implement svg interface in login and signup

core/svg-icon/db_interface.go

@@ -0,0 +1,58 @@
+package svg_icon
+
+import (
+	"database/sql"
+	"go-nkode/util"
+)
+
+type SvgIcon struct {
+	Id  int
+	Svg string
+}
+
+type SvgIconDb struct {
+	path string
+}
+
+func (d *SvgIconDb) GetSvgsById(ids []int) ([]string, error) {
+	db, err := sql.Open("sqlite3", d.path)
+	if err != nil {
+		return nil, err
+	}
+	defer db.Close()
+	selectId := "SELECT svg FROM svg_icon where id = ?"
+	svgs := make([]string, len(ids))
+	for idx, id := range ids {
+		rows, err := db.Query(selectId, id)
+		if err != nil {
+			return nil, err
+		}
+		err = rows.Scan(&svgs[idx])
+		if err != nil {
+			return nil, err
+		}
+	}
+	return svgs, nil
+}
+
+func (d *SvgIconDb) GetRandomIds(count int) ([]int, error) {
+	db, err := sql.Open("sqlite3", d.path)
+	if err != nil {
+		return nil, err
+	}
+	defer db.Close()
+	rows, err := db.Query("SELECT COUNT(*) FROM svg_icon;")
+	if err != nil {
+		return nil, err
+	}
+	var tableLen int
+	err = rows.Scan(&tableLen)
+	if err != nil {
+		return nil, err
+	}
+	perm, err := util.RandomPermutation(tableLen)
+	if err != nil {
+		return nil, err
+	}
+	return perm[:count], nil
+}