If you change the user to postgress, it will not be authenticated successfully as follows: Connecting to the PostgreSQL database.#!/usr/bin/env python # -*- coding: utf8 -*- _version_ = '$Id: schema_pg.py 1754 08:57:52Z mn $' # export PostgreSQL schema to text # usable to compare databases that should be the same # PostgreSQL schema info: # author: Michal Niklas USAGE = 'usage: \n\t schema_pg.py connect_string \n\t\t connect string: \n\t\t\t host:database:user:password \n\t\t or for ODBC: \n\t\t\t database/user/passwd \n\t\t or (pyodbc) \n\t\t\t Driver= Server=isof-test64 Port=5435 Database=isof_stable Uid=postgres Pwd=postgres _CONN = pyodbc. The following displays error message when you change the database to a database that does not exist e.g., supplier: Connecting to the PostgreSQL database.įATAL: database "supplier" does not exist To see how it works, you can change the connection parameters in the database.ini file.įor example, if you change the host to localhosts, the program will output the following message: Connecting to the PostgreSQL database.Ĭould not translate host name "localhosts" to address: Unknown host The connect() function raises the DatabaseError exception if an error occurred. ('PostgreSQL 12.3, compiled by Visual C build 1914, 64-bit', )ĭatabase connection closed. You will see the following output: Connecting to the PostgreSQL database. To execute the connect.py file, you use the following command: python connect.py Then, create a new cursor and execute an SQL statement to get the PostgreSQL database version.Īfter that, read the result set by calling the fetchone() method of the cursor object.įinally, close the communication with the database server by calling the close() method of the cursor and connection objects. Next, create a new database connection by calling the connect() function. # close the communication with the PostgreSQLĮxcept (Exception, psycopg2.DatabaseError) as error:įirst, read database connection parameters from the database.ini file. # display the PostgreSQL database server version Print('Connecting to the PostgreSQL database.') ![]() """ Connect to the PostgreSQL database server """ The following connect() function connects to the suppliers database and prints out the PostgreSQL database version. Raise Exception('Section file'.format(section, filename)) The config() function is placed in the config.py file: #!/usr/bin/pythonĭef config(filename='database.ini', section='postgresql'): The following config() function read the database.ini file and returns connection parameters. gitignore file will be like this: database.ini ![]() gitignore file to not committing the sensitive information to the public repo like github. Notice that if you git, you need to add the database.ini to the. CONNECT POSTGRES TO PYTHON TEXT EDITOR CODEThe following shows the contents of the database.ini file: īy using the database.ini, you can change the PostgreSQL connection parameters when you move the code to the production environment without modifying the code. To make it more convenient, you can use a configuration file to store all connection parameters. Port: the port number that defaults to 5432 if it is not provided. Host: database server address e.g., localhost or an IP address. The following is the list of the connection parameters:ĭatabase: the name of the database that you want to connect. Or you can use a list of keyword arguments: conn = nnect( To call the connect() function, you specify the PostgreSQL database parameters as a connection string and pass it to the function like this: conn = nnect("dbname=suppliers user=postgres password=postgres") By using the connection object, you can create a new cursor to execute any SQL statements. The connect() function creates a new database session and returns a new instance of the connection class. ![]() To connect to the suppliers database, you use the connect() function of the psycopg2 module. CREATE DATABASE suppliers Connect to the PostgreSQL database using the psycopg2 Second, use the following statement to create a new database named suppliers in the PostgreSQL database server. Creating a REST API Backend using Node.js, Express and Postgres. CONNECT POSTGRES TO PYTHON TEXT EDITOR PASSWORD
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