How do I use expression with bulk insert using npm mysql?

Question

This question answers 99% of what I am looking for... How do I do a bulk insert in mySQL using node.js

var sql = "INSERT INTO Test (name, email, n) VALUES ?";
var values = [
    ['demian', '[email protected]', 1],
    ['john', '[email protected]', 2],
    ['mark', '[email protected]', 3],
    ['pete', '[email protected]', 4]
];
conn.query(sql, [values], function(err) {
    if (err) throw err;
    conn.end();
});

If I want to pass an expression, such as NOW(), how would I do that? If I pass it in the array, it would count as a string. Since VALUES is a ? that gets populated by the array, I can't easily inject an expression. Any ideas?

score 2 · Accepted Answer · answered Apr 21 '17 at 02:18

Basically it seems impossible, so you should make a query string you want.

I would try this as follows.

var sql = "INSERT INTO Test (name, email, n, modified_on) VALUES ?";
var values = [
    ['demian', '[email protected]', 1, '::NOW()'],
    ['john', '[email protected]', 2, '::UNIX_TIMESTAMP()'],
    ['mark', '[email protected]', 3, '::DATE()'],
    ['pete', '[email protected]', 4, '::NOW()']
];

var formattedQuery = connection.format(sql, [values]).replace(/'::(.*?)'/g, '$1');

connection.query(formattedQuery, function(err) {
});

fomattedQuery is as follows.

INSERT INTO Test (name, email, n, modified_on) VALUES ('demian', '[email protected]', 1, NOW()), ('john', '[email protected]', 2, UNIX_TIMESTAMP()), ('mark', '[email protected]', 3, DATE()), ('pete', '[email protected]', 4, NOW())

I hope this helps.

How do I use expression with bulk insert using npm mysql?

1 Answers1