Database connection questions

Hello,1) Whenever I use a JDBC connection in my report, viewing that report (outside of preview) always prompts me with a database logon prompt. How do I get rid of this? 2) I would like to use JNDI for my db datasource at runtime. I found a section in the help on JNDI, but it doesn't really clarify this for me (other than it can be done). Can I specify a JNDI source in the design? If so, how?? I saw a post somewhere where someone said to just make the connection name the same as the JNDI name. I tried doing that, and I tried doing the same with the "database name" field. I couldn't get it to work. If this is the right way, what format for the JNDI name do I use? Do I use the full path "java:comp/env/jdbc/mydb" or "mydb"... etc. I tried different combinations without succes. I saw sample code that modifies the data source at runtime, I guess this could work for JNDI if I have to do it that way, but would rather keep it in the design if possible. Thanks

Hi Sean,u00C2 I implemented your code and I am getting the following exception:com.crystaldecisions.sdk.occa.report.lib.ReportSDKException: Unexpected database connector error---- Error code:-2147467259 Error code name:failed at com.businessobjects.reports.sdk.JRCCommunicationAdapter.a(Unknown Source)at com.businessobjects.reports.sdk.JRCCommunicationAdapter.request(Unknown Source)at com.crystaldecisions.proxy.remoteagent.x.a(Unknown Source)at com.crystaldecisions.proxy.remoteagent.q.a(Unknown Source)at com.crystaldecisions.sdk.occa.report.application.dd.a(Unknown Source)at com.crystaldecisions.sdk.occa.report.application.ag.a(Unknown Source)at com.crystaldecisions.sdk.occa.report.application.av.if(Unknown Source)at com.crystaldecisions.sdk.occa.report.application.an.new(Unknown Source)at com.crystaldecisions.sdk.occa.report.application.cb.for(Unknown Source)at com.crystaldecisions.proxy.remoteagent.u.performDo(Unknown Source)at com.crystaldecisions.proxy.remoteagent.u.a(Unknown Source)at com.crystaldecisions.sdk.occa.report.application.DatabaseController.a(Unknown Source)at com.crystaldecisions.sdk.occa.report.application.DatabaseController.setTableLocation(Unknown Source)at com.crystaldecisions.reports.sdk.DatabaseController.setTableLocation(Unknown Source)at com.businessobjects.samples.JRCHelperSample.changeDataSource(JRCHelperSample.java:787) at northnetwork.report.CrystalReportEngine.createReportDocument(CrystalReportEngine.java:56)at northnetwork.report.CrystalReportEngine.<init>(CrystalReportEngine.java:40) at org.apache.jsp.parameter.viewReport_jsp._jspService(viewReport_jsp.java:77)at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97) at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:334) at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264) at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869) at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664)at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527) at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684) at java.lang.Thread.run(Unknown Source)Caused by: com.crystaldecisions.reports.reportdefinition.datainterface.e: Unexpected database connector errorat com.crystaldecisions.reports.reportdefinition.datainterface.a.a(Unknown Source)at com.crystaldecisions.reports.reportdefinition.datainterface.a.a(Unknown Source)at com.crystaldecisions.reports.reportdefinition.datainterface.a.a(Unknown Source)at com.crystaldecisions.reports.reportdefinition.datainterface.g.a(Unknown Source)at com.crystaldecisions.reports.dataengine.bj.new(Unknown Source)at com.crystaldecisions.reports.common.as.a(Unknown Source)at com.crystaldecisions.reports.common.ae.a(Unknown Source)at com.businessobjects.reports.sdk.b.k.a(Unknown Source)at com.businessobjects.reports.sdk.b.w.m(Unknown Source)... 37 moreCaused by: com.crystaldecisions.reports.queryengine.am: Unexpected database connector errorat com.crystaldecisions.reports.queryengine.driverImpl.o.if(Unknown Source)at com.crystaldecisions.reports.queryengine.ax.new(Unknown Source)at com.crystaldecisions.reports.queryengine.ax.byte(Unknown Source)... 46 moreCaused bycom.crystaldecisions.reports.reportdefinition.datainterface.e: Unexpected database connector errorat com.crystaldecisions.reports.reportdefinition.datainterface.a.a(Unknown Source)at com.crystaldecisions.reports.reportdefinition.datainterface.a.a(Unknown Source)at com.crystaldecisions.reports.reportdefinition.datainterface.a.a(Unknown Source)at com.crystaldecisions.reports.reportdefinition.datainterface.g.a(Unknown Source)at com.crystaldecisions.reports.dataengine.bj.new(Unknown Source)at com.crystaldecisions.reports.common.as.a(Unknown Source)at com.crystaldecisions.reports.common.ae.a(Unknown Source)at com.businessobjects.reports.sdk.b.k.a(Unknown Source)at com.businessobjects.reports.sdk.b.w.m(Unknown Source)at