Rasande: Mysql Batch Insert Generated Keys

Mysql Batch Insert Generated Keys

When importing data into innodb turn off autocommit mode because it performs a log flush to disk for every insert. So from the jdbc perspective the mysql jdbc drivers implementation of the getgeneratedkeys method is not consistent with the jdbc documentation.

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855 bulk data loading for innodb tables these performance tips supplement the general guidelines for fast inserts in section 8251 optimizing insert statements.

Mysql batch insert generated keys. To get the generated keys while batch insert we need to give the parameter name as list using at param annotation. It strikes me that the intent of the on duplicate key update performs the behavior as the oracle merge statement. Oracles merge statement does enforce matching the submitted key against the current key which is how mysql performs when the primary key column is included in the overriding signature.

To get the generated key from a mysql database table just use the mysql lastinsertid function calling it as shown below immediately after performing your insert command and very importantly also using the same connection. The only workaround is to use separate query to retrive. In mysql 8019 and later a row alias with one or more optional column alises can be used with on duplicate key update to refer to the row to be inserted.

This enables multiple row inserts to be reproduced correctly on other servers in a replication setup. If the autoincrement column is part of multiple indexes mysql generates sequence values using the index that begins with the autoincrement column if there is one. Retrieving auto generated keys on bulk insert.

If anything else we does not get the expect values. Heres a blurb from this mysql page. Lastinsertid with no argument returns the first automatically generated value that was set for an autoincrement column by the most recently executed insert statement to affect such a column.

Insert with an on duplicate key update clause enables existing rows to be updated if a row to be inserted would cause a duplicate value in a unique index or primary key. When extended insert insert with several tuples in one query is used with on duplicate key update clause and therere unique key conflict the connectorjs statement will return incorrect list of generated identifiers that cannot be matched with tuples from insert query at all for more details see how to repeat section. If anything else we does not get the expect values.

For a multiple row insert lastinsertid and mysqlinsertid actually return the autoincrement key from the first of the inserted rows. Not just the first key. For example if the animals table contained indexes primary key grp id and index id mysql would ignore the primary key for generating sequence values.

View as plain text. Retrieving auto generated keys on bulk insert.

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