Node.js MySQL更新记录

Question

I am capturing data from an API, putting it in an array ([arr1]) and using node-mysql to query my DB and insert data to it.

This is working fine when pushing new records, as per the below:

    var arr1 = response.data.map(function(item) {
    return [item.employeeDetails.id, item.employeeDetails.personalDetails.firstName, item.employeeDetails.personalDetails.lastName, item.employeeDetails.personalDetails.emailAddress];
});

var query = connection.query('INSERT IGNORE INTO employees(pk_userId, firstName, lastName, emailAddress) VALUES ?', [arr1],
    function(error, results, fields) {
        if (error) console.log(error);
        else {
            console.log("Imported=");
        }
    });

I am trying to add a second query, to update changed records. I have been reading tutorials and docs, however am still having issues. The following is what I am trying after following instructions online:

var query2 = connection.query('UPDATE employees SET ? WHERE ?', [arr1],
    function(err, rows) {
        if (err)
            console.log("Error Updating ", err);
    });

So, I am using the same [arr1] array that I got from the API, however I am a bit lost on how to tell MySQL to look for records to update.

Any advise or direction would be much appreciated.

Answer 1

You should set placeholders '?' with comma seperated syntax.

var query2 = connection.query('UPDATE employees SET ? WHERE ?', [var1, var2],
    function(err, rows) {
        if (err)
            console.log("Error Updating ", err);
    });

This will put var1 into first '?' and var2 into second'?'.