Rrc en 22:36 12 mar 2016

2016-03-12T22:36:47Z

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__NOTOC__
* [[:#MySQL-5 | MySQL-5.py]]

== MySQL-5.py ==

<syntaxhighlight lang="python" line="GESHI_FANCY_LINE_NUMBERS">

#!/usr/bin/python3
#-*-coding: utf-8 -*-

import mysql.connector
from mysql.connector import errorcode

config = {
'user': 'PythonClase',
'password': 'Py800se',
'host': '127.0.0.1',
'database': 'PythonClase',
'raise_on_warnings': True,
'unix_socket': '/var/lib/mysql/mysql.sock'
}

try:
Conn = mysql.connector.connect(**config)
except mysql.connector.Error as err:
if err.errno == errorcode.ER_ACCESS_DENIED_ERROR:
print( "UsuarioNombre o Contraseña incorrecto" )
elif err.errno == errorcode.ER_BAD_DB_ERROR:
print( "Base de Datos no existe" )
else:
print( err )

Cursor = Conn.cursor()

DB_NAME = 'PythonClase'

TABLES = {}
TABLES['employees'] = (
"CREATE TABLE `employees` ("
" `emp_no` int(11) NOT NULL AUTO_INCREMENT,"
" `birth_date` date NOT NULL,"
" `first_name` varchar(14) NOT NULL,"
" `last_name` varchar(16) NOT NULL,"
" `gender` enum('M','F') NOT NULL,"
" `hire_date` date NOT NULL,"
" PRIMARY KEY (`emp_no`)"
") ENGINE=InnoDB")

TABLES['departments'] = (
"CREATE TABLE `departments` ("
" `dept_no` char(4) NOT NULL,"
" `dept_name` varchar(40) NOT NULL,"
" PRIMARY KEY (`dept_no`), UNIQUE KEY `dept_name` (`dept_name`)"
") ENGINE=InnoDB")

TABLES['salaries'] = (
"CREATE TABLE `salaries` ("
" `emp_no` int(11) NOT NULL,"
" `salary` int(11) NOT NULL,"
" `from_date` date NOT NULL,"
" `to_date` date NOT NULL,"
" PRIMARY KEY (`emp_no`,`from_date`), KEY `emp_no` (`emp_no`),"
" CONSTRAINT `salaries_ibfk_1` FOREIGN KEY (`emp_no`) "
" REFERENCES `employees` (`emp_no`) ON DELETE CASCADE"
") ENGINE=InnoDB")

TABLES['dept_emp'] = (
"CREATE TABLE `dept_emp` ("
" `emp_no` int(11) NOT NULL,"
" `dept_no` char(4) NOT NULL,"
" `from_date` date NOT NULL,"
" `to_date` date NOT NULL,"
" PRIMARY KEY (`emp_no`,`dept_no`), KEY `emp_no` (`emp_no`),"
" KEY `dept_no` (`dept_no`),"
" CONSTRAINT `dept_emp_ibfk_1` FOREIGN KEY (`emp_no`) "
" REFERENCES `employees` (`emp_no`) ON DELETE CASCADE,"
" CONSTRAINT `dept_emp_ibfk_2` FOREIGN KEY (`dept_no`) "
" REFERENCES `departments` (`dept_no`) ON DELETE CASCADE"
") ENGINE=InnoDB")

TABLES['dept_manager'] = (
" CREATE TABLE `dept_manager` ("
" `dept_no` char(4) NOT NULL,"
" `emp_no` int(11) NOT NULL,"
" `from_date` date NOT NULL,"
" `to_date` date NOT NULL,"
" PRIMARY KEY (`emp_no`,`dept_no`),"
" KEY `emp_no` (`emp_no`),"
" KEY `dept_no` (`dept_no`),"
" CONSTRAINT `dept_manager_ibfk_1` FOREIGN KEY (`emp_no`) "
" REFERENCES `employees` (`emp_no`) ON DELETE CASCADE,"
" CONSTRAINT `dept_manager_ibfk_2` FOREIGN KEY (`dept_no`) "
" REFERENCES `departments` (`dept_no`) ON DELETE CASCADE"
") ENGINE=InnoDB")

TABLES['titles'] = (
"CREATE TABLE `titles` ("
" `emp_no` int(11) NOT NULL,"
" `title` varchar(50) NOT NULL,"
" `from_date` date NOT NULL,"
" `to_date` date DEFAULT NULL,"
" PRIMARY KEY (`emp_no`,`title`,`from_date`), KEY `emp_no` (`emp_no`),"
" CONSTRAINT `titles_ibfk_1` FOREIGN KEY (`emp_no`)"
" REFERENCES `employees` (`emp_no`) ON DELETE CASCADE"
") ENGINE=InnoDB")

for name, ddl in TABLES.items():
try:
print("Creating table {}: ".format(name), end='')
Cursor.execute(ddl)
except mysql.connector.Error as err:
if err.errno == errorcode.ER_TABLE_EXISTS_ERROR:
print("already exists.")
else:
print(err.msg)
else:
print("OK")

Cursor.close()
Conn.close()

</syntaxhighlight>

== Resultado ==

<pre>

[rrc@Pridd PythonClase]$ mysql -u PythonClase -pPy800se
Welcome to the MariaDB monitor. Commands end with ; or \g.
Your MariaDB connection id is 32
Server version: 10.0.22-MariaDB Mageia MariaDB Server

Copyright (c) 2000, 2015, Oracle, MariaDB Corporation Ab and others.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

MariaDB [(none)]> use PythonClase;
Database changed
MariaDB [PythonClase]> show tables
-> ;
+-----------------------+
| Tables_in_PythonClase |
+-----------------------+
| TablaDePrueba |
| departments |
| dept_emp |
| dept_manager |
| employees |
| salaries |
| titles |
+-----------------------+
7 rows in set (0.00 sec)

</pre>

Curso de Programación en Python/MySQL-5 - Historial de revisiones

Rrc en 22:36 12 mar 2016