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How to implement one-to-one, one-to-many and many-to-many relationships while designing tables?
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One-to-one: Use a foreign key to the referenced table:
student: student_id, first_name, last_name, address_id
address: address_id, address, city, zipcode, student_id # you can have a
# "...
Check if a dialog is displayed with Espresso
...e tests with the new android-test-kit (Espresso) . But I can't find any information on how to check if a dialog is displayed and perform some actions on it (like clicking the positive and negative buttons, e.t.c.). Note that a dialog may be also displayed by a WebView , not by the application it...
Is there a MySQL option/feature to track history of changes to records?
...e database just by looking at audit tables, it's hard and error prone, and for any complicated database logic, it becomes unwieldy. For instance, if the business wants to know "find the addresses of the letters we should have sent to customers who had outstanding, unpaid invoices on the first day of...
How to print a query string with parameter values when using Hibernate
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You need to enable logging for the the following categories:
org.hibernate.SQL - set to debug to log all SQL DML statements as they are executed
org.hibernate.type - set to trace to log all JDBC parameters
So a log4j configuration could look li...
Can I use CASE statement in a JOIN condition?
... 1. Your statement attempted to return the value of an assignment or test for equality, neither of which make sense in the context of a CASE/THEN clause. (If BOOLEAN was a datatype then the test for equality would make sense.)
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Patterns for handling batch operations in REST web services?
What proven design patterns exist for batch operations on resources within a REST style web service?
8 Answers
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How do I get the “id” after INSERT into MySQL database with Python?
...ause issues unless you properly utilize threadsafety. I've personally gone for instantiating a new connection for each thread, which is a cute workaround since for some reason committing (autocommitting actually) didn't work for me, I got some serious interweaving due to many concurrent threads all ...
Delete multiple records using REST
...;2;3; not purge /records/1, /records/2 or /records/3; proxy a 410 response for /records/1;2;3, or other things that don't make sense from your point of view.
This choice is best, and can be done RESTfully. If you are creating an API and you want to allow mass changes to resources, you can use REST t...
Get generated id after insert
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@UnknownJoe I know this is old post. But may be helpful for someone. The row id and autoincremented id will be same even if it is deleted from middle.
– Raj kannan Iyyappan
Oct 4 '18 at 21:25
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MySQL Insert Where query
...1, 160, 145);
If you're trying to change the weight/desiredWeight values for an existing row with ID 1 you should be using:
UPDATE Users SET weight = 160, desiredWeight = 145 WHERE id = 1;
If you want you can also use INSERT .. ON DUPLICATE KEY syntax like so:
INSERT INTO Users (id, weight, de...