If you specify an ON DUPLICATE KEY UPDATE clause and a row to be inserted would cause a duplicate value in a UNIQUE index or PRIMARY KEY, an UPDATE of the old row occurs. Using the MySQL INSERT on duplicate UPDATE query with PHP and PDO prepared statements ... November 7, 2019. In one of our larger Rails apps the sheer volume of data we process means we’ve had to rely more and more on direct SQL queries, denormalised tables and summary tables to speed things up. INSERT INTO t1 (a,b,c) VALUES (1,2,3) ON DUPLICATE KEY UPDATE c=c+1; UPDATE t1 SET c=c+1 WHERE a=1; MySQL UPSERT Example. However, there are other statements like INSERT IGNORE or REPLACE, which can also fulfill this objective. but this won't work when the MySQL database is at the back end of an active web site, with multiple interleaved queries happening all the time. ; What you stated in the question is really all … MySQL UPSERT with Examples. PHP PDO INSERT on duplicate UPDATE. VALUES(b) will return NULL, even if it is in an INSERT .. ON DUPLICATE KEY UPDATE statement. Using the MySQL INSERT on duplicate UPDATE query with PHP and PDO prepared statements. Along with the INSERT statement, ON DUPLICATE KEY UPDATE statement defines a list of column & value assignments in case of duplicate. . ON DUPLICATE KEY UPDATE reports that a record was updated when the duplicate key occurs even if the record wasn't actually changed because the update values are the same as those in the record. We’ll discuss and see all these solutions in this post today. Conditional duplicate key updates with MySQL. For example, if column a is declared as UNIQUE and contains the value 1, the following two statements have similar effect: . . By default, MySQL provides the ON DUPLICATE KEY UPDATE option to INSERT, which accomplishes this task. For instance in our example when we don't have such values in database, after this query we will have row with article_id = 12 and views_count = 1 (not 2). Now, when using INSERT on DUPLICATE KEY UPDATE, we need to specify the criteria that the database needs to check in order to decide if it should update or insert. How it works : The statement first attempts to insert a new row into the table. We need a unique key, and MySQL allows us to specify multiple columns via a composite key… For example, if column a is declared as UNIQUE and contains the value 1, the following two statements have similar effect: . INSERT INTO t1 (a,b,c) VALUES (1,2,3) ON DUPLICATE KEY UPDATE c=c+1; UPDATE t1 SET c=c+1 WHERE a=1; However, it also contains some other statements to fulfill this objective, such as INSERT IGNORE or REPLACE. ON DUPLICATE KEY UPDATE. Batch insert with ON DUPLICATE KEY. Other updates could sneak in between my separate SELECT / INSERT queries. : INSERT INTO t1 VALUES(1,2) ON DUPLICATE KEY UPDATE a=(SELECT a FROM t2 WHERE b=VALUES(b)); This does not do what the user expects. on duplicate key update updatecounter = updatecounter + 1 fieldname = 'fieldvalue' . . We will learn and see all these solutions in detail. E.g. insert into tablename set keyname = 'keyvalue', fieldname = 'fieldvalue' . < All Articles. MySQL provides the ON DUPLICATE KEY UPDATE option to INSERT, which accomplishes this behavior. TheWebFellas. We build Web & Mobile Applications. . If you specify an ON DUPLICATE KEY UPDATE clause and a row to be inserted would cause a duplicate value in a UNIQUE index or PRIMARY KEY, an UPDATE of the old row occurs. It means that all code after ON DUPLICATE KEY UPDATE won't be executed. There is also option to make batch insert to database using ON DUPLICATE KEY UPDATE. Also, the non-standard use in INSERT ... ON DUPLICATE KEY UPDATE does not extend to subqueries.
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