Flask sqlalchemy query with keyword as variable

Flask sqlalchemy query with keyword as variable

In Flask-SQLAlchemy, you can use variables to construct queries with keywords dynamically. Here's an example of how to do this:

Assuming you have a SQLAlchemy model defined, such as:

from flask_sqlalchemy import SQLAlchemy db = SQLAlchemy() class Product(db.Model): id = db.Column(db.Integer, primary_key=True) name = db.Column(db.String(128)) description = db.Column(db.Text)

You can create a dynamic query based on a variable keyword like this:

from flask import Flask, request from flask_sqlalchemy import SQLAlchemy app = Flask(__name__) app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///your_database.db' db = SQLAlchemy(app) @app.route('/search') def search(): keyword = request.args.get('keyword') if keyword: # You can use the `filter` method to construct a dynamic query results = Product.query.filter( (Product.name.ilike(f"%{keyword}%")) | (Product.description.ilike(f"%{keyword}%")) ).all() else: results = [] # Process and display the results return render_template('search_results.html', results=results) if __name__ == '__main__': app.run()

In this example, we use the ilike method, which performs a case-insensitive search, and the % wildcard to search for records containing the keyword within the name or description fields. If keyword is provided in the query string, it will be used in the search; otherwise, all records are returned.

Remember to replace 'sqlite:///your_database.db' with the actual database URL you are using.

This code assumes you have a route /search where you can provide the keyword as a query parameter. Depending on your application's structure, you can adapt this code to your specific use case.

Examples

  1. Using keyword as a variable in Flask-SQLAlchemy query: Description: This query demonstrates how to use a variable as a keyword argument in a Flask-SQLAlchemy query.

    # Example code: from your_app.models import YourModel # Assuming 'column_name' and 'search_value' are variables results = YourModel.query.filter_by(**{column_name: search_value}).all()

  2. Dynamic column selection in Flask-SQLAlchemy query: Description: You can dynamically specify column names in a Flask-SQLAlchemy query by using variables.

    # Example code: from your_app.models import YourModel # Assuming 'column_name' is a variable results = YourModel.query.with_entities(getattr(YourModel, column_name)).all()

  3. Using a variable as a column name in Flask-SQLAlchemy filter condition: Description: This query illustrates how to use a variable as a column name in the filter condition of a Flask-SQLAlchemy query.

    # Example code: from your_app.models import YourModel # Assuming 'column_name' and 'search_value' are variables results = YourModel.query.filter(getattr(YourModel, column_name) == search_value).all()

  4. Dynamic column selection with filter condition in Flask-SQLAlchemy query: Description: You can dynamically select columns and apply filter conditions based on variables in Flask-SQLAlchemy queries.

    # Example code: from your_app.models import YourModel # Assuming 'column_name' and 'search_value' are variables results = YourModel.query.with_entities(getattr(YourModel, column_name)).filter(getattr(YourModel, column_name) == search_value).all()

  5. Using a variable to specify column names and values in a Flask-SQLAlchemy filter condition: Description: This query demonstrates how to use variables to specify both column names and values in a Flask-SQLAlchemy filter condition.

    # Example code: from your_app.models import YourModel # Assuming 'column_name' and 'search_value' are variables results = YourModel.query.filter_by(**{column_name: search_value}).all()

  6. Dynamic column selection with filter condition using variable in Flask-SQLAlchemy query: Description: Another example of dynamically selecting columns and applying a filter condition based on a variable in a Flask-SQLAlchemy query.

    # Example code: from your_app.models import YourModel # Assuming 'column_name' and 'search_value' are variables results = YourModel.query.with_entities(getattr(YourModel, column_name)).filter(getattr(YourModel, column_name) == search_value).all()

  7. Applying a filter condition with a variable as a column name in Flask-SQLAlchemy query: Description: Learn how to apply a filter condition using a variable as a column name in a Flask-SQLAlchemy query.

    # Example code: from your_app.models import YourModel # Assuming 'column_name' and 'search_value' are variables results = YourModel.query.filter(getattr(YourModel, column_name) == search_value).all()

  8. Using variables to specify column names in a Flask-SQLAlchemy query: Description: Explore how to use variables to specify column names dynamically in a Flask-SQLAlchemy query.

    # Example code: from your_app.models import YourModel # Assuming 'column_name' is a variable results = YourModel.query.with_entities(getattr(YourModel, column_name)).all()

  9. Dynamic keyword arguments in a Flask-SQLAlchemy query: Description: Understand how to use dynamic keyword arguments in a Flask-SQLAlchemy query to specify column names and values.

    # Example code: from your_app.models import YourModel # Assuming 'column_name' and 'search_value' are variables results = YourModel.query.filter_by(**{column_name: search_value}).all()

  10. Passing variables as keyword arguments in a Flask-SQLAlchemy query: Description: This query demonstrates how to pass variables as keyword arguments in a Flask-SQLAlchemy query for specifying column names and values.

    # Example code: from your_app.models import YourModel # Assuming 'column_name' and 'search_value' are variables results = YourModel.query.filter_by(**{column_name: search_value}).all()

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