Python Programming Training Certification
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Course Overview
Python is one of the world’s top programming languages used today and Python training has become the most popular training across individuals. Training Basket’s Python Training & Certification course covers basic and advanced Python concepts and how to apply them in real-world applications.Python is a flexible and powerful open-source language that is easy to learn and consists of powerful libraries for data analysis and manipulation. Our Python training course content is curated by experts as per the standard Industry curriculum. The curriculum, coding challenges and real-life problems cover data operations in Python, strings, conditional statements, error handling, shell scripting, web scraping and the commonly used Python web framework Django. Take this Python training and certification course and become job-ready now.
Read Operation
The SELECT statement is used to read the values from the databases. We can restrict the output of a select query by using various clause in SQL like where, limit, etc.
Python provides the fetchall() method returns the data stored inside the table in the form of rows. We can iterate the result to get the individual rows.
In this section of the tutorial, we will extract the data from the database by using the python script. We will also format the output to print it on the console.
Example
-
import mysql.connector
#Create the connection object
myconn = mysql.connector.connect(host = “localhost”, user = “root”,passwd = “google”,database = “PythonDB”)#creating the cursor object
cur = myconn.cursor()try:
#Reading the Employee data
cur.execute(“select * from Employee”)#fetching the rows from the cursor object
result = cur.fetchall()
#printing the resultfor x in result:
print(x);
except:
myconn.rollback()myconn.close()
Output:
-
(‘John’, 101, 25000.0, 201, ‘Newyork’)
(‘John’, 102, 25000.0, 201, ‘Newyork’)
(‘David’, 103, 25000.0, 202, ‘Port of spain’)
(‘Nick’, 104, 90000.0, 201, ‘Newyork’)
(‘Mike’, 105, 28000.0, 202, ‘Guyana’)
Reading specific columns
We can read the specific columns by mentioning their names instead of using star (*).
In the following example, we will read the name, id, and salary from the Employee table and print it on the console.
Example
-
import mysql.connector
#Create the connection object
myconn = mysql.connector.connect(host = “localhost”, user = “root”,passwd = “google”,database = “PythonDB”)
#creating the cursor object
cur = myconn.cursor()
try:
#Reading the Employee data
cur.execute(“select name, id, salary from Employee”)#fetching the rows from the cursor object
result = cur.fetchall()
#printing the result
for x in result:
print(x);
except:
myconn.rollback()
myconn.close()
Output:
-
(‘John’, 101, 25000.0)
(‘John’, 102, 25000.0)
(‘David’, 103, 25000.0)
(‘Nick’, 104, 90000.0)
(‘Mike’, 105, 28000.0)
The fetchone() method
The fetchone() method is used to fetch only one row from the table. The fetchone() method returns the next row of the result-set.
Consider the following example.
Example
-
import mysql.connector
#Create the connection object
myconn = mysql.connector.connect(host = “localhost”, user = “root”,passwd = “google”,database = “PythonDB”)#creating the cursor object
cur = myconn.cursor()try:
#Reading the Employee data
cur.execute(“select name, id, salary from Employee”)#fetching the first row from the cursor object
result = cur.fetchone()#printing the result
print(result)except:
myconn.rollback()myconn.close()
Output:
- (‘John’, 101, 25000.0)
Formatting the result
We can format the result by iterating over the result produced by the fetchall() or fetchone() method of cursor object since the result exists as the tuple object which is not readable.
Consider the following example.
Example
-
import mysql.connector
#Create the connection object
myconn = mysql.connector.connect(host = “localhost”, user = “root”,passwd = “google”,database = “PythonDB”)#creating the cursor object
cur = myconn.cursor()try:
#Reading the Employee data
cur.execute(“select name, id, salary from Employee”)#fetching the rows from the cursor object
result = cur.fetchall()print(“Name id Salary”);
for row in result:
print(“%s %d %d”%(row[0],row[1],row[2]))
except:
myconn.rollback()myconn.close()
Output:
-
Name id Salary
John 101 25000
John 102 25000
David 103 25000
Nick 104 90000
Mike 105 28000
Using where clause
We can restrict the result produced by the select statement by using the where clause. This will extract only those columns which satisfy the where condition.
Consider the following example.
Example: printing the names that start with j
-
import mysql.connector
#Create the connection object
myconn = mysql.connector.connect(host = “localhost”, user = “root”,passwd = “google”,database = “PythonDB”)#creating the cursor object
cur = myconn.cursor()try:
#Reading the Employee data
cur.execute(“select name, id, salary from Employee where name like ‘J%'”)#fetching the rows from the cursor object
result = cur.fetchall()print(“Name id Salary”);
for row in result:
print(“%s %d %d”%(row[0],row[1],row[2]))
except:
myconn.rollback()myconn.close()
Output:
-
Name id Salary
John 101 25000
John 102 25000
Example: printing the names with id = 101, 102, and 103
-
import mysql.connector
#Create the connection object
myconn = mysql.connector.connect(host = “localhost”, user = “root”,passwd = “google”,database = “PythonDB”)#creating the cursor object
cur = myconn.cursor()try:
#Reading the Employee data
cur.execute(“select name, id, salary from Employee where id in (101,102,103)”)#fetching the rows from the cursor object
result = cur.fetchall()print(“Name id Salary”);
for row in result:
print(“%s %d %d”%(row[0],row[1],row[2]))
except:
myconn.rollback()myconn.close()
Output:
-
Name id Salary
John 101 25000
John 102 25000
David 103 2500
Ordering the result
The ORDER BY clause is used to order the result. Consider the following example.
Example
-
import mysql.connector
#Create the connection object
myconn = mysql.connector.connect(host = “localhost”, user = “root”,passwd = “google”,database = “PythonDB”)#creating the cursor object
cur = myconn.cursor()try:
#Reading the Employee data
cur.execute(“select name, id, salary from Employee order by name”)#fetching the rows from the cursor object
result = cur.fetchall()print(“Name id Salary”);
for row in result:
print(“%s %d %d”%(row[0],row[1],row[2]))
except:
myconn.rollback()myconn.close()
Output:
-
Name id Salary
David 103 25000
John 101 25000
John 102 25000
Mike 105 28000
Nick 104 90000
Order by DESC
This orders the result in the decreasing order of a particular column.
Example
-
import mysql.connector
#Create the connection object
myconn = mysql.connector.connect(host = “localhost”, user = “root”,passwd = “google”,database = “PythonDB”)#creating the cursor object
cur = myconn.cursor()try:
#Reading the Employee data
cur.execute(“select name, id, salary from Employee order by name desc”)#fetching the rows from the cursor object
result = cur.fetchall()#printing the result
print(“Name id Salary”);
for row in result:
print(“%s %d %d”%(row[0],row[1],row[2]))except:
myconn.rollback()myconn.close()
Output:
-
Name id Salary
Nick 104 90000
Mike 105 28000
John 101 25000
John 102 25000
David 103 25000
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