Why we should go for Database testing? code example

Example 1: what do we need to test in database testing

In Database testing, 

Testing of Data Integrity
Testing of Data Validity
Data base related performance
Testing of functions, procedure and triggers
are necessary to test.

What is Database Black Box Testing?

	Database Black Box testing involves:
	•	Data Mapping
	•	Data stored and retrieved
	•	Use of Black Box testing techniques
    such as Equivalence Partitioning 
    and Boundary Value Analysis

Example 2: how to do database testing in your framework

For database testing For manual I use Oracle sql developer for producing SQL
queries
FOR AUTOMATION; I use JDBC library to integrate
java by getting a CONNECTION from oracle database
then creating STATEMENTS using SQL queries and
then storing the data into a RESULTSET object.
I use java data structures to use store data inside and
compare them
and since I'm using DATA DRIVEN and CUCUMBER
BDD framework, all of these tests are stored inside feature
files
I have RUNNER classes that helps generate codes from
FEATURE FILE and implement them into a file called b
I also have HOOK class that implements my codes that
run before and after all my tests - this is where I invoke my
TAKESCREENSHOT interface which triggers when I use
scenario interface (when scenario fails)
It takes a picture when you are on the step that failed
StepDefinition - this is where I stored my codes that
based on gherkin language expected value DDT
If I'm working with small amounts of test data, I'm
going to operate with scenario outlines, this where I create
examples and store data using pipeline
In my automation framework I had database utility class
which handles everything related to setting up
connections, closing connections, getting data from
database and storing results from database into
different collections arrays etc. So that I can easily work with
it.
And I use it in my framework by
 using Connection interface, with getConnection method(url,username, password)
I’m keeping url, username, password in the configuration
file
url starts with oracle or postgresql, mysql...
url:"jdbc:oracle:thin:@url:1521:xe";
Syntax:
Connection connection = DriverManager.getConnection(url,
username, password) //throws SQL exception:checked
exception
Statement statement = connection.CreateStatement()
//throws SQL exception: checked exception
ResultSet resultSet = statement.executeQuery("Query")
resultSet.getObject/String/int(index)
ResultSetMetaData
resultSetMetaData=resultSet.getMetaData() columns
First,
getConnection -> connection.CreateStatement -> Resultset
resultset
ResultSetMetaData rsm = resultSet.getMetaData();
I can retrieve the column names and counts with the help of
rsm.getColumnName(i)/getColumnCount(),
Make sure you start your loop from 1 until <= last value
How did you do DB testing in your framework?
List <Map<String, String>> list = new ArrayList<>();
while(resultset.next()){
Map<String, String> map = new HashMap<>();
for(i = 1; i<= rsm.getColoumnCount;i++ ){
map.put(rsm.getColoumnName(i), result.getString(i))
}
list.add(map);
}
sout(list.get(3).get("key"))