com.businessobjects.reports.sdk.JRCCommunicationAdapter.request(Unknown Source)at com.crystaldecisions.proxy.remoteagent.x.a(Unknown Source)at com.crystaldecisions.proxy.remoteagent.q.a(Unknown Source)at com.crystaldecisions.sdk.occa.report.application.dd.a(Unknown Source)at com.crystaldecisions.sdk.occa.report.application.ag.a(Unknown Source)at com.crystaldecisions.sdk.occa.report.application.av.if(Unknown Source)at com.crystaldecisions.sdk.occa.report.application.an.new(Unknown Source)at com.crystaldecisions.sdk.occa.report.application.cb.for(Unknown Source)at com.crystaldecisions.proxy.remoteagent.u.performDo(Unknown Source)at com.crystaldecisions.proxy.remoteagent.u.a(Unknown Source)at com.crystaldecisions.sdk.occa.report.application.DatabaseController.a(Unknown Source)at com.crystaldecisions.sdk.occa.report.application.DatabaseController.setTableLocation(Unknown Source)at com.crystaldecisions.reports.sdk.DatabaseController.setTableLocation(Unknown Source)at com.businessobjects.samples.JRCHelperSample.changeDataSource(JRCHelperSample.java:787) at northnetwork.report.CrystalReportEngine.createReportDocument(CrystalReportEngine.java:56)at northnetwork.report.CrystalReportEngine.<init>(CrystalReportEngine.java:40) at org.apache.jsp.parameter.viewReport_jsp._jspService(viewReport_jsp.java:77)at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97) at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:334) at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264) at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869) at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664)at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527) at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684) at java.lang.Thread.run(Unknown Source)Caused by: com.crystaldecisions.reports.queryengine.am: Unexpected database connector errorat com.crystaldecisions.reports.queryengine.driverImpl.o.if(Unknown Source)at com.crystaldecisions.reports.queryengine.ax.new(Unknown Source)at com.crystaldecisions.reports.queryengine.ax.byte(Unknown Source)... 46 moreCaused by:com.crystaldecisions.reports.reportdefinition.datainterface.e: Unexpected database connector errorat com.crystaldecisions.reports.reportdefinition.datainterface.a.a(Unknown Source)at com.crystaldecisions.reports.reportdefinition.datainterface.a.a(Unknown Source)at com.crystaldecisions.reports.reportdefinition.datainterface.a.a(Unknown Source)at com.crystaldecisions.reports.reportdefinition.datainterface.g.a(Unknown Source)at com.crystaldecisions.reports.dataengine.bj.new(Unknown Source)at com.crystaldecisions.reports.common.as.a(Unknown Source)at com.crystaldecisions.reports.common.ae.a(Unknown Source)at com.businessobjects.reports.sdk.b.k.a(Unknown Source)at com.businessobjects.reports.sdk.b.w.m(Unknown Source)at com.businessobjects.reports.sdk.JRCCommunicationAdapter.request(Unknown Source)at com.crystaldecisions.proxy.remoteagent.x.a(Unknown Source)at com.crystaldecisions.proxy.remoteagent.q.a(Unknown Source)at com.crystaldecisions.sdk.occa.report.application.dd.a(Unknown Source)at com.crystaldecisions.sdk.occa.report.application.ag.a(Unknown Source)at com.crystaldecisions.sdk.occa.report.application.av.if(Unknown Source)at com.crystaldecisions.sdk.occa.report.application.an.new(Unknown Source)at com.crystaldecisions.sdk.occa.report.application.cb.for(Unknown Source)at com.crystaldecisions.proxy.remoteagent.u.performDo(Unknown Source)at com.crystaldecisions.proxy.remoteagent.u.a(Unknown Source)at com.crystaldecisions.sdk.occa.report.application.DatabaseController.a(Unknown Source)at com.crystaldecisions.sdk.occa.report.application.DatabaseController.setTableLocation(Unknown Source)at com.crystaldecisions.reports.sdk.DatabaseController.setTableLocation(Unknown Source)at com.businessobjects.samples.JRCHelperSample.changeDataSource(JRCHelperSample.java:787) at northnetwork.report.CrystalReportEngine.createReportDocument(CrystalReportEngine.java:56)at northnetwork.report.CrystalReportEngine.<init>(CrystalReportEngine.java:40) at org.apache.jsp.parameter.viewReport_jsp._jspService(viewReport_jsp.java:77)at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97) at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:334) at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264) at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869) at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664)at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527) at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684) at java.lang.Thread.run(Unknown Source)Caused by: com.crystaldecisions.reports.queryengine.am: Unexpected database connector errorat com.crystaldecisions.reports.queryengine.driverImpl.o.if(Unknown Source)at com.crystaldecisions.reports.queryengine.ax.new(Unknown Source)at com.crystaldecisions.reports.queryengine.ax.byte(Unknown Source)... 46 more

