Netezza Netteza动态SQL布尔(任意)语句
对于这个例子,我想在Netezza中使用动态sql。但我不能。 通常,我想知道是否可以对不需要“立即执行”的代码部分使用动态实例。例如,If-else语句的条件。当我在一行中有几个语句时,我基本上不知道如何使用动态sql。如有任何意见,我们将不胜感激Netezza Netteza动态SQL布尔(任意)语句,netezza,Netezza,对于这个例子,我想在Netezza中使用动态sql。但我不能。 通常,我想知道是否可以对不需要“立即执行”的代码部分使用动态实例。例如,If-else语句的条件。当我在一行中有几个语句时,我基本上不知道如何使用动态sql。如有任何意见,我们将不胜感激 CREATE OR REPLACE PROCEDURE "SP_Count_Ndays_between_date1_date2_where" (DATE, DATE, varchar(400), varchar(400)) RETURNS INT
CREATE OR REPLACE PROCEDURE "SP_Count_Ndays_between_date1_date2_where" (DATE, DATE, varchar(400), varchar(400))
RETURNS INTEGER
LANGUAGE NZPLSQL AS
BEGIN_PROC
DECLARE
START_DATE ALIAS FOR $1;
END_DATE ALIAS FOR $2;
whichweekdays ALIAS FOR $3;
whichdaysofmonth ALIAS FOR $4;
CURR_DATE DATE;
DAY_COUNT INT;
sql varchar(40000);
BEGIN
DAY_COUNT = 0;
CURR_DATE = START_DATE;
WHILE CURR_DATE <= END_DATE
LOOP
IF '(extract(dow from CURR_DATE) IN'|| whichweekdays||' and extract(day from CURR_DATE) IN'|| whichdaysofmonth||')'
THEN DAY_COUNT = DAY_COUNT + 1;
End if ;
CURR_DATE = CURR_DATE + 1;
END LOOP;
RETURN DAY_COUNT;
END;
END_PROC;
创建或替换过程“SP_Count_Ndays_介于_date1_date2_where之间”(日期,日期,varchar(400),varchar(400))
返回整数
语言nzplsqlas
开始程序
声明
$1的起始日期别名;
$2的结束日期别名;
其工作日别名为3美元;
其每月别名为$4;
当前日期;
日积月累;
sql-varchar(40000);
开始
天数=0;
当前日期=开始日期;
而CURR_DATE可以混合使用静态和动态SQL来解决这个问题
保留外部循环,然后在外部循环的每个步骤上创建动态SQL字符串。然后在一个内部FOR in EXECUTE循环块中使用该结果
从中挖掘布尔结果,执行非动态IF-THEN,然后继续循环
CREATE OR REPLACE PROCEDURE SP_Count_Ndays_between_date1_date2_where (DATE, DATE, varchar(400), varchar(400))
RETURNS INTEGER
LANGUAGE NZPLSQL AS
BEGIN_PROC
DECLARE
START_DATE ALIAS FOR $1;
END_DATE ALIAS FOR $2;
whichweekdays ALIAS FOR $3;
whichdaysofmonth ALIAS FOR $4;
CURR_DATE DATE;
DAY_COUNT INT;
sql varchar(40000);
vResult record;
BEGIN
DAY_COUNT = 0;
CURR_DATE = START_DATE;
WHILE CURR_DATE <= END_DATE
LOOP
sql := 'SELECT (
extract(dow from ''' || CURR_DATE|| '''::DATE) IN ('|| whichweekdays||') and extract(day from ''' || CURR_DATE || '''::DATE) IN ('|| whichdaysofmonth|| ')
) bool_test' ;
RAISE NOTICE '%', sql;
for vResult in execute sql LOOP
RAISE NOTICE 'Date: %, Test Result %', CURR_DATE, vResult.bool_test;
IF vResult.bool_test then
DAY_COUNT = DAY_COUNT +1;
END IF;
END LOOP;
CURR_DATE = CURR_DATE + 1;
END LOOP;
RETURN DAY_COUNT;
END;
END_PROC;
谢谢,这帮了大忙。:)
TESTDB.ADMIN(ADMIN)=> exec SP_Count_Ndays_between_date1_date2_where (CURRENT_DATE, CURRENT_DATE + '4 days'::interval, '4,5,6', '7,8,9,10,11');
NOTICE: SELECT (
extract(dow from '2015-08-07'::DATE) IN (4,5,6) and extract(day from '2015-08-07'::DATE) IN (7,8,9,10,11)
) bool_test
NOTICE: Date: 2015-08-07, Test Result t
NOTICE: SELECT (
extract(dow from '2015-08-08'::DATE) IN (4,5,6) and extract(day from '2015-08-08'::DATE) IN (7,8,9,10,11)
) bool_test
NOTICE: Date: 2015-08-08, Test Result f
NOTICE: SELECT (
extract(dow from '2015-08-09'::DATE) IN (4,5,6) and extract(day from '2015-08-09'::DATE) IN (7,8,9,10,11)
) bool_test
NOTICE: Date: 2015-08-09, Test Result f
NOTICE: SELECT (
extract(dow from '2015-08-10'::DATE) IN (4,5,6) and extract(day from '2015-08-10'::DATE) IN (7,8,9,10,11)
) bool_test
NOTICE: Date: 2015-08-10, Test Result f
NOTICE: SELECT (
extract(dow from '2015-08-11'::DATE) IN (4,5,6) and extract(day from '2015-08-11'::DATE) IN (7,8,9,10,11)
) bool_test
NOTICE: Date: 2015-08-11, Test Result f
SP_COUNT_NDAYS_BETWEEN_DATE1_DATE2_WHERE
------------------------------------------
1
(1 row)