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May 17, 2017 The entities are new, but for some reason EF is attempting to insert the primary key column causing a duplicate primary key exception (attempting to insert an entity with Key. I'm create a few related entities and attempting to save them. ON DUPLICATE KEY UPDATE inserts or updates a row, the LASTINSERTID function returns the AUTOINCREMENT value. Exception: For updates, LASTINSERTID is not meaningful prior to MySQL 5.1.12. However, you can work around this by using LASTINSERTID(expr). ON DUPLICATE KEY UPDATE is a MariaDB/MySQL extension to the INSERT statement that, if it finds a duplicate unique or primary key, will instead perform an UPDATE. The row/s affected value is reported as 1 if a row is inserted, and 2 if a row is updated, unless the API's CLIENTFOUNDROWS flag is set. Dec 15, 2017 Questions: From MySQL 4.1.0 onwards, it is possible to add ON DUPLICATE KEY UPDATE statement to specify behavior when values inserted (with INSERT or SET or VALUES) are already in destination table w.r.t. PRIMARY KEY or some UNIQUE field. If value for PRIMARY KEY or some UNIQUE field are already in table, INSERT is replaced.
If you specify ON DUPLICATE KEY UPDATE
, and a row is inserted that would cause a duplicate value in a UNIQUE
index or PRIMARY KEY
, MySQL performs an UPDATE
of the old row. For example, if column a
is declared as UNIQUE
and contains the value 1
, the following two statements have similar effect:
(The effects are not identical for an InnoDB
table where a
is an auto-increment column. With an auto-increment column, an INSERT
statement increases the auto-increment value but UPDATE
does not.)
The ON DUPLICATE KEY UPDATE
clause can contain multiple column assignments, separated by commas.
With ON DUPLICATE KEY UPDATE
, the affected-rows value per row is 1 if the row is inserted as a new row, and 2 if an existing row is updated.
If column b
is also unique, the INSERT
is equivalent to this UPDATE
statement instead:
If a=1 OR b=2
matches several rows, only one row is updated. In general, you should try to avoid using an ON DUPLICATE KEY UPDATE
clause on tables with multiple unique indexes.
You can use the VALUES(
function in the col_name
)UPDATE
clause to refer to column values from the INSERT
portion of the INSERT .. ON DUPLICATE KEY UPDATE
statement. In other words, VALUES(
in the col_name
)ON DUPLICATE KEY UPDATE
clause refers to the value of col_name
that would be inserted, had no duplicate-key conflict occurred. This function is especially useful in multiple-row inserts. The VALUES()
function is meaningful only in INSERT .. UPDATE
statements and returns NULL
otherwise. Example:
That statement is identical to the following two statements:
If a table contains an AUTO_INCREMENT
column and INSERT .. ON DUPLICATE KEY UPDATE
inserts or updates a row, the LAST_INSERT_ID()
function returns the AUTO_INCREMENT
value. Exception: For updates, LAST_INSERT_ID()
is not meaningful prior to MySQL 5.1.12. However, you can work around this by using LAST_INSERT_ID(
. Suppose that expr
)id
is the AUTO_INCREMENT
column. To make LAST_INSERT_ID()
meaningful for updates, insert rows as follows:
The DELAYED
option is ignored when you use ON DUPLICATE KEY UPDATE
.
An INSERT .. ON DUPLICATE KEY UPDATE
on a partitioned table using a storage engine such as MyISAM
that employs table-level locks locks all partitions of the table. This does not occur with tables using storage engines such as InnoDB
that employ row-level locking. This issue is resolved in MySQL 5.6. See Section 18.5.4, “Partitioning and Table-Level Locking”, for more information.