About database connections

what is better and why .. making the DB connections in the run time or in the compile time?
thanks in advance

Belal wrote:
what is better and why .. making the DB connections in the run time or in the compile time?
thanks in advanceI have no idea what you mean.
How do you mean making the DB connection in compile time?

Similar Messages

Some problems about database connection

I am working on oracle9i. The problem is that I have to specify the "host string" in the login window of SQL*PLUS to connect to database (I can't use the command-line GUI). But I don't know how to specify "Host String" in JDBC connection string and SQL*Loader.
Can anybody help me?

Chen, please state specifically where you are trying to run each of these application from and where the database is.
Since you mentioned a SQLPlus window then it sounds like you are running from a client PC to a remote Oracle installation. If this is true you normally use the connect string alias set up in the local tnsnames.ora file to connect to the remote db. You set this up as part of the client install or using the Net Configuration Assistent or some shops provide one common file on the network referenced by the TNS_ADMIN OS environment variable.
For batch or command line usage
sqlldr userid@service_name
sqlplus userid@servie_name
HTH -- Mark D Powell --

A problem about database connection

What's the advantages and disadvantages of create each JDBC connection in the jspInit ( ) and close it in jspDestroy ( ) for every JSP script compare with from the connection pool.
THANKS
Edited by: Cryil on Nov 14, 2007 11:21 PM

jiju wrote:
The container calls the jspInit() to initialize te servlet instance.
and is called only once for a servlet instance.
so if we are opening JDBC conection in JspInit(), we will get only one connection.
for the subsequent requests we have to use this single connection, results in starvation.
where as in the case of connection pool ,we will get a pool of connections when the container starts
we can make use of any of these available connections when we receive multiple requests.You can, normally, have multiple statements on the same connection, and since a JSP should only be reading (never updating) there won't be any (what I like to call) "commit cross-overs", so this is not "in principal" a problem.
It would not, however, be ultimately practical. And the practice (a single connection per Servlet/Jsp) is still not one I would reccommend, for any reason.

Urgent ...about database connectivity,,

this is the code i am intending to use in vb6 project
Provider=OraOLEDB.Oracle.1;Password=pratik;Persist Security Info=True;User ID=system;datasource=?
what datasource should i give if i ve created table using sql+ 9i?
where is the table saved?

this is the code i am intending to use in vb6
project
Provider=OraOLEDB.Oracle.1;Password=pratik;Persist
Security Info=True;User ID=system;datasource=?
what datasource should i give if i ve created tableusing sql+ 9i?
where is the table saved?
Nothing is urgent on a forum of volunteers .....
I'm not familiar with coding to Oracle in VB, but I'd guess the datasource would either be a DSN defined to your ODBC, or else the same tnsnames service name you used when you connected with SQL*Plus.
Why are you using the SYSTEM account? That's generally Not A Good Thing for normal application work.

Query about multiple connection pools under one database

Hi,
I have s query about connection pool, now we have a requirement,
we have two schemas in one db, some data store in one schema, some in another schema,
all tables are the same, but data is different, we want to retrive all data under two schemas,
so we need two connection pools under one database,
I have set two system DSN, and each connection pool was mapping to one DSN,
but after I importing tables into RPD, when I view data, there is a dialog let me select connection pool. so If this, when we drag columns in answer, it will definitely get wrong.
so how to realize this function about multiple connection pools under one database and we can get data normally.

Hi,
Try this step
1)Better to create two different DSN for the same database with different user id and password
2)now create multiple connection pool in the same database in u r RPD physical layer .
also refer this link : for imporving performance
http://obiee101.blogspot.com/2009/01/obiee-multiple-connection-pools.html
http://gerardnico.com/wiki/dat/obiee/connection_pool
Thanks
Deva

Questions about the database connection

hi all,
I am developing a project with JDeveloper 10g and I created a database connection to my Oracle RAC database.
However, whenever I start the project with the JDeveloper and I do a "netstat -an" with the command prompt window. I show there are over 100 connection ESTABLISHED to my database. I don't have any idea how this happens. The problem is since there are over 100 connection established, I couldn't run the project with the JDeveloper's embedded OC4J.
Can anyone help me to fix this problem?

