Connecting Two database
I have two Database. One the master databse is Oracle 7.3 and another Oracle 8.06. Now i want to update a field in Oracle 8.06 from Oracle 7.3. These updation also has to be done for the new records created. How i can do.
May be using create database link!
Similar Messages
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I want to connect two database in Oracle
Dear All
I want to connect two database in Oracle ver-10.2.0.1.0 ,And fetch data from 2nd table.
OS - XP Pro.
Regards,
ParwezConfigure remote DB in TNS first.
Create DB link.
CREATE {PUBLIC} DATABASE LINK "DBLINKNAME" CONNECT TO "remoteuser" IDENTIFIED BY "remotepwd" USING 'REMOTEDBTNSALIAS';Query remote tables using
select * from remotetable@DBLINKNAME; -
Generate query at a time & connect two database ?
Hi
Could u help me? it is necessary that
I have two database ( RSHPL,RSPL) and both data base have same table name and same fieldname (Table Name :-OITM, Fieldname :ONHAND ,pk- ITEMcode,)
At first I tell u what I want?
I want to generate query at a time & connect two database and same table name(OITM) to select the TOTAL VALUE of this field(ONHAND) and pk-key is Itemcode.
Is it Possible? If Possible plz write this query and send me.Hi,
I don't think its possible to write a query from within SAP that allows you to get data from another SAP database.
I have used SQL Reporting Services to report on data from multiple databases, and this works very well for many of my clients. It depends on what you want to do with the data, do you need to display it on the screen in SAP and it to a field or will a report suffice?
Regards,
Adrian -
How do we connect two databases in Oracle other than Database Link?
Good Morning,
How do we connect two databases in Oracle other than Database Link?
I am using Oracle 10g, I heard that we can connect two database in Oracle through ODBC. Is it possible? How?
Thanks
NiharSee if this helps.
http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:4406709207206#18830681837358 -
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 -
Connect two database in runtime
I have a application, which will set the JDBC connection once the tomcat load. Then i can get the connection each time. But there are another function in the application, which will insert some data into another database. But I don't know how to load two database connection once the tomcat load or switch to another database base. Thanks for you help.
In the context.xml. the current setting as belows
<?xml version="1.0" encoding="UTF-8"?>
<Context reloadable="true" path="/">
<Resource auth="Container"
driverClassName="oracle.jdbc.OracleDriver"
maxActive="15"
maxIdle="60"
maxWait="8000"
name="jdbc/dbdatasource"
username="xxx"
password="xxx"
type="javax.sql.DataSource"
url="jdbc:oracle:thin:@(DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.100.1)(PORT = 1521))(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.100.2(PORT = 1521))(LOAD_BALANCE = yes))(CONNECT_DATA =(SERVICE_NAME = toc)))"/>
</Context>
And when the application get connection, will use the following coding.
db = new DBAccess(this.getClass());
public DBAccess(Class sInClass) throws Exception{
sCallerClassName = sInClass.getName();
connectDB();
private void connectDB() throws Exception{
String sDbName;
String sDbUser;
String sDbPasswd;
try {
Context initCtx = new InitialContext();
Context envCtx = (Context) initCtx.lookup("java:comp/env");
DataSource ds = (DataSource) envCtx.lookup("jdbc/dbdatasource");
this.oCon = ds.getConnection();
oSystemLog.debug(" ----- Class " + sCallerClassName + " connection started ----- ");
} catch (Exception e) {
oSystemLog.error("",e);
throw e;
}Configure another Resource entry with a different JNDI name (yours is called "jdbc/dbdatasource") in Tomcat and create a corresponding mapping in your web application's deployment descriptor (the web.xml file).
-
Hibernate query...how to connect two databases...
hi i m new to hibernate..
i created two tables..
