Python mysqldb select all

How to select all the data from a table using MySQL in Python?

The tables in MySQL consist of rows and columns. The columns specify the fields and the rows specify the records of data. The data in the tables needs to be fetched to use. We may at times need to fetch all the data from the MySQL table.

All the rows can be fetched from the table using the SELECT * statement.

Syntax

The * in the above syntax means to fetch all the rows from the table.

Steps you need to follow to select all the data from a table using MySQL in python

• import MySQL connector
• establish connection with the connector using connect()
• create the cursor object using cursor() method
• create a query using the appropriate mysql statements
• execute the SQL query using execute() method
• close the connection

Suppose we have a table named ‘MyTable’ and we want to fetch all the data from this table.

+----------+---------+-----------+------------+ | Name | Class | City | Marks | +----------+---------+-----------+------------+ | Karan | 4 | Amritsar | 95 | | Sahil | 6 | Amritsar | 93 | | Kriti | 3 | Batala | 88 | | Khushi | 9 | Delhi | 90 | | Kirat | 5 | Delhi | 85 | +----------+---------+-----------+------------+

Example

import mysql.connector db=mysql.connector.connect(host="your host", user="your username", password="your password",database="database_name") cursor=db.cursor() query="SELECT * FROM MyTable" cursor.execute(query) for row in cursor: print(row)

The above code execute the select * query which fetches all the rows from the table. Later , we print all the rows using for statement.

Output

(‘Karan’, 4, ‘Amritsar’ , 95) (‘Sahil’ , 6, ‘Amritsar’ ,93) (‘Kriti’ , 3 ‘Batala’ , 88) (‘Khushi’ , 9, ‘Delhi’ , 90) (‘Kirat’ , 5, ‘Delhi’ ,85)

Источник

Python MySQL Select From

To select from a table in MySQL, use the «SELECT» statement:

Example

Select all records from the «customers» table, and display the result:

mydb = mysql.connector.connect(
host=»localhost»,
user=»yourusername«,
password=»yourpassword«,
database=»mydatabase»
)

mycursor.execute(«SELECT * FROM customers»)

Note: We use the fetchall() method, which fetches all rows from the last executed statement.

Selecting Columns

To select only some of the columns in a table, use the «SELECT» statement followed by the column name(s):

Example

Select only the name and address columns:

mydb = mysql.connector.connect(
host=»localhost»,
user=»yourusername«,
password=»yourpassword«,
database=»mydatabase»
)

mycursor.execute(«SELECT name, address FROM customers»)

Using the fetchone() Method

If you are only interested in one row, you can use the fetchone() method.

The fetchone() method will return the first row of the result:

Example

mydb = mysql.connector.connect(
host=»localhost»,
user=»yourusername«,
password=»yourpassword«,
database=»mydatabase»
)

mycursor.execute(«SELECT * FROM customers»)

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