Basic connection to database

Hello all
I want to connect my Java code with a database which contents UserID, password and host name. But I don't know how to set a driver name and how to use Tomcat. I use MySQL to create the database. Sorry I have just started with Java for 1 month so there are a lot of thing I dont know. Could you explain clearly. Thank you all very much.

Learning how to connect to databases and using Tomcat are two very different things. Rather than swallow the whole problem at once, see if you can make a POJO connect to a database first. Then learn how to deploy a servlet in Tomcat. Once you master both of those you can write a servlet that will instantiate your already-working POJO database object and you're done.

Similar Messages

How to connect Oracle database into Visual basic 6.0

Hi. I am using Oracle I Enterprise version 9.2.0.1, I have a problem for connecting oracle database into VB. I use a ODBC to connect oracle database with VB. By testing connection. Message tells me that "connection successfully", but I can not have a record display in VB. It tells me that can not publish a connection with ODBC. Please tell me why

Are you using the Oracle ODBC driver? If so, which version?
Are you writing your own VB application? What API are you using-- ADO? Can you post the code that's making a connection and the exact text of the error message?
Justin

Taking too much time (1min) to connect to database

Hi,
I have oracle 10.2 and 10g application server.
Its taking too much time to connect to database through application (on browser). The connection through sqlplus is fine.
Please share your experience.
Regards,
Naseer

Dear AnaTech,
i am going to ask not related this question which already you answered i am going to ask you about that how to connect forms6i and Developer 10g with OracleAS.
i have installed and working Developer Suite 10g Ver. 10.1.2 and also Form Builder 6i. On my other machine i installed and working Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 and also on the database machine i installed Oracle Enterprise Manager 10g Application Server Control 10.1.2.0.2.
my database conectivity with Developer suite Forms and Reports and also Form6i and Reports6i are working fine. no problem.
now the 1 question of mine is that when i try to run form6i through run from web i got this error. FRM-99999: error 18121 occured see the release not.
this and the main question of mine is this that how can i control my OracleAS 10g with forms because basically the functionality of OracleAS is Mid-Tier but i am not utilizing the Mid-tier i am using here Two-tier Envrionment even i installed 3-Tier Environment so tell me how i utilize it with 3-Tier..
I hope you don't mind that i ask this question here and also if you give me you email then we can discuss this in detail and i can be helpful of your great expertise. i also know and utilize my 3-tier real envrionment.
Waiting for your great response.
Regards,
K.J.J.C

How to connect Oracle database from Active Server page

Hi
This is srinivas aluri
I have developed an application using ASP and MS-SQL7.
Now i want to port this application to Oracle 8i database
I have written my connection in seperate file called
connection.inc using SQL OLEDB provider
If i have to connect oracle database what will be my provider
and what is the exact code for this connection string
Here i am giving the code of SQL databse connection string
strcon= Provider=SQLOLEDB.1;Persist Security Info=False;User
ID=sa;Initial Catalog=prjdb;Data Source=servername
i have tried by changing the provider name from SQLOLEDB.1 to
OraOLEDB.oracle
but i could not able connect the database.
It is giving provider not found or not properly installed error.
But the same code is perfectly working from Visual Basic code.

it depends on configuration your going to choose, there are two ways--
- Using X/Open standards, for this
you have to make an entry of Resource manager in $TUXDIR/udataobj/RM file.
Then in UBBConfig file in GROUPS section u have to set Openinfo.
It also depend on which database you are going to use.
In your service now you need to call tpopen() API from tpsvrinit() function.
- Other possibility is, take an implicit connection using Pro*C or Pro*Cobol whatever platform you are using.
EXEC SQL Connect ...

How to connect oracle database into VC?GIve step by step.

