entc/gen/template: remove irrelevant code from templates (#481)

entc/gen/template/dialect/sql/globals.tmpl

@@ -5,36 +5,4 @@ in the LICENSE file in the root directory of this source tree.
 */}}
 
 {{/* custom globals and helpers for sql dialects */}}
-{{ define "dialect/sql/globals" }}
-// insertLastID invokes the insert query on the transaction and returns the LastInsertID.
-func insertLastID(ctx context.Context, tx dialect.Tx, insert *sql.InsertBuilder) (int64, error) {
-	query, args := insert.Query()
-	// PostgreSQL does not support the LastInsertId() method of sql.Result
-	// on Exec, and should be extracted manually using the `RETURNING` clause.
-	if insert.Dialect() == dialect.Postgres {
-		rows := &sql.Rows{}
-		if err := tx.Query(ctx, query, args, rows); err != nil {
-			return 0, err
-		}
-		defer rows.Close()
-		if !rows.Next() {
-			return 0, fmt.Errorf("no rows found for query: %v", query)
-		}
-		var id int64
-		if err := rows.Scan(&id); err != nil {
-			return 0, err
-		}
-		return id, nil
-	}
-	// MySQL, SQLite, etc.
-	var res sql.Result
-	if err := tx.Exec(ctx, query, args, &res); err != nil {
-		return 0, err
-	}
-	id, err := res.LastInsertId()
-	if err != nil {
-		return 0, err
-	}
-	return id, nil
-}
-{{ end }}
+{{ define "dialect/sql/globals" }}{{ end }}