Java----使用者互動Scanner
阿新 • • 發佈：2021-06-28
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Oracle
儲存過程
是儲存在資料庫裡的
pl/sql語言基礎
- 遊標
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declare
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cursor name is select......
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begin
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open name;
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loop
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fetch name into ....
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exit when name%notfound;
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end loop;
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close name;
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end;
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declare
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cursor name is ...
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begin
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open name;
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fetch name into ....
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while name%found loop
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...
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fetch name into ......;
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end loop;
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close loop;
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end;
%found:判斷最近一次使用fetch語句是否從快取中檢索導資料，如果檢索到資料，返回true，否則返回false;(經常與while連用)
%notfound:判斷最近一次使用fetch語句是否從快取中檢索導資料，如果沒有檢索到資料，返回true，否則返回false;(經常與when連用)
pl/sql程式開發
- 儲存過程
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create or replace procedure lisi(
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id student.studentId%type,
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na student.name%type)
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as
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begin
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update student set studentId=id, name=na where studentId=id;
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exception
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when others then
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DBMS_OUTPUT.PUT('無法修改');
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end;
- 函式
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create or replace function jindao
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return number
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as
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c number;
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begin
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select COUNT(*) into c from student where name='金導';
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return c;
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end jindao;
- 包
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create or replace package pkg
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as
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procedure hello;
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FUNCTION getid(id number) return number;
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end pkg;
- 包體
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create or replace package body pkg
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as
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procedure hello
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as
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begin
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dbms_output.put_line('hello');
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end hello;
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FUNCTION getid(id number) return number
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as
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begin
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return id;
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end getid;
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end pkg;
- 呼叫包
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declare
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c number;
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begin
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pkg.hello;
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c:=pkg.getid(1);
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DBMS_OUTPUT.put_line(c);
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end;
- 觸發器
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create or replace trigger jindaogrant
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after update or delete on student
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begin
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DBMS_OUTPUT.put_line('觸發器發現你了');
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end;