Hi Experts,
Please help
How to connect oracle database into VC?
I need step by step.
what shall i do the first to connect via jdbc or something else.
whether we have to create dsn name or using jdbc connections?which one to use?
Please give the basic steps.Its very urgent.
Thanks and Regards,
Nutan

Hi ,
all information are in the following document:
<a href="https://www.sdn.sap.comhttp://www.sdn.sap.comhttp://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/6209b52e-0401-0010-6a9f-d40ec3a09424">How to Configure a Business Intelligence JDBC System for Visual Composer</a>
Rgds,
Karim

How to connect sql database with Flash

Dear Friends,
Iam working on a quessinarie (assesment) for elearning software. i want to connect sql database with flash and save my records in back end like add, delete, modification of student result and details.
Kindly help me to connect the sql database. or dot net server. I know how to connect PHP and mysql. But my client dont want php. only sql database and do the add, del, modificaiton.
Thanks in advance,
Syed Abdul Rahim

unfortunately no, i do not know ASP well enough to give any code advice, other than the basic concept: make a request on a server-side script (such as ASP) via URLLoader - the script receives variable values (if required), runs the DB queries you wish to invoke, and 'returns' the results - pick them up in the URLVariables class via the event handler in Flash and assign them to local properties if needed, etc.
there are quite a few threads that you could find more specific information on the ASP side, here and elsewhere around the net.

Connection to database takes a considerable amount of time

Hi,
This is basically an IDS 10g thing. Same issue in Reports
1. Whenever I connect to Oracle 10g by pressing CTRL J, it takes like 4-5 mins to connect to Oracle. This only happens once till I close down Forms 10g and reopen it.
2. A related thing, I cannot FILE-OPEN any .fmb file till I first connect to database, or else I just get one of those windows errors (not responding) and the form builder crashes.
Environment:
1. Windows 7 x64 and x86
2. Windows 8 x64
3. Connecting to Oracle 10g.
i7 processor 8gb ram, plenty of hard drive space.
Why does this happen, how do I fix it?
Edited by: Asim Siddiqui on May 23, 2013 3:16 AM
Edited by: Asim Siddiqui on May 23, 2013 3:17 AM

Asim Siddiqui wrote:
1. Windows 7 x64 and x86Did you install the required patches for this platform?
cheers

Can you have two connections to database

I am running two java programs which access the same database. One runs forever, and keeps the same connection up. The other program, lets say does a simple update, but it stalls and will never do the update. If I kill the first programs connection, then the second program can do the update. I am using the jdbc thin client. Is there a way I can have these both run and not stall?

The short answer is, yes.
There are two general approaches to the problem. The first approach is to use various locking, commit and rollback techniques. The basic premise is that if program A runs into a problem, the database drops A and reverts back to the previous state before responding to program B. This is highly dependent upon the database you're actually using, and probably beyond the scope of this forum.
The second approach is to code your programs with a philosophy of "get in, do it, get out" as quickly as possible. In other words, do NOT leave a database connection open if you can avoid it.
Essentially your program makes a connection, does a select query, copies the results into a data structure you define, and exits. Then you're free to play with the results as you see fit. When the time comes to do an update, you make the connection, perform the update, then immediately exit. If you need to test it, make another connection, do a select on that record, copy it, close the connection, then compare the copy with what you anticipate.
There is the added benefit that whenever you close the connection, most databases will then do whatever commits need to be done, and release any deadlocks that may be in place.
Your problem isn't really that your database cannot do two connections - its the fact that your database does not want to let two separate people make changes to the same table at the same time. There's an obvious reason for it and we can go into more detail if you want.
But essentially, if you do each transaction as quickly as possible, and let the database clean up after each transaction, you will avoid most, if not all of the problems you're experiencing.
Don't worry about the overhead of creating and closing connections. If it does become a problem, you can always use a "Connection Pool" (search for it on the forums if you want to know more). You just don't want to be in a position where the database is saying "I can't give you the info you want because I don't know if this other program is going to change any of it before giving control back to me."

