IGNORE

The IGNORE option tells the server to ignore some common errors.

IGNORE can be used with the following statements:

The logic used:

  • Variables out of ranges are replaced with the maximum/minimum value.
  • SQL_MODEs STRICT_TRANS_TABLES, STRICT_ALL_TABLES, NO_ZERO_IN_DATE, NO_ZERO_DATE are ignored.
  • Inserting NULL in a NOT NULL field will insert 0 ( in a numerical field), 0000-00-00 ( in a date field) or an empty string ( in a character field).
  • Rows that cause a duplicate key error or break a foreign key constraint are not inserted, updated, or deleted.

The following errors are ignored:

Error number Symbolic error name Description
1022 ER_DUP_KEY Can't write; duplicate key in table '%s'
1048 ER_BAD_NULL_ERROR Column '%s' cannot be null
1062 ER_DUP_ENTRY Duplicate entry '%s' for key %d
1242 ER_SUBQUERY_NO_1_ROW Subquery returns more than 1 row
1264 ER_WARN_DATA_OUT_OF_RANGE Out of range value for column '%s' at row %ld
1265 WARN_DATA_TRUNCATED Data truncated for column '%s' at row %ld
1292 ER_TRUNCATED_WRONG_VALUE Truncated incorrect %s value: '%s'
1366 ER_TRUNCATED_WRONG_VALUE_FOR_FIELD Incorrect integer value
1369 ER_VIEW_CHECK_FAILED CHECK OPTION failed '%s.%s'
1451 ER_ROW_IS_REFERENCED_2 Cannot delete or update a parent row
1452 ER_NO_REFERENCED_ROW_2 Cannot add or update a child row: a foreign key constraint fails (%s)
1526 ER_NO_PARTITION_FOR_GIVEN_VALUE Table has no partition for value %s
1586 ER_DUP_ENTRY_WITH_KEY_NAME Duplicate entry '%s' for key '%s'
1591 ER_NO_PARTITION_FOR_GIVEN_VALUE_SILENT Table has no partition for some existing values
1748 ER_ROW_DOES_NOT_MATCH_GIVEN_PARTITION_SET Found a row not matching the given partition set

Ignored errors normally generate a warning.

A property of the IGNORE clause consists in causing transactional engines and non-transactional engines (like XtraDB and Aria) to behave the same way. For example, normally a multi-row insert which tries to violate a UNIQUE contraint is completely rolled back on XtraDB/InnoDB, but might be partially executed on Aria. With the IGNORE clause, the statement will be partially executed in both engines.

Duplicate key errors also generate warnings. The OLD_MODE server variable can be used to prevent this.

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https://mariadb.com/kb/en/ignore/