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Help writing database queries for derby?


Help writing database queries for derby?

By : Santosh
Date : October 28 2020, 08:00 PM
around this issue You do not make clear what condition links a Person record with a Parent record. For this example, I am going to assume that Person contains an additional field, not mentioned by you, called FatherSSN. If so:
code :


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Writing Unit Tests for method that queries database

Writing Unit Tests for method that queries database


By : Riddish Mukherjee
Date : March 29 2020, 07:55 AM
it helps some times Remember that TDD is as much about good design than it is about testing. This method has too much going on; it violates the Separation of Concerns principle.
You've already identified several areas that will need to be tested:
When preforming bulk insert in Apache Derby database using JDBC, I get a Syntax error: DERBY-PROPERTIES. What am I doing

When preforming bulk insert in Apache Derby database using JDBC, I get a Syntax error: DERBY-PROPERTIES. What am I doing


By : Amaury C
Date : March 29 2020, 07:55 AM
like below fixes the issue Firstly, you can get more information from the exception; here's how: http://wiki.apache.org/db-derby/UnwindExceptionChain
Secondly, you should find your 'derby.log' file on disk; it will have lots more information about what went wrong.
apache Derby - getting java.io.FileNotFoundException: derby.log (Access is denied) when creating new database

apache Derby - getting java.io.FileNotFoundException: derby.log (Access is denied) when creating new database


By : sayjay
Date : March 29 2020, 07:55 AM
wish helps you A file named derby.log will be created in the current working directory when you run ij (or attempt to use embedded Apache Derby in some other application). From the post, it appears you are executing this from C:\ and the user you are logged on as does not have write access to that directory: change to a directory where the user has permission to create a file and retry.
Note it is possible to suppress this log file (though I have not yet done this myself). See Getting rid of derby.log. However, suppressing the log file would just result in another failure in your case because the database will be created on the file system relative to the current directory. That is, an attempt to create the directory named Mynewdb in the current directory, C:\, would also fail for the same reason. It is possible to specify a path for the database to avoid creating in the current working directory:
Derby: Another instance of Derby may have already booted the database

Derby: Another instance of Derby may have already booted the database


By : Danylo Prozorov
Date : March 29 2020, 07:55 AM
Does that help I would like to use Derby in a Network Server Mode and followed the instructions on their website. , Your ij connection did:
code :
  connect 'jdbc:derby:testDB';
  connect 'jdbc:derby://localhost:1527/testDB';
writing SQL queries in db2 database

writing SQL queries in db2 database


By : cts
Date : March 29 2020, 07:55 AM
wish helps you STRSQL as suggested previously would work fine but it is a green screen (5250 emulation) option; if you are not familiar with that environment, I would recommend you use the 'Run SQL Script' function from either IBM i Access Client Solutions or IBM i Navigator, whichever is available to you.
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