015

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I am an HP employee.

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I'm not happy with HP. Any suggestions?

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Question about JDBC in BlazeDS?

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