postgresql - psycopg2 insert python dictionary as json

Postgresql - psycopg2 insert python dictionary as json

To insert a Python dictionary as a JSON value into a PostgreSQL table using psycopg2, you can use the json module to convert the dictionary to a JSON string before inserting it. Here's an example:

import psycopg2 import json # Your PostgreSQL connection parameters db_params = { 'dbname': 'your_database', 'user': 'your_user', 'password': 'your_password', 'host': 'your_host', 'port': 'your_port', } # Sample Python dictionary data_to_insert = { 'name': 'John Doe', 'age': 30, 'city': 'Example City', } # Convert the Python dictionary to a JSON string json_data = json.dumps(data_to_insert) # Establish a connection to the PostgreSQL database conn = psycopg2.connect(**db_params) # Create a cursor object cursor = conn.cursor() # Insert the JSON data into the PostgreSQL table query = "INSERT INTO your_table (json_column) VALUES (%s);" cursor.execute(query, (json_data,)) # Commit the transaction conn.commit() # Close the cursor and connection cursor.close() conn.close()

In this example:

  • data_to_insert is the Python dictionary that you want to insert into the PostgreSQL table.
  • json.dumps(data_to_insert) converts the dictionary to a JSON-formatted string.
  • The SQL query uses a parameterized query with %s as a placeholder for the JSON string.
  • cursor.execute(query, (json_data,)) passes the JSON string as a parameter to the query.

Replace placeholders such as your_database, your_user, your_password, your_host, your_port, your_table, and adjust the table column names according to your specific database and table setup.

Make sure to handle exceptions and errors appropriately in a real-world scenario, and consider using a context manager (with statement) to manage the connection and cursor for better resource management.

Examples

  1. Insert Python Dictionary as JSON Using Psycopg2

    # Insert Python dictionary as JSON using psycopg2 import psycopg2 import json conn = psycopg2.connect("dbname=your_database user=your_user password=your_password") cursor = conn.cursor() data = {'key1': 'value1', 'key2': 'value2'} json_data = json.dumps(data) cursor.execute("INSERT INTO your_table (json_column) VALUES (%s)", (json_data,)) conn.commit() cursor.close() conn.close()

    Description: Use the json.dumps function to convert a Python dictionary to a JSON string and insert it into a PostgreSQL JSON column using Psycopg2.

  2. Insert Python Dictionary as JSONB Using Psycopg2

    # Insert Python dictionary as JSONB using psycopg2 import psycopg2 import json conn = psycopg2.connect("dbname=your_database user=your_user password=your_password") cursor = conn.cursor() data = {'key1': 'value1', 'key2': 'value2'} jsonb_data = json.dumps(data) cursor.execute("INSERT INTO your_table (jsonb_column) VALUES (%s::jsonb)", (jsonb_data,)) conn.commit() cursor.close() conn.close()

    Description: Insert a Python dictionary as JSONB into a PostgreSQL JSONB column using Psycopg2 by explicitly casting the JSON string.

  3. Insert Python Dictionary as JSON Using Named Placeholder

    # Insert Python dictionary as JSON using named placeholder import psycopg2 import json conn = psycopg2.connect("dbname=your_database user=your_user password=your_password") cursor = conn.cursor() data = {'key1': 'value1', 'key2': 'value2'} json_data = json.dumps(data) cursor.execute("INSERT INTO your_table (json_column) VALUES (%(json_data)s)", {'json_data': json_data}) conn.commit() cursor.close() conn.close()

    Description: Use a named placeholder to insert a Python dictionary as JSON into a PostgreSQL JSON column using Psycopg2.

  4. Insert Python Dictionary as JSON Using SQL String Formatting

    # Insert Python dictionary as JSON using SQL string formatting import psycopg2 import json conn = psycopg2.connect("dbname=your_database user=your_user password=your_password") cursor = conn.cursor() data = {'key1': 'value1', 'key2': 'value2'} json_data = json.dumps(data) sql = "INSERT INTO your_table (json_column) VALUES (%s)" % psycopg2.extensions.QuotedString(json_data).getquoted() cursor.execute(sql) conn.commit() cursor.close() conn.close()

    Description: Use SQL string formatting to insert a Python dictionary as JSON into a PostgreSQL JSON column using Psycopg2.

