Oracle笔记 十、PL/SQL存储过程
--create or replace 创建或替换，如果存在就替换，不存在就创建
create or replace procedure p
is
cursor c
is
select * from dept2 for update;
begin
for row_record in c loop
if (row_record.deptno = 30) then
update dept2 set dname = substr(dname, 0, length(dname) - 3) where current of c;
end if;
end loop;
end;
exec p;
begin
p;
end;
--带参存储过程
--in 输入参数，不带in out 默认输入参数
--out 输出参数
--in out 同时带的是输入输入参数
create or replace procedure p2(
a in number,
b number,
s_result out number,
s_temp in out number
)
is
begin
if (a > b) then
s_result := a;
else
s_result := b;
end if;
s_temp := s_temp + 3;
end;
--调用存储过程
declare
v_a number := 4;
v_b number := 6;
v_result number;
v_temp number := 5;
begin
p2(v_a, v_b, v_result, v_temp);
dbms_output.put_line(v_a);
dbms_output.put_line(v_b);
dbms_output.put_line(v_result);
dbms_output.put_line(v_temp);
end;
---删除一个表的过程
create or replace procedure drop_table(tname varchar2)
as
total int := 0;
begin
select count(*) into total from user_tables
where table_name = upper(tname);
if total >= 1 then
execute immediate 'drop table '||tname; --此处必须用动态sql
end if;
end;
select * from user_tables;
--递归存储过程
create or replace procedure pro_emp(sEmpno emp.empno%type, sLevel integer)
is
cursor c is select * from emp where mgr = sEmpno;
prefixStr varchar(255);
begin
for i in 1..sLevel loop
prefixStr := prefixStr || '----';
end loop;
for row_data in c loop
dbms_output.put_line(prefixStr || row_data.ename);
pro_emp(row_data.empno, sLevel + 1);
end loop;
end;
select * from emp;
begin
pro_emp(7839, 0);
end;
