Update Multiple Rows mysql

问题

I have a table tbl

|id|points|
 1   15
 2   35
 3   445
 4   42

Now if i have an array like

array (2=>10,3=>825,4=>48)

And i want to change the points so that the tbl looks like this.

|id|points|
 1   15
 2   10
 3   825
 4   48

I can change the values using multiple queries but can anyone show how to do this with one single query ?

回答1:

Use a case statement...

Update tbl
set points = CASE 
  WHEN ID = 1 then 05 
  when ID = 2 then 10 
  when ID = 3 then 825 
  when ID = 4 then 48 END

Working fiddle: http://sqlfiddle.com/#!9/6cb0d/1/0

回答2:

First you have to upload your array to a temp. table. Let's call it new_list, than you can do something like

UPDATE table as t
SET points = (SELECT points FROM new_list WHERE t.id = new_list.id)

To be honest, I have no clue whether this is running on MySQL so you might need to put some own thoughts into.

As it appears the data is inside an PHP array, I think maybe rendering something like

UPDATE table SET points = $points WHERE id = $id1
UPDATE table SET points = $points WHERE id = $id2
UPDATE table SET points = $points WHERE id = $id3

来源：https://stackoverflow.com/questions/29019317/update-multiple-rows-mysql