1st table is catalog:
2nd table is acctinfo
//HBM file is :
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="hibernate.example.Catalog" table="catalog">
<id name="id" type="integer" column="ID">
<generator class="increment"/>
</id>
<property name="journal" type="string" column="JOURNAL"/>
<property name="publisher" type="string" column="PUBLISHER"/>
<property name="edition" type="string" column="EDITION"/>
<property name="title" type="string" column="TITLE"/>
<property name="author" type="string" column="AUTHOR"/>
<bag name="accinfo" cascade="all" >
<key column="ID"/>
<one-to-many class="hibernate.example.Acctinfo"/>
</bag>
</class>
<class name="hibernate.example.Acctinfo" table="acctinfo">
<id name="id" type="integer" column="ID">
<generator class="increment"/>
</id>
<property name="account" type="string" column="ACCOUNT"/>
<property name="password" type="string" column="PASSWORD"/>
<property name="balance" type="string" column="BALANCE"/>
</class>
</hibernate-mapping>
///******************getter setter file is::****************
package hibernate.example;
public class Acctinfo
int id;
String account;
String password;
String balance;
public Acctinfo()
public void setId(int id)
this.id = id;
public int getId()
return id;
public void setAccount(String account)
this.account = account;
public void setPassword(String password)
this.password = password;
public void setBalance(String balance)
this.balance = balance;
public String getAccount()
return account;
public String getBalance()
return balance;
public String getPassword()
return password;
//********************2nd getter setter file is:***********************
package hibernate.example;
import java.util.List;
public class Catalog
int id;
String journal;
String publisher;
String edition;
String title;
String author;
private List accinfo;
public Catalog()
public void setId(int id)
this.id = id;
public int getId()
return id;
public void setJournal(String journal)
this.journal = journal;
public String getJournal()
return journal;
public void setPublisher(String publisher)
this.publisher = publisher;
public String getPublisher()
return publisher;
public void setEdition(String edition)
this.edition = edition;
public String getEdition()
return edition;
public void setTitle(String title)
this.title = title;
public String getTitle()
return title;
public void setAuthor(String author)
this.author = author;
public String getAuthor()
return author;
public void setAccinfo(List accinfo)
this.accinfo = accinfo;
public List getAccinfo()
return accinfo;
* To change this template, choose Tools | Templates
* and open the template in the editor.
package hibernate.example;
import hibernate.example.Acctinfo;
import hibernate.example.Catalog;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.ListIterator;
import org.hibernate.Query;
import org.hibernate.SQLQuery;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
public class CatalogClient
Session session = null;
SessionFactory sessionFactory = new Configuration().configure().buildSessionFactory();
public static void main(String str[])
CatalogClient clc = new CatalogClient();
//clc.saveData();
//clc.deleteData();
//clc.showData();
clc.updateData();
public void showData()
try
session =sessionFactory.openSession();
String SQL_QUERY ="select id, journal, publisher, edition, title, author from catalog";
// String SQL_QUERY ="select c.ID, c.JOURNAL, c.PUBLISHER, c.EDITION, c.TITLE, c.AUTHOR, a.ACCOUNT, a.PASSWORD,a.BALANCE from catalog c, ACCTINFO a where c.ID = a.ID";
SQLQuery query = session.createSQLQuery(SQL_QUERY);
System.out.println("*** query : *** "+ query);
//for(ListIterator it=query.list().listIterator();it.hasNext();)
for (ListIterator lit = query.list().listIterator(); lit.hasNext();)
Object[] row = (Object[]) lit.next();
/*System.out.println("ID: " + row[0]);
System.out.println("Title: " + row[1]);
System.out.println("Author: " + row[2]);
System.out.println("Isbn: " + row[3]);
System.out.println("Pages: " + row[4]);
System.out.println("Copyright: " + row[5]);
