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added CRUD examples
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‎python/CRUD-examples/README.md‎

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The scripts in this directory follow the [BASIC CRUD OPERATIONS USING CX_ORACLE](https://learncodeshare.net/2015/06/02/basic-crud-operations-using-cx_oracle/) tutorial found on [LearnCodeShare.net](LearnCodeShare.net).

‎python/CRUD-examples/createDBObjects.sql‎

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#code Sample from the tutorial at https://learncodeshare.net/2015/06/02/basic-crud-operations-using-cx_oracle/
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#The following creates and populates the tables used for the tutorial
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CREATE TABLE lcs_people (
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id NUMBER GENERATED BY DEFAULT AS identity,
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name VARCHAR2(20),
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age NUMBER,
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notes VARCHAR2(100)
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)
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/
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ALTER TABLE LCS_PEOPLE
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ADD CONSTRAINT PK_LCS_PEOPLE PRIMARY KEY ("ID")
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/
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CREATE TABLE LCS_PETS (
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id NUMBER GENERATED BY DEFAULT AS IDENTITY,
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name VARCHAR2(20),
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owner NUMBER,
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type VARCHAR2(100)
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)
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/
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ALTER TABLE LCS_PETS ADD CONSTRAINT PK_LCS_PETS PRIMARY KEY ("ID")
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/
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ALTER TABLE LCS_PETS ADD CONSTRAINT FK_LCS_PETS_OWNER FOREIGN KEY ("OWNER") REFERENCES "LCS_PEOPLE" ("ID")
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/
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INSERT INTO lcs_people (name, age, notes)
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VALUES ('Bob', 35, 'I like dogs')
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/
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INSERT INTO lcs_people (name, age, notes)
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VALUES ('Kim', 27, 'I like birds')
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/
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INSERT INTO lcs_pets (name, owner, type)
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VALUES ('Duke', 1, 'dog')
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/
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INSERT INTO lcs_pets (name, owner, type)
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VALUES ('Pepe', 2, 'bird')
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/
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COMMIT
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/

‎python/CRUD-examples/delete/extra_fun_1.py‎

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#Code Sample from the tutorial at https://learncodeshare.net/2015/07/09/delete-crud-using-cx_oracle/
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# section titled "Extra Fun 1"
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#Using the base template, the example code executes a simple delete using named bind variables.
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import cx_Oracle
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import os
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connectString = os.getenv('db_connect')
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con = cx_Oracle.connect(connectString)
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def get_all_rows(label, data_type='people'):
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# Query all rows
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cur = con.cursor()
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if (data_type == 'pets'):
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statement = 'select id, name, owner, type from lcs_pets order by owner, id'
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else:
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statement = 'select id, name, age, notes from lcs_people order by id'
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cur.execute(statement)
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res = cur.fetchall()
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print(label + ': ')
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print (res)
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print(' ')
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cur.close()
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get_all_rows('Original Data', 'pets')
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cur = con.cursor()
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statement = 'delete from lcs_pets where type = :type'
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cur.execute(statement, {'type':'bird'})
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con.commit()
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get_all_rows('New Data', 'pets')

‎python/CRUD-examples/delete/extra_fun_2.py‎

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#Code Sample from the tutorial at https://learncodeshare.net/2015/07/09/delete-crud-using-cx_oracle/
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# section titled "Extra Fun 2"
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#Using the base template, the example code executes two simple deletes using named bind variables.
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# The child records are removed, followed by the parent record.
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import cx_Oracle
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import os
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connectString = os.getenv('db_connect')
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con = cx_Oracle.connect(connectString)
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def get_all_rows(label, data_type='people'):
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# Query all rows
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cur = con.cursor()
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if (data_type == 'pets'):
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statement = 'select id, name, owner, type from lcs_pets order by owner, id'
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else:
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statement = 'select id, name, age, notes from lcs_people order by id'
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cur.execute(statement)
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res = cur.fetchall()
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print(label + ': ')
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print (res)
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print(' ')
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cur.close()
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get_all_rows('Original People Data', 'people')
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get_all_rows('Original Pet Data', 'pets')
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cur = con.cursor()
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statement = 'delete from lcs_pets where owner = :owner'
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cur.execute(statement, {'owner':5})
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statement = 'delete from lcs_people where id = :id'
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cur.execute(statement, {'id':5})
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con.commit()
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get_all_rows('New People Data', 'people')
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get_all_rows('New Pet Data', 'pets')

