Case Insensitive Flask-SQLAlchemy Query

Case Insensitive Flask-SQLAlchemy Query

In Flask-SQLAlchemy, if you want to perform case-insensitive queries on text columns, you can use the ilike operator provided by SQLAlchemy, which matches text columns in a case-insensitive manner. Here's how you can use it:

Assuming you have a SQLAlchemy model like this:

from flask_sqlalchemy import SQLAlchemy db = SQLAlchemy() class User(db.Model): id = db.Column(db.Integer, primary_key=True) username = db.Column(db.String(80), unique=True, nullable=False) email = db.Column(db.String(120), unique=True, nullable=False)

You can perform a case-insensitive query to retrieve users by username or email like this:

from your_flask_app import app, db from your_flask_app.models import User # To find a user by username (case-insensitive) username = "JohnDoe" user = User.query.filter(User.username.ilike(username)).first() # To find a user by email (case-insensitive) email = "john@example.com" user = User.query.filter(User.email.ilike(email)).first()

In the code above, we use the ilike operator with the filter() method to perform a case-insensitive search. The ilike method is equivalent to the LIKE operator in SQL, but it performs a case-insensitive comparison.

This allows you to find records in a case-insensitive manner when querying your Flask-SQLAlchemy database.

Examples

  1. Case Insensitive Search in Flask-SQLAlchemy:

    • Description: Perform a case-insensitive search using Flask-SQLAlchemy's query capabilities.
    from sqlalchemy import func from your_module import YourModel query_result = YourModel.query.filter(func.lower(YourModel.column_name).contains(search_term.lower())).all()

  2. Case Insensitive Query with ILIKE:

    • Description: Utilize ILIKE operator in SQLAlchemy for case-insensitive search.
    from your_module import YourModel query_result = YourModel.query.filter(YourModel.column_name.ilike(f"%{search_term}%")).all()

  3. Case Insensitive Search Using COLLATE:

    • Description: Implement case-insensitive search using COLLATE in SQLAlchemy.
    from your_module import YourModel query_result = YourModel.query.filter(YourModel.column_name.collate('utf8_general_ci').contains(search_term)).all()

  4. Combining ILIKE and func.lower():

    • Description: Combine ILIKE and func.lower() for a concise case-insensitive search.
    from sqlalchemy import func from your_module import YourModel query_result = YourModel.query.filter(func.lower(YourModel.column_name).like(f"%{search_term.lower()}%")).all()

  5. Using lower() in Python:

    • Description: Convert search term to lowercase before querying.
    from your_module import YourModel search_term = search_term.lower() query_result = YourModel.query.filter(YourModel.column_name.contains(search_term)).all()

  6. Custom Case Insensitive Function:

    • Description: Define a custom function for case-insensitive search.
    from sqlalchemy import func from your_module import YourModel def case_insensitive_search(column, search_term): return YourModel.query.filter(func.lower(column).contains(search_term.lower())).all() query_result = case_insensitive_search(YourModel.column_name, search_term)

  7. Using ILIKE with Wildcards:

    • Description: Incorporate ILIKE with wildcard characters for flexible matching.
    from your_module import YourModel query_result = YourModel.query.filter(YourModel.column_name.ilike(f"%{search_term}%")).all()

  8. Case Insensitive Search with REGEXP:

    • Description: Implement case-insensitive search using REGEXP in SQLAlchemy.
    from sqlalchemy import func from your_module import YourModel query_result = YourModel.query.filter(func.lower(YourModel.column_name).op('~*')(f'.*{search_term.lower()}.*')).all()

  9. Using CITEXT Extension:

    • Description: Utilize CITEXT extension for case-insensitive text comparison.
    from sqlalchemy.dialects.postgresql import CIText from your_module import YourModel query_result = YourModel.query.filter(YourModel.column_name.cast(CIText).contains(search_term)).all()

  10. Combining ILIKE and lower() in Postgres:

    • Description: Combine ILIKE with lower() for case-insensitive search in PostgreSQL.
    from your_module import YourModel query_result = YourModel.query.filter(YourModel.column_name.ilike(f"%{search_term.lower()}%")).all()

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