Develop Python Applications with MySQL Connector/Python DEV5957
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1 Develop Python Applications with MySQL Connector/Python DEV5957 Jesper Wisborg Krogh Senior Principal Technical Support Engineer Oracle MySQL Support October 24, 2018
2 Safe Harbor Statement The following is intended to outline our general product direction. It is intended for information purposes only, and may not be incorporated into any contract. It is not a commitment to deliver any material, code, or functionality, and should not be relied upon in making purchasing decisions. The development, release, timing, and pricing of any features or functionality described for Oracle s products may change and remains at the sole discretion of Oracle Corporation.
3 Who Am I? Started to use MySQL in 2006 Been a MySQL Support engineer since 2011 Contributed to the Oracle Certified Professional exams for MySQL: MySQL 5.7 Database Administrator MySQL 5.6 Database Administrator MySQL 5.6 Developer Contributed to the MySQL sys schema Author of MySQL Connector/Python Revealed (Apress, 2018) Coauthor of Pro MySQL NDB Cluster (Apress, 2017)
4 Program Agenda What is MySQL Connector/Python? PEP249 Python Database API NoSQL + SQL the X DevAPI
5 What is MySQL Connector/Python? An overview of Support, Features, and Installation
6 MySQL Connector/Python 8 GA in April 2018 Maintained by Oracle Dual license Supports MySQL Server 5.5, 5.6, 5.7, and 8.0 SQL and NoSQL support Table and JSON Document support
7 Choice of Three APIs API Python Module Comment PEP249 Python Database API mysql.connector The traditional API C Extension API _mysql_connector Similar to the MySQL C API MySQL X DevAPI mysqlx New in 8.0, both SQL and NoSQL
8 Installing MySQL Connector/Python The Ease Choice: pip shell$ pip install mysql-connector-python Collecting mysql-connector-python Downloading 27df8a6b91e5eb9a95933f301aaac59d2af047df6/mysql_connector_python cp27-cp27mu-manylinux1_x86_64.whl (8.3MB) 100% 8.3MB 4.9MB/s Collecting protobuf>=3.0.0 (from mysql-connector-python) Downloading 05e fe8d17aa21d3c7dda811b8d01469/protobuf cp27- cp27mu-manylinux1_x86_64.whl (1.1MB) 100% 1.1MB 12.8MB/s Requirement already satisfied: setuptools in /usr/lib/python2.7/site-packages (from protobuf>=3.0.0->mysqlconnector-python) (0.9.8) Requirement already satisfied: six>=1.9 in /usr/lib/python2.7/site-packages (from protobuf>=3.0.0->mysqlconnector-python) (1.9.0) Installing collected packages: protobuf, mysql-connector-python Successfully installed mysql-connector-python protobuf
9 Installing MySQL Connector/Python MySQL Installer Great Choice on Microsoft Windows
10 Installing MySQL Connector/Python Other Choices Platform specific packages: RPM APT MySQL s Yum repository macos Platform-independent tar or zip files Source code
11 Create a Test User mysql> CREATE USER pyuser@localhost IDENTIFIED BY 'my_password'; mysql> GRANT ALL ON world.* TO pyuser@localhost; mysql> GRANT ALL ON py_test_db.* TO pyuser@localhost; [client] host = port = 3306 [connector_python] user = pyuser password = my_password The examples in this presentation are simplified. Please add the required checks in your programs, particularly check for warnings and errors.
12 PEP249 Python Database API Most Powerful for SQL
13 The Cursor Workflow Source: MySQL Connector/Python Revealed
14 Five Largest Cities in Australia import mysql.connector db = mysql.connector.connect(option_files="my.ini") cursor = db.cursor(named_tuple=true) cursor.execute(""" SELECT ID, Name, District, Population FROM world.city WHERE CountryCode = 'AUS' ORDER BY Population DESC LIMIT 5""") for row in cursor.fetchall(): print(row) cursor.close() db.close() Row(ID=130, Name='Sydney', District='New South Wales', Population= ) Row(ID=131, Name='Melbourne', District='Victoria', Population= ) Row(ID=132, Name='Brisbane', District='Queensland', Population= ) Row(ID=133, Name='Perth', District='West Australia', Population= ) Row(ID=134, Name='Adelaide', District='South Australia', Population=978100)
15 Do Not Trust User Input Never Ever! import mysql.connector user_input = "' OR TRUE;" db = mysql.connector.connect(option_files="my.ini") cursor = db.cursor(named_tuple=true) cursor.execute("select * FROM world.city WHERE Name = '{0}'".format(user_input)) rows = cursor.fetchall() for i in range(3): print(rows[i]) print("\nexecuted statement: {0}".format(cursor.statement)) print("total number of rows: {0}".format(cursor.rowcount)) cursor.close() db.close() Row(ID=1, Name='Kabul', CountryCode='AFG', District='Kabol', Population= ) Row(ID=2, Name='Qandahar', CountryCode='AFG', District='Qandahar', Population=237500) Row(ID=3, Name='Herat', CountryCode='AFG', District='Herat', Population=186800) Executed statement: SELECT * FROM world.city WHERE Name = '' OR TRUE;' Total number of rows: 4079
16 Protect Yourself Against Bad User Input Validate the input Parametrize the queries Use prepared statements Minimum privileges
17 Use Parametrization as Protection import mysql.connector user_input = "' OR TRUE;" db = mysql.connector.connect(option_files="my.ini") cursor = db.cursor(named_tuple=true) sql = "SELECT * FROM world.city WHERE Name = %(name)s" params = {'name': user_input} cursor.execute(sql, params) rows = cursor.fetchall() print("executed statement: {0}".format(cursor.statement)) print("total number of rows: {0}".format(cursor.rowcount)) cursor.close() db.close() Executed statement: SELECT * FROM world.city WHERE Name = '\' OR TRUE;' Total number of rows: 0
