MyBatis Set Tag: Usage Scenarios

The set tag in MyBatis is typically used for update operations, enabling the dynamic generation of fields and values that need to be updated in dynamic SQL.

Here are some common use cases for the “set” tag:

1. Dynamically updating table fields: Using the set tag allows for dynamically specifying which fields and values to update in an operation, based on conditions determining which fields to update.
2. Handling null values: You can use the set tag to handle the situation where a field value is empty, avoiding setting the field value to null during an update operation.
3. Handling special characters: The use of the set tag can help in dealing with special characters, such as escaping or formatting field values.
4. Updating time handling: The modification time of records can be dynamically updated through the set tag to keep the data up-to-date.

In general, the set tag is mainly used to flexibly specify the fields and values that need to be updated in update operations, as well as to handle some special cases, enhancing the dynamic SQL functionality of MyBatis.