Compare · 001

Your first query: CockroachDB and MySQL

Every file of the CockroachDB and MySQL versions side by side, with the lines that differ marked. 1 parameter or column types differ in Go.

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Configuration

sgl.yamldiffers
CockroachDB
MySQL
1version: 1
1version: 1
2
2
3databases:
3databases:
4 - name: tasks
4 - name: tasks
5 dialect: cockroachdb
5 dialect: mysql
6 migrations: db/migrations
6 migrations: db/migrations
7 queries: db/queries
7 queries: db/queries
8 go:
8 go:
9 package: store
9 package: store
10 out: internal/store
10 out: internal/store

Migrations

db/migrations/0001_init.up.sqldiffers
CockroachDB
MySQL
1CREATE TABLE tasks (
1CREATE TABLE tasks (
2 id INT8 NOT NULL DEFAULT unique_rowid() PRIMARY KEY,
2 id BIGINT NOT NULL AUTO_INCREMENT PRIMARY KEY,
3 title STRING NOT NULL,
3 title VARCHAR(200) NOT NULL,
4 completed BOOL NOT NULL DEFAULT false,
4 completed INT NOT NULL DEFAULT 0,
5 created_at TIMESTAMPTZ NOT NULL DEFAULT now()
5 created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP
6);
6);
db/migrations/0001_init.down.sqlidentical
CockroachDB
MySQL
1DROP TABLE tasks;
1DROP TABLE tasks;

Queries

CreateTaskdiffers
CockroachDB · db/queries/tasks.sql
MySQL · db/queries/tasks.sql
1-- sgl.query(CreateTask, one)
1-- sgl.query(CreateTask, execresult)
2INSERT INTO tasks (title) VALUES ($1) RETURNING id, title, completed, created_at;
2INSERT INTO tasks (title) VALUES (?);
ListTasksdiffers
CockroachDB · db/queries/tasks.sql
MySQL · db/queries/tasks.sql
1-- sgl.query(ListTasks, many)
1-- sgl.query(ListTasks, many)
2SELECT id, title, completed, created_at FROM tasks ORDER BY created_at, id;
2SELECT id, title, completed, created_at FROM tasks ORDER BY id;
CompleteTaskdiffers
CockroachDB · db/queries/tasks.sql
MySQL · db/queries/tasks.sql
1-- sgl.query(CompleteTask, execrows)
1-- sgl.query(CompleteTask, execrows)
2UPDATE tasks SET completed = true WHERE id = $1;
2UPDATE tasks SET completed = 1 WHERE id = ?;

What sgl generates

CreateTaskdiffers
CockroachDB
MySQL
1func (queries *Queries) CreateTask(ctx context.Context, title string) (CreateTaskRow, error)
1func (queries *Queries) CreateTask(ctx context.Context, title string) (sql.Result, error)
2
3type CreateTaskRow struct {
4 ID int64 `json:"id"`
5 Title string `json:"title"`
6 Completed bool `json:"completed"`
7 CreatedAt time.Time `json:"created_at"`
8}
ListTasksdiffers
CockroachDB
MySQL
1func (queries *Queries) ListTasks(ctx context.Context) ([]ListTasksRow, error)
1func (queries *Queries) ListTasks(ctx context.Context) ([]ListTasksRow, error)
2
2
3type ListTasksRow struct {
3type ListTasksRow struct {
4 ID int64 `json:"id"`
4 ID int64 `json:"id"`
5 Title string `json:"title"`
5 Title string `json:"title"`
6 Completed bool `json:"completed"`
6 Completed int32 `json:"completed"`
7 CreatedAt time.Time `json:"created_at"`
7 CreatedAt time.Time `json:"created_at"`
8}
8}
CompleteTaskidentical
CockroachDB
MySQL
1func (queries *Queries) CompleteTask(ctx context.Context, id int64) (int64, error)
1func (queries *Queries) CompleteTask(ctx context.Context, id int64) (int64, error)

