How do I do a bulk update in mySQL using node.js - mysql

Question

i want to update data in bulk i have over 50 rows to be updated in an array of objects in node JS. something like
https://github.com/felixge/node-mysql
and How do I do a bulk insert in mySQL using node.js
var updateData=[
{a: '15',b: 1,c: '24',d: 9,e: 1,f: 0,g: 0,h: 5850,i: 78 },
{a: '12',b: 1,c: '21',d: 9,e: 1,f: 0,g: 0,h: 55,i: 78 },
{a: '13',b: 1,c: '34',d: 9,e: 1,f: 0,g: 0,h: 58,i: 78 },
{a: '14',b: 1,c: '45',d: 9,e: 1,f: 0,g: 0,h: 585,i:78 },
{a: '16',b: 1,c: '49',d: 9,e: 1,f: 0,g: 0,h: 85,i: 78 }
]
my query is : update table set a= updateData.a ,b= updateData.b ,c = updateData.c , d==updateData.d ,e=updateData.e,f=updateData.f where e=updateData.e

Answer 1

As of I know, there is no direct way to do bulk update records in mySQL. But there is a work around for this - You could execute multiple insert statements and then execute the query to achieve the desired result.
To do this, while creating a connection allow it to execute multiple statements as it is disabled by default.
var connection = mysql.createConnection({
host : dbConfig.host,
user : dbConfig.user,
password : dbConfig.password,
database : dbConfig.database,
multipleStatements: true
});
Then, construct the bulk update query in the below syntax by manipulating the inputs you have.
Query1; Query2; Query3;
Say, for Instance,
update table set a='15', b=1, c='24', d=9, e=1, f=0, g=0, h=5850, i=78;update table set a='12', b=1, c='21', d=9, e=1, f=0, g=0, h=5850, i=78;
Then, execute the query as usual,
connection.query(sqlQuery, params, callback);
Hope this helps.

Answer 2

You can accomplish this by enabling the multiple statements feature in your mysql connection. Then you can loop through your updateData and construct mysql statements separated by a ';'. You can see an example of this in this answer.

Answer 3

It's really not easy to bulk update data using node-MySQL but here you can do an alternative if you can use .map function in the frontend. Let me show you what i did with mine--
just make a single update API and use it like this in your frontend-
updateData.map((item, key)=>{
return (
axios.path('/api/update', {
a: item.a,
b: item.b,
c: item.c
})
).then(()=> console.log('updated'))
.catch((err)=> console.log(err))
})

Answer 4

there are couple ifs, but
if you have a unique constraint on column e
if you have a default values for all columns in the target table which are not affected by this query
then you can use this slightly nasty way:
const sql = `insert into table (a,b,c,d,e,f)
values ?
on duplicate key update
a = values(a),
b = values(b),
c = values(c),
d = values(d),
f = values(f)`
the use the query variant with passed values (updateData in your case):
connection.query(sqlString, updateData, callback)
your updateData should be an array of arrays of values to go into a,b,c,d,e,f columns

Answer 5

A little late answering, but using MySQL JSON_TABLE can help. Here's a working example:
UPDATE person a
INNER JOIN (
SELECT
personId, addressType, addressId
FROM JSON_TABLE('
[
{"personId": 318, "addressType": "Primary", "addressId": 712},
{"personId": 319, "addressType": "Shipping", "addressId": 712}
]',
'$[*]' COLUMNS(
personId INT PATH '$.personId',
addressType VARCHAR(10) path '$.addressType',
addressId INT path '$.addressId')
) a) b
ON a.personId = b.personId
SET
a.addressId = b.addressId,
a.addressType = b.addressType;