Node mysql bulk insert with express array parameter - mysql

Question

I've come across a situation where I need to use a bulk insert with my Node project.
This of course has already been answered here: How do I do a bulk insert in mySQL using node.js
However, I have an express project which I use to create an api. The parameters are turned into an array and I'm having trouble using that array with a bulk insert. Whenever I try to use that route, I get an error of Error: ER_WRONG_VALUE_COUNT_ON_ROW: Column count doesn't match value count at row 1
After some digging I found that it tries to insert:
['foo', 'bar', 'test']
When I need it to insert:
['foo']
['bar']
['test']
Anyways, here's the whole code:
Route
router.post("/", function (req, res, next) {
db.query(
"REPLACE INTO user (`Name`) VALUES (?)",
[req.query.array],
function (error, response) {
if (error) throw error;
console.log(response);
}
)
});
Route Caller
let requestUrl = "http://localhost:3000/user?";
// External api request which returns a list of users
for (let i = 0; i < body.users.length; i++) {
requestUrl += `array=${body.users[i]}&`
}
let addUserRequest = {
url: requestUrl,
method: "POST"
};
request(addUserRequest, function (error, response, body) {
console.log(body);
});
The url that is generated is:
http://localhost:3000/user?array=foo&array=bar&array=test

Answer 1

Try this,
var datatoDB = [];
req.query.array.forEach(function(entry) {
console.log(entry);
datatoDB.push([entry]);
});
Here we are trying to convert this ['foo', 'bar', 'test'] to this [["foo"], ["bar"], ["test"]].
Now, use datatoDB in your function.
router.post("/", function (req, res, next) {
db.query(
"REPLACE INTO user (Name) VALUES ?",
[datatoDB],
function (error, response) {
if (error) throw error;
console.log(response);
}
)
});