i am trying to connect to the remote database.With given username and password ,i am able to connect in toad.but in the code while handling connection pooling i am getting null connection.so i want to recheck the hostname for this particular DB?how can i check it in Toad?
String url = "jdbc:oracle:thin:#hostname:dbname";
connection = DriverManager.getConnection(url,"username","password");
System.out.println("got the connection"+connection);
i tried connecting using the credentials which i am havving but i getting null connection.i want to recheck the hostname..any idea how can i check the hostname in toad for remote Database?
You may try this:
SELECT host_name FROM v$instance
Related
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.
I don't know much about databases - Sorry if the question seems silly.
I have sql server 2012 on my machine and i create simple database table.
I want to connect to this database table thru C# code.
So, I need to know my ConnectionString.
I don't understand the parameters of the ConnectionString.
I try to google it - but still didn't find any good explanation.
Anyone can please explain the connectionString fields ?
How to define the connectionString that i will be able to connect the local database ?
thanks
Your connection string should be as simple as like below
Data Source=.;Initial Catalog=DB_NAME;Integrated Security=True"
Where
Data Source=. means local database
Initial Catalog=DB_NAME means the database it will connect to
Integrated Security=True means it will use windows authentication (no user name and password needed; it will use logged in credential)
Take a look Here
(OR)
Search in Google with key term sqlconncectionstring which will fetch you many help.
EDIT:
You are getting exception cause Initial Catalog=DB_Name\Table_001. It should be Initial Catalog=DB_Name (only database name). Provide the table name in sql query to execute. Check some online tutorial to get more idea on the same.
You use . in data source only when you are connecting to local machine database and to the default SQL Server instance. Else if you are using different server and named SQL Server instance then your connection string should look like
using(SqlConnection sqlConnection = new SqlConnection())
{
sqlConnection.ConnectionString =
#"Data Source=Actual_server_name\actual_sqlserver_instance_name;
Initial Catalog=actual_database_name_Name;
Integrated Security=True;";
sqlConnection.Open();
}
In case you are using local machine but named SQL Server instance then use
Data Source=.\actual_sqlserver_instance_name;
Initial Catalog=Actual_Database_NAME;Integrated Security=True"
using System.Data.SqlClient;
Then create a SqlConnection and specifying the connection string.
SqlConnection myConnection = new SqlConnection("user id=username;" +
"password=password;server=serverurl;" +
"Trusted_Connection=yes;" +
"database=database; " +
"connection timeout=30");
Note: line break in connection string is for formatting purposes only
SqlConnection.ConnectionString
The connection string is simply a compilation of options and values to specify how and what to connect to. Upon investigating the Visual Studio .NET help files I discovered that several fields had multiple names that worked the same, like Password and Pwd work interchangeably.
User ID
The User ID is used when you are using SQL Authentication. In my experience this is ignored when using a Trusted_Connection, or Windows Authentication. If the username is associated with a password Password or Pwd will be used.
"user id=userid;"
Password or Pwd
The password field is to be used with the User ID, it just wouldn't make sense to log in without a username, just a password. Both Password and Pwd are completely interchangeable.
"Password=validpassword;"-or-
"Pwd=validpassword;"
Data Source or Server or Address or Addr or Network Address
Upon looking in the MSDN documentation I found that there are several ways to specify the network address. The documentation mentions no differences between them and they appear to be interchangeable. The address is an valid network address, for brevity I am only using the localhost address in the examples.
"Data Source=localhost;"
-or-
"Server=localhost;"
-or-
"Address=localhost;"-or-"Addr=localhost;"
-or-"Network Address=localhost;"
Integrated Sercurity or Trusted_Connection
Integrated Security and Trusted_Connection are used to specify wheter the connnection is secure, such as Windows Authentication or SSPI. The recognized values are true, false, and sspi. According to the MSDN documentation sspi is equivalent to true. Note: I do not know how SSPI works, or affects the connection.
Connect Timeout or Connection Timeout
These specify the time, in seconds, to wait for the server to respond before generating an error. The default value is 15 (seconds).
"Connect Timeout=10;"-or-
"Connection Timeout=10;"
Initial Catalog or Database
Initial Catalog and Database are simply two ways of selecting the database associated with the connection.
"Inital Catalog=main;"
-or-
"Database=main;"
I am trying to use a for loop to connect to different servers and then do some job for each server. In the "expressions" of the connection manager for my loop, i see ServerName and ConnectionString.
I don't know the difference between ServerName and ConnectionString. If I put an ip address inside my servername variable,will i be able to connect to a data base ? If i use connectionstring, will i have to put username and password in that ? How do I know which one to use ?
The server name is just a component of a connection string. A connection string specifies different properties of how you connect to a server. Such as credentials (user name, password, etc). Based on your other question that I'm trying to help you through, you want to set server name.
Think of the server name as the name of the machine. The connection string includes the name of the database and what account you are going to use to connect.
The server name is just one part of the connection string.
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.
I cannot connect to my local sql server using the following line
conn = SqlConnection("server=(local);uid=tedpottel;pwd=#######;database=by")
I have security set to Windows Authentication , so my other programs (reporting services and cold fusion do not take in a password. (as long as I log in as tedpottel) So I tried
conn = SqlConnection("server=(local);database=by")
which said "failed for user''"
If you do windows authentication, you don't need userID and password
You need to add ;Trusted_Connection=True, it would look like this
Server=(local);Database=by;Trusted_Connection=True;
see here http://connectionstrings.com/sql-server-2008
Are you sure that you have Mixed Authentication enabled:
and are you sure that you are typing in the password correctly as well?