问题
Like Oracle, DB2 supports parameter defaults in stored procedures. Oracle syntax:
CREATE OR REPLACE PROCEDURE p_default (
p_in_number IN number := 0,
p_out_number OUT number,
p_in_varchar IN varchar2 := '0',
p_out_varchar OUT varchar2,
p_in_date IN date := date '1981-07-10',
p_out_date OUT date
)
DB2 syntax:
CREATE PROCEDURE p_default (
IN p_in_number INTEGER DEFAULT(0),
OUT p_out_number INTEGER,
IN p_in_varchar VARCHAR(10) DEFAULT('0'),
OUT p_out_varchar VARCHAR(10),
IN p_in_date DATE DEFAULT('1981-07-10'),
OUT p_out_date DATE
)
With Oracle, I can discover defaults using this query:
SELECT argument_name, defaulted FROM all_arguments WHERE object_id = :proc_id
How can I discover this in DB2 selecting from SYSCAT tables? I don't see any useful column in SYSCAT.PROCPARMS or SYSCAT.FUNCPARMS. Note, I don't mind calling any stored procedure from SYSPROC if such a procedure exists...
Note, I have asked as similar question about SQL Server:
Discover SQL Server procedure default parameters using SYS or INFORMATION_SCHEMA tables
回答1:
(This assumes you're looking for the information on DB2 Linux/Unix/Windows, it may vary for other platforms)
You can use the SYSCAT.ROUTINEPARMS catalog view to find this information. It lists all the parameter types that the function can accept (there can be multiple rows if the procedure has multiple signatures), and if applicable, their default (in the aptly-named DEFAULT column). If a default is not supplied, that column will be NULL.
For example, if you wanted to see the input parameters for SYSIBMADM.SUBMIT (which has optional parameters), you could use this query:
SELECT *
FROM SYSCAT.ROUTINEPARMS
WHERE ROUTINESCHEMA='SYSIBMADM'
AND ROUTINENAME ='SUBMIT'
AND ROWTYPE IN ('B', 'P')
ROWTYPE of B allows for both input and output variables, and P is for input-only. The other types are covered in the Info Center doc I linked above.
来源：https://stackoverflow.com/questions/9838076/discover-db2-procedure-default-parameters-using-syscat-tables