I have set the Max connections to 30 in the connection-pool setting of my project in the Embedded OC4J Server Preferences, but it doesn't work.
There are still over 100 connections to the database...

A strang problem about Resin database connection pool

I am a beginner，hope somebody can help me.
my web site occured a strange problem after I used the Resin database connection pool instead of
connecting directly
the error message as follows:java.lang.IllegalArgumentException: Request cannot be null
at javax.servlet.ServletRequestWrapper.<init>(ServletRequestWrapper.java:100)
at javax.servlet.http.HttpServletRequestWrapper.<init>(HttpServletRequestWrapper.java:92)
at com.caucho.server.connection.RequestAdapter.<init>(RequestAdapter.java:96)
at com.caucho.server.webapp.DispatchRequest.<init>(DispatchRequest.java:97)
at com.caucho.server.webapp.IncludeDispatchRequest.<init>(IncludeDispatchRequest.java:77)
at com.caucho.server.webapp.IncludeDispatchRequest.createDispatch(IncludeDispatchRequest.java:87)
at com.caucho.server.webapp.RequestDispatcherImpl.include(RequestDispatcherImpl.java:389)
at com.caucho.server.webapp.RequestDispatcherImpl.include(RequestDispatcherImpl.java:345)
at com.caucho.jsp.PageContextImpl.include(PageContextImpl.java:807)
at _jsp._intro__jsp._jspService(/intro.jsp:60)
at com.caucho.jsp.JavaPage.service(JavaPage.java:75)
at com.caucho.jsp.Page.pageservice(Page.java:571)
at com.caucho.server.dispatch.PageFilterChain.doFilter(PageFilterChain.java:155)
at com.caucho.server.cache.CacheFilterChain.doFilter(CacheFilterChain.java:211)
at com.caucho.server.webapp.WebAppFilterChain.doFilter(WebAppFilterChain.java:177)
at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:221)
at com.caucho.server.http.HttpRequest.handleRequest(HttpRequest.java:263)
at com.caucho.server.port.TcpConnection.run(TcpConnection.java:331)
at com.caucho.util.ThreadPool.runTasks(ThreadPool.java:464)
at com.caucho.util.ThreadPool.run(ThreadPool.java:408)
at java.lang.Thread.run(Thread.java:595)


<resin xmlns="http://caucho.com/ns/resin"
xmlns:resin="http://caucho.com/ns/resin/core">

<log name='' level='info' path='stdout:' timestamp='[%H:%M:%S.%s] '/>
<log name='com.caucho.java' level='config' path='stdout:'
timestamp='[%H:%M:%S.%s] '/>
<log name='com.caucho.loader' level='config' path='stdout:'
timestamp='[%H:%M:%S.%s] '/>

<dependency-check-interval>2s</dependency-check-interval>

<javac compiler="internal" args=""/>



<thread-pool>

<thread-max>128</thread-max>

<spare-thread-min>25</spare-thread-min>
</thread-pool>

<min-free-memory>1M</min-free-memory>
<server>

<class-loader>
<tree-loader path="$resin-home/lib"/>
</class-loader>

<keepalive-max>500</keepalive-max>
<keepalive-timeout>120s</keepalive-timeout>

<http server-id="" host="*" port="8080"/>


<cluster>
<srun server-id="" host="127.0.0.1" port="6802" index="1"/>
</cluster>

<ignore-client-disconnect>true</ignore-client-disconnect>

<cache path="cache" memory-size="10M"/>

<ping>

</ping>

<web-app-default>

<cache-mapping url-pattern="/" expires="5s"/>
<cache-mapping url-pattern="*.gif" expires="60s"/>
<cache-mapping url-pattern="*.jpg" expires="60s"/>

<servlet servlet-name="directory"
servlet-class="com.caucho.servlets.DirectoryServlet"/>
</web-app-default>

