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A Library to communicate with postgres from python

Project description

Postgres python
---------------
A simple api to read, write, delete and update in a postgres database

Installation : Linux/Mac
---------------

.. code-block:: bash

$ pip install pg_python


Server Initialization
---------------

.. code-block:: bash

$ from pg_python.pg_python import *
$ pgs = pg_server(db_name, username, password, host_address)

Schema Definition (Optional)(Not available)
---------------

.. code-block:: bash

$ schema_map = Schema()
$ pgs.add_schema(db_name, schema_map)

Read operation
---------------
Return value is a list of dictionaries.
Every dictionary is representative of the row that is fetched.
Each dictionary's key is the same as the column name fetched.


.. code-block:: bash

$ value_list = read(table_name, keys_to_get_dict, where_kv_dict, limit, order_by, order_type, operator_string)

**Parameter information :**

- keys_to_get_dict(a list of column names to fetch)
- where_kv_dict(a dictionary to specify the 'Where' clause)

**Example usage :**
print pg_python.read("mock_table", ['column2','column3'], {"column_1":'55'})
Resulting query: SELECT column2, column3 FROM mock_table WHERE column1 = %s, ['55']

Sample output: [{'column2': 'column_data_A', 'column3': 'column_data_Z'}, {'column2': 'column_data_P', 'column3': 'column_data_Q'}]

Write operation
---------------

.. code-block:: bash

$ write(table_name, kv_dict)

Overwrite operation
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.. code-block:: bash

$ write(table_name, kv_dict)

Update operation
---------------

.. code-block:: bash


$ update(table, update_kv_map, where_kv_map)

Delete operation
---------------

.. code-block:: bash


$ delete(table, where_kv_map, single_row)

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