PyConX - Python & MySQL 8.0 Document Store

5/2/2019 Python & MySQL 8.0 Document Store
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about me - http://about.me/lefred
Who am I ?
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Frédéric Descamps
@lefred
MySQL Evangelist
Hacking MySQL since 3.23
devops believer
living in Belgium 🇧🇪
http://lefred.be

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MySQL and JSON
How MySQL works with JSON
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JavaScript Object Notation (JSON)
{
"_id": "5ad5b645f88c5bb8fe3fd337",
"name": "Morris Park Bake Shop",
"grades": [
{
"date": "2014-03-03T00:00:00Z",
"grade": "A",
"score": 2
},
],
"address": {
"coord": [
-73.856077,
40.848447
],
"street": "Morris Park Ave",
"zipcode": "10462",
"building": "1007"
},
"borough": "Bronx",
"cuisine": "Bakery",
"restaurant_id": "30075445"
}
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8.0
MySQL has Native JSON Support
JSON data type since MySQL 5.7
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8.0
Stored as binary object
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8.0
Support for partial updates in MySQL 8.0
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8.0
Support for partial updates in MySQL 8.0
28 JSON functions
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8.0
... and support JSON Paths
$.address.coord[*]
$ the root of the document
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8.0
$.address.coord[*]
. path leg separator
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8.0
$.address.coord[*]
* wildcard:
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8.0
$.address.coord[*]
* wildcard:
.* all members in the object
[*] all values in the array
[prefix]**suffix path beginning with prefix and ending with suffix
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MySQL Document Store
the Solution
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Built on
the MySQL
JSON Data
type and
Proven
MySQL
Server
Technology
Provides a schema flexible JSON Document Store
No SQL required
No need to define all possible attributes, tables, etc.
Uses new X DevAPI
Can leverage generated column to extract JSON values into
materialized columns that can be indexed for fast SQL searches.
Document can be ~1GB
It's a column in a row of a table
It cannot exceed max_allowed_packet
Allows use of modern programming styles
No more embedded strings of SQL in your code
Easy to read
Also works with relational Tables
Proven MySQL Technology
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X Protocol Connectors
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X DevAPI Developed from scratch for modern development
Supports:
SQL
NoSQL - JSON documents
NoSQL - SQL tables
Uniform API across programming languages
We provide connectors for
C++, Java, .Net, Node.js, Python, PHP
working with Communities to help them supporting it too
Supported in the MySQL Shell
Full ACID support
Savepoints
Connection pools (as of 8.0.13)
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PY
JS
SQL
>
MySQL 8.0
Upgrade Checker
Auto Completion
&
Command History
Output
Formats
(table, json, tabs)
Prompt
Themes
Batch
Execution
5.7
8.0
JS
Document
Store
X dev API
SQL CLI InnoDB
Cluster
importJSON
JSJS
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Migration from MongoDB to MySQL DS
For this example, I will use the well known restaurants collection:
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Migration from MongoDB to MySQL DS
For this example, I will use the well known restaurants collection:
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Let´s query
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Let´s query
That´s too much records to show here...
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Let´s query
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Let´s query
Let´s add a limit to it
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Some more examples
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Some more examples
Let´s add a selection criteria:
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Using IN...
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Syntax slightly different than MongoDB
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Syntax slightly different than MongoDB
> db.restaurants. nd({"cuisine": "French",
"borough": { $not: /^Manhattan/} },
{"_id":0, "name": 1,"cuisine": 1, "borough": 1}).limit(2)
{ "borough" : "Queens", "cuisine" : "French",
"name" : "La Baraka Restaurant" }
{ "borough" : "Queens", "cuisine" : "French",
"name" : "Air France Lounge" }
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CRUD operations
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CRUD operations for collections
Add a document
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Add a document
collection.add({ name: 'fred', age: 42 })
.add({ name: 'dave', age: 23 })
.execute()
collection.add([
{ name: 'dimo', age: 50 },
{ name: 'kenny', age: 25 }
]).execute()
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Modify a document
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Modify a document
collection.modify('name = :name')
.bind('name', 'fred')
.set('age', 43)
.sort('name ASC')
.limit(1)
.execute()
collection.modify('name = :name')
.patch({ age: 43, active: false })
.sort('name DESC')
.limit(1)
.execute()
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Remove a document
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Remove a document
collection.remove('name = :name')
.sort('age ASC')
.limit(1)
.execute()
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MySQL Document Store Objects Summary
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All you need to know is here:
https://dev.mysql.com/doc/x-devapi-userguide/en/crud-operations-overview.html
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MySQL Connector Python
The Python connector for MySQL
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NoSQL
SQL

