--普通變數
/*declare
u_name varchar2(20):='zhang san';
begin
dbms_output.put_line(u_name);
end;
*/--獲取使用者輸入
/*declare
u_name varchar2(20):='&aaa';
begin
dbms_output.put_line('hello '||u_name);
end;
*/--根據使用者輸入的年齡判斷
/*declare
u_age number :=&age;
msg varchar2(100);
begin
if u_age<18 then
msg:='年齡太小';
elsif u_age <30 then
msg:='您可以註冊';
else
msg:='年齡太大';
end if;
dbms_output.put_line(msg);
end;
*/--判斷範圍
/*declare
u_age number :=&age;
msg varchar2(100);
begin
case
when u_age<18 then msg:='太小';
when u_age<50 then msg:='正好';
else
msg:='太大';
end case;
dbms_output.put_line(msg);
end;
*//*
declare
u_age number :=&age;
msg varchar2(100);
begin
case u_age
when 18 then msg:='太小';
when 50 then msg:='正好';
else
msg:='太大';
end case;
dbms_output.put_line(msg);
end;
*/--根據使用者輸入數字，迴圈輸出
/*declare
u_num number:=&nums;
i number:=0;
begin
loop
dbms_output.put_line(i);
i:=i+1;
if i>u_num then
exit;
end if;
end loop;
end;
*//*
declare
u_num number:=&nums;
i number:=0;
begin
while i
declare
ename varchar2(10);
job varchar2(10);
cursor cur_emp is
select ename,job from emp where empno=7369;
begin
open cur_emp;
fetch cur_emp into ename,job;
if cur_emp%notfound then
dbms_output.put_line('沒有資料');
else
dbms_output.put_line(ename||'*****'||job);
end if;
end;
*/--loop
declare
ename varchar2(10);
job varchar2(10);
cursor cur_emp is
select ename,job from emp
where sal>2000;
begin
open cur_emp;
loop
fetch cur_emp into ename,job;
if cur_emp%notfound then
exit;
end if;
dbms_output.put_line(ename||' '||job);
end loop;
close cur_emp;
end;
---while
declare
ename varchar2(10);
job varchar2(10);
cursor cur_emp is
select ename,job from emp
where sal>2000;
begin
open cur_emp;
fetch cur_emp into ename,job;
while cur_emp%fount loop
dbms_output.put_line(ename||' '||job);
fetch cur_emp into ename,job;
end loop;
close cur_emp;
end;
---for
declare
fname varchar2(20);
lname varchar2(20);
cursor t_student is select firstname, lastname from students where id<=1005 ;
begin
for t_students in t_student loop
fname:=t_students.firstname;
lname:=t_students.lastname;
dbms_output.put_line('學員姓名:'||fname||''||lname);
end loop;
end;
declare
emp_count number;
begin
select count(empno) into emp_count from emp;
dbms_output.put_line(emp_count);
end;
PL SQL基礎語法
1.分支結構 pl sql中，使用if關鍵字作為分之結構的程式起始段。總體有以下幾種分支結構 1 if condition then statement end if 2 if condition then statement else then statement end if 3 if cond...
PL SQL語法 游標
oracle中的游標分為顯式游標和隱式游標。隱式游標是系統自動為你建立的。顯式游標是使用者通過建立cursor的方式來建立。在oracle中有三種型別的游標 1 不帶引數的游標 eg cursor customer cur is select from customer s 2 帶引數的游標 eg ...
PLSQL語法基礎
變數普通變數宣告方式示例 created on 2019 7 17 by zhou declare v name varchar 20 v sal number v addr varchar 20 begin v name 張三 v sal 10000 select 長沙 into v addr f...