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Making Relational Cool Again (or: JavaScript on...
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Tim Griesser
May 27, 2015
Technology
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410
Making Relational Cool Again (or: JavaScript on ACID)
JSConf 2015
Tim Griesser
May 27, 2015
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Transcript
Making Relational Cool Again @tgriesser
Making Relational Cool Again @tgriesser or: JavaScript on ACID
sequel
SQL
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Functional, (prototypal) OO Loose, duck Static, strong Declarative, Procedural
Operators? + -
Operators? 0.1 + 0.2 // 0.30000000000000004
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–Me “Languages that will probably never die.”
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42-
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–Matthew Daly, Stack Overflow User “A degree of antipathy toward
relational databases”
“Poorly supported compared to non- relational databases” –Matthew Daly, Stack
Overflow User
node- node- node- node- mysql postgres mariasql sqlite3
Existing SQL Libs? Common DBAPI? Higher level abstractions
Existing SQL Libs? Database specific Mix of ORM layer and
query layer No transaction api!! "Jack of All Trades" DIY: gets you most of the way there, but…
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Query builder Eloquent Promises Models, Collections, Events
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Connection Pooling Grammar Schema (DDL) Builder Migrations Seeding Expression Builder
DB Client Transactions
Simple Configuration
Simple Configuration WebSQL
Simple Configuration WebSQL
SQL, as you would write it
Joins
Joins with multiple clauses
Subqueries
Subqueries
Other Builder Features • Raw queries • Aggregate queries (min,
max, sum) • Column, subquery aliasing ".as()" • Normalizes missing data in inserts • Tries hard to not let you screw up
…or: JavaScript on ACID
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Atomicity Consistency Isolation Durability
Transactions Snapshot state of the world Ability to ROLLBACK Prevent
others from altering data as you’re working with it (Locks) A little trickier to pull off in Node
1. Register a user, giving them an ID 2. Send
that to a third party service, registering the user 3. Create additional account rows 4. Return response to the user
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1. Register a user, giving them an ID 2. Send
that to a third party service, registering the user catch, rollback 1 3. Create additional account rows catch, rollback 1, 3? 4. Return response to the user
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Nesting Transactions SAVEPOINT ROLLBACK TO _____
"Batteries Included" • Pooling • Schema Building • Migrations •
Seeding • Callbacks (.asCallback) • Streams (.pipe, .stream) • Events • .toString()
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Object Relational Mapper
Object Relational Mapper • Takes care of standard SQL queries
for you, especially for common CRUD operations • model.fetch() • model.fetchAll() • model.save() • model.destroy()
• One-To-One • hasOne • belongsTo • One-To-Many • hasMany
• Many-To-Many • belongsToMany Association Types
• One-To-One • hasOne • belongsTo • One-To-Many • hasMany
• Many-To-Many • belongsToMany Association Types
• One-To-One • hasOne • belongsTo • One-To-Many • hasMany
• Many-To-Many • belongsToMany Association Types
• Mapping a single model to multiple model types •
Picture for employees, for products Polymorphic Associations
Builds on Knex
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Eager Loading • Avoids the N+1 Query Problem • Find
an account with associated posts, the comments on those posts, and the accounts that made the comments.
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Eager Loading • Avoids the N+1 Query Problem • Find
an account with "approved" associated posts, the comments on those posts, and the accounts that made the comments.
Dynamically constrain relations
Eager Loading
"Tapping into" the query chain Allows for adding additional query
parameters dynamically to the model's query
Transactions In Bookshelf, each async call (fetch, save, create, load,
destroy), takes an “options” object which may optionally take a {transacting: t} - where “t” is the object in the transaction closure
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Shared models: Sounds great, not as great in practice
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…not the first to do this
…not the last to do this
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Just some of what's out there…
…this still isn't enough
Don't Reinvent the wheel
Don't Reinvent the wheel
! Reinvent the wheel
! Reinvent the wheel*
! Reinvent the wheel* * just not on the client
side…
! Reinvent the wheel* * just not on the client
side…
! Reinvent the wheel
Take a look at other libraries
Take a look at other languages
Node: a target for traditional "CRUD" web applications
Thanks! @tgriesser