‎python/CRUD-examples/delete/foreign_keys.py‎

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#Code Sample from the tutorial at https://learncodeshare.net/2015/07/09/delete-crud-using-cx_oracle/
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# section titled "Deleting records referenced by Foreign Keys" 1st example
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#Using the base template, the example code executes a simple delete using named bind variables.
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# When following the tutorial with default data this section intentionally throws an error
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# to demonstrate foreign key functionality.
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import cx_Oracle
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import os
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connectString = os.getenv('db_connect')
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con = cx_Oracle.connect(connectString)
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def get_all_rows(label, data_type='people'):
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# Query all rows
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cur = con.cursor()
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if (data_type == 'pets'):
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statement = 'select id, name, owner, type from lcs_pets order by owner, id'
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else:
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statement = 'select id, name, age, notes from lcs_people order by id'
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cur.execute(statement)
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res = cur.fetchall()
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print(label + ': ')
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print (res)
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print(' ')
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cur.close()
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get_all_rows('Original People Data', 'people')
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get_all_rows('Original Pet Data', 'pets')
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cur = con.cursor()
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statement = 'delete from lcs_people where id = :id'
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cur.execute(statement, {'id':1})
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con.commit()
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get_all_rows('New People Data', 'people')
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get_all_rows('New Pet Data', 'pets')

‎python/CRUD-examples/delete/handle_pets.py‎

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#Code Sample from the tutorial at https://learncodeshare.net/2015/07/09/delete-crud-using-cx_oracle/
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# section titled "Deleting records referenced by Foreign Keys" 2nd example
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#Using the base template, the example code executes two simple deletes using named bind variables.
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# The child records are removed, followed by the parent record.
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import cx_Oracle
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import os
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connectString = os.getenv('db_connect')
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con = cx_Oracle.connect(connectString)
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def get_all_rows(label, data_type='people'):
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# Query all rows
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cur = con.cursor()
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if (data_type == 'pets'):
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statement = 'select id, name, owner, type from lcs_pets order by owner, id'
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else:
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statement = 'select id, name, age, notes from lcs_people order by id'
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cur.execute(statement)
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res = cur.fetchall()
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print(label + ': ')
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print (res)
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print(' ')
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cur.close()
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get_all_rows('Original People Data', 'people')
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get_all_rows('Original Pet Data', 'pets')
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cur = con.cursor()
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statement = 'update lcs_pets set owner = :1 where owner = :2'
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cur.execute(statement, (2, 1))
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statement = 'delete from lcs_people where id = :id'
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cur.execute(statement, {'id':1})
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con.commit()
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get_all_rows('New People Data', 'people')
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get_all_rows('New Pet Data', 'pets')