Code to connect to database in Webdynpro-- iviews

Hi All-
Could you let me know the code to connect to database
in WebDynPro-->iviews.
Regards,
Cris

Hi,
Here are the two ways of connecting to a database through coding:
////1////
Class.forName("com.microsoft.jdbc.sqlserver.SQLServerDriver");
java.sql.Connection conn= java.sql.DriverManager.getConnection("jdbc:microsoft:sqlserver://<IP>:<port>;user=<abc>;password=<xyz>;database=<DB name>");
////2////
InitialContext initialContext = new InitialContext();
DataSource dataSource = (DataSource)initialContext.lookup("jdbc/SRI");
java.sql.Connection conn = dataSource.getConnection();
Regards
Srinivasan T

How to find the number of users connected to database from OS level(Linux)

Hi All,
Could anyone know , how to find the number of users connected to database without connecting with sql*plus
is there any command to find it?
example we have 10 databases in one server, how to find the number of users connected to particular database without connecting to database(v$session)?
oracle version:- 10g,11g
Operating System:- OEL4/OEL5/AIX/Solaris
any help will be appreciated.
Thanks in advance.
Thank you.
Regards,
Rajesh.

Excellent.
Tested, works as long as you set the ORACLE_SID first ( to change databases )
ps -ef | grep $ORACLE_SID | grep "LOCAL=NO" | awk '{print $2}' | wc -l
Thanks!
select OSUSER
from V$SESSION
where AUDSID = SYS_CONTEXT('userenv','sessionid')
and rownum=1;Best Regards
mseberg

I am not able to connect to database in sql developer.how to do?

I downloaded sqldeveloper 1.5.4.59.40. iam not able to establish connection to database. Can anyone tell me ?

Have you created a database (or have one you connect to)?
Have you created the Net Service connections for SQL Developer to use?
Does SQL Developer have access to this Net Serviice name?
Have you created the connections from SQL Developer?
Can you post an error message?
See
<br>
Oracle Database FAQs
</br>

Managed Server can not connect to Database

I have a WebLogic cluster with three managed Server on 3 different machines.
ManagedServer_1, ManagedServer_2, ManagedServer_3 (on Machine 3)
Firstly, everything is ok. But when we changed some configuration on Firewall and make the WebLogic cluster could not connect to database. 3 servers change status from Running to Warning. Then, we undo all the changes to the Firewall configuration. 3 Servers could connect to Database again but still in warning state.
It is strange that when I tried to restart ManagedServer_3. That server could not be up normally. It went to Admin state and all the datasources and connection pool could not be created. I tried to restart the machine 3 and start the server but it still failed to make server running normally.
( I made the test connecting to Database from Machine 3, everything is okie, I can got data from database, port 1521 opened )
Has anyone got the same problem and how to fix it? Is that the problem with the admin server?

JDBC DataSources/Connection pools are all at Domain Level. All we do is just target the datasources to AdminServer and Entire cluster (this will take care of all managed servers in the cluster). From Weblogic Console, TEST the data sources for any firewall issues. If this works from console, check from where you are accessing the Console like within the Firewall, that can access the database server. Even though the actual application is deployed only on cluster, still I would recommend targetting the datasources to both AdminServer and Cluster.
Ravi Jegga

MySQL Database Connection (two databases at the same time)