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when I select the OLE DB provider is "microsoft OLE DB provider for
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thank you in advance!
[email protected]

ebarker wrote in message news:<[email protected]>...
> Please look at the
> href="http://www.ni.com/pdf/manuals/321525c.pdf">LabVIEW Database
> Connectivity User Manual, specifically chaper 2, as it explains in
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> Good luck!
I have saw LabVIEW Database Connectivity User Manual,I can't get some
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when I select the OLE DB provider is "microsoft OLE DB provider for
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--------------------------------------------------------------------------------------

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If I add a new asp JavaScript page
Don't. You are not using ASP/JavaScript. Use ASP/VBScript.
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Message was edited by:
dakger

So your suggestion is to use a static method from a
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@nclow - I will work on trying the Factory Pattern for this over the weekend and post when I finish to see what you think.
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Thx, Grantarchy
Edited by: grantarchy on May 9, 2008 9:50 PM

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[/CODE]
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(ADDRESS=
(PROTOCOL=TCP)
(Host=172.31.xx.xx)
(Port=1526)
(CONNECT_DATA=
(SID=MARS)
I don't know where the tnsname.ora file is supposed to be located or how to reference it from .asp or anything like that though. The only database connection experience I have is with my own access databases, but none trying to connect to someone elses oracle db. Any help at all or a link to some kind of starters guide would be much appreciated. Also, I downloaded pl/sql developer, but I cannot log on to that either. I don't know if its the same connection issue here, but I know my user/pass for the server is correct, what do I enter for database, so that the application knows where to go? Thanks again... -ST

objConnect.Open ("Provider=MSDASQL;DRIVER={Microsoft
t ODBC for
Oracle};Server=F12_PROD_MARS.WORLD;UID=FLGI;PWD=FLGI")I take it you have the Oracle Client installed on the web app server i.e. where the MS ODBC driver lives
ODBC now looks for tns name "f12_prod_mars.world" ...
Which gives me the "ORA-12154: TNS:could not resolve service name" error.
I know the information that I need in my tnsname.ora file is:
F12_PROD_MARS =
... because it looks for that name, including .world, and cant find it. Name "f12_prod_mars" is not the same name, obviously. (like test.com and test.se are different)
I don't know where the tnsname.ora file is supposed
to be located or how to reference it from .asp orWhere is it located now? If you search the harddrives for tnsnames.ora, what do you get?
connection issue here, but I know my user/pass for
the server is correct, what do I enter for database,
so that the application knows where to go? ThanksIf an app, like sql*plus, is asking for "Database:" it often means you give the tns name (=the alias for the tns connect descriptor, which is the thing with lots of ('s and )'s) :)
Message was edited by:
orafad

Question regarding Database Connection.