<database>
<jndi-name>jdbc/artunion</jndi-name>
<driver type="org.gjt.mm.mysql.Driver">
<url>jdbc:mysql://localhost:3306/union</url>
<user>as</user>
<password>as</password>
</driver>
<prepared-statement-cache-size>8</prepared-statement-cache-size>
<max-connections>20</max-connections>
<max-idle-time>30s</max-idle-time>
</database>

<host-default>
<class-loader>
<compiling-loader path='webapps/WEB-INF/classes'/>
<library-loader path='webapps/WEB-INF/lib'/>
</class-loader>

<access-log path='logs/access.log'
format='%h %l %u %t "%r" %s %b "%{Referer}i" "%{User-Agent}i"'
rollover-period='1W'/>

<web-app-deploy path='webapps'/>

<ear-deploy path='deploy'>
<ear-default>

</ear-default>
</ear-deploy>

<resource-deploy path='deploy'/>

<web-app-deploy path='deploy'/>
</host-default>

<resin:import path="${resinHome}/conf/app-default.xml"/>

<host id=''>
<document-directory>D:/artunion</document-directory>

<web-app id='/'>

<class-loader>
<simple-loader path="$host-root/xsl"/>
</class-loader>
<servlet-mapping url-pattern="/servlet/*" servlet-name="invoker"/>
</web-app>
</host>
</server>
</resin>
Thank you!

Deploy form, question about database object or connection parameters

When form to be deployed to the dev/test/production environment, should it be compiled with that specific database connection username, password and sid? Another words, when I compile the database objects created for the compile is embedded in the .fmx file?
thanks for help

You won't need to compile your forms if the passwords of the target schema differs. It also doesn't matter on what platform/architecture the database server runs on. However it would matter how you created your schema objects. And of course it will matter if the platform your forms run on differ. The list of "what you need to do when you don't want to compile against the target database" is a long one.
Here is a short list of don'ts
- no +select * from [...]+ views
- no +select * from [...]+ in forms cursors and the like
- %TYPE is evil
- %ROWTYPE is much more evil
Those are just a few obvious things developers can mess up. Of course we all know that this sort of things are bad programming practice but they do happen. And as said: that's just the most obvious things. I work for a vendor where only the compiled files are shipped to the customer, and the road to this goal is a hard and bumpy one. If you don't want bad surprises in production I suggest you implement a fixed build process routine and a fixed upgrade process where you can ensure that the target database where the forms run against match exactly the development database you compile your forms from a logical point of view. The far easier exit is to just compile your forms on the target platform against the target database but I understand that this is not always possible.
cheers

Problem with database connection in Jdev 11

Hello,
my jdev version is 11 and i want do really simple task create new database connection to my oracle db.
I open database navigator and click new connection. i want jdbc connection but after i fill this form i pressed test connection button and get this error msg:
Test failed: 4
i think i have correct information but i tried this, i opened my older jdev 10 and copy jdbc url from my old db connection.
In jdev 11 i checked Enter Custom JDBS Url and pasted url from jdev 10 and i get:
Test failed: 4
What is wrong?
Thanks for your advice.
J.

I add new information:
i cant connect to oracle db 8, but i try another db in my company which is 10 and its working fine.
I write java class and try connect to db 8 via jdbc manually:
String url = "jdbc:oracle:thin:@SERVER:1525:SID";
String user = "user1";
String password = "aaa";
Class.forName("oracle.jdbc.driver.OracleDriver");
// DriverManager.registerDriver (new oracle.jdbc.driver.OracleDriver());
Connection conn = DriverManager.getConnection(url, user, password);
and i get this:
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 4
     at oracle.jdbc.driver.T4C8TTIdty.marshal(T4C8TTIdty.java:468)
     at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:339)
     at oracle.jdbc.driver.PhysicalConnection.<init>(PhysicalConnection.java:621)
     at oracle.jdbc.driver.T4CConnection.<init>(T4CConnection.java:203)
     at oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtension.java:34)
     at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:501)
     at java.sql.DriverManager.getConnection(DriverManager.java:525)
     at java.sql.DriverManager.getConnection(DriverManager.java:171)
     at project1.Class1.main(Class1.java:31)
i hope this will be more usefull and i know i write this info about db's version little bit late.
J.