I have never had to open more than one MySQL database from within the same website before, but I do now. The website I have is designed where all the content comes from within the main database. I am building an Inventory system that I want within it's own database, in the event I would ever need to move the application to another server or something, I don't want this data residing in the main database.
Currently, I open the database connection from within a file called "common.php" that resides in a directory called "lib" that can be accessed from the root directory. Below is the proposed code that would be placed within the "common.php" file:
// Define Database Variables
$dbserver = "127.0.0.1";
$dbuser = array('clevelan_user1', 'clevelan_user2');
$dbpass = array('P@ssw0rd', 'P@ssw0rd2');
$dbname = array('clevelan_database1', 'clevelan_database2');
// Start Session
session_start();
// Connect to Databases
connectdb($dbserver, $dbuser[0], $dbpass[0], $dbname[0]);
connectdb2($dbserver, $dbuser[1], $dbpass[1], $dbname[1]);
// Database 1 Connection
function connectdb($dbserver, $dbuser, $dbpass, $dbname) {
// connects to db
global $connection;
$connection = @mysql_connect($dbserver, $dbuser, $dbpass) or die ("could not connect to server");
$db = @mysql_select_db($dbname, $connection) or die ("could not select databsase");
return $connection;
// Database 2 Connection
function connectdb2($dbserver, $dbuser, $dbpass, $dbname) {
// connects to db
global $connection2;
$connection2 = @mysql_connect($dbserver, $dbuser, $dbpass) or die ("could not connect to server");
$db2 = @mysql_select_db($dbname, $connection2) or die ("could not select databsase");
return $connection2;
//End of Code Within the "common.php"
From within any page of the website, I want to access both connections by placing an include at the top of each page:
include_once("lib/common.php");
Currently, when I run the code above, any page within the website (the home page) provides error messages with regards to database connectivity (the pages are looking for there content from within the second database. It's as if the second database is the only database seen by the website.
I need help figuring out how I can have two MySQL databases open at the same time (the second database will only be open for short periods of time and then closed). But the main database is always open.

Create one project using one copy of the exact tables.
create 2 different sessions.xml files each pointing to the same project. Set the login information in the sessions.xml files.
That should work fine.
Peter

Enterprise manager is not able to connect to database instance

Hi
I am having a problem with Oracle EM. I would appreciate very much if anyone can help me.
I installed Oracle on XP which runs on virtual pc on XP as well. Everything is fine, I can connect to database with sqlplus, and there were no errors during installation.
But the problem is that, when I try to connect to database with EM, it says:
Enterprise manager is not able to connect to database instance . The state of the components are listed below.
Can anoyone help me?

user10637311 wrote:
When you want OEM DB , your existing DB should be created by DBCA or if suppose manually creaed DB then you have to configure that DB to EM by
"emca -config dbcontrol db -repos create". for these two cases istener should be running.
emctl start dbconsole -> to start dbconsole service
emctl status dbconsole-> status of servicesI am sorry, I was looking at $ORACLE_HOME\admin . And in the proper path, both listener.ora and tnsnames.ora do exist.
emca -config dbcontrol db -repos create :
<last part>:
INFO: This operation is being logged at C:\oracle\product\10.2.0\db_1\cfgtoollog
s\emca\orcl\emca_2010-02-18_02-01-40-AM.log.
Feb 18, 2010 2:02:46 AM oracle.sysman.emcp.util.DBControlUtil stopOMS
INFO: Stopping Database Control (this may take a while) ...
Feb 18, 2010 2:03:19 AM oracle.sysman.emcp.EMReposConfig createRepository
INFO: Creating the EM repository (this may take a while) ...
Feb 18, 2010 2:03:19 AM oracle.sysman.emcp.EMReposConfig invoke
SEVERE: Error creating the repository
Feb 18, 2010 2:03:19 AM oracle.sysman.emcp.EMReposConfig invoke
INFO: Refer to the log file at C:\oracle\product\10.2.0\db_1\cfgtoollogs\emca\or
cl\emca_repos_create_<date>.log for more details.
Feb 18, 2010 2:03:19 AM oracle.sysman.emcp.EMConfig perform
SEVERE: Error creating the repository
Refer to the log file at C:\oracle\product\10.2.0\db_1\cfgtoollogs\emca\orcl\emc
a_2010-02-18_02-01-40-AM.log for more details.
Could not complete the configuration. Refer to the log file at C:\oracle\product
\10.2.0\db_1\cfgtoollogs\emca\orcl\emca_2010-02-18_02-01-40-AM.log for more deta
ils.
C:\oracle\product\10.2.0\db_1\cfgtoollogs\emca\or
cl\emca_repos_create_<date>.log:
Check if repos user already exists.
old 6: WHERE username=UPPER('&EM_REPOS_USER');
new 6: WHERE username=UPPER('SYSMAN');
old 8: IF ( '&EM_CHECK_TYPE' = 'EXISTS') THEN
new 8: IF ( 'NOT_EXISTS' = 'EXISTS') THEN
old 11: raise_application_error(-20000, '&EM_REPOS_USER does not exists..');
new 11: raise_application_error(-20000, 'SYSMAN does not exists..');
old 14: ELSIF ( '&EM_CHECK_TYPE' = 'NOT_EXISTS' ) THEN
new 14: ELSIF ( 'NOT_EXISTS' = 'NOT_EXISTS' ) THEN
old 17: raise_application_error(-20001, '&EM_REPOS_USER already exists..');
new 17: raise_application_error(-20001, 'SYSMAN already exists..');
old 21: raise_application_error(-20002, 'Invalid Check type &EM_CHECK_TYPE');
new 21: raise_application_error(-20002, 'Invalid Check type NOT_EXISTS');
DECLARE
ERROR at line 1:
ORA-20001: SYSMAN already exists..
ORA-06512: at line 17

