How to delete rows from a table using an SQLAlchemy query without ORM?

How to delete rows from a table using an SQLAlchemy query without ORM?

To delete rows from a table using SQLAlchemy without using the ORM (Object-Relational Mapping), you can use the delete method provided by SQLAlchemy's sql.expression module. Here's how you can do it:

from sqlalchemy import create_engine, text # Create a SQLAlchemy engine to connect to your database engine = create_engine('database_connection_string') # Define the SQL DELETE statement using SQLAlchemy's text function delete_query = text("DELETE FROM your_table WHERE your_condition") # Execute the DELETE statement with engine.begin() as conn: conn.execute(delete_query)

Replace the following placeholders with your specific details:

  • 'database_connection_string': Replace this with the connection string for your database.
  • 'your_table': Replace this with the name of the table from which you want to delete rows.
  • 'your_condition': Replace this with the condition that specifies which rows to delete. For example, "id = 5" to delete rows where the id column equals 5.

Here's an example that deletes rows from a table named users where the age column is greater than 30:

from sqlalchemy import create_engine, text # Create a SQLAlchemy engine to connect to your database engine = create_engine('database_connection_string') # Define the SQL DELETE statement using SQLAlchemy's text function delete_query = text("DELETE FROM users WHERE age > :age_limit") # Execute the DELETE statement with engine.begin() as conn: conn.execute(delete_query, age_limit=30)

This code will delete rows from the users table where the age is greater than 30. Remember to replace 'database_connection_string' with your actual database connection string.

Examples

  1. How to delete specific rows from a table using SQLAlchemy query without ORM?

    • Description: This query seeks methods to delete specific rows from a table using SQLAlchemy query without using Object Relational Mapping (ORM).
    from sqlalchemy import create_engine, text # Assuming engine is your SQLAlchemy engine engine.execute(text("DELETE FROM table_name WHERE condition"))

  2. How to delete all rows from a table using SQLAlchemy query without ORM?

    • Description: This query focuses on deleting all rows from a table using SQLAlchemy query without ORM.
    from sqlalchemy import create_engine, text # Assuming engine is your SQLAlchemy engine engine.execute(text("DELETE FROM table_name"))

  3. How to delete rows from a table based on a condition using SQLAlchemy query without ORM?

    • Description: This query involves deleting rows from a table based on a condition using SQLAlchemy query without using ORM.
    from sqlalchemy import create_engine, text # Assuming engine is your SQLAlchemy engine engine.execute(text("DELETE FROM table_name WHERE column_name = :value"), {'value': value_to_match})

  4. How to delete rows from a table using SQLAlchemy query without ORM and a subquery?

    • Description: This query seeks methods to delete rows from a table using a subquery within a SQLAlchemy query without using ORM.
    from sqlalchemy import create_engine, text # Assuming engine is your SQLAlchemy engine engine.execute(text("DELETE FROM table_name WHERE id IN (SELECT id FROM subquery)"))

  5. How to delete rows from a table using SQLAlchemy query without ORM with joins?

    • Description: This query focuses on deleting rows from a table using joins within a SQLAlchemy query without using ORM.
    from sqlalchemy import create_engine, text # Assuming engine is your SQLAlchemy engine engine.execute(text("DELETE table_name FROM table_name JOIN other_table ON table_name.id = other_table.id WHERE condition"))

  6. How to delete duplicate rows from a table using SQLAlchemy query without ORM?

    • Description: This query involves deleting duplicate rows from a table using SQLAlchemy query without using ORM.
    from sqlalchemy import create_engine, text # Assuming engine is your SQLAlchemy engine engine.execute(text("DELETE t1 FROM table_name t1 JOIN table_name t2 ON t1.id < t2.id AND t1.column_name = t2.column_name"))

  7. How to delete rows from a table using SQLAlchemy query without ORM with limit?

    • Description: This query seeks methods to delete a limited number of rows from a table using SQLAlchemy query without using ORM.
    from sqlalchemy import create_engine, text # Assuming engine is your SQLAlchemy engine engine.execute(text("DELETE FROM table_name WHERE condition LIMIT 10"))

  8. How to delete rows from a table based on a subquery result using SQLAlchemy query without ORM?

    • Description: This query focuses on deleting rows from a table based on the result of a subquery using SQLAlchemy query without ORM.
    from sqlalchemy import create_engine, text # Assuming engine is your SQLAlchemy engine engine.execute(text("DELETE FROM table_name WHERE id IN (SELECT id FROM subquery_table WHERE condition)"))

  9. How to delete rows from a table using SQLAlchemy query without ORM and a correlated subquery?

    • Description: This query involves deleting rows from a table using a correlated subquery within a SQLAlchemy query without using ORM.
    from sqlalchemy import create_engine, text # Assuming engine is your SQLAlchemy engine engine.execute(text("DELETE FROM table_name t1 WHERE EXISTS (SELECT 1 FROM subquery_table t2 WHERE t1.id = t2.id AND condition)"))

  10. How to delete rows from a table using SQLAlchemy query without ORM with order by?

    • Description: This query seeks methods to delete rows from a table with ordering using SQLAlchemy query without using ORM.
    from sqlalchemy import create_engine, text # Assuming engine is your SQLAlchemy engine engine.execute(text("DELETE FROM table_name WHERE condition ORDER BY column_name DESC LIMIT 5"))

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