Normally, after we open a database connection, we could use the Connection.close() method to close and return database connection back to a connection pool.
What would happen if I nullify the connection without using the close() method to close a database connection?
Would the database connection automatically close after I nullify it?
If not, how the connection going to return back to the connection pool?

The connection will close/be released automatically when the garbage collector runs, but you should NEVER rely on that because you never know when the GC will run or if it will collect all objects or only part of them. Best approach is to always have a finally block where you close/release the connection.
Alin.

Performance with MySQL and Database connectivity toolbox

Hi!
I'm having quite some problems with the performance of MySQL and Database connectivity toolbox. However, I'm very happy with the ease of using database connectivity toolbox. The background is:
I have 61 variables (ints and floats) which I would like to save in the MySQL-database. This is no problem, however, the loop time increases from 8ms to 50ms when using the database. I have concluded that it has to do with the DB Tools Insert Data.vi and I think that I have some kind of performance issue with this VI. The CPU never reach more the 15% of its maximum performance. I use a default setup and connect through ODBC.
My questions are:
1. I would like to save 61 variables each 8-10ms, is this impossible using this solution?
2. Is there any way of increasing the performance of the DB Tools Insert Data.vi or use any other VI?
3. Is there any way of adjusting the MySQL setup to achieve better performance?
Thank you very much for your time.
Regards,
Mattias

First of all, thank you very much for your time. All of you have been really good support to me.
>> Is your database on a different computer? Does your loop execute 61 times?
Database is on the same computer as the MySQL server.
The loop saves 61 values at once to the database, in one SQL-statement.
I have now added the front panel and block diagram for my test-VI. I have implemented the queue system and separate loops for producer and consumer. However, since the queue is building up faster then the consumer loop consumes values, the queue is building up quite fast and the disc starts working.
The test database table that I add data to is created by a simple:
create table test(aa int, bb char(15));
...I'm sure that this can be improved in some way.
I always open and close the connection to the database "outside the loop". However, it still takes some 40-50 ms to save the data to the database table - so, unfortunatly no progress to far. I currently just want to save the data.
Any more advise will be gratefully accepted.
Regards,
Mattias
Message Edited by mattias@hv on 10-23-2007 07:50 AM
Attachments:
front panel 2.JPG ‏101 KB
block diagram.JPG ‏135 KB

