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Which method of cursor class is used to insert or update multiple rows using a single query?
- a)cursor.executeall(query, rows)
- b)cursor.execute(query, rows)
- c)cursor.executemultiple (query, rows)
- d)cursor.executemany(query, rows)
Correct answer is option 'D'. Can you explain this answer?
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Most Upvoted Answer
Which method of cursor class is used to insert or update multiple rows...
Explanation:
Understanding the method:
The method used to insert or update multiple rows using a single query in the cursor class is `cursor.executemany(query, rows)`. This method is specifically designed to efficiently handle multiple data rows in a single query execution.
How it works:
- The `executemany` method takes two parameters: the query string and a list of tuples containing the values to be inserted or updated.
- The query string should contain placeholders for the values that will be replaced by the data in the tuples.
- Each tuple in the list represents a row of data to be inserted or updated in the database.
Advantages of using `executemany`:
- Efficiency: By using `executemany`, you can reduce the number of round trips to the database, improving performance.
- Security: This method helps prevent SQL injection attacks by handling the data securely using parameterized queries.
- Convenience: It simplifies the process of inserting or updating multiple rows by allowing you to pass all the data at once.
Example:
python
import sqlite3
conn = sqlite3.connect('example.db')
cursor = conn.cursor()
data = [(1, 'Alice'), (2, 'Bob'), (3, 'Charlie')]
query = "INSERT INTO users (id, name) VALUES (?, ?)"
cursor.executemany(query, data)
conn.commit()
conn.close()
In this example, the `executemany` method is used to insert multiple rows into a SQLite database table called `users` with columns `id` and `name`. Each tuple in the `data` list represents a row of data to be inserted.
Understanding the method:
The method used to insert or update multiple rows using a single query in the cursor class is `cursor.executemany(query, rows)`. This method is specifically designed to efficiently handle multiple data rows in a single query execution.
How it works:
- The `executemany` method takes two parameters: the query string and a list of tuples containing the values to be inserted or updated.
- The query string should contain placeholders for the values that will be replaced by the data in the tuples.
- Each tuple in the list represents a row of data to be inserted or updated in the database.
Advantages of using `executemany`:
- Efficiency: By using `executemany`, you can reduce the number of round trips to the database, improving performance.
- Security: This method helps prevent SQL injection attacks by handling the data securely using parameterized queries.
- Convenience: It simplifies the process of inserting or updating multiple rows by allowing you to pass all the data at once.
Example:
python
import sqlite3
conn = sqlite3.connect('example.db')
cursor = conn.cursor()
data = [(1, 'Alice'), (2, 'Bob'), (3, 'Charlie')]
query = "INSERT INTO users (id, name) VALUES (?, ?)"
cursor.executemany(query, data)
conn.commit()
conn.close()
In this example, the `executemany` method is used to insert multiple rows into a SQLite database table called `users` with columns `id` and `name`. Each tuple in the `data` list represents a row of data to be inserted.
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Community Answer
Which method of cursor class is used to insert or update multiple rows...
Checking the options:
(A) cursor.executeall(query, rows) - It is not a method of cursor class.
(B) cursor.execute(query, rows) - It executes the given SQL statement.
(C) cursor.executemultiple (query, rows) - It is not a method of cursor class.
(D) cursor.executemany(query, rows) - It executes more than one SQL statement together.
From the options given above, the function cursor.executemany(query, rows) is used to insert or update multiple rows using a single query
So, the correct answer is (D)
(A) cursor.executeall(query, rows) - It is not a method of cursor class.
(B) cursor.execute(query, rows) - It executes the given SQL statement.
(C) cursor.executemultiple (query, rows) - It is not a method of cursor class.
(D) cursor.executemany(query, rows) - It executes more than one SQL statement together.
From the options given above, the function cursor.executemany(query, rows) is used to insert or update multiple rows using a single query
So, the correct answer is (D)
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Which method of cursor class is used to insert or update multiple rows using a single query?a)cursor.executeall(query, rows)b)cursor.execute(query, rows)c)cursor.executemultiple (query, rows)d)cursor.executemany(query, rows)Correct answer is option 'D'. Can you explain this answer?
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