LIKE query in flask, python and SQLAlchemy
When working with relational databases, it's common to search for records that match a certain pattern or contain a specific substring. In Flask Python, SQLAlchemy is a powerful ORM that can help us to easily perform such searches using the LIKE operator. In this blog post, we will explore what a LIKE query is and how to perform it using Flask Python with SQLAlchemy.
What is a LIKE Query?
A LIKE query is a type of search query used to retrieve records that match a specific pattern or contain a specific substring. The LIKE operator is used to perform this type of search. The LIKE operator is similar to the equals (=) operator, but allows the use of wildcards to match patterns.
For example, consider a database table that stores information about books in a library. The table might have a column for the book title. In this case, we might want to perform a LIKE query to retrieve all books with the word "Python" in their title.
Using LIKE Queries in Flask Python with SQLAlchemy
Now that we understand what a LIKE query is, let's see how to use it in Flask Python with SQLAlchemy. To do this, we will need to use the filter() method on the query object.
Here's an example:
from flask import Flask
from flask_sqlalchemy import SQLAlchemy
app = Flask(__name__)
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///example.db'
db = SQLAlchemy(app)
class Book(db.Model):
id = db.Column(db.Integer, primary_key=True)
title = db.Column(db.String(50))
author = db.Column(db.String(50))
books = Book.query.filter(Book.title.like('%Python%')).all()
In this example, we have defined a model for a Book table. We then use the filter() method on the query object to perform a LIKE query on the title column. The '%' character is used as a wildcard to match any characters before or after the string "Python". The all() method is used to return all the records from the result set.
We can also use the ilike() method to perform a case-insensitive LIKE query. Here's an example:
books = Book.query.filter(Book.title.ilike('%python%')).all()
In this example, we're using the ilike() method instead of the like() method to perform a case-insensitive LIKE query. The '%' character is still used as a wildcard to match any characters before or after the string "python".
Conclusion
In this blog post, we have explored what a LIKE query is and how to perform it using Flask Python with SQLAlchemy. LIKE queries are a powerful tool for searching for records that match a specific pattern or contain a specific substring. SQLAlchemy makes it easy to perform LIKE queries using the filter() method on the query object. By using LIKE queries, we can gain a deeper understanding of our data and make more informed decisions.
Happy Learning!! Happy Coding!!
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