System.out.println("Cost: " + row[6]);
System.out.println("******NEXT****************");
Object[] row = (Object[]) it.next();*/
System.out.println("ID: " + row[0]);
System.out.println("JOURNAL: " + row[1]);
System.out.println("PUBLISHER: " + row[2]);
System.out.println("EDITION: " + row[3]);
System.out.println("TITLE: " + row[4]);
System.out.println("AUTHOR: " + row[5]);
System.out.println("acc: " + row[6]);
System.out.println("pass: " + row[7]);
System.out.println("bal: " + row[8]);
System.out.println("***************************");
session.close();
catch(Exception e)
System.out.println(e.getMessage());
public void saveData()
session =sessionFactory.openSession();
Transaction transaction = null;
transaction = session.beginTransaction();
Catalog catalog = setBean();
//System.out.println("before save");
session.save(catalog);
//System.out.println("after save");
transaction.commit();
session.flush();
session.close();
public void updateData()
session =sessionFactory.openSession();
Catalog catalog = new Catalog();
catalog.setId(2);
catalog.setAuthor("manoj");
catalog.setJournal("java");
catalog.setEdition("1st");
catalog.setPublisher("indiabulls");
catalog.setTitle("java Servlet");
session.update(catalog);
session.flush();
session.close();
public void deleteData()
session =sessionFactory.openSession();
Catalog catalog = new Catalog();
catalog.setId(3);
session.delete(catalog);
session.flush();
session.close();
public static Catalog setBean()
Acctinfo accinfo = new Acctinfo();
accinfo.setAccount("MANOJ1");
accinfo.setPassword("orbis");
accinfo.setBalance("1000");
List list = new ArrayList();
list.add(accinfo);
Catalog catalog = new Catalog();
catalog.setJournal("india");
catalog.setPublisher("indiabulls");
catalog.setEdition("ist");
catalog.setTitle("orbis");
catalog.setAuthor("manoj");
catalog.setAccinfo(list);
return catalog;
//********************CFG FILE IS ******************
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory name="session">
<property name="hibernate.dialect">org.hibernate.dialect.Oracle9Dialect</property>
<property name="hibernate.connection.driver_class">oracle.jdbc.driver.OracleDriver</property>
<property name="hibernate.connection.url">jdbc:oracle:thin:@172.16.31.25:1521:BOMBAY</property>
<property name="hibernate.connection.username">mumbai</property>
<property name="hibernate.connection.password">mumbai123</property>
<!-- Set AutoCommit to true -->
<property name="connection.autocommit">true</property>
<property name="dialect">org.hibernate.dialect.OracleDialect</property>
<!-- Mapping files -->
<mapping resource="Catalog.hbm.xml"/>
</session-factory>
</hibernate-configuration>
**********************error i m facing is :************************
0 [main] WARN net.sf.ehcache.config.Configurator - No configuration found. Configuring ehcache from ehcache-failsafe.xml found in the classpath: jar:file:/C:/Documents%20and%20Settings/d.poonam/Desktop/hibernate/lib/ehcache-1.1.jar!/ehcache-failsafe.xml
1188 [main] WARN org.hibernate.impl.SessionFactoryObjectFactory - Could not bind factory to JNDI
javax.naming.NoInitialContextException: Need to specify class name in environment or system property, or as an applet parameter, or in an application resource file: java.naming.factory.initial
at javax.naming.spi.NamingManager.getInitialContext(Unknown Source)
at javax.naming.InitialContext.getDefaultInitCtx(Unknown Source)
at javax.naming.InitialContext.getURLOrDefaultInitCtx(Unknown Source)
at javax.naming.InitialContext.getNameParser(Unknown Source)
at org.hibernate.util.NamingHelper.bind(NamingHelper.java:52)
at org.hibernate.impl.SessionFactoryObjectFactory.addInstance(SessionFactoryObjectFactory.java:90)
at org.hibernate.impl.SessionFactoryImpl.<init>(SessionFactoryImpl.java:247)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1043)
at hibernate.example.CatalogClient.<init>(CatalogClient.java:24)
at hibernate.example.CatalogClient.main(CatalogClient.java:27)
please help me out....
thanks in advance..
if u know how to connect two tables plz let me know..
