mybatis批量更新sql

MyBatis provides a way to perform batch updates using the update statement. Here's how you can perform a batch update in MyBatis:

Define the update statement in your XML mapper file. The update statement should include multiple <foreach> tags to iterate over the collection of objects you want to update.

<update id="updateBatch" parameterType="java.util.List">
  UPDATE your_table
  SET column1 = #{item.column1},
      column2 = #{item.column2},
      ...
  WHERE id = #{item.id}
</update>

In your Java code, create a list of objects that you want to update.

List<YourObject> objectsToUpdate = new ArrayList<>();
// Add your objects to the list

Use the SqlSession object to execute the batch update.

try (SqlSession sqlSession = sqlSessionFactory.openSession(ExecutorType.BATCH)) {
  YourMapper mapper = sqlSession.getMapper(YourMapper.class);
  mapper.updateBatch(objectsToUpdate);
  sqlSession.commit();
}

In your mapper interface, define a method that corresponds to the update statement.

public interface YourMapper {
  void updateBatch(List<YourObject> objects);
}

That's it! MyBatis will automatically execute the update statement for each object in the list. Note that you need to use the ExecutorType.BATCH to enable batch execution