MySQL Connector/Python 8
GA since April 2018
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NoSQL
SQL

GA since April 2018
Maintained by Oracle
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NoSQL
SQL

GA since April 2018
Dual license
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NoSQL
SQL

GA since April 2018
Dual license
Support MySQL Server 5.5, 5.6, 5.7 and
8.0
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NoSQL
SQL

GA since April 2018
Dual license
8.0
SQL and NoSQL support
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NoSQL
SQL

GA since April 2018
Dual license
8.0
Table and JSON Document support
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NoSQL
SQL

GA since April 2018
Dual license
8.0
Table and JSON Document support
All you need to know is here: https://dev.mysql.com/doc/connector-python/en/
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MySQL Connector/Python 8 - 3 APIs
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
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MySQL Connect/Python and Django
MySQL Connector/Python includes also a mysql.connector.django module that
provides a Django back end for MySQL
DATABASES = {
'default': {
'NAME': 'user_data',
'ENGINE': 'mysql.connector.django',
'USER': 'mysql_user',
'PASSWORD': 'password',
'OPTIONS': {
'autocommit': True,
},
}
}
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MySQL Connector/Python 8 - installation
easiest, use pip:
use a MySQL repository for your distribution (fedora, ubuntu, debian, ...)
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MySQL Connector/Python 8 - installation (2)
or go to https://dev.mysql.com/downloads/connector/python/
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What time is it ?
Time to code !
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Some coding...
import mysqlx
session = mysqlx.get_session( {
'host': 'localhost', 'port': 33060,
'user': 'fred', 'password': 'fred' })
db = session.get_schema('docstore')
col = db.get_collection('all_recs')
restaurants = col. nd("cuisine='Italian'"). elds("name, cuisine, borough")
.limit(3).execute()
for restaurant in restaurants.fetch_all():
print restaurant
session.close()
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If it was not yet obvious, you can now use
MySQL without SQL !
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OK we have Document Store, CRUD and ACID
but what makes MySQL Document Store unique ?
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Challenge: list the best restaurant of each type
of food and show the top 10, with the best one
first !