its urgent....I made this work with MySQL. Adapt to your situation as needed. - %
package hibernate.model;
import hibernate.util.HibernateUtils;
import hibernate.model.Catalog;
import hibernate.model.Account;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.hibernate.Session;
import hibernate.util.HibernateUtils;
import static junit.framework.Assert.assertEquals;
import static junit.framework.Assert.assertNotNull;
public class CatalogTest
private static final Log LOGGER = LogFactory.getLog(CatalogTest.class);
public static void main(String[] args)
Session session = null;
try
session = HibernateUtils.getSessionFactory().getCurrentSession();
session.beginTransaction();
int rowsBefore = HibernateUtils.getRowCount(session, Catalog.class);
assertEquals("should not have any Catalogs", rowsBefore, 0);
Catalog catalog = new Catalog("test title");
catalog.addAccount(new Account(100));
catalog.addAccount(new Account(200));
Long id = (Long) session.save(catalog);
assertNotNull("generated id should not be null", id);
LOGGER.info("returned id: " + id);
session.getTransaction().commit();
LOGGER.debug("transaction committed");
catch (Exception e)
LOGGER.error(e);
session.getTransaction().rollback();
package hibernate.model;
import java.io.Serializable;
import java.text.NumberFormat;
public class Account implements Serializable
private Long id;
private int balance;
public Account()
this(null, 0);
public Account(int balance)
this(null, balance);
public Account(Long id, int balance)
this.id = id;
this.balance = balance;
public Long getId()
return id;
private void setId(Long id)
this.id = id;
public int getBalance()
return balance;
private void setBalance(int balance)
this.balance = balance;
public boolean equals(Object o)
if (this == o)
return true;
if (!(o instanceof Account))
return false;
Account account = (Account) o;
return !(id != null ? !id.equals(account.id) : account.id != null);
public int hashCode()
int result;
result = (id != null ? id.hashCode() : 0);
result = 31 * result + balance;
return result;
public String toString()
return new StringBuilder().append("Account{").append("id=").append(id).append(", balance=").append(NumberFormat.getCurrencyInstance().format(balance)).append('}').toString();
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="hibernate.model" default-access="field" default-lazy="true">
<class name="Account" table="accounts">
<id name="id" column="account_id">
<generator class="native"/>
</id>
<property name="balance" column="balance"/>
</class>
</hibernate-mapping>
package hibernate.model;
import java.io.Serializable;
import java.util.Set;
import java.util.HashSet;
import java.util.Collections;
public class Catalog implements Serializable
private Long id;
private String title;
private Set<Account> accounts;
public Catalog()
this(null, "", Collections.EMPTY_SET);
public Catalog(String title)
this(null, title, Collections.EMPTY_SET);
public Catalog(Long id, String title, Set<Account> accounts)
this.id = id;
this.title = title;
this.accounts = new HashSet<Account>(accounts);
public Long getId()
return id;
private void setId(Long id)
this.id = id;
public String getTitle()
return title;
private void setTitle(String title)
this.title = title;
public Set<Account> getAccounts()
return accounts;
private void setAccounts(Set<Account> accounts)
this.accounts = accounts;
public void addAccount(Account account)
this.getAccounts().add(account);
public void removeAccount(Account account)
this.getAccounts().remove(account);
public boolean equals(Object o)
if (this == o)
return true;
if (!(o instanceof Catalog))
return false;
Catalog catalog = (Catalog) o;
return !(id != null ? !id.equals(catalog.id) : catalog.id != null);
public int hashCode()
return (id != null ? id.hashCode() : 0);
public String toString()
return new StringBuilder().append("Catalog{").append("id=").append(id).append(", title='").append(title).append('\'').append(", accounts=").append(accounts).append('}').toString();
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="hibernate.model" default-access="field" default-lazy="true">
<class name="Catalog" table="catalogs">
<id name="id" column="catalog_id">
<generator class="native"/>
</id>
<property name="title" column="title"/>
<set name="accounts" cascade="all">
<key column="catalog_id"/>
<one-to-many class="hibernate.model.Account"/>
</set>
</class>
</hibernate-mapping>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name="connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="connection.url">jdbc:mysql://localhost:3306/hibernate?autoReconnect=true</property>
<property name="connection.username">hibernate</property>
<property name="connection.password">hibernate</property>
<property name="connection.pool_size">1</property>
<property name="dialect">org.hibernate.dialect.MySQL5InnoDBDialect</property>
<property name="show_sql">true</property>
<property name="generate_statistics">true</property>
<property name="query.factory_class">org.hibernate.hql.classic.ClassicQueryTranslatorFactory</property>
<property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>
<property name="cache.use_minimal_puts">false</property>
<property name="cache.use_query_cache">false</property>
<property name="order_updates">false</property>
<property name="hbm2ddl.auto">create-drop</property>
<property name="current_session_context_class">thread</property>
<mapping resource="hibernate/persistence/hibernate/Account.hbm.xml"/>
<mapping resource="hibernate/persistence/hibernate/Catalog.hbm.xml"/>
</session-factory>
</hibernate-configuration> -
Hyperion- Can it Connect to two database at a time
Hi All,
I am new to Hyperion Reporting and Analysis. Kindly help me in the following Scenario.