Creating new Data Source Error - Database connection Failed

Successfully installed and configured 11.1.1.3.0. Planning and Essbase dev.
Went to Workspace > Administer > Classing Planning Administration > Manage Data Sources > Create Data Source.
Entered all info about the application database , etc. Getting error "The database connection failed" (I was able to connect with no problem during the install)
SQL server 2005 is on the same physical server.
The diagnostic tool shows database connection passed for planning. A new database was created for the new application.
The server event viewer shows these errors.
"Login failed for user 'xxx-hyperion'. The user is not associated with a trusted SQL Server connection."
Group Policy Error "The client-side extension could not apply computer policy settings for 'Default Domain Policy {xxx}' because it failed with error code '0x80070003 The system cannot find the path specified.' See trace file for more details. "
The Group Policy client-side extension Group Policy Services failed to execute. Please look for any errors reported earlier by that extension.
Any help is appreciated.

Datasource for the application.
I have created a sql db for this planning application (my datasource). See my first message for more details.
When you create a new planning application, you need to associate it with a data source. Since this is a new install, I don't have any data sources available yet.
So, "To create, edit or delete data sources, click Manage Data Source."
This page lets you validate your connection to the database and essbase server. My essbase server connection validates! The database connection does not validate after I enter all the relevant information.
SCREEN INFO BELOW
Fields displayed with an asterisk (*) are mandatory.
Data Source Name *:
Data Source Description:
Select Database Platform
Microsoft SQL Server
Application Database
Server * :
Port * :
Database *:
User *:
Password *:
Click "Validate Database Connection"
ERROR ---> Database connection failed.
So it does not let me create a data source for my new planning application, so I cannot create a new planning application.
Thanks in advance.

A database connection in a swing application

hi ,
i am developping an intranet stabdalone swing application based on a jdbc connection to oracle8i data server.
in fact i am interested in keeping my user authentification encrypted while this connection is done! is there any method to do it ! i read about SSL but is it supported by web application ! i have a client-server simple connection !
please help !

Hello Levi,
You can to do this form:
String appModule = "yourAppmodule";
String config = "yourAppmodule"+ "Local";
ApplicationModule am = Configuration.createRootApplicationModule(appModule, config);
ConnectionMetada cm = am.getTransaction().getConnectionMetadata();
DriverManager.registerDriver(new OracleDriver());
Connection connection = DriverManager.getConnection(cm.getJdbcURL());You can to see this threads:
Retrieve Database Connection
Getting the Connection object out of ApplicationModule
Regards,
Renan

Open and close database connection jsp page

hi there, i wanna know about how to open database connection to Mysql at the beginning of the page and close the connection at the end of the page. The jsp page contain all processing code.
plz help me...thx thx

<html>
<head>
<basefont face="Arial">
</head>
<body>
<%@ page language="java" import="java.sql.*" %>
<%!
// define variables
String id;
String firstName;
String lastName;
// define database parameters, change this according to your needs
String host="localhost";
String user="root";
String pass="";
String db="test";
String conn;
%>
<table border="1" cellspacing="1" cellpadding="5">
<tr>
<td><b>id</b></td>
<td><b>first name</b></td>
<td><b>last name</b></td>
</tr>
<%
Class.forName("org.gjt.mm.mysql.Driver");
// create connection string
conn = "jdbc:mysql://" + host + "/" + db + "?user=" + user
+ "&password=" + pass;
// pass database parameters to JDBC driver
Connection Conn = DriverManager.getConnection(conn);
// query statement
Statement SQLStatement = Conn.createStatement();
// generate query
// change this query according to your needs
String Query = "SELECT id, firstname, lastname FROM abook";
// get result
ResultSet SQLResult = SQLStatement.executeQuery(Query);
while(SQLResult.next())
   id = SQLResult.getString("id");
   firstName = SQLResult.getString("firstname");
   lastName = SQLResult.getString("lastname");
        out.println("<tr><td>" + id + "</td><td>" +
     firstName + "</td><td>" + lastName + "</td></tr>");
// close connection
SQLResult.close();
SQLStatement.close();
Conn.close();
%>
</table>
</body>
</html>hi :-)
i've got that on the net as part of the tutorial on jsp (long long time ago)
you just have to be resourceful in finding solutions :-)
try google :-) there are lot's of tutorial available in there ;-)
goodluck ;-)
regards,