Database Connection Problem in Oracle9i Lite Web-to-Go

Hi
I am having problem in the Database Connectivity. I am using the OracleDriver class for the connection and have defined the DataSource in the struts-config.xml as
<data-sources>
<data-source>
<set-property property="driverClass"
value="oracle.jdbc.driver.OracleDriver" />
<set-property property="url"
value="jdbc:oracle:thin:@192.50.200.201:1521:WEBTOGO.WORLD" />
<set-property property="maxCount"
value="5"/>
<set-property property="minCount"
value="1"/>
<set-property property="user"
value="master"/>
<set-property property="password"
value="ramchow"/>
</data-source>
</data-sources>
But when I am trying to do any database transaction it is throwing the following exception..
log9: [ERROR] ActionServlet - -Initializing application data source org.apache.s
truts.action.DATA_SOURCE <java.sql.SQLException: Io exception: Connection refuse
d(DESCRIPTION=(TMP=)(VSNNUM=153093120)(ERR=12505)(ERROR_STACK=(ERROR=(CODE=12505
)(EMFI=4))))>java.sql.SQLException: Io exception: Connection refused(DESCRIPTION
=(TMP=)(VSNNUM=153093120)(ERR=12505)(ERROR_STACK=(ERROR=(CODE=12505)(EMFI=4))))
at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:180)
at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:222)
at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:335)
at oracle.jdbc.driver.OracleConnection.<init>(OracleConnection.java:361)
at oracle.jdbc.driver.OracleDriver.getConnectionInstance(OracleDriver.ja
va:442)
at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:321)
at org.apache.struts.legacy.GenericDataSource.createConnection(GenericDa
taSource.java:805)
at org.apache.struts.legacy.GenericDataSource.open(GenericDataSource.jav
a:741)
at org.apache.struts.action.ActionServlet.initModuleDataSources(ActionSe
rvlet.java:1085)
at org.apache.struts.action.ActionServlet.init(ActionServlet.java:472)
at javax.servlet.GenericServlet.init(GenericServlet.java:258)
at oracle.lite.web.JupServlet.createInstance(JupServlet.java:349)
at oracle.lite.web.JupServlet.getServlet(JupServlet.java:322)
at oracle.lite.web.JupServlet.service(JupServlet.java:216)
at oracle.lite.web.AppServletHandler.handle(AppServletHandler.java:297)
at oracle.lite.web.JupApplication.service(JupApplication.java:550)
at oracle.lite.web.JupHandler.handle(JupHandler.java:109)
at oracle.lite.web.HTTPServer.process(HTTPServer.java:306)
at oracle.lite.web.HTTPServer.handleRequest(HTTPServer.java:162)
at oracle.lite.web.JupServer.handle(JupServer.java:310)
at oracle.lite.web.SocketListener.process(SocketListener.java:172)
at oracle.lite.web.SocketListener$ReqHandler.run(SocketListener.java:226
log9: javax.servlet.UnavailableException: Initializing application data source o
rg.apache.struts.action.DATA_SOURCE
log9: at org.apache.struts.action.ActionServlet.initModuleDataSources(ActionSe
rvlet.java:1091)
log9: at org.apache.struts.action.ActionServlet.init(ActionServlet.java:472)
log9: at javax.servlet.GenericServlet.init(GenericServlet.java:258)
log9: at oracle.lite.web.JupServlet.createInstance(JupServlet.java:349)
log9: at oracle.lite.web.JupServlet.getServlet(JupServlet.java:322)
log9: at oracle.lite.web.JupServlet.service(JupServlet.java:216)
log9: at oracle.lite.web.AppServletHandler.handle(AppServletHandler.java:297)
log9: at oracle.lite.web.JupApplication.service(JupApplication.java:550)
log9: at oracle.lite.web.JupHandler.handle(JupHandler.java:109)
log9: at oracle.lite.web.HTTPServer.process(HTTPServer.java:306)
log9: at oracle.lite.web.HTTPServer.handleRequest(HTTPServer.java:162)
log9: at oracle.lite.web.JupServer.handle(JupServer.java:310)
log9: at oracle.lite.web.SocketListener.process(SocketListener.java:172)
log9: at oracle.lite.web.SocketListener$ReqHandler.run(SocketListener.java:226.
Can anybody guide me what can be the problem asap.
regards
ramchow

Ramesh,
This looks like it might be a Java class mismatch error. Do you have multiple versions of Java installed on your machine? If so, you may want to keep one version and remove the rest.
If you're already running just one version, you may want to check the registry and classpath for references to multiple Java versions, or version that no longer exist.
Please let me know if you have additional questions.
Junius

How can I use SQL TOOLKIT concurrently with Database Connectivity ?

I have installed LabVIEW 6.1 with the Database Connectivity Toolkit and the SQL Compatibility Toolkit (e.g. _SQL folder). I am trying to make the transition from the SQL Toolkit VIs to the Database Connectivity toolkits, but for compatability with existing systems I would like to be able to run the two sets of VIs concurrently (but not in the same app).
When I read into 6.1 a connection VI that I wrote with LabVIEW 6.0 and the SQL toolkit the connection reference type gets changed from a number to type connection (see attachments) . Does compatbility mean that my SQL toolkit VIs are converted to a form compatible with the new ADO ?
Can I use the SQL Toolkit VIs or the Database connectivit
y VIs in the same installation of 6.1 ?
Can I have the SQL Toolkit VIs appear on the functions pallette and function as they did when only the SQL toolkit was installed ?
Attachments:
CNNCT.vi ‏20 KB
CNNCT.vi ‏22 KB

