I'm trying to learn how to use Oracle Container database, and just do basic JDBC connections. I installed a dockerised version of Oracle:
https://hub.docker.com/_/oracle-database-enterprise-edition
Which according to the data sheet comes set up with a CDB database called ORCLCDB and a PDB database called ORCLPDB1.
So I figured out I can connect to it like this:
jdbc:oracle:thin:#localhost:1555:ORCLCDB
with username sys, password Oradoc_db1, and setting the special internal_logon jdbc parameter equal to "sysdba" to avoid the error "local oracle CDB: ORA-28009: connection as SYS should be as SYSDBA or SYSOPER"
And I figured out I can switch to the PDB by entering this:
ALTER SESSION SET CONTAINER=ORCLPDB1
And I can then create a new user:
CREATE USER MYUSER IDENTIFIED BY MYPASSWORD1
But then I'm stuck. I think there should be some way to connect directly to the PDB using a JDBC connect string. Every time I google about this, it talks about tnsnames blah blah, but people who use JDBC connections, are typically using Tomcat on a server, or otherwise don't have the Oracle Client installed. They expect to be able to connect to Oracle just with the thin driver installed, nothing else.
I've tried the obvious using:
jdbc:oracle:thin:#localhost:1555:ORCLPDB1
with username myuser or sys, but I always get:
ORA-12505, TNS:listener does not currently know of SID given in connect descriptor
At this point I'm stuck.
You need to use a SERVICE_NAME in order to connect to an Oracle container database
Please alter your connect string like this:
jdbc:oracle:thin:#localhost:1555/ORCLPDB1
A SERVICE_NAME is denoted by a "/"
A SID (SystemIDentifier) is denoted by a ":" (not to be used)
Note! Default listener port is 1521, not sure why you specifically want a different port.
Best of luck!
Apparently the correct answer is this...
jdbc:oracle:thin:#localhost:1521/ORCLPDB1.localdomain
Then I can connect as SYS using the method above. If I want to connect as the created user, I also need...
grant create session to myuser;
and then, turn off the internal_logon jdbc parameter.
Related
I'm considering using remote OS authentication to connect to an Oracle database (version 11g). What are the guidelines for using [remote_os_authent]
Here's what I want to do:
We set up a catalog DB to used by RMAN to store metadata about Oracle databases.
I want to connect to the catalog DB via the local machine and execute this command for resync catalog db:
rman target sys/pass#localdb;
connect catalog catuser/password#catdb;
RESYNC CATALOG;
Is it possible for me to do this through oracle Enterprise Manager job?
(I did this process by calling the execute file, but the problem is that the passwords are clear in the executable file.)
I need it because I do not want user passwords to be available and visible.
I can't use oracle valet for passwordless connection.
Using remote os authentication is considered a bad habit because it is insecure.
If you want to have scripting without having to store passwords in a readable format to prevent leaking passwords, easiest is to use the oracle wallet for this.
This still keeps you busy maintaining passwords in the database and in the wallet but it is pretty safe.
Your connection would be something line sqlplus /#tns_alias
where the tns_alias is the key into the wallet that fetches the username and the password.
An example of setup can be found here: http://ronr.blogspot.com/2017/01/cleartext-userid-and-passwords-in.html
An other option could be to enable Central Managed Users (CMU) and kerberos. This does need quite a bit of setup and is less suitable for scripting. For interactive use it works very nice, assuming you have kerberos correctly setup.
An example of CMU setup can be found here: https://blog.pythian.com/part-1-creating-an-oracle-18c-centrally-managed-users-testbed-using-oracle-cloud-infrastructure/
Please change back remote_os_authentication to false. It is not safe because users can easily be spoofed.
I am using Apache Superset and to connect to the SQLServer, I am using the below url which works fine but connects to master DB on MSSQL. I wanted to connect to another DB on MSSQL but do not know how to do that
mssql+pymssql://<username>:<password>#<freetds_name>/?charset=utf8
Is there a way I can explicitly mention the DB name in the url ?
Another issue I have is my db name has space in it, it is "Data Analytics"
Try
mssql+pymssql://user:pass#host/db
Reference: http://docs.sqlalchemy.org/en/latest/dialects/mssql.html
I was not able to find the required parameter where I can just mention the name of the DB in url. Although there are ways of doing it but if you are using freetds_name, I have not see any option of setting DB name.
I tried setting default Database name in odbc.ini but for some reason it did not work.
