尝试在 DB2 中的 SPROC 中重命名多个表时出错

Question

I've created a DB2 sql script that populates a static table and then does a rename to swap out the live table with the newly updated one. Its a fairly large SQL script so I'm only including the areas that Im having a an error on.

I'm getting the error: "[IBM][CLI Driver][DB2/NT64] SQL0104N An unexpected token "RENAME" was found following "D_HOLIDAY_LOG_OLD; ". Expected tokens may include: "TRUNCATE". LINE NUMBER=382. SQLSTATE=42601".

I suspect, its a syntax issue with the RENAME commands. If I need to add the whole query, I can. Thanks in advance

CREATE OR REPLACE PROCEDURE NSD_HOLIDAY_LOG_SPROC()
LANGUAGE SQL
SPECIFIC SP_NSD_HOLIDAY_LOG_SPROC
DYNAMIC RESULT SETS 1
BEGIN

COMMIT;
TRUNCATE TABLE TMWIN.NSD_HOLIDAY_LOG immediate;

DROP TABLE NSD_HOLIDAY_LOG_OLD;
RENAME TABLE TMWIN.NSD_HOLIDAY_LOG_LIVE TO NSD_HOLIDAY_LOG_OLD;
RENAME TABLE TMWIN.NSD_HOLIDAY_LOG TO NSD_HOLIDAY_LOG_LIVE;
RENAME TABLE TMWIN.NSD_HOLIDAY_LOG_OLD TO NSD_HOLIDAY_LOG;

END@

Answer 1

This is frequently asked.

As you are using static SQL in an SQL PL stored procedure, you must follow the documented rules for blocks of Compound SQL (Compiled) statements.

On of those rules is that static SQL has a restricted set of statements that can appear in such a block of code.

For example, with current versions of Db2-LUW, you cannot use any of the following statically (including rename table) : ALTER , CONNECT,CREATE, DESCRIBE, DISCONNECT, DROP, FLUSH EVENT MONITOR, FREE LOCATOR, GRANT, REFRESH TABLE, RELEASE (connection only), RENAME TABLE, RENAME TABLESPACE, REVOKE, SET CONNECTION, SET INTEGRITY, SET PASSTHRU, SET SERVER OPTION ,TRANSFER OWNERSHIP

Other Db2 platforms (Z/OS, i-series) might have different restrictions but the same principle.

To achieve what you need you can use dynamic SQL instead of Static-SQL (as long as you understand the implications).

In other words, instead of writing:

RENAME TABLE TMWIN.NSD_HOLIDAY_LOG_LIVE TO NSD_HOLIDAY_LOG_OLD;

you could instead use:

execute immediate('RENAME TABLE TMWIN.NSD_HOLIDAY_LOG_LIVE TO NSD_HOLIDAY_LOG_OLD' );

or equivalent.

You can also use two statements, one to PREPARE and the other to EXECUTE , whichever suits the design. Refer to the documentation for execute immediate .

The same is true for other statements that your version of Db2 disallows in static compound-SQL (compiled) blocks (for example, DROP, or CREATE etc.).