In response to your #2 below:
Actually it is possible to have the old SQL Toolkit and new Database
connectivity in the same installation of LabVIEW. I have only tried it on
6i, but don't see why it wouldn't work on 6.1. The trick is not to install
the SQL toolkit compatabitily VI's. The old SQL toolkit uses the Intersolve
dll through ODBC while the new Database connectivity uses ADO so it is
possible to use both methods not only in the same LabVIEW install, but it
the same running application. It has been a while since I originally did
this, so I am posting only to mention that it is possible and not exactly
how to do it. If anyone is interested in more details just respond.
Brian
"Jeff B" wrote in message
news:[email protected]...
> First, direct answers to your direct questions:
>
> 1. Does compatbility mean that my SQL toolkit VIs are converted to a
> form compatible with the new ADO ?
>
> Yes
>
> 2. Can I use the SQL Toolkit VIs or the Database connectivity VIs in
> the same installation of 6.1 ?
>
> No
>
> 3. Can I have the SQL Toolkit VIs appear on the functions pallette
> and function as they did when only the SQL toolkit was installed ?
>
> No
>
>
> Now an elaboration:
>
> Having the old SQL Toolkit and the new Database Connectivity Toolset
> installed on the same version of LabVIEW on the same computer is not
> supported.
>
> Once you install the Database Connectivity Toolset, any VIs written
> with the SQL Toolkit will run, but with the ADO layer, as you
> suspected.
>
> Internally, the only way we can have both the SQL Toolkit and the
> Database Connectivity Toolset installed on the same computer for
> troubleshooting customer issues is to have them installed on different
> versions of LabVIEW. I, for example, have LabVIEW 5.1.2, 6.0.3, and
> 6.1 all installed on my computer, and I have the SQL Toolkit install
> on LabVIEW 5.1.2, and the Database Connectivity Toolset installed on
> LabVIEW 6.0.3. In this configuration I can still run SQL Toolkit VIs
> independent of the Database Connectivity Toolset if I open and run
> them in LabVIEW 5.1.2.

Multiple DB connection question.

I have a MDB that currently processes a message and updates a Oracle DB say Database A. Now we want that MDB to check some flags on a different Oracle database instance, say Database B before it updates the Database A.
Basically, the during the processing of a message the MDB has to access Database A, Database B and Database A again in that order. My question is whatever I am trying to do is reccommended? Since I need connection to Database A again after I do some woek with Database B, can I still keep that connection around or do I have to close that right away?
I am using wls 8.1.
Any suggestions?
Thanks
JB

The short answer is that you can keep both connections around at the same time, without any issues. Just be careful with any cleanup where you close connections, and make sure that both get dealt with regardless of any exceptions that might occur.
But depending on the number of MDBs in your configured pool, it might be a more efficient use of database connections to create a smaller pool of stateless session beans to hold those database connections and expose utility methods for the queries (which could use prepared statements)
Kevin Powe 
Senior Consultant
Message was edited by:
kevinpowe

Multiple Database Servers Question

Hi,
Please forgive this ignorant question, but can someone tell
me how one would go about using multiple database servers?
Just as there comes a time where one would need more than
one web server and would need to use a load balancing
solution, what happens when one would need more than one
Database Server?
How does one go about implementing that solution?
Is there some way to have two database servers carrying the
same information with some kind of load balancing solution
in front of it(?) or does one place some tables on one
Database
server, and other tables on the other database server?
(I have no clue as to how things would work.)
Thanks in advance,
Joe

Microsoft SQL allows for clustering of SQL databases, so for
instance two servers connected to a fileshare and a virtual address
shared across the two physical boxes. Database connections are made
to the virtual addres which will then be handled by the active
node. Becuase a database is ultimately a file(s) on a disk it can
only be attached to one node at a time so you end up with an
active/inactive cluster.

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