feat: add migration method

db/db.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"log"
 	"path/filepath"
+	"strconv"
 	"strings"
 
 	Config "micrach/config"
@@ -14,6 +15,12 @@ import (
 
 var Pool *pgxpool.Pool
 
+type MigrationsMap map[int]string
+type Migration struct {
+	ID   int
+	Name string
+}
+
 func Init() {
 	var err error
 	Pool, err = pgxpool.Connect(context.TODO(), Config.Db.Url)
@@ -26,14 +33,55 @@ func Init() {
 }
 
 func Migrate() {
-	migrations := Files.GetFullFilePathsInFolder("migrations")
-	log.Println(migrations)
-	for _, m := range migrations {
+	dbMigrations := getDbMigrations()
+	sqlMigrations := Files.GetFullFilePathsInFolder("migrations")
+	for _, m := range sqlMigrations {
 		filename := filepath.Base(m)
 		splitted := strings.Split(filename, "-")
-		id, name := splitted[0], splitted[1]
-		log.Println(id, name)
-		log.Println(Files.ReadFileText(m))
+		id, err := strconv.Atoi(splitted[0])
+		if err != nil {
+			log.Panicln(err)
+		}
+		name := strings.Split(splitted[1], ".")[0]
+
+		if _, ok := dbMigrations[id]; !ok {
+			_, err = Pool.Query(context.TODO(), Files.ReadFileText(m))
+			if err != nil {
+				log.Panicln(err)
+			}
+
+			sql := `INSERT INTO migrations (id, name) VALUES ($1, $2)`
+			_, err = Pool.Query(context.TODO(), sql, id, name)
+			if err != nil {
+				log.Panicln(err)
+			}
+		}
 	}
+
 	log.Println("database migrations - online")
 }
+
+func getDbMigrations() MigrationsMap {
+	sql := `SELECT id, name FROM migrations`
+	rows, err := Pool.Query(context.TODO(), sql)
+	if err != nil {
+		log.Panicln(err)
+	}
+
+	if rows.Err() != nil {
+		log.Panicln(rows.Err())
+	}
+
+	migrationsMap := make(MigrationsMap)
+	for rows.Next() {
+		var m Migration
+		err = rows.Scan(&m.ID, &m.Name)
+		if err != nil {
+			log.Panicln(err)
+		}
+
+		migrationsMap[m.ID] = m.Name
+	}
+
+	return migrationsMap
+}