Is there a way to use ON DUPLICATE KEY to Update all that I wanted to insert?

问题

I know that you can use ON DUPLICATE KEY UPDATE to update a certain value if there is a record for that key already,

I can do this:

INSERT INTO `tableName` (`a`,`b`,`c`) VALUES (1, 2, 3)
ON DUPLICATE KEY UPDATE `a`=1, `b`=2, `c`=3

But how can I do this without having to write out the columns and values twice?

回答1:

Unfortunately not.

You can get half-way there by not having to repeat the value:

INSERT INTO `tableName` (`a`,`b`,`c`) VALUES (1,2,3)
  ON DUPLICATE KEY UPDATE `a`=VALUES(`a`), `b`=VALUES(`b`), `c`=VALUES(`c`);

But you still have to list the columns.

回答2:

use REPLACE INTO

The meaning of REPLACE INTO is that IF the new record presents new key values, then it will be inserted as anew record.

IF the new record has key values that match a pre-existing record,then the key violation will be ignored and the new record will replace the pre-existing record.

回答3:

If it is useful, I made a query to avoid writing by hand the last part of the "on duplicate" query, for versions >= 5.0:

SELECT GROUP_CONCAT( CONCAT(COLUMN_NAME,"=values(", COLUMN_NAME,")") SEPARATOR ", ") FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_SCHEMA = 'database_name' AND TABLE_NAME = 'table_name';

and its output is this:

a=values(a), b=values(b), c=values(c), d=values(d)

on a table that has columns a,b,c and d, so you can append to the first part of the query:

INSERT INTO `tableName` (`a`,`b`,`c`, `d`) VALUES (1,2,3,4) ON DUPLICATE KEY UPDATE a=values(a), b=values(b), c=values(c), d=values(d)

UPDATE: For a very long list of columns you may see a truncated output, you may use this statement before the query above (thanks Uncle iroh):

SET SESSION group_concat_max_len = 1000000;

回答4:

i know this is an old question, and this is a somewhat unconventional answer, but i ran into the same thing and was having issues with setting the group_concat_max_len property mentioned in another answer and was always getting a truncated result. Another option that I ultimately went with when writing a long script was to use this formula in excel:

=SUBSTITUTE(TRIM(A1), ",", "") & " = VALUES(" & SUBSTITUTE(TRIM(A1), ",", "") & "),"

where A1 is the cell you copy the field name into. To do this quickly, I'd right click the table and copy the select statement to the clipboard, which gives you all the colum names, the formula removes the commas.

Hope this helps someone!

来源：https://stackoverflow.com/questions/9537710/is-there-a-way-to-use-on-duplicate-key-to-update-all-that-i-wanted-to-insert

标签

mysql

insert

on-duplicate-key