Error Connecting to database URL jdbc:oracle:oci:@rmsdbtst as user rms13 java.lang.Exception:UnsatisfiedLinkError encountered when using the Oracle driver

Trying to Install RMS application 13.2.2 and I get past the pre-installation checks and when I get to the Data Source details and enter the data source details with the check box checked to validate the schema/Test Data Source I get the following error:
Error Connecting to database URL jdbc:oracle:oci:@rmsdbtst as user rms13 java.lang.Exception:UnsatisfiedLinkError encountered when using the Oracle driver. Please check that the library path is set up properly or switch to the JDBC thin client oracle/jdbc/driver/T2CConnection.getLibraryVersioNumber()
Checks performed:
RMS Application code location and directory contents:
[oracle@test-rms-app application]$ pwd
/binary_files/STAGING_DIR/rms/application
[oracle@test-rms-app application]$ ls -ltr
total 144
-rw-r--r-- 1 oracle oinstall   272 Dec 7 2010 version.properties
-rw-r--r-- 1 oracle oinstall   405 Jan 16 2011 expected-object-counts.properties
-rw-r--r-- 1 oracle oinstall   892 May 13 2011 ant.install.properties.sample
-rw-r--r-- 1 oracle oinstall 64004 Jun 6 2011 build.xml
drwxr-xr-x 9 oracle oinstall 4096 Jun 16 2011 rms13
drwxr-xr-x 3 oracle oinstall 4096 Jun 16 2011 installer-resources
drwxr-xr-x 3 oracle oinstall 4096 Jun 16 2011 antinstall
drwxr-xr-x 2 oracle oinstall 4096 Jun 16 2011 ant-ext
drwxr-xr-x 5 oracle oinstall 4096 Jun 16 2011 ant
-rw-r--r-- 1 oracle oinstall 11324 Dec 18 09:18 antinstall-config.xml.ORIG
-rwxr-xr-x 1 oracle oinstall 4249 Dec 18 10:01 install.sh
drwxr-xr-x 4 oracle oinstall 4096 Dec 18 10:06 common
-rw-r--r-- 1 oracle oinstall 16244 Dec 19 10:37 antinstall-config.xml
-rw-r--r-- 1 oracle oinstall   689 Dec 19 10:37 ant.install.log
[oracle@test-rms-app application]$
Application installation:
[oracle@test-rms-app application]$ ./install.sh
THIS IS the driver directory
Verified $ORACLE_SID.
Verified SQL*Plus exists.
Verified write permissions.
Verified formsweb.cfg read permissions.
Verified Registry.dat read permissions.
Verified Java version 1.4.2.x or greater. Java version - 1.6.0
Verified Tk2Motif.rgb settings.
Verified frmcmp_batch.sh status.
WARNING: Oracle Enterprise Linux not detected. Some components may not install properly.
Verified $DISPLAY - 172.16.129.82:0.0.
This installer will ask for your "My Oracle Support" credentials.
Preparing installer. This may take a few moments.
Your internet connection type is: NONE
Integrating My Oracle Support into the product installer workflow...
     [move] Moving 1 file to /binary_files/STAGING_DIR/rms/application
Installer preparation complete.
MW_HOME=/u01/app/oracle/Middleware/NewMiddleware1034
ORACLE_HOME=/u01/app/oracle/Middleware/NewMiddleware1034/as_1