  5. Insert Python Dictionary as JSONB Using SQL String Formatting

    # Insert Python dictionary as JSONB using SQL string formatting import psycopg2 import json conn = psycopg2.connect("dbname=your_database user=your_user password=your_password") cursor = conn.cursor() data = {'key1': 'value1', 'key2': 'value2'} jsonb_data = json.dumps(data) sql = "INSERT INTO your_table (jsonb_column) VALUES (%s::jsonb)" % psycopg2.extensions.QuotedString(jsonb_data).getquoted() cursor.execute(sql) conn.commit() cursor.close() conn.close()

    Description: Use SQL string formatting to insert a Python dictionary as JSONB into a PostgreSQL JSONB column using Psycopg2.

  6. Insert Python Dictionary as JSON Using execute_values

    # Insert Python dictionary as JSON using execute_values import psycopg2 from psycopg2.extras import execute_values import json conn = psycopg2.connect("dbname=your_database user=your_user password=your_password") cursor = conn.cursor() data = {'key1': 'value1', 'key2': 'value2'} json_data = json.dumps(data) execute_values(cursor, "INSERT INTO your_table (json_column) VALUES %s", [(json_data,)]) conn.commit() cursor.close() conn.close()

    Description: Use the execute_values function from Psycopg2 to insert a Python dictionary as JSON into a PostgreSQL JSON column.

  7. Insert Multiple Python Dictionaries as JSON Using executemany

    # Insert multiple Python dictionaries as JSON using executemany import psycopg2 import json conn = psycopg2.connect("dbname=your_database user=your_user password=your_password") cursor = conn.cursor() data_list = [{'key1': 'value1'}, {'key2': 'value2'}] for data in data_list: json_data = json.dumps(data) cursor.execute("INSERT INTO your_table (json_column) VALUES (%s)", (json_data,)) conn.commit() cursor.close() conn.close()

    Description: Use the executemany method to insert multiple Python dictionaries as JSON into a PostgreSQL JSON column using Psycopg2.

  8. Insert Python Dictionary as JSON Using mogrify

    # Insert Python dictionary as JSON using mogrify import psycopg2 import json conn = psycopg2.connect("dbname=your_database user=your_user password=your_password") cursor = conn.cursor() data = {'key1': 'value1', 'key2': 'value2'} json_data = json.dumps(data) cursor.execute("INSERT INTO your_table (json_column) VALUES (%s)", (psycopg2.extensions.QuotedString(json_data).getquoted(),)) conn.commit() cursor.close() conn.close()

    Description: Use the mogrify method to insert a Python dictionary as JSON into a PostgreSQL JSON column using Psycopg2.

  9. Insert Python Dictionary as JSON Using SQL Injection Prevention

    # Insert Python dictionary as JSON using SQL injection prevention import psycopg2 import json conn = psycopg2.connect("dbname=your_database user=your_user password=your_password") cursor = conn.cursor() data = {'key1': 'value1', 'key2': 'value2'} json_data = json.dumps(data) cursor.execute("INSERT INTO your_table (json_column) VALUES (%s)", [json_data]) conn.commit() cursor.close() conn.close()

    Description: Use a list with placeholders to prevent SQL injection while inserting a Python dictionary as JSON into a PostgreSQL JSON column using Psycopg2.

  10. Insert Python Dictionary as JSONB Using mogrify and Named Placeholder

    # Insert Python dictionary as JSONB using mogrify and named placeholder import psycopg2 import json conn = psycopg2.connect("dbname=your_database user=your_user password=your_password") cursor = conn.cursor() data = {'key1': 'value1', 'key2': 'value2'} jsonb_data = json.dumps(data) sql = "INSERT INTO your_table (jsonb_column) VALUES (%(jsonb_data)s::jsonb)" cursor.execute(sql, {'jsonb_data': psycopg2.extensions.QuotedString(jsonb_data).getquoted()}) conn.commit() cursor.close() conn.close()

    Description: Use mogrify with a named placeholder to insert a Python dictionary as JSONB into a PostgreSQL JSONB column using Psycopg2.

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