DB2 存储函数
2022/3/29 19:26:36
本文主要是介绍DB2 存储函数,对大家解决编程问题具有一定的参考价值,需要的程序猿们随着小编来一起学习吧!
创建fuction:根据年份和周数,获取到当周开始日期
-- Generate SQL -- Version: V7R1M0 100423 -- Generated on: 03/29/22 12:08:46 -- Relational Database: S685D13X -- Standards Option: DB2 for i SET PATH "QSYS","QSYS2","SYSPROC","SYSIBMADM","KT" ; CREATE FUNCTION KTGL.GET_DOT_SDATE ( INYY NUMERIC(4, 0) , INWW NUMERIC(2, 0) ) RETURNS CHAR(10) LANGUAGE SQL SPECIFIC KTGL.GET_DOT_SDATE NOT DETERMINISTIC READS SQL DATA CALLED ON NULL INPUT SET OPTION ALWBLK = *ALLREAD , ALWCPYDTA = *OPTIMIZE , COMMIT = *NONE , DECRESULT = (31, 31, 00) , DFTRDBCOL = *NONE , DYNDFTCOL = *NO , DYNUSRPRF = *USER , SRTSEQ = *HEX BEGIN ---------------------------------------------------------------------------- -- ---------------------------------------------------------------------------- ------------------------------------------------------------- -- WORK AREAS ------------------------------------------------------------- DECLARE W_RESULT CHAR ( 10 ) ; -------------------------------------------- -- SELCODE DEFINE -------------------------------------------- SET W_RESULT = ( SELECT CHAR ( DATE + ( WEEK + DAY ) DAY ) AS DATE FROM ( SELECT DATE ( TIMESTAMP_FORMAT ( CHAR ( INYY || '0101' ) , 'YYYYMMDD' ) ) DATE , ( CAST ( INWW AS INTEGER ) - 1 ) * 7 WEEK , CASE DAYNAME ( TIMESTAMP_FORMAT ( CHAR ( INYY || '0101' ) , 'YYYYMMDD' ) ) WHEN '星期一' THEN 0 WHEN '星期二' THEN - 1 WHEN '星期三' THEN - 2 WHEN '星期四' THEN - 3 WHEN '星期五' THEN 3 WHEN '星期六' THEN 2 WHEN '星期天' THEN 1 END AS DAY FROM SYSIBM . SYSDUMMY1 ) A ) ; RETURN W_RESULT ; END ; GRANT ALTER , EXECUTE ON SPECIFIC FUNCTION KTGL.GET_DOT_SDATE TO QUSER ;
使用function
SELECT KTGL.GET_DOT_SDATE(2021,01) FROM SYSIBM.SYSDUMMY1 ; --DB虚拟表
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