Consider two database 'A' and 'B'
I want to create a report from tables from Database "A" and "B"
How to do that.
Kindly Help me out
Thanks in advance
Regards
GathaFor Interactive Reporting there are a couple options.
1. Us the OBIEE BI Server and model your semantic layer with the connections. The Product is designed for Federated Queries.
2. Build within Client
- Query 1 for Database A
- Query 2 for Database B
- Qyery 3 using local results build the data model from Query Results A and B - Joined appropriately
3. Depending on the Database - SQLServer, Oracle, DB2 etc you could connect to multiple DB within one OCE - You will need to look at Mark Ostroff's tips and tricks guide from previous Hyperion Conference for how to do it.
Hope this is Helpful
Wayne Van Sluys
TopDown Consulting -
How to connect one database in two threads?
Dear All,
If anyone can tell me how to connect one database concurrently?
I tried the following idea:
1.create a Hashtable to keep database objects(those databases have been opened)
2.Before openning(connecting) a database:first step is to check the hashtable.
If the the database object is in the hashtable, this object will be returned.
If the datatbase object is not in the hastable, open the database and store this opened database object into the hashtable.
I failed the test of this implementation. My test is:Create two threads (extend java Thread class).In each of these two threads, try to open the same database.Just like the following:
MyThread thread1 = new MyThread();
MyThread thread2 = new MyThread();
thread1.start();
thread2.start();
I guessed the database object in the hashtable would be returned in the second thread.Unfortunatly, I only got an exception which meant the database couldn't be opened twice.It looks like the second thread happened before the opened database object stored into the hashtable.
I cannot figure out if my design is wrong or my test application is wrong.
I really appriatiate your attentions!!!
Luum not sure i follow exactly but in your code add the word synchronise to it and this means only 1 tread can access it at any 1 time.
So your could have a class which is a singleton so it only opens the dbase once and then all other access share your connection.
so
public class foo{
foo INSTANCE = new foo();
private foo(){} //private constructor
then all your methods use foo's internal dbase connection. Am i making sense -
Connection Between Two Databases
Hi,
I have two databases called DBS1 and DBS2. Both are in one system. I need link between these two databases. I want a query as follows.
select * from cust@DBS2; # from DBS1
select * from temp_cust@DBS1; # from DBS2
Is possible link between DBS1 and DBS2.
Can any one tell me how to link these two databases each other.
Best Regards,
Nilopher.
nullNilopher,
You can connect to two different Oracle databases by creating a database link. When you say that both databases are in one system I assume you mean two databases on the same server. To create a database link you can do the following:
While logged onto DBS1:
create database link dbs2
connect to username identified by password
using 'dbs2.world'
Username and password are the user and password you want to connect as in dbs2.
If you want everyone to be able to access the database link you can say create public database link... otherwise only the user that created the database link can use it.
This should work assuming the database server tnsnames.ora file looks like this:
dbs2.world =
(DESCRIPTION =
(ADDRESS = (PROTOCOL= TCP)(Host= hostname)(Port= 1521))
(CONNECT_DATA = (SERVICE_NAME = dbs2))
If your databases are on two different servers you'd have to look at each one's tnsnames.ora file and make sure each one had an entry for the other's database.
I believe the database link name must be the same as the SERVICE_NAME if the parameter GLOBAL_NAMES=TRUE, if it's FALSE you can name it something else. By default this parameter is set to TRUE so I called the database link in the example dbs2.
You can then access data from dbs2 while logged into dbs1 exactly how you said:
select * from cust@DBS2;
You can then repeat the process to do the same thing on dbs2 to connect to dbs1.
