如何在Web SQL数据库中插入多行？

Question

I have a JavaScript object with multiple rows of data and I want to insert it into web sql database. Here is how my code looks like.

for(i in rows)
{
    (function(row){
        db.transaction(function(tx) {
            tx.executeSql("INSERT INTO my_table (id, name, parent_id) VALUES (?, ?, ?)",
                [ row.id, row.name, row.parent_id ], onSuccess, onError
            );
        });
    })(rows[i]);
}

My questions about this are:

1. This can be done by moving outer loop inside db.transaction . Will it be better and why?
2. Is it possible to add multiple rows in single query like multiple values in single MySQL INSERT ? Or I should not worry about this.

Answer 1

This can be done by moving outer loop inside db.transaction. Will it be better and why?

yes. much better. 1) creating a transaction is not cheap. 2) looping async is generally bad .

Is it possible to add multiple rows in single query like multiple values in single MySQL INSERT? Or I should not worry about this.

don't worry. Multiple rows workaround are syntactic sugar. No performance benefit. Better loop it under one transaction.

Again do not loop executeSql, it is async.