我在Oracle application Express 4.2中有一个SQL查询(PL / SQL函数体返回SQL查询)。我创建了一个经典报告,这是我在下面使用的查询。我的查询当前工作正常,但我需要使用另一个查询更新此函数中的现有查询,当我尝试更改查询时它不起作用。我究竟做错了什么?任何帮助表示赞赏。
以下是我的工作查询:
declare
a_query varchar2(5000);
this_strin varchar2(50);
begin
a_query := 'select flight_nmbr, sequence_nmbr '||
'from flights '||
'where sequence_nmbr >= 0 and data_version_name = ''' ||
:P3_DATA_VERSION || '''';
if :P3_SEARCH_NUMBER is not null then
if instr(:P3_SEARCH_NUMBER, '%') > 0 then
this_strin := :P3_SEARCH_NUMBER;
else
this_strin := '%'||:P3_SEARCH_NUMBER||'%';
end if;
a_query := a_query||chr(10)||
' and flight_nmbr like '''|| upper(this_strin) ||'''';
end if;
return a_query;
end;
我需要将此函数内的查询更新为以下内容:
SELECT FLIGHT_NMBR, SCHEDULED_LAUNCH_DATE
FROM FLIGHTS
WHERE DATA_VERSION_NAME = 'WORKING' AND
sequence_nmbr >= 0
ORDER BY (CASE WHEN to_date(scheduled_launch_date, 'DD-MON-YY')
BETWEEN add_months(trunc(sysdate, 'MON'), 0)
AND add_months(trunc(sysdate, 'MON'), 6) THEN 1 ELSE 2 END),
(CASE WHEN to_date(scheduled_launch_date, 'DD-MON-YY')
BETWEEN add_months(trunc(sysdate, 'MON'), 0)
AND add_months(trunc(sysdate, 'MON'), 6)
THEN SCHEDULED_LAUNCH_DATE END),
sequence_nmbr;
我自己尝试这样做,这就是我在下面得到的(这不起作用):
declare
a_query varchar2(5000);
this_strin varchar2(50);
begin
a_query := 'select flight_nmbr, sequence_nmbr '||
'from flights '||
'where sequence_nmbr >= 0 and data_version_name = ''' ||
'ORDER BY (CASE WHEN to_date(scheduled_launch_date, 'DD-MON-YY'
BETWEEN add_months(trunc(sysdate, 'MON'), 0)
AND add_months(trunc(sysdate, 'MON'), 6) THEN 1 ELSE 2 END),
(CASE WHEN to_date(scheduled_launch_date, 'DD-MON-YY') BETWEEN
add_months(trunc(sysdate, 'MON'), 0)
AND add_months(trunc(sysdate, 'MON'), 6) THEN
SCHEDULED_LAUNCH_DATE END),
sequence_nmbr' ||
:P3_DATA_VERSION || '''';
if :P3_SEARCH_NUMBER is not null then
if instr(:P3_SEARCH_NUMBER, '%') > 0 then
this_strin := :P3_SEARCH_NUMBER;
else
this_strin := '%'||:P3_SEARCH_NUMBER||'%';
end if;
a_query := a_query||chr(10)||
' and flight_nmbr like '''|| upper(this_strin) ||'''';
end if;
return a_query;
end;
答案 0 :(得分:5)
它不起作用,因为查询中有很多符号'
。你需要复制每个引用(你只是为第一个和最后一个做了这个),或者使用以下技巧:
a_query := q'[SELECT FLIGHT_NMBR, SCHEDULED_LAUNCH_DATE
FROM FLIGHTS
WHERE DATA_VERSION_NAME = 'WORKING' AND
sequence_nmbr >= 0
ORDER BY (CASE WHEN to_date(scheduled_launch_date, 'DD-MON-YY')
BETWEEN add_months(trunc(sysdate, 'MON'), 0)
AND add_months(trunc(sysdate, 'MON'), 6) THEN 1 ELSE 2 END),
(CASE WHEN to_date(scheduled_launch_date, 'DD-MON-YY')
BETWEEN add_months(trunc(sysdate, 'MON'), 0)
AND add_months(trunc(sysdate, 'MON'), 6)
THEN SCHEDULED_LAUNCH_DATE END),
sequence_nmbr]';
q'[ ... ]'
内的文字可以包含单个qoutes,并且将被视为内部有qoutes的字符串值。
<强> UPD 强>
举例说明这个想法的一个小例子:
select q'[I'm here]' text from dual;
TEXT
--------
I'm here