18 Use Prepared Statements as Protection import mysql.connector db = mysql.connector.connect(option_files="my.ini", use_pure=true) cursor = db.cursor(prepared=true) sql = "SELECT * FROM world.city WHERE Name = %s" cursor.execute(sql, ("San Francisco",)) row = cursor.fetchone() while row is not None: dict_row = dict(zip(cursor.column_names, row)) print(dict_row) row = cursor.fetchone() cursor.close() db.close() {'ID': 3805, 'Name': 'San Francisco', 'CountryCode': 'USA', 'District': 'California', 'Population': }
19 Always Check for Warnings import mysql.connector from mysql.connector.constants import SQLMode db = mysql.connector.connect(option_files="my.ini") db.get_warnings = True db.raise_on_warnings = True db.sql_mode = [SQLMode.ERROR_FOR_DIVISION_BY_ZERO, SQLMode.STRICT_TRANS_TABLES] cursor = db.cursor() cursor.execute("select 1/0") try: rows = cursor.fetchall() except mysql.connector.errors.databaseerror as e: if e.errno == mysql.connector.errorcode.er_division_by_zero: print("errno: {0.errno} - SQL State: {0.sqlstate}: {0.msg}".format(e)) print("warnings: {0}".format(cursor.fetchwarnings())) cursor.close() db.close() Errno: SQL State: None: Division by 0 Warnings: [('Warning', 1365, 'Division by 0')]
20 Other Features Stored procedures Multiple result sets Connection pool Failover
21 Tips and Tricks Use Native Methods Rather Than Queries When Changing Settings db.set_charset_collation() to change the character set/collation db.set_charset_collation(charset = "utf8mb4", collation = utf8mb4_0900_ai_ci") db.database or db.cmd_init_db() to change the default schema/database db.database = "world cmd_init_db("world") db.time_zone to change the time zone applies to timestamp columns db.time_zone = "-09:00" db.time_zone = "US/Pacific"
22 Tips and Tricks Connection Utility Methods Change the user: charset = CharacterSet.get_charset_info("utf8mb4", "utf8mb4_0900_ai_ci") db.cmd_change_user(username="root", password="password", database="world", charset=charset[0])) Check whether the connection exists: db.is_connected() db.ping(reconnect=true, attempts=5, delay=1) Reset the connection: db.cmd_reset_connection() db.reset_session(user_variables={ }, session_variables={ })
23 Tips and Tricks Get the MySQL Connector/Python and Server Version import mysql.connector conpy_version = mysql.connector. version print("mysql Connector/Python version...: {0}".format(conpy_version)) db = mysql.connector.connect(option_files="my.ini") print("server info:...: {0}".format(db.get_server_info())) server_version = db.get_server_version() print("server version...: {0}".format(server_version)) if server_version > (8, 0, 2): print("supports window functions") db.close() MySQL Connector/Python version...: Server info:...: commercial Server version...: (8, 0, 12) Supports window functions
24 Tips and Tricks Recommendations and Best Practices Use utf8mb4 as the character set Use one of the new Unicode 9.0 collations (utf8mb4_%0900_%) Give your database users minimal privileges Never ever store passwords in the source code Raise on warnings and check warnings from the get go
25 MySQL X DevAPI NoSQL + SQL = MySQL
26 The X DevAPI Developed from scratch for modern development Supports: SQL NoSQL JSON documents NoSQL SQL tables Uniform API across programming languages Supported in MySQL Shell
27 The X DevAPI Full ACID support Savepoints Connection pools (as of ) Failover
28 The MySQL Document Store
29 DEV5959 Python and the MySQL Document Store When: Today at 2:30pm Where: This room (Moscone West Room 2014) What: 45 minutes dedicated to Python and the MySQL Document Store
30 X DevAPI with SQL Tables CRUD support SQL support Supports MySQL Server 5.7 and 8.0. Source: MySQL Connector/Python Revealed
31 Create Table and Data import mysqlx import config session = mysqlx.get_session(**config.connect_args) schema = session.create_schema("py_test_db") session.sql(""" CREATE TABLE py_test_db.t1 ( id int unsigned NOT NULL auto_increment PRIMARY KEY, val varchar(10) NOT NULL)""").execute() table = schema.get_table("t1") connect_args = { "user": "pyuser", "password": "my_password", "host": " ", "port": 33060, } session.start_transaction() stmt = table.insert("val").values("abc") stmt.values("def") result = stmt.values("ghi").execute() session.commit() print("inserted {0} rows".format(result.get_affected_items_count())) print("first ID generated: {0}".format(result.get_autoincrement_value())) session.drop_schema("py_test_db") session.close() Inserted 3 rows First ID generated: 1
32 CRUD Select Statement Workflow
33 Read Data import mysqlx import config session = mysqlx.get_session(**config.connect_args) schema = session.get_schema("world") city = schema.get_table("city") result = city.select("id", "Name", "District", "Population") \.where("countrycode = :country_code") \.order_by("population DESC") \.limit(5) \.bind("country_code", "AUS") \.execute() fmt = "{ID:3d} {Name:9s} {District:15s} {Population:7d}" for row in result.fetch_all(): dict_row = {column.column_name: row[column.column_name] for column in result.columns} print(fmt.format(**dict_row)) session.close() 130 Sydney New South Wales Melbourne Victoria Brisbane Queensland Perth West Australia Adelaide South Australia
34 MySQL Shell Great for Interactive Use
35 Q & A Thanks for Attending
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