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27.4.5.7 The list_add() Function

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Adds a value to a comma-separated list of values and returns the result.

This function and list_drop() can be useful for manipulating the value of system variables such as sql_mode and optimizer_switch that take a comma-separated list of values.

Parameters

  • in_list TEXT: The list to be modified.

  • in_add_value TEXT: The value to add to the list.

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Return Value

A TEXT value.

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Example
  1. mysql> SELECT @@sql_mode;
  2. +----------------------------------------+
  3. | @@sql_mode                             |
  4. +----------------------------------------+
  5. | ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES |
  6. +----------------------------------------+
  7. mysql> SET @@sql_mode = sys.list_add(@@sql_mode, 'NO_ENGINE_SUBSTITUTION');
  8. mysql> SELECT @@sql_mode;
  9. +---------------------------------------------------------------+
  10. | @@sql_mode                                                    |
  11. +---------------------------------------------------------------+
  12. | ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES,NO_ENGINE_SUBSTITUTION |
  13. +---------------------------------------------------------------+
  14. mysql> SET @@sql_mode = sys.list_drop(@@sql_mode, 'ONLY_FULL_GROUP_BY');
  15. mysql> SELECT @@sql_mode;
  16. +--------------------------------------------+
  17. | @@sql_mode                                 |
  18. +--------------------------------------------+
  19. | STRICT_TRANS_TABLES,NO_ENGINE_SUBSTITUTION |
  20. +--------------------------------------------+

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Document created the 26/06/2006, last modified the 26/10/2018
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References

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