The program

example.godiffers
CockroachDB
MySQL
1package main
1package main
2
2
3import (
3import (
4 "context"
4 "context"
5 "database/sql"
5 "database/sql"
6 "fmt"
6 "fmt"
7 "io"
7 "io"
8
8
9 "seagull.sh/seagull/examples/cockroachdb/001_first_query/internal/store"
9 "seagull.sh/seagull/examples/mysql/001_first_query/internal/store"
10)
10)
11
11
12// run adds two tasks, completes the first and lists them all, through the methods sgl
12// run adds two tasks, completes the first and lists them all, through the methods sgl
13// generated from db/queries/tasks.sql.
13// generated from db/queries/tasks.sql.
14//
14//
15// The code is what it would be on PostgreSQL; the differences are in the database.
15// MySQL has no RETURNING, so CreateTask is execresult: it returns the driver's
16// CockroachDB fills id with unique_rowid(), a large int64 built from the time and the
16// sql.Result, and LastInsertId gives the AUTO_INCREMENT id MySQL assigned. The id column
17// node, so IDs are neither 1 and 2 nor the same from one run to the next, and the list
17// is BIGINT, so it is an int64 like LastInsertId's result and needs no conversion.
18// prints titles instead. CockroachDB uses SERIALIZABLE isolation by default and may abort
19// one with SQLSTATE 40001 when it conflicts with another. The generated RunInTx does not
20// retry, so code that uses it on CockroachDB retries the whole function itself.
21//
18//
22// Takes database (*sql.DB) which is a migrated database.
19// Takes database (*sql.DB) which is a migrated database.
23// Takes output (io.Writer) which receives the task list.
20// Takes output (io.Writer) which receives the task list.
24//
21//
25// Returns error when a query fails.
22// Returns error when a query fails.
26func run(ctx context.Context, database *sql.DB, output io.Writer) error {
23func run(ctx context.Context, database *sql.DB, output io.Writer) error {
27 queries := store.New(database)
24 queries := store.New(database)
28
25
29 feed, err := queries.CreateTask(ctx, "Feed the seagulls")
26 result, err := queries.CreateTask(ctx, "Feed the seagulls")
30 if err != nil {
27 if err != nil {
31 return fmt.Errorf("creating a task: %w", err)
28 return fmt.Errorf("creating a task: %w", err)
32 }
29 }
30 feed, err := result.LastInsertId()
31 if err != nil {
32 return fmt.Errorf("reading the new task's id: %w", err)
33 }
33 if _, err := queries.CreateTask(ctx, "Count the chips"); err != nil {
34 if _, err := queries.CreateTask(ctx, "Count the chips"); err != nil {
34 return fmt.Errorf("creating a task: %w", err)
35 return fmt.Errorf("creating a task: %w", err)
35 }
36 }
36
37
37 completed, err := queries.CompleteTask(ctx, feed.ID)
38 completed, err := queries.CompleteTask(ctx, feed)
38 if err != nil {
39 if err != nil {
39 return fmt.Errorf("completing task %d: %w", feed.ID, err)
40 return fmt.Errorf("completing task %d: %w", feed, err)
40 }
41 }
41 fmt.Fprintf(output, "completed %d task\n", completed)
42 fmt.Fprintf(output, "completed %d task\n", completed)
42
43
43 tasks, err := queries.ListTasks(ctx)
44 tasks, err := queries.ListTasks(ctx)
44 if err != nil {
45 if err != nil {
45 return fmt.Errorf("listing tasks: %w", err)
46 return fmt.Errorf("listing tasks: %w", err)
46 }
47 }
47 for _, task := range tasks {
48 for _, task := range tasks {
48 fmt.Fprintf(output, "%-18s completed=%t\n", task.Title, task.Completed)
49 fmt.Fprintf(output, "%d\t%-18s completed=%d\n", task.ID, task.Title, task.Completed)
49 }
50 }
50 return nil
51 return nil
51}
52}

Go type differences

The same SQL types map to different Go types, because each database reports them differently.

QueryFieldCockroachDBMySQL
ListTaskscolumn completedboolint32