How to construct a magic connect command with variable? For example with a variable value as myserver.
#!value --name sqlserver
myserver
#!share sqlserver --from value
string sqlconnstr = $"Server={sqlserver}; Initial Catalog=mydb; Persist Security Info=False; Integrated Security=true;";
#!connect mssql --kernel-name mydb sqlconnstr
This doesn't work.
Expecting to have something similar that can take a variable like this static command that works,
#!connect mssql --kernel-name mydb "Server=myserver; Initial Catalog=mydb; Persist Security Info=False; Integrated Security=true;"
Received clarification from .net interactive contributor.
Values from other kernels can be inlined with the syntax #kernelName:variableName so in your scenario it could look something like this:
#!connect mssql --kernel-name mydb #csharp:sqlconnstr
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 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 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;"
After connecting to a Netezza system is there any way to switch the database? For instance, in MSSQL one could send the command use database_name in order to switch to the database_name.
Is there anything in Netezza like "use" on mssql?
http://technet.microsoft.com/en-us/library/ms188366.aspx
My reason for asking is in regards to metadata queries; I can only access _v_table of the "currently connected database".
Prior to Version 7.0 there wasn't an equivalent to USE. You had to log in to specific databases on the server however you can still access any object using. database.schema.objectname
Post Version 7.0 the equivalent is Set Catalog
SET CATALOG <database_name>
Regarding your specific inquiry. Please consider using _V_TABLE_XDB instead of _V_TABLE. This system table should provide you with a list of all tables, not just those in the database you are connected to.
If you're using NPS v7.0+, then the SET CATALOG command will connect you to a different database dynamically (without having to disconnect and reconnect). The beauty of this command is that it can be submitted from an ODBC/JDBC client as well as in an nzsql script.
In Netezza you can to other database with following command -
nzsql -u <username> -pw <password> -db <databasename> -host <netezza server IP>
hope this will help you.
As we know while executing any query in netezza we need to specify database name in connection url , which we should to make dynamic according to required database on which we have to perform operation, so in case of simple java code we can use the below Case 1) and in case of spring boot we can use below Case 2).
Case 1)
before executing any query in netezza we can execute statement as
SET CATALOG #database name#;
so it will automatically switch to database provided in set command.
Case 2)
We can switch the database in netezza with runtime switching of database
Use Apache basic data source (BasicDataSource) instead of DriverManagerDataSource while creating bean for datasource
Execute - jdbcTemplate.execute("SET CATALOG #database name#")
Before executing any query.
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.