DB2---创建返回结果集的函数

/*创建测试表：设置结果集的属性为表字段*/
CREATE TABLE  Test_EXWASTE_EXC
    (
        Test_Time TIMESTAMP ,--
        Test_STATION CHARACTER(6),--
        Test_Three CHARACTER(2) ,--
        Test_Four varchar(3) ,--
        Test_Five varchar(1) ,--
        Test_MODIFY varchar(1) --
)

/*函数的作用：refpk中以‘，’分隔的信息插入到测试表，并返回结果集*/
--/
create FUNCTION Test_Func_GetInfo(REFPK VARCHAR(500)) --REFPK为传入的参数
returns                                               --返回值的类型为table
TABLE(Out_Time TIMESTAMP,
 Out_Station character(6),
 Out_Three character(2),
 Out_Four SMALLINT,
 Out_Five smallint,
 Out_Modify character(1)) 
LANGUAGE SQL
MODIFIES SQL DATA                    --MODIFIES SQL DATA 表示函数中有ddl操作
begin atomic
DECLARE Out_Time TIMESTAMP;
DECLARE Out_Station character(6);
DECLARE Out_Three character(2);
DECLARE Out_Four SMALLINT;
DECLARE Out_Five smallint;
DECLARE Out_Modify character(1);
DECLARE I_INDEX INT;--
DECLARE I_Length INT;
DECLARE I_Locate INT;
DECLARE V_Char character(1);
DECLARE I_Switch INT;
DECLARE I_Return INT;
DECLARE V_Refpk varchar(500);

set I_Return=0;
set I_INDEX=1;
set I_Length=0;
set I_Locate=1;
set I_Switch=0;
set V_Refpk=refpk||‘,‘;
set I_Length=length(V_Refpk);

set I_Return=1;
while I_INDEX<=I_Length do              --将‘,‘分隔的信息取出来
    set V_Char=substr(V_Refpk,I_INDEX,1);
    if V_Char=‘,‘ then
    set I_Switch=I_Switch+1;
           if I_Switch=1 then set Out_Time=timestamp(substr(V_Refpk,I_Locate,I_INDEX-I_Locate));
         elseif I_Switch=2 then set Out_Station=substr(V_Refpk,I_Locate,I_INDEX-I_Locate);
         elseif I_Switch=3 then set Out_Three=substr(V_Refpk,I_Locate,I_INDEX-I_Locate);
         elseif I_Switch=4 then set Out_Four=substr(V_Refpk,I_Locate,I_INDEX-I_Locate);
         elseif I_Switch=5 then set Out_Five=substr(V_Refpk,I_Locate,I_INDEX-I_Locate);
         else set Out_Modify=substr(V_Refpk,I_Locate,I_INDEX-I_Locate);
           end if;
    set I_Locate=I_INDEX+1;
    end if;
    set I_INDEX=I_INDEX+1;
end while;
insert into Test_EXWASTE_EXC values(Out_Time,Out_Station,Out_Three,Out_Four,Out_Five,Out_Modify);
return select * from Test_EXWASTE_EXC ;
end
/

select T.OUT_TIME from table(Test_Func_GetInfo(‘2019-06-10 07:30:40,020801,28,154,0,1‘)) T where T.OUT_TIME=timestamp‘2019-06-10 07:30:40‘
--注意T的字段是函数中定义的字段，与Test_Exwaste_exc无关