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Your first query: MariaDB and PostgreSQL

Every file of the MariaDB and PostgreSQL versions side by side, with the lines that differ marked. 2 parameter or column types differ in Go.

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Configuration

sgl.yamldiffers
MariaDB
PostgreSQL
1version: 1
1version: 1
2
2
3databases:
3databases:
4 - name: tasks
4 - name: tasks
5 dialect: mariadb
5 dialect: postgres
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
11 driver: database/sql
12 doc_comments: true
13 migrate:
14 dsn: ${env:DATABASE_URL}

Migrations

db/migrations/0001_init.up.sqldiffers
MariaDB
PostgreSQL
1CREATE TABLE tasks (
1CREATE TABLE tasks (
2 id BIGINT NOT NULL AUTO_INCREMENT PRIMARY KEY,
2 id BIGSERIAL PRIMARY KEY,
3 title VARCHAR(200) NOT NULL,
3 title TEXT NOT NULL,
4 completed INT NOT NULL DEFAULT 0,
4 completed BOOLEAN NOT NULL DEFAULT false,
5 created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP
5 created_at TIMESTAMPTZ NOT NULL DEFAULT now()
6);
6);
7
8COMMENT ON TABLE tasks IS 'Jobs to do around the harbour.';
9COMMENT ON COLUMN tasks.completed IS 'Whether the job is done.';
db/migrations/0001_init.down.sqlidentical
MariaDB
PostgreSQL
1DROP TABLE tasks;
1DROP TABLE tasks;

Queries

CreateTaskdiffers
MariaDB · db/queries/tasks.sql
PostgreSQL · db/queries/tasks.sql
1-- CreateTask adds a task and returns it with the id and creation time the database
2-- gave it.
1-- sgl.query(CreateTask, one)
3-- sgl.query(CreateTask, one)
2INSERT INTO tasks (title) VALUES (?) RETURNING id, title, completed, created_at;
4INSERT INTO tasks (title) VALUES ($1) RETURNING id, title, completed, created_at;
ListTasksdiffers
MariaDB · db/queries/tasks.sql
PostgreSQL · db/queries/tasks.sql
1-- ListTasks returns every task, oldest first.
1-- sgl.query(ListTasks, many)
2-- sgl.query(ListTasks, many)
2SELECT id, title, completed, created_at FROM tasks ORDER BY id;
3SELECT id, title, completed, created_at FROM tasks ORDER BY id;
CompleteTaskdiffers
MariaDB · db/queries/tasks.sql
PostgreSQL · db/queries/tasks.sql
1-- CompleteTask marks a task done and returns how many tasks it changed.
1-- sgl.query(CompleteTask, execrows)
2-- sgl.query(CompleteTask, execrows)
2UPDATE tasks SET completed = 1 WHERE id = ?;
3UPDATE tasks SET completed = true WHERE id = $1;

What sgl generates

CreateTaskdiffers
MariaDB
PostgreSQL
1func (queries *Queries) CreateTask(ctx context.Context, title string) (CreateTaskRow, error)
1func (queries *Queries) CreateTask(ctx context.Context, title string) (CreateTaskRow, error)
2
2
3type CreateTaskRow struct {
3type CreateTaskRow struct {
4 ID int64 `json:"id"`
4 ID int64 `json:"id"`
5 Title string `json:"title"`
5 Title string `json:"title"`
6 Completed int32 `json:"completed"`
6 Completed bool `json:"completed"`
7 CreatedAt time.Time `json:"created_at"`
7 CreatedAt time.Time `json:"created_at"`
8}
8}
ListTasksdiffers
MariaDB
PostgreSQL
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 int32 `json:"completed"`
6 Completed bool `json:"completed"`
7 CreatedAt time.Time `json:"created_at"`
7 CreatedAt time.Time `json:"created_at"`
8}
8}
CompleteTaskidentical
MariaDB
PostgreSQL
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
MariaDB
PostgreSQL
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/mariadb/001_first_query/internal/store"
9 "seagull.sh/seagull/examples/postgres/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. The id column is BIGSERIAL, so ID is int64, and
14// created_at is TIMESTAMPTZ, so CreatedAt is a time.Time; the example leaves it out of
15// the output, as it changes on every run.
14//
16//
15// MariaDB, unlike MySQL, has INSERT ... RETURNING, so CreateTask is a one query that
17// sgl.yaml sets go.doc_comments, so the comment above each query in tasks.sql becomes its
16// hands back the new row, the AUTO_INCREMENT id and the column defaults included.
18// method's doc comment, and the migration's COMMENT ON TABLE and COMMENT ON COLUMN become
19// the doc comments of the Tasks model and its Completed field: open internal/store to see
20// them, or hover over queries.CreateTask in an editor.
17//
21//
18// Takes database (*sql.DB) which is a migrated database.
22// Takes database (*sql.DB) which is a migrated database, opened with pgx's database/sql
23// driver.
19// Takes output (io.Writer) which receives the task list.
24// Takes output (io.Writer) which receives the task list.
20//
25//
21// Returns error when a query fails.
26// Returns error when a query fails.
22func run(ctx context.Context, database *sql.DB, output io.Writer) error {
27func run(ctx context.Context, database *sql.DB, output io.Writer) error {
23 queries := store.New(database)
28 queries := store.New(database)
24
29
25 feed, err := queries.CreateTask(ctx, "Feed the seagulls")
30 feed, err := queries.CreateTask(ctx, "Feed the seagulls")
26 if err != nil {
31 if err != nil {
27 return fmt.Errorf("creating a task: %w", err)
32 return fmt.Errorf("creating a task: %w", err)
28 }
33 }
29 if _, err := queries.CreateTask(ctx, "Count the chips"); err != nil {
34 if _, err := queries.CreateTask(ctx, "Count the chips"); err != nil {
30 return fmt.Errorf("creating a task: %w", err)
35 return fmt.Errorf("creating a task: %w", err)
31 }
36 }
32
37
33 completed, err := queries.CompleteTask(ctx, feed.ID)
38 completed, err := queries.CompleteTask(ctx, feed.ID)
34 if err != nil {
39 if err != nil {
35 return fmt.Errorf("completing task %d: %w", feed.ID, err)
40 return fmt.Errorf("completing task %d: %w", feed.ID, err)
36 }
41 }
37 fmt.Fprintf(output, "completed %d task\n", completed)
42 fmt.Fprintf(output, "completed %d task\n", completed)
38
43
39 tasks, err := queries.ListTasks(ctx)
44 tasks, err := queries.ListTasks(ctx)
40 if err != nil {
45 if err != nil {
41 return fmt.Errorf("listing tasks: %w", err)
46 return fmt.Errorf("listing tasks: %w", err)
42 }
47 }
43 for _, task := range tasks {
48 for _, task := range tasks {
44 fmt.Fprintf(output, "%d\t%-18s completed=%d\n", task.ID, task.Title, task.Completed)
49 fmt.Fprintf(output, "%d\t%-18s completed=%t\n", task.ID, task.Title, task.Completed)
45 }
50 }
46 return nil
51 return nil
47}
52}

Go type differences

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

QueryFieldMariaDBPostgreSQL
CreateTaskcolumn completedint32bool
ListTaskscolumn completedint32bool