‎python/CRUD-examples/delete/reset_data.py‎

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#Code Sample from the tutorial at https://learncodeshare.net/2015/07/09/delete-crud-using-cx_oracle/
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# section titled "Resetting the data"
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#The following resets the data for use with the update section
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#For both tables:
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# Table data is removed.
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# The identity column is set to start with the id after the starting data.
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# Using the executemany function an array of starting data is inserted into the table.
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import cx_Oracle
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import os
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connectString = os.getenv('db_connect')
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con = cx_Oracle.connect(connectString)
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cur = con.cursor()
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# Delete rows
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statement = 'delete from lcs_pets'
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cur.execute(statement)
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# Reset Identity Coulmn
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statement = 'alter table lcs_pets modify id generated BY DEFAULT as identity (START WITH 8)'
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cur.execute(statement)
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# Delete rows
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statement = 'delete from lcs_people'
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cur.execute(statement)
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# Reset Identity Coulmn
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statement = 'alter table lcs_people modify id generated BY DEFAULT as identity (START WITH 8)'
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cur.execute(statement)
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# Insert default rows
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rows = [(1, 'Bob', 35, 'I like dogs'),
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(2, 'Kim', 27, 'I like birds'),
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(3, 'Cheryl', 23, 'I like horses'),
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(4, 'Bob', 27, 'I like rabbits'),
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(5, 'Stacey', 45, 'I like snakes'),
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(6, 'Pete', 23, 'I like cats'),
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(7, 'Pat', 36, 'I like dogs')]
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cur.bindarraysize = 2
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cur.setinputsizes(int, 20, int, 100)
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cur.executemany("insert into lcs_people(id, name, age, notes) values (:1, :2, :3, :4)", rows)
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con.commit()
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# Insert default rows
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rows = [(1, 'Duke', 1, 'dog'),
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(2, 'Dragon', 2, 'bird'),
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(3, 'Sneaky', 5, 'snake'),
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(4, 'Red', 2, 'bird'),
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(5, 'Red', 3, 'horse'),
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(6, 'Buster', 1, 'dog'),
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(7, 'Fido', 7, 'cat')]
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cur.bindarraysize = 2
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cur.setinputsizes(int, 20, int, 100)
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cur.executemany("insert into lcs_pets (id, name, owner, type) values (:1, :2, :3, :4)", rows)
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con.commit()
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cur.close()

‎python/CRUD-examples/delete/simple.py‎

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#Code Sample from the tutorial at https://learncodeshare.net/2015/07/09/delete-crud-using-cx_oracle/
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# section titled "Simple delete"
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#Using the base template, the example code executes a simple delete using named bind variables.
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import cx_Oracle
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import os
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connectString = os.getenv('db_connect')
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con = cx_Oracle.connect(connectString)
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def get_all_rows(label, data_type='people'):
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# Query all rows
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cur = con.cursor()
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if (data_type == 'pets'):
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statement = 'select id, name, owner, type from lcs_pets order by owner, id'
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else:
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statement = 'select id, name, age, notes from lcs_people order by id'
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cur.execute(statement)
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res = cur.fetchall()
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print(label + ': ')
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print (res)
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print(' ')
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cur.close()
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get_all_rows('Original Data', 'pets')
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cur = con.cursor()
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statement = 'delete from lcs_pets where id = :id'
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cur.execute(statement, {'id':1})
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con.commit()
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get_all_rows('New Data', 'pets')

‎python/CRUD-examples/delete/template.py‎

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#Code Sample from the tutorial at https://learncodeshare.net/2015/07/09/delete-crud-using-cx_oracle/
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# section titled "Boilerplate template"
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#The following code is used as the base template for the other examples.
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import cx_Oracle
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import os
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connectString = os.getenv('db_connect')
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con = cx_Oracle.connect(connectString)
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def get_all_rows(label, data_type='people'):
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# Query all rows
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cur = con.cursor()
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if (data_type == 'pets'):
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statement = 'select id, name, owner, type from lcs_pets order by owner, id'
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else:
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statement = 'select id, name, age, notes from lcs_people order by id'
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cur.execute(statement)
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res = cur.fetchall()
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print(label + ': ')
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print (res)
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print(' ')
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cur.close()
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get_all_rows('Original Data', 'pets')
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# Your code here
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get_all_rows('New Data', 'pets')

‎python/CRUD-examples/dropDBObjects.sql‎

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#code Sample from the tutorial at https://learncodeshare.net/2015/06/02/basic-crud-operations-using-cx_oracle/
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#The following drops the tables created for the tutorial
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drop table CX_PETS
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/
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drop table CX_PEOPLE
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/

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