FLASK SQLITE SAMPLE INSTALL
FLASK SQLITE SAMPLE FULL
FLASK SQLITE SAMPLE CODE

You can apply filters to the retrieved record set by using the filter attribute.For example, to retrieve records for city = ‘Tokyo’ in student tables, use the following statement: 1 # retrieves all records (corresponding to SELECT queries) from the table. The following session method performs CRUD operations: 1 SQLAlchemy’s Session object manages all persistence operations for ORM objects.

Step 5 - To create/use the database mentioned in the URI, run the create_all() method. Id = db.Column( 'student_id', db.Integer, primary_key = True)ĭef _init_ (self, name, city, addr,pin):

FLASK SQLITE SAMPLE CODE

Step 4 - then use the application object as a parameter to create an object of class SQLAlchemy.The object contains an auxiliary function for the ORM operation.It also provides a parent Model class that uses it to declare a user-defined model.In the code snippet below, the studients model is created. 1Īpp.config = 'sqlite:///students.sqlite3' Step 3 - Now create a Flask application object and set the URI for the database to use. Step 2 - You need to import the SQLAlchemy class from this module.

FLASK SQLITE SAMPLE INSTALL

Step 1 - Install the Flask-SQLAlchemy extension. In this section, we will study the ORM technology of Flask-SQLAlchemy and build a small web application. The ORM API provides a way to perform CRUD operations without writing raw SQL statements. Object-relational mapping is a technique that maps object parameters to the structure of a layer RDBMS table.

the data in the RDBMS server is stored in tables.

Most programming language platforms are object-oriented.

ORM is short for Object Relation Mapping (sometimes Object Relationship Mapping). Related course: Python Flask: Create Web Apps with Flask What is ORM?

FLASK SQLITE SAMPLE FULL

Instead, SQLAlchemy, the Python Toolkit is a powerful OR Mapper, which provides application developers with the full functionality and flexibility of SQL.įlask-SQLAlchemy is a Flask extension that adds support for SQLAlchemy to the Flask application. Return render_template( 'list.Using raw SQL in the Flask Web application to perform CRUD operations on the database can be cumbersome. Return render_template( 'result.html',msg = list (): 1įrom flask import Flask, render_template, request The following is the complete code for the Flask-SQLite application. Return render_template( 'list.html',rows = rows)įinally, the ‘/‘ URL rule renders ‘home.html’, which is the entry point of the application. The application contains another list () function represented by the ‘/list’ URL.It populates’rows’ as a Multidict object that contains all records in the student table.This object is passed to the list.html template. The HTML script for result.html contains an escape statement, which displays the result of the Insert operation. Return render_template( 'result.html',msg = msg) = )Ĭur.execute( 'INSERT INTO students (name,addr,city,pin) The addrec () function retrieves the form’s data through the POST method and inserts the student table.The message corresponding to the success or error in the insert operation will be rendered as ‘result.html’.

new_student ():Īs can be seen, the form data is published to the ‘/addrec’ URL of the binding addrec () function. The first new_student() function is bound to a URL rule ( '/enternew').It presents an HTML file that contains a student information form. Our Flask application has three View functions. 1Ĭonn.execute( 'CREATE TABLE students (name TEXT, addr TEXT, city TEXT, pin TEXT)') The program creates a SQLite database ‘database.db ‘ where the student tables are created. You can create an SQLite database from Python code. The SQLite database storse all data in a single file. Related course: Python Flask: Create Web Apps with Flask Create database and table

Each database can have tables and each table can have records. SQLite is a relational database system that uses the SQL query language to interact with the database. W the Flask application interacts with SQLite. The SQlite3 module comes with the Python release.

Flask sqlite sample