Hope this helps. -
BI Publisher creating two database connection for scheduler configurations
Hi ,
please tell me how to create two database connection for scheduler configurations in BI Publisher
ADMIN -> scheduler configurations
Kind Regards,
MohanHi Saichand,
thank you for your Kind reply !!!!
Already i configured the scheduler configuration(DB) details for project1.Now i want to configure one more scheduler configuration(DB) for project2.
i want to maintain two scheduler config details for two DB.
Kind regards,
Mohan -
Connecting to two database simulteneously
I am writing code to get data out of an existing customer database and put this data into a new database as part of a product update. I am told I can start one database server, and use it to get connections to both databases. My problem is that the database are in essence the same - they are just in different directories. My directory structure looks like this:
c:\myapplication\my.db
c:\old_myapplication\my.db
To access the first database I do the following:
// initialize the database driver
String dbDriver = properties.getProperty("database_driver","com.sybase.jdbc2.jdbc.SybConnectionPoolDataSource");
String URL = "jdbc:sybase:Tds:127.0.0.1:2638";
try {
Class.forName(dbDriver);
} catch(Exception e) {}
originalDBConnection = DriverManager.getConnection(URL, "username","password");.....
This works fine and I connect to the first database. My problem is that I can't figure out how to connect to
the second database! I don't see where the path to the database is ever specified, and since both
databases use the same driver it seems I need to use the same URL.Thanks fun_one, you were right, I did need to create two connections. I'm using jconnect...I'll post the final solution for posterity :-).
To connect to two databases (and one server) using jconnect...
1. When starting the database server, specify the names and paths of your databases. Here is my command:
start dbsrv8.exe %2 %3 %4 -n %DBNAME% -c 32M -x tcpip -gkall -gdall -gx 30 c:\myapp\database\mydb.db -n db2 c:\myapp\database\mydb.db -n db1
....where db1 and db2 are the names of my databases.
2. Then initialize the database driver as normal:
// initialize the database driver
String dbDriver = properties.getProperty("database_driver","com.sybase.jdbc2.jdbc.SybConnectionPoolDataSource");
try {
Class.forName(dbDriver);
} catch(Exception e) {
e.printStackTrace(System.out);
}3. Now, when getting a connection add the database name to the url
//Connect to db1
String urlOne = "jdbc:sybase:Tds:127.0.0.1:2638?ServiceName=db1";
Connection db1connection = DriverManager.getConnection(urlOne, dbUserName, dbPassword);
//Connect to db2
String urlTwo = "jdbc:sybase:Tds:127.0.0.1:2638?ServiceName=db2";
Connection db2connection = DriverManager.getConnection(urlTwo, dbUserName, dbPassword);I found the following webpage very useful:
http://manuals.sybase.com/onlinebooks/group-sas/awg0703e/dbugen7/@Generic__BookTextView/47925 -
Hi
We have an application based on two databases (.dbf and mysql). Does exist only one way to question those two databases?
TanksHi
Yes! You can do this with ODBC.
Class.forName("sun.jdbc.JdbcOdbcDriver");
Connection con = DriverManager.getConnection("jdbc:odbc:DB2SDN","user","pass");
Connection con1 = DriverManager.getConnection("jdbc:odbc:mySQLDSN","user","pass");
Statement st1 = con.createStatement();
Statement st2 = con1.createStatement();
ResultSet rs1 = st1.executeQuery(strQuery);
ResultSet rs2 = st2.executeQuery(strQuery);
Is that what you are looking for ?
Thanks
Swaraj -
How to connect two different oracle databases
Hi All,
I have a special scenario like the following:
I have an oracle Database 10g, it has to get some data from the Oracle Apps Database (the API is defined in the Views and Packages of the 10g database)
Is it possible for me to make a connection with the 10g database to the Apps database.
Do I have to use any engines like JDBC for the connection between the two databases
The issue here is because of security Issue, I cant create a database schema in the Apps database
What can be the solution for this issue..
Many thanks in advance
and best regards.......You might be able to use a database link to connect from one db to another.
-
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."
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