[英]PL/SQL Dynamic SQL
我需要幫助。 我在構造PL / SQL塊時遇到問題。 在游標中,我構造了一個查詢,並且我想在游標上插入一個過濾器。 下面是一個示例:
DECLARE
code NUMBER;
parameters_amb myOthertable%ROWTYPE;
CURSOR test is SELECT id from mytable
if parameters_amb.test2 is not null then
where mytable.name = 'NAMETABLE'
else
where mytable.name = 'NAMETABLE2';
誰能協助我進行這項建設?
您可以使用參數化的游標:
DECLARE
code NUMBER;
parameters_amb myOthertable%ROWTYPE;
param mytable.name%TYPE;
CURSOR test (p_name VARCHAR2) is
SELECT id
FROM mytable
WHERE mytable.name = p_name;
BEGIN
if parameters_amb.test2 is not null then
param := 'NAMETABLE'
else
param := 'NAMETABLE2';
end if;
OPEN test(param);
-- Add code to fetch and read from cursor
END;
DECLARE
stmt varchar2(1000);
code NUMBER;
parameters_amb myOthertable%ROWTYPE;
BEGIN
stmt := 'SELECT id from mytable';
if parameters_amb.test2 is not null
then
stmt := stmt||' where mytable.name = ''NAMETABLE''';
else
stmt := stmt||' where mytable.name = ''NAMETABLE2''';
end if;
OPEN test FOR stmt;
...
...
END;
您可以這樣嘗試:
DECLARE
code NUMBER;
parameters_amb myOthertable%ROWTYPE;
CURSOR test is SELECT id
from mytable
WHERE (parameters_amb.test2 is not null AND mytable.name = 'NAMETABLE' )
OR (parameters_amb.test2 is null AND mytable.name = 'NAMETABLE2' );
或像這樣:
DECLARE
code NUMBER;
parameters_amb myOthertable%ROWTYPE;
CURSOR test is SELECT id
from mytable
WHERE mytable.name =
CASE WHEN parameters_amb.test2 is not null THEN 'NAMETABLE'
WHEN parameters_amb.test2 is null THEN 'NAMETABLE2' END
這是一個簡單的解決方案:
DECLARE代碼NUMBER; parameters_amb myOthertable%ROWTYPE;
CURSOR測試是mytable中的SELECT ID,其中mytable.name = NVL2(parameters_amb.test2,'NAMETABLE','NAMETABLE2');
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