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Building Database Applications in Elixir with Ecto

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Introduction to This Course

Why Ecto?Course Plan

Part I: Ecto Fundamentals

Overview of Part I

Get Started with Repo

Ecto and Elixir Characteristics of Ecto Ecto Modules Set Up the Sample Application Running the Examples Data Model of the Sample Application The Repository Pattern The Repo Module Put Our Repo to Work Get Values Back Execute Queries Customize Your Repo Wrapping Up: Get Started with Repo Exercise: Customize Your Repo Module Solution: Customize Your Repo Module Quiz: Get Started with Repo

Query Your Database

Introduction to the Query Module

Refine Our Results with the Where Expression

Protect Against SQL Injection

Dynamic Values and Their Types

Combine Results with union and union_all Options

Order and Group

Work With Joins

Why Use the Composing Queries

Compose Queries with Functions

Combine Queries with or_where

Other Ways to Use Queries

Wrapping Up: Query Your Database

Exercise: Create Queries in Ecto

Solution: Create Queries in Ecto

Quiz: Query Your Database

Connect Tables to Elixir Structs with Schemas

Introduction to Schemas Create Schemas How to Write Queries with Schemas Insert with Schemas Delete with Schemas Add Associations to Schemas Many-to-Many Associations Work with Associations in Queries Optimize Associations With Embedded Schemas Delete Records With Associations Use Schemas to Seed a Database Wrapping Up: Connect Tables to Elixir Structs with Schemas Exercise: Create Schemas in Ecto Solution: Create Schemas in Ecto Quiz: Connect Tables to Elixir Structs with Schema

Make Changes with Changesets

Introduction to Changesets Cast and Filter Validate Your Data Work with Constraints Capture Errors Use Changesets Without Schemas Work with Associations Associations Using Internal Data Associations Using External Data Update Records with Associations Best Practices for Associations Wrapping Up: Make Changes with Changesets Exercise: Create Changesets in Ecto Solution: Create Changesets in Ecto Quiz: Make Changes with Changesets

Make Multiple Changes with Transactions and the Multi Module

Introduction to Transactions and the Multi Module Run Transactions with Functions Force a Rollback Within a Transaction Execute Non-Database Operations Within a Transaction Drawbacks of Using Functions Run Transactions and Capturing Errors with Ecto.Multi Optimize Multi with Changesets Execute Non-Database Operations with Multi Wrapping Up: Make Multiple Changes with Transactions Exercise: Work with Transactions and the Multi Module Solution: Work with Transactions and the Multi Module Quiz: Make Multiple Changes

Make Changes to the Database

What are Migrations?Your First Migration Run Migrations Add Indexes Change Data and Table Structure Simultaneously Specify Up and Down Operations Change Default Behaviors Change Timestamps Run Migrations Outside of a Transaction Wrapping Up: Make Changes to Your Database Exercise: Create Migrations Solution: Create Migrations Quiz: Make Changes to your Database

Part II: Ecto Applied

Overview of Part II

Add Ecto to an Elixir Application Without Phoenix

Ecto in Elixir Applications: An Introduction Create a New Project Create Your Repo Module Add Ecto to the Supervision Tree Use Multiple Ecto Repos Start Your App Wrapping Up: Add Ecto to an Elixir Application Without Phoenix Quiz: Add Ecto to an App without Phoenix

Work with Changesets and Phoenix Forms

Ecto and Phoenix Forms: An Introduction Generate a Form for a Single Schema Display Changeset Errors Create a Form with an Association Create a Form with Multiple Associations Wrapping Up: Work Changesets and Phoenix Forms Quiz: Work with Changesets and Phoenix Forms

Test with Sandboxes

Introduction to Sandboxes Set Up an Async Test Change the Ownership Mode Safely Share Connections with Allowances Wrapping Up: Test with Sandboxes Quiz: Test with Sandboxes

Create and Use Custom Types

Introduction to Custom Types in Ecto Building on Top of Ecto’s Types Adding Custom Types Without the Built-In Types Wrapping Up: Creating and Using Custom Types Quiz: Creating and Using Custom Types

Inserting and Updating with Upserts

Introduction to Upserts Perform Upserts Without Schemas Perform Upserts with Schemas Wrapping Up: Insert and Update with Upserts Exercise: Use Ecto's Upsert Feature Solution: Use Ecto's Upsert Feature Quiz: Insert and Update with Upserts

Optimizeing Your Application Design

Introduction to Optimized Application Design Separate the Pure Code from the Impure Code Work with Context Work with Umbrella Applications Wrapping Up: Optimize Your Application Design Quiz: Optimize Your Application Design

Work with Embedded Schemas

Introduction to Embedded Schemas Create Embedded Schemas Make Changes Choose Between Embedded Schemas and Associations Wrapping Up: Work with Embedded Schemas Quiz: Work with Embedded Schemas

Creating Polymorphic Associations

Introduction to Polymorphic Associations Polymorphism in Other Frameworks Approach #1: Multiple Foreign Keys Approach #2: Use an Abstract Schema Approach #3: Use many_to_many Wrapping Up: Create Polymorphic Associations Quiz: Creating Polymorphic Associations

Optimize IEx for Ecto

Introduction to Optimizing IEx for Ecto Add Imports and Aliases Add Helper Functions Wrapping Up: Optimize IEx for Ecto Quiz: Optimize IEx for Ecto

Use Schemas Without Tables

Introduction to Schemas Without Tables Schemas and Tables Create Table-less Schemas Save the Table-less Structs Wrapping Up: Use Schemas Without Tables Quiz: Use Schemas Without Tables

Tune for Performance

Introduction to Performance Tuning Optimization Execute Bulk Operations Fetch Large Datasets With Streams Wrapping Up: Tune for Performance Quiz: Tune for Performance

Conclusion

Closing Thoughts

Insert Raw SQL

Learn how to use specialized SQL functions in queries.

We'll cover the following

The fragment function

Extend Ecto’s query API

Try it yourself

The `fragment` function

Ecto’s query API gives us nearly everything we need to write even very complex queries. Still, we might have cases where our database exposes some specialized functions that Ecto doesn’t support. The fragment function gives us an escape hatch for writing bits of raw SQL that get inserted verbatim into the query.

Here, we use the fragment function so we can call the Postgres lower function.

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