PL/SQL里面执行DDL语句
begin
execute immediate 'create table T(nnn varchar2(20) default ''aaa'')';
end;
PL/SQL的分支语句： declare
v_sal emp.sal%type; begin
select sal into v_sal from emp where empno=7369;
if(v_sal<1200) then
dbms_output.put_line('low');
elsif(v_sal<2000) then
dbms_output.put_line('middle');
else
dbms_output.put_line('high');
end if;
end;
pL/Sql循环
declare
i binary_integer:=1;
begin
loop
dbms_output.put_line(i);
i:=i+1;
exit when(i>=11);
end loop;
end;
PL/SQL for循环
begin
for k in 1..10 loop
dbms_output.put_line(k);
end loop;
for k in reverse 1..10 loop dbms_output.put_line(k);
end loop;
end;
exception 捕获异常 declare
v_temp number(4);
begin
select empno into v_temp from emp where deptno=10; exception
when too_many_rows then
dbms_output.put_line('太多记录了');
when others then
dbms_output.put_line('error');
end;
没有数据错误 declare
v_temp number(4);
begin
select empno into v_temp from emp where deptno=2222; exception
when no_data_found then
dbms_output.put_line('没数据');
when others then
dbms_output.put_line('error');
end;
/ 错误处理
create table errorlog (
id number primary key, errcode number, errmsg varchar2(1024), errdate date
);
create sequence seq_errorlog_id start with 1 increment by 1;
declare
v_deptno dept.deptno%type:=10; v_errcode number;
v_errmsg varchar2(1024);
begin
delete from dept where deptno=v_deptno; exception when others then rollback;
v_errcode:=SQLCODE; v_errmsg:=SQLERRN;
insert into errorlog values(seq_errorlog_id.nextval,v_errcode,v_errmsg,sysdate);
commit;
end;
游标
declare
cursor c is
select * from emp;
v_emp c%rowtype;
begin
open c;
fetch c into v_emp; --(取游标的第一个值插入v_emp，在不断的循环) dbms_output.put_line(v_emp.ename); close c; end; 例子 declare
cursor c is
select * from emp;
v_emp c%rowtype;
begin
open c;
loop
fetch c into v_emp;
exit when(c%notfound);
dbms_output.put_line(v_emp.ename);
end loop;
close c;
end;
declare
cursor c is
select * from emp;
v_emp c%rowtype;
begin
open c;
fetch c into v_emp;
while(c%found) loop
dbms_output.put_line(v_emp.ename);
fetch c into v_emp;
end
loop;
close c;
end;
declare
cursor c is
select * from emp;
begin
for v_emp in c loop
dbms_output.put_line(v_emp.ename);
end loop;
end;
带参数的游标
declare
cursor c(v_deptno emp.deptno%type,v_job emp.job%type)
is
select ename,sal from emp where deptno=v_deptno and job=v_job;
begin
for v_temp in c(30,'chick') loop
dbms_output.put_line(v_temp.ename);
end loop;
end;
可更新的游标
exec p执行存储过程
begin
p:
end;
带参数的存储过程
create or replace procedure p
(v_a in number,v_b number,v_ret out number, v_temp in out number)
is
begin
if(v_a>v_b) then v_ret:=v_a;
else v_ret:=v_b;
end
if;
v_temp:=v_temp+1;
end;
调用存储过程 declare v_a number:=3;
v_b number:=4;
v_ret number;
v_temp number:=5;
begin
p(v_a,v_b,v_ret,v_temp);
dbms_output.put_line(v_ret);
dbms_output.put_line(v_temp);
end;
show error返回错误信息 删除存储过程 存储过程中的函数
create or replace function sal_tax (v_sal number)
return number is
begin
if(v_sal<2000) then
return 0.10; elsif(v_sal<2750) then
return 0.5;
else
return 0.20;
end if;
end;
触发器 create or replace trigger trig
after update on dept
for each row
begin
update emp set deptno=:NEW.deptno where deptno=:OLD.deptno;
end; /