Oracle笔记 八、PLSQL跳转判断循环语句块

--goto跳转语句
--在goto 后，跳转到相应的语句，然后执行该语句和后面所有语句
begin
dbms_output.put_line('goto开始了');
goto c;
--不被执行
dbms_output.put_line('goto');
dbms_output.put_line('goto');
dbms_output.put_line('goto');
dbms_output.put_line('goto');
<<a>>
dbms_output.put_line('goto aaa');
<<b>>
dbms_output.put_line('goto bbb');
<<c>>
dbms_output.put_line('goto ccc');
end;
--PL/SQL中的sql和rowcount属性：sql代表最近执行的sql语句，rowcount代表最近执行的sql语句影响的行数
declare
vCount number;
vDeptno dept2.deptno%type := 10;
begin
--select count(*) into vCount from dept2;
--update dept2 set dname = dname || '~.~'where deptno = vDeptno; --delete from dept2 where deptno = 40;
insert into dept2 select * from dept;
dbms_output.put_line('count:' || vCount);
dbms_output.put_line(sql%rowcount || '行受影响');
end;
--PL/SQL执行sql语句
begin
execute immediate'create table temp as select * from dept';
end;
--动态sql，把sql语句放到变量中并传递参数
declare
sqlstr varchar2(100);
begin
sqlstr := 'insert into scott.dept values(12, :1, :abc)';
--变量是按照占位符顺序插入的
execute immediate sqlstr using'教务部', '武汉';
end;
select * from scott.dept;
--动态sql,把查询结果赋值给变量
declare
dept_row_data scott.dept%rowtype;
sqlstr varchar2(100);
begin
sqlstr := 'select * from scott.dept where deptno = 11';
execute immediate sqlstr into dept_row_data;
dbms_output.put_line(dept_row_data.deptno);
end;
--if语句
--select * from emp;
declare
vSal emp.sal%type;
begin
select sal into vSal from emp where empno = 7566;
if (vSal < 1200) then
dbms_output.put_line('小于1200');
elsif (vSal < 2000) then
dbms_output.put_line('小于2000');
else
dbms_output.put_line('大于2000');
end if;
end;
--loop循环
declare
i binary_integer := 10;
begin
loop
dbms_output.put_line(i);
i := i - 1;
exit when(i < 1);
end loop;
end;
--while循环
declare
i binary_integer := 1;
begin
while i < 11 loop
dbms_output.put_line(i);
i := i + 1;
end loop;
end;
--for循环
begin
for i in 1..10 loop
dbms_output.put_line(i); end loop;
for i in reverse 1..10 loop dbms_output.put_line(i); end loop;
end;。