Update MySQL table from a local file

Question

I have a table in a database, and I\'d like to update a column which I have offline on a local file. The file itself has two columns

1. an ID which corresponds to

Answer 1

I suggest you load your data into a temporary table, then use an INSERT ... SELECT ... ON DUPLICATE KEY UPDATE; for example:

CREATE TEMPORARY TABLE temptable (
  id  INT UNSIGNED NOT NULL,
  val INT,
  PRIMARY KEY (id)
) ENGINE = MEMORY;

LOAD DATA LOCAL INFILE '/path/to/file.txt' INTO temptable FIELDS TERMINATED BY ',';

INSERT INTO my_table
SELECT id, val FROM temptable
ON DUPLICATE KEY UPDATE val = VALUES(val);

DROP TEMPORARY TABLE temptable;