Question

我想使用hana db获取插入的自动增量id。我们尝试在互联网上搜索也尝试使用jdbc keyholder选项。对于自动增量的支持最近来到了hana，我没有得到榜样同样的有办法吗？

Answer 1

我假设＆＃34;自动增量＆＃34;您的意思是HANA SPS 8附带的IDENTITY列选项？

CREATE COLUMN TABLE <table_name> (<column_name> <num_data_type
  GENERATED BY DEFAULT AS IDENTITY);

此博客文章解释了其工作原理：
https://blogs.sap.com/2014/06/04/quick-note-on-identity-column-in-sap-hana/

--- 引用： ---

这背后的魔力当然是由序列：

创建的

select column_name, column_id from table_columns where table_name = 'SOME_NAMES'

+-------------+-----------+
| COLUMN_NAME | COLUMN_ID |
+-------------+-----------+
| ID          |    145210 |
| NAME        |    145211 |
+-------------+-----------+

select * from sequences where sequence_name like ‘%145210%’

+-------------+---------------------------+--------------+--------------+-----------+------------------+--------------+-----------+-------------------------------------------+------------+
| SCHEMA_NAME |  SEQUENCE_NAME            | SEQUENCE_OID | START_NUMBER | MIN_VALUE | MAX_VALUE        | INCREMENT_BY | IS_CYCLED | RESET_BY_QUERY                            | CACHE_SIZE |
+-------------+---------------------------+--------------+--------------+-----------+------------------+--------------+-----------+-------------------------------------------+------------+
| SYSTEM      | _SYS_SEQUENCE_145210_#0_# |    145215    |     1        |    1      |       4611686018 |              |           |                                           |            |
+-------------+---------------------------+--------------+--------------+-----------+------------------+--------------+-----------+-------------------------------------------+------------+

Aaaaand，就是这样。

--- 结束报价 ---

从这里您可以使用 CURRVAL 来获取最后生成的值。

SELECT SYSTEM."_SYS_SEQUENCE_145210_#0_#".CURRVAL FROM DUMMY

在执行插入查询后获取生成自动增量ID - HANA

1 个答案: