docs: Add a getting started guide for MySQL (#1163)

Author: kyleconroy

docs/index.rst

@@ -32,7 +32,8 @@ code ever again.
    :caption: Tutorials
    :hidden:
 
-   tutorials/getting-started.md
+   tutorials/getting-started-mysql.md
+   tutorials/getting-started-postgresql.md
 
 .. toctree::
    :maxdepth: 2

docs/tutorials/getting-started-mysql.md

@@ -0,0 +1,155 @@
+# Getting started with MySQL
+
+This tutorial assumes that the latest version of sqlc is
+[installed](../overview/install.html) and ready to use.
+
+Create a new directory called `sqlc-tutorial` and open it up.
+
+Initialize a new Go module named `tutorial.sql.dev/app`
+
+```shell
+go mod init tutorial.sqlc.dev/app
+```
+
+sqlc looks for either a `sqlc.yaml` or `sqlc.json` file in the current
+directory. In our new directory, create a file named `sqlc.yaml` with the
+following contents:
+
+```yaml
+version: 1
+packages:
+  - path: "tutorial"
+    name: "tutorial"
+    engine: "mysql"
+    schema: "schema.sql"
+    queries: "query.sql"
+```
+
+sqlc needs to know your database schema and queries. In the same directory,
+create a file named `schema.sql` with the following contents:
+
+```sql
+CREATE TABLE authors (
+  id   BIGINT  NOT NULL AUTO_INCREMENT PRIMARY KEY,
+  name text    NOT NULL,
+  bio  text
+);
+```
+
+Next, create a `query.sql` file with the following four queries:
+
+```sql
+-- name: GetAuthor :one
+SELECT * FROM authors
+WHERE id = ? LIMIT 1;
+
+-- name: ListAuthors :many
+SELECT * FROM authors
+ORDER BY name;
+
+-- name: CreateAuthor :execresult
+INSERT INTO authors (
+  name, bio
+) VALUES (
+  ?, ?
+);
+
+-- name: DeleteAuthor :exec
+DELETE FROM authors
+WHERE id = ?;
+```
+
+You are now ready to generate code. Run the `generate` command. You shouldn't see any errors or output.
+
+```shell
+sqlc generate
+```
+
+You should now have a `db` package containing three files.
+
+```
+├── go.mod
+├── query.sql
+├── schema.sql
+├── sqlc.yaml
+└── tutorial
+    ├── db.go
+    ├── models.go
+    └── query.sql.go
+```
+
+You can use your newly generated queries in `app.go`.
+
+```go
+package main
+
+import (
+	"context"
+	"database/sql"
+	"log"
+	"reflect"
+
+	"tutorial.sqlc.dev/app/tutorial"
+
+	_ "github.com/go-sql-driver/mysql"
+)
+
+func run() error {
+	ctx := context.Background()
+
+	db, err := sql.Open("mysql", "user:password@/dbname")
+	if err != nil {
+		return err
+	}
+
+	queries := tutorial.New(db)
+
+	// list all authors
+	authors, err := queries.ListAuthors(ctx)
+	if err != nil {
+		return err
+	}
+	log.Println(authors)
+
+	// create an author
+	result, err := queries.CreateAuthor(ctx, tutorial.CreateAuthorParams{
+		Name: "Brian Kernighan",
+		Bio:  sql.NullString{String: "Co-author of The C Programming Language and The Go Programming Language", Valid: true},
+	})
+	if err != nil {
+		return err
+	}
+
+	insertedAuthorID, err := result.LastInsertId()
+	if err != nil {
+		return err
+	}
+	log.Println(insertedAuthorID)
+
+	// get the author we just inserted
+	fetchedAuthor, err := queries.GetAuthor(ctx, insertedAuthorID)
+	if err != nil {
+		return err
+	}
+
+	// prints true
+	log.Println(reflect.DeepEqual(insertedAuthorID, fetchedAuthor.ID))
+	return nil
+}
+
+func main() {
+	if err := run(); err != nil {
+		log.Fatal(err)
+	}
+}
+```
+
+Before the code will compile, you'll need to add the Go MySQL driver.
+
+```
+go get github.com/go-sql-driver/mysql
+go build ./...
+```
+
+To make that possible, sqlc generates readable, **idiomatic** Go code that you
+otherwise would have had to write yourself. Take a look in `tutorial/query.sql.go`.

docs/tutorials/getting-started.md renamed to docs/tutorials/getting-started-postgresql.md

@@ -1,6 +1,7 @@
-# Getting started
+# Getting started with PostgreSQL 
 
-This tutorial assumes that the latest version of sqlc is installed and ready to use.
+This tutorial assumes that the latest version of sqlc is
+[installed](../overview/install.html) and ready to use.
 
 Create a new directory called `sqlc-tutorial` and open it up.
 
@@ -90,6 +91,8 @@ import (
 	"reflect"
 
 	"tutorial.sqlc.dev/app/tutorial"
+
+	_ "github.com/lib/pq"
 )
 
 func run() error {
@@ -137,5 +140,12 @@ func main() {
 }
 ```
 
+Before the code will compile, you'll need to add the Go PostgreSQL driver.
+
+```
+go get github.com/lib/pq
+go build ./...
+```
+
 To make that possible, sqlc generates readable, **idiomatic** Go code that you
 otherwise would have had to write yourself. Take a look in `tutorial/query.sql.go`.