ORACLE_INSTANCE=/u01/app/oracle/Middleware/NewMiddleware1034/asinst_1
DOMAIN_HOME=/u01/app/oracle/Middleware/NewMiddleware1034/user_projects/domains/rmsClassDomain
WLS_INSTANCE=WLS_FORMS
ORACLE_SID=rmsdbtst
JAVA_HOME=/u01/app/oracle/jrockit-jdk1.6.0_45-R28.2.7-4.1.0
Launching installer...
To make sure I have connectivity from the app server to the database (on a database server) here are the steps followed:
[oracle@test-rms-app application]$ tnsping rmsdbtst
TNS Ping Utility for Linux: Version 11.1.0.7.0 - Production on 19-DEC-2013 10:41:40
Copyright (c) 1997, 2008, Oracle. All rights reserved.
Used parameter files:
Used TNSNAMES adapter to resolve the alias
Attempting to contact (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = test-rms-db.vonmaur.vmc)(PORT = 1521)) (CONNECT_DATA = (SERVER = DEDICATED) (SID = rmsdbtst)))
OK (0 msec)
[oracle@test-rms-app application]$
[oracle@test-rms-app application]$ sqlplus rms13@rmsdbtst
SQL*Plus: Release 11.1.0.7.0 - Production on Thu Dec 19 10:46:18 2013
Copyright (c) 1982, 2008, Oracle. All rights reserved.
Enter password:
Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
SQL> exit
Disconnected from Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
[oracle@test-rms-app application]$
[oracle@test-rms-app application]$ ping test-rms-db
PING test-rms-db.vonmaur.vmc (192.168.1.140) 56(84) bytes of data.
64 bytes from test-rms-db.vonmaur.vmc (192.168.1.140): icmp_seq=1 ttl=64 time=0.599 ms
64 bytes from test-rms-db.vonmaur.vmc (192.168.1.140): icmp_seq=2 ttl=64 time=0.168 ms
64 bytes from test-rms-db.vonmaur.vmc (192.168.1.140): icmp_seq=3 ttl=64 time=0.132 ms
64 bytes from test-rms-db.vonmaur.vmc (192.168.1.140): icmp_seq=4 ttl=64 time=0.158 ms
64 bytes from test-rms-db.vonmaur.vmc (192.168.1.140): icmp_seq=5 ttl=64 time=0.135 ms
--- test-rms-db.vonmaur.vmc ping statistics ---
5 packets transmitted, 5 received, 0% packet loss, time 4001ms
rtt min/avg/max/mdev = 0.132/0.238/0.599/0.181 ms
[oracle@test-rms-app application]$
[oracle@test-rms-app application]$ uname -a
Linux test-rms-app.vonmaur.vmc 2.6.18-128.el5 #1 SMP Wed Jan 21 08:45:05 EST 2009 x86_64 x86_64 x86_64 GNU/Linux
[oracle@test-rms-app application]$
[oracle@test-rms-app application]$ cat /etc/*-release
Enterprise Linux Enterprise Linux Server release 5.3 (Carthage)
Red Hat Enterprise Linux Server release 5.3 (Tikanga)
[oracle@test-rms-app application]$
The database is created and all the batch file scripts have been successfully deployed. Now working on the application server. The Weblogic server is installed and 11g forms and reports are installed successfully.
Any help would be helpful.
Thanks,
Ram.

Please check MOS Notes:
FAQ: RWMS 13.2 Installation and Configuration (Doc ID 1307639.1)

Basic connection to database

Similar Messages

Maybe you are looking for