Merge commit '47d4dcf042f5ec927d592f03964cd12aab2bb66f' as 'backend/go-sqlite3'

2026-05-24 09:39:27 +02:00
parent 7c1e2fb228 47d4dcf042
commit 5ed3f1b8b7
98 changed files with 299557 additions and 0 deletions
@@ -0,0 +1,129 @@
+package main
+
+import (
+	"database/sql"
+	"database/sql/driver"
+	"encoding/json"
+	"fmt"
+	_ "github.com/mattn/go-sqlite3"
+	"log"
+	"os"
+)
+
+type Tag struct {
+	Name    string `json:"name"`
+	Country string `json:"country"`
+}
+
+func (t *Tag) Scan(value interface{}) error {
+	return json.Unmarshal([]byte(value.(string)), t)
+}
+
+func (t *Tag) Value() (driver.Value, error) {
+	b, err := json.Marshal(t)
+	return string(b), err
+}
+
+func main() {
+	os.Remove("./foo.db")
+
+	db, err := sql.Open("sqlite3", "./foo.db")
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer db.Close()
+
+	// Using a json-typed column
+	// Verify type: `create table foo (tag text) strict`
+	_, err = db.Exec(`create table foo (tag json)`)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	stmt, err := db.Prepare("insert into foo(tag) values(?)")
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer stmt.Close()
+	_, err = stmt.Exec(`{"name": "mattn", "country": "japan"}`)
+	if err != nil {
+		log.Fatal(err)
+	}
+	_, err = stmt.Exec(`{"name": "michael", "country": "usa"}`)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	var country string
+	err = db.QueryRow("select tag->>'country' from foo where tag->>'name' = 'mattn'").Scan(&country)
+	if err != nil {
+		log.Fatal(err)
+	}
+	fmt.Println(country)
+
+	var tag Tag
+	err = db.QueryRow("select tag from foo where tag->>'name' = 'mattn'").Scan(&tag)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	fmt.Println(tag.Name)
+
+	tag.Country = "日本"
+	_, err = db.Exec(`update foo set tag = ? where tag->>'name' == 'mattn'`, &tag)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	err = db.QueryRow("select tag->>'country' from foo where tag->>'name' = 'mattn'").Scan(&country)
+	if err != nil {
+		log.Fatal(err)
+	}
+	fmt.Println(country)
+
+	// Using a jsonb-typed column
+	// Verify type: `create table bar (tag blob) strict`
+	_, err = db.Exec(`create table bar (tag jsonb)`)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	stmt, err = db.Prepare("insert into bar(tag) values(jsonb(?))")
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer stmt.Close()
+	_, err = stmt.Exec(`{"name": "mattn", "country": "japan"}`)
+	if err != nil {
+		log.Fatal(err)
+	}
+	_, err = stmt.Exec(`{"name": "michael", "country": "usa"}`)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	err = db.QueryRow("select tag->>'country' from bar where tag->>'name' = 'mattn'").Scan(&country)
+	if err != nil {
+		log.Fatal(err)
+	}
+	fmt.Println(country)
+
+	err = db.QueryRow("select json(tag) from bar where tag->>'name' = 'mattn'").Scan(&tag)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	fmt.Println(tag.Name)
+
+	tag.Country = "日本"
+	_, err = db.Exec(`update bar set tag = jsonb(?) where tag->>'name' == 'mattn'`, &tag)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	err = db.QueryRow("select tag->>'country' from bar where tag->>'name' = 'mattn'").Scan(&country)
+	if err != nil {
+		log.Fatal(err)
+	}
+	fmt.Println(country)
+}