Unable to open database connection after applicaiton is running for several days.

Has anyone experienced a similar error to this:
After about 3 days of use our application starts to report errors opening
the database connection. By that time we've had thousands of transactions
happen. Oracle is only showing a few open connections to our iAS host so
the error seems to indicate the connection pool. I'm configured for 64
connections (the default). We are using the Oracle native driver on iAS
SP3, Solaris.
The iAS ksvradmin monitor gives errors when trying to see how many open
connections it has (verified bug in SP3), so I can't get any info from iAS
on the connection pool.
Thanks in advance,
Rodger Ball
Sr. Engineer
Business Wire

iAS6 SP3 and earlier cannot detect dead connections. If connections become
stale, iAS does not detect this and will hand out these stale connections.
I don't know enough about your problem, but you can check for this.
hope this helps,
-James
"Rodger Ball" <[email protected]> wrote in message
news:9suucb$[email protected]..
Has anyone experienced a similar error to this:
After about 3 days of use our application starts to report errors opening
the database connection. By that time we've had thousands of transactions
happen. Oracle is only showing a few open connections to our iAS host so
the error seems to indicate the connection pool. I'm configured for 64
connections (the default). We are using the Oracle native driver on iAS
SP3, Solaris.
The iAS ksvradmin monitor gives errors when trying to see how many open
connections it has (verified bug in SP3), so I can't get any info from iAS
on the connection pool.
Thanks in advance,
Rodger Ball
Sr. Engineer
Business Wire

Regarding web analysis database connections

Hi All,
I have couple of web analysis reports and the issue is i have copied this web analysis server to another server
where i have the same application. Now iam trying to append those database connection properties of the file to
point to the new server.
I have altered by selecting the user>database>select database>rightclick>edit>changed properties
But when i open the report it popping out with my old server details.
Does any one have idea about how to change database properties for a report.
Thanks,
Ram

Hi Manoj,
I have created a DSN but how can i point the report to that DSN and run the same report as of my report running on my old server.
Thanks,
Ram

Database connection in EJB

Hi,
I am using a method for validating Userid and Password in a Session Bean. I could deploy and run it without any errors but the return value is null. The same bean If I am using with <JSP:usebean> tag the return value is correct. That means the database connection is OK. I am giving the code below.
public String validate(String UId,String PWd)throws RemoteException {
try{
DriverManager.registerDriver(new oracle.jdbc.driver.OracleDriver());
conn = DriverManager.getConnection("jdbc:oracle:oci8:scott/tiger@Everest");
st = conn.createStatement();
String str = "select * from T_CRM_WRK_LCTN where LOGINID='"+UId+"'";
ResultSet rs = st.executeQuery(str);
while(rs.next()){
login = (String) rs.getString("LOGINID");
if(login.equals(UId)){
pass = (String) rs.getString("PASSWORD");
break;
if( (UId.equals(login)) && (PWd.equals(pass)))
flg="Y";
else
flg="N";
st.close();
conn.close();
}catch(Exception e){}
return flg;
Can anyone help me what is the problem. Thanks in advance.
Mallik
null

Hi,
Extension to the above problem, the problem is with the Connection. It is not able to establish the connection. Can anyone advise me about the possible reasons.
Mallik

About database connections

Similar Messages

Maybe you are looking for