This document discusses connecting to and interacting with databases in Python. It covers creating a database connection, using cursors to execute queries, and retrieving data using methods like fetchone(), fetchall(), and rowcount. Examples are provided for inserting, deleting, updating data as well as using dictionary cursors and committing or rolling back transactions.

1. WELCOME TO PYTHON SESSION 10WELCOME TO PYTHON SESSION 10

2. AGENDA
 Database Connection
 What is Cursor.
 What is the uses of MySQLdb in python.

3. Database Connection

4. Creating Database Table

5. Insert Operation

6. Delete Operation

7. Read Operation
Once our database connection is established, we are ready
to make a query into this database.
Fetchone():
This method fetches the single row of a query result set. A
result set is an object that is returned when a cursor object is
used to query a table.
Fetchall():
This method fetches all the rows in a result set. If some
rows have already been extracted from the result set, the
fetchall() method retrieves the remaining rows from the result
set.
Rowcount:
This is a read-only attribute and returns the number of rows
that were affected by an execute() method.

8. Example

9. Inserting Images

10. The dictionary cursor
There are multiple cursor types in the MySQLdb module.
The default cursor returns the data in a tuple of tuples.
When we use a dictionary cursor, the data is sent in a form
of Python dictionaries. This way we can refer to the data by
their column names.

11. Example

12. Connection Objects
COMMIT Operation:
Commit is the operation, which gives a green signal
to database to finalize the changes, and after this
operation, no change can be reverted back
db.commit()
ROLLBACK Operation:
If you are not satisfied with one or more of the
changes and you want to revert back those changes
completely, then use rollback() method.
db.rollback()

13. Connection Objects
COMMIT Operation:
Commit is the operation, which gives a green signal to
database to finalize the changes, and after this
operation, no change can be reverted back
db.commit()
ROLLBACK Operation:
If you are not satisfied with one or more of the changes
and you want to revert back those changes completely,
then use rollback() method.
db.rollback()

14. THANK YOU

15. Reference
Reference Link:
http://www.tutorialspoint.com/python/python_databa
se_access.htm