Psycopg2: insert multiple rows with one query

Psycopg2: insert multiple rows with one query

To insert multiple rows with one query using psycopg2, you can use the executemany() method along with the INSERT INTO statement. The executemany() method allows you to execute a single SQL statement multiple times with different parameter sets. Here's how you can do it:

import psycopg2 # Establish a connection to your PostgreSQL database connection = psycopg2.connect( database="your_database", user="your_user", password="your_password", host="your_host", port="your_port" ) # Create a cursor object cursor = connection.cursor() # Define the INSERT INTO statement with placeholders for data insert_query = "INSERT INTO your_table_name (column1, column2, column3) VALUES (%s, %s, %s)" # Define the data to be inserted as a list of tuples data_to_insert = [ ('value1a', 'value1b', 'value1c'), ('value2a', 'value2b', 'value2c'), ('value3a', 'value3b', 'value3c') ] # Use executemany() to insert multiple rows in a single query cursor.executemany(insert_query, data_to_insert) # Commit the changes to the database connection.commit() # Close the cursor and connection cursor.close() connection.close()

In this example:

  1. Establish a connection to your PostgreSQL database.
  2. Create a cursor object to interact with the database.
  3. Define the INSERT INTO statement with placeholders for the data you want to insert.
  4. Define the data to be inserted as a list of tuples. Each tuple represents a row of data.
  5. Use the executemany() method to insert multiple rows into the table in a single query. The executemany() method iterates through the list of tuples and inserts each row.
  6. Commit the changes to the database to make the insertions permanent.
  7. Close the cursor and the database connection.

Make sure to replace "your_database", "your_user", "your_password", "your_host", "your_port", "your_table_name", "column1", "column2", and "column3" with your specific database and table details.

By using executemany(), you can efficiently insert multiple rows with a single query, reducing the overhead of executing individual INSERT statements for each row.

Examples

  1. "Psycopg2 bulk insert example" Description: This query seeks examples demonstrating how to efficiently insert multiple rows into a PostgreSQL database using Psycopg2 in Python, typically referred to as bulk insertion. Code:

    import psycopg2 # Connect to the PostgreSQL database conn = psycopg2.connect("dbname=test user=postgres password=secret") # Create a cursor object cur = conn.cursor() # Define the data to be inserted data = [ (1, 'John'), (2, 'Jane'), (3, 'Doe') ] # Execute the bulk insert query cur.executemany("INSERT INTO table_name (id, name) VALUES (%s, %s)", data) # Commit the transaction conn.commit() # Close the cursor and connection cur.close() conn.close()

  2. "Psycopg2 executemany example" Description: This query aims to find examples illustrating the usage of the executemany method in Psycopg2 for executing multiple SQL statements with varying parameters efficiently. Code:

    import psycopg2 # Connect to the PostgreSQL database conn = psycopg2.connect("dbname=test user=postgres password=secret") # Create a cursor object cur = conn.cursor() # Define the data to be inserted data = [ (1, 'John'), (2, 'Jane'), (3, 'Doe') ] # Execute multiple INSERT statements using executemany cur.executemany("INSERT INTO table_name (id, name) VALUES (%s, %s)", data) # Commit the transaction conn.commit() # Close the cursor and connection cur.close() conn.close()

  3. "Python Psycopg2 insert multiple rows at once" Description: This query seeks guidance on how to efficiently insert multiple rows simultaneously into a PostgreSQL database using Psycopg2 in Python. Code:

    import psycopg2 # Connect to the PostgreSQL database conn = psycopg2.connect("dbname=test user=postgres password=secret") # Create a cursor object cur = conn.cursor() # Define the data to be inserted data = [ (1, 'John'), (2, 'Jane'), (3, 'Doe') ] # Build the query dynamically to insert multiple rows at once query = "INSERT INTO table_name (id, name) VALUES " + ", ".join(["(%s, %s)"] * len(data)) # Execute the query with the data cur.execute(query, [item for sublist in data for item in sublist]) # Commit the transaction conn.commit() # Close the cursor and connection cur.close() conn.close()

  4. "Python Psycopg2 insert multiple rows from list" Description: This query seeks guidance on how to insert multiple rows into a PostgreSQL database using Psycopg2 in Python, with the data provided in the form of a Python list. Code:

    import psycopg2 # Connect to the PostgreSQL database conn = psycopg2.connect("dbname=test user=postgres password=secret") # Create a cursor object cur = conn.cursor() # Define the data to be inserted data = [ (1, 'John'), (2, 'Jane'), (3, 'Doe') ] # Use executemany to insert multiple rows from the list cur.executemany("INSERT INTO table_name (id, name) VALUES (%s, %s)", data) # Commit the transaction conn.commit() # Close the cursor and connection cur.close() conn.close()

More Tags

scene http-get vector flask-bootstrap uiscrollviewdelegate loopj ibm-cloud log4net-appender flask-sqlalchemy mv

More Python Questions

More Bio laboratory Calculators

More Biology Calculators

More Animal pregnancy Calculators

More Organic chemistry Calculators