The easiest way is to execute any of the below SQL
EXEC '<Login_name in Quotes>', '<DB name in Quotes>'
OR
ALTER LOGIN <Login_Name_noQuotes>
with DEFAULT_DATABASE = <DB_name_no_quotes
Since my DB name had space in it, I implemented the first statement and it worked.
You can check the Default DB by executing below SQL
select name,
loginname,
dbname as DefaultDB
from syslogins
(I am a sql noob and I just can not figure this out on my own)
For some time now I have been trying to establish a connection to a SQL database in codename one but to no avail. First I tried connecting to a MariaDB database from one.com. All that's needed for the connection is
Database db = Display.getInstance().openOrCreate("databaseName");
if I am not mistaken, but I am guessing this implies that I have somehow already established a connection to the database. This is not the case however so it creates a new .sql file, right? I can recall that you can connect to a database in the services tab in Netbeans. I chose the MySQL(Connector/ J Driver) which should work with MariaDB, or should it? I entered all my data and i says that it can not establish connection to the database.
the error i get
So I thought I might as well try using localhost. I used XAMPP to host a database and connected in the netbeans services tab.
connected?
Now testing was needed to see if this works. I started the SQL journey with this https://www.codenameone.com/manual/files-storage-networking.html#_sql and integrated the part after "You can probably integrate this code into your app as a debugging tool". I changed database name to "mybase" (it's existance can be confirmed in picture 2). Ran the app, opened the dialog, entered "select ID from customers" and got: java.sql.SQLException: [SQLITE_ERROR] SQL error or missing database (no such table: customers) It does not get past the first call to "executeQuery". The customers table definitely exists so what am I missing to establish connection?
I really need instructions to connect to the localhost database and ideally also to the one hosted by my webhost provider.
Thanks,
Jona
The Database class is to access the SQLite DB on the mobile device. To connect to external databases, you'd have to do something different, such as a ConnectionRequest or Socket I think.
I have created a local db using SQLEXPRESS through Visual Basic.
I intend to use LINQ to connect to the database from the application. Here is my statement to initially connect to the database:
Dim db As New DataContext("Data Source=localhost\SQLEXPRESS; Initial Catalog=master; Integrated Security=True;")
Ideally, my database would be entered for Initial Catalog, but that was giving me authentication errors for some reason. Now that this statement executes, my next step is to connect to my specific database. However, when I try to connect with a statement like this:
Dim TestCommand = db.ExecuteCommand("Use MyDB.mdf")
I get an error that the database does not exist.
When I query my database with the following commands:
SELECT name FROM master.sys.databases
The returned values are master, tempdb, model, msdb, and C:USERS\MY NAME\DOCUMENTS\MyDB.mdf
I have tried the above "TestCommand" writing out the directory for the database, but I get an error at "C:".
So, my db exists, but can someone explain to me the syntax I should use to "USE" my database?
You should not use the use command this way! You must connect to the application's database directly by setting it as Initial Catalog. If you're not authorized to do so, a use command won't let you either, by the way. So you have to fix the authorization for the database: create a login for your windows account in Sql Server Management Studio and grant it read/write access to the application's database.
I installed oracle 11g in my machine and created tablespaces and user.
Evereything ran succesfully. Now im trying to create a new conenction thru sqlDeveloper but i get this error. I checked the SID name and changed them according to tnsnames.ora. what else might go wrong?
Don't use the tnsnames.ora and set the connection type to "Basic".
Enter your connection details (SID, Port, host, username and password) accordingly.
Use connection type basic, and dont use hyphen "-" in the connection name, while use underscore "_". and then try again to connect
If the database is on your machine, and you're still talking about 11g, then you can simply do this:
Connection Type: Basic
Hostname: localhost (you said it the db was on YOUR machine, yes?)
Port: 1521 (this is the default unless you changed it)
SID: orcl for regular db or xe for Express edition
Service Name: use this if 12c with Pluggable Database
Or course for username and password:
username: system (a default ADMIN account, less dangerous than SYS)
password: whatever you provided when creating your database
If you are going to login as SYS, you must change the Role from default to SYSDBA.
If you have TNSNames.ora file, we should find it, and you can set your Connection Type to TNS, and simply pick your database from the dropdown.
As you can imagine, when you have MANY databases, the TNS path is much easier, but you will need to maintain this file. Otherwise, Basic is the easiest way to go.