func return type change

pool.go

@@ -77,6 +77,17 @@ func InitPool(conf Config) {
 	poolPGX.Store(p)
 }
 
+// get string builder from pool
+func getSB() *strings.Builder {
+	return poolStringBuilder.Get().(*strings.Builder)
+}
+
+// put string builder back to pool
+func putSB(sb *strings.Builder) {
+	sb.Reset()
+	poolStringBuilder.Put(sb)
+}
+
 // GetPool instance
 func GetPool() *pgxpool.Pool {
 	return poolPGX.Load()
@@ -93,13 +104,7 @@ func BeginTx(ctx context.Context) (pgx.Tx, error) {
 	return tx, err
 }
 
-// get string builder from pool
-func getSB() *strings.Builder {
-	return poolStringBuilder.Get().(*strings.Builder)
-}
-
-// put string builder back to pool
-func putSB(sb *strings.Builder) {
-	sb.Reset()
-	poolStringBuilder.Put(sb)
+// IsNotFound error check
+func IsNotFound(err error) bool {
+	return errors.Is(err, pgx.ErrNoRows)
 }