DB2创建function（一）

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CREATE FUNCTION "FAS"."GET_ALL_NAME"
( "A_ID" BIGINT
)

  RETURNS
VARCHAR(9000)

  SPECIFIC "SQL131107190046233"--SPECIFIC名称不能与其他FUNCTION的重复

  LANGUAGE SQL

  NOT
DETERMINISTIC

  EXTERNAL ACTION

  READS SQL DATA

  CALLED ON
NULL
INPUT

  INHERIT ISOLATION
LEVEL WITHOUT LOCK REQUEST

  INHERIT SPECIAL REGISTERS

BEGIN ATOMIC

  --声明变量

  DECLARE
A_CURR_ID BIGINT
DEFAULT 0 ;

  DECLARE
A_CURR_NAME VARCHAR(50) DEFAULT
‘‘ ;

  DECLARE
SRETURN VARCHAR(1000) DEFAULT
‘‘ ;

  --设置变量值

  SET
A_CURR_NAME= (SELECT
NAME FROM FA_DEPARTMENT WHERE
ID=A_ID);--当前名称

  SET
A_CURR_ID= (SELECT
PARENT_ID FROM
FA_DEPARTMENT WHERE
ID=A_ID);--当前名称

  SET
SRETURN=‘_‘||A_CURR_NAME;

  --WHILE循环

  WHILE A_CURR_ID>0 DO

  SET
A_CURR_NAME= (SELECT
NAME FROM FA_DEPARTMENT WHERE
ID=A_CURR_ID);--当前名称

  SET
A_CURR_ID= (SELECT
PARENT_ID FROM
FA_DEPARTMENT WHERE
ID=A_CURR_ID);--当前名称

   SET
SRETURN=‘_‘||A_CURR_NAME||SRETURN;

  END
WHILE;

  --返回值

  RETURN
SRETURN;

END;

1

select GET_ALL_NAME(21) from
SYSIBM.SYSDUMMY1