don't forget that all these restaurants are just JSON documents
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NoSQL as SQL - aggregation
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import mysqlx
session = mysqlx.get_session( {
'host': 'localhost', 'port': 33060,
'user': 'fred', 'password': 'fred' })
db = session.get_schema('docstore')
col = db.get_collection('all_recs')
restaurants = col. nd("cuisine='Italian'"). elds("name, cuisine, borough")
.limit(3).execute()
for restaurant in restaurants.fetch_all():
print restaurant
result = session.sql('''WITH cte1 AS (SELECT doc->>"$.name" AS name,
doc->>"$.cuisine" AS cuisine,
(SELECT AVG(score) FROM JSON_TABLE(doc, "$.grades[*]"
COLUMNS (score INT PATH "$.score")) AS r) AS avg_score
FROM docstore.all_recs) SELECT *, RANK() OVER
(PARTITION BY cuisine ORDER BY avg_score DESC) AS `rank`
FROM cte1 ORDER BY `rank`, avg_score DESC LIMIT 10''').execute()
for restaurant in result.fetch_all():
print "%s - %s - %d " % (restaurant[0], restaurant[1], restaurant[2])
session.close()
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Output
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And back to JSON
And of course it's possible to return the result as a JSON document:
result = session.sql('''select JSON_PRETTY(JSON_ARRAYAGG(JSON_OBJECT(
"name", name, "cuisine", cuisine,
"score", avg_score)))
from (WITH cte1 AS (SELECT doc->>"$.name" AS name,
doc->>"$.cuisine" AS cuisine,
(SELECT AVG(score)
FROM JSON_TABLE(doc, "$.grades[*]"
COLUMNS (score INT PATH "$.score"))
AS r) AS avg_score
FROM docstore.all_recs) SELECT *, RANK() OVER
(PARTITION BY cuisine ORDER BY avg_score DESC)
AS `rank`
FROM cte1 ORDER BY `rank`, avg_score
DESC LIMIT 10) as t''').execute()
row = result.fetch_one()
print row[0]
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And back to JSON - output
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some extras...
The hidden part of the iceberg
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_id Every document has a unique identifier called the document ID. It can
be manually assigned when adding a document or generated and
assigned to the document automatically !
Since MySQL 8.0.11, the _id is generated by the server. To get the list
of automatically generated IDs use the
result.getGeneratedIDs() method.
The _id is made of 3 parts, all hex encoded:
prefix
timestamp when the MySQL Server instance was started
auto-increment counter
Globally unique IDs
Optimized for InnoDB storage
Examples
00005cc17b700000000000000003
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Document Store Full ACID !
It relies on the proven MySQL InnoDB´s strength & robustness:
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innodb_ ush_log_at_trx_commit = 1
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innodb_doublewrite = ON
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sync_binlog = 1
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sync_binlog = 1
transaction_isolation = REPEATABLE-READ|READ-
COMMITTED|...
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sync_binlog = 1
transaction_isolation = REPEATABLE-READ|READ-
COMMITTED|...
We do care about your data !
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What time is it now ?
Time for some more
examples !
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More fun with The Walking Dead
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Example: All Episodes of Season 1
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Example: All First Episodes of Each Season
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Example: Speed Up Episode's Name Lookup
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Example: Transaction
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Example: Do more with SQL
List the amount of episodes by season:
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Example: Do more with SQL (2)
Episode statistics for each season:
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Example: Do more with SQL (3)
Number of days between episodes:
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JSON Data validation
It's possible to have constraints between collections (or tables):
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JSON Data validation (2)
Let's see in SQL how the 2 collections look like:
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Let's add one virtual column in each collection:
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Now we can index the reference and create the constraint:
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And now even in pure NoSQL CRUD, we can see the data validation in action:
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JSON Data validation (6) - NEW 8.0.16
Since MySQL 8.0.16, CHECK constraints are now supported !
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what do I gain ?
Conclusion
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schemaless
flexible data structure
easy to start (CRUD)
Conclusion
This is the best of the two worlds in one product !
Data integrity
ACID Compliant
Transactions
SQL
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8.0
http://lefred.be/content/top-10-reasons-for-
nosql-with-mysql/
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8.0
https://www.slideshare.net/lefred.descamps/mysql-
shell-the-best-dba-tool
https://github.com/lefred/mysql-
shell-mydba
https://github.com/lefred/mysql-
shell-innotop
More with MySQL Shell & Python
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MySQL Shell Reporting Framework - 8.0.16
Now it's also possible to create user-defined reports directly in the Shell. They can be
written in Python and called the same way on every operating systems. No need for extra
libraries !
More Info:
https://dev.mysql.com/doc/mysql-shell/8.0/en/mysql-shell-reporting.html
https://mysql.wisborg.dk/2019/04/26/mysql-shell-8-0-16-built-in-reports/
https://mysql.wisborg.dk/2019/04/27/mysql-shell-8-0-16-user-defined-reports/
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Credits
Thank you Olivier Dasini for some TV Show examples:
http://dasini.net/blog/2019/04/02/mysql-json-document-store/
Thank you Jesper Wisborg Krogh for inspiration extending the MySQL Shell
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Thank you !
Any Questions ?
share your 💕 for MySQL on social media using @mysql #MySQL8isGreat
#MySQL
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PyConX - Python & MySQL 8.0 Document Store

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