declare
cursor c_emp is select empno, ename, job, sal from emp where job = 'manager';
v_row c_emp%rowtype;
begin
for v_row in c_emp loop
dbms_output.put_line(v_row.empno || '-' || v_row.ename || '-' || v_row.job || '-' || v_row.sal);
end loop;
end;
或者
declare
cursor c_emp is select empno, ename, job, sal from emp where job = 'manager';
v_row emp%rowtype;
begin
for v_row in c_emp loop
dbms_output.put_line(v_row.empno || '-' || v_row.ename || '-' || v_row.job || '-' || v_row.sal);
end loop;
end;
或者
declare
cursor c_emp is select * from emp;
v_row emp%rowtype;
begin
for v_row in c_emp loop
dbms_output.put_line(v_row.empno || '-' || v_row.ename || '-' || v_row.job || '-' || v_row.sal);
end loop;
end;
declare
cursor c_emp is select * from emp;
v_row emp%rowtype;
begin
open c_emp;
loop
fetch c_emp into v_row;
exit when c_emp%notfound;
dbms_output.put_line(v_row.empno || '-' || v_row.ename || '-' || v_row.job || '-' || v_row.sal);
end loop;
close c_emp;
end;
begin
update emp set ename = 'smith' where empno = 7369;
commit;
dbms_output.put_line('sql%rowcount = ' || sql%rowcount);
if sql%isopen then
dbms_output.put_line('sql%isopen');
else
dbms_output.put_line('not sql%isopen');
end if;
if sql%found then
dbms_output.put_line('sql%found');
else
dbms_output.put_line('not sql%found');
end if;
if sql%notfound then
dbms_output.put_line('sql%notfound');
else
dbms_output.put_line('not sql%notfound');
end if;
exception
when no_data_found then
dbms_output.put_line('no_data_found');
when too_many_rows then
dbms_output.put_line('too_many_rows');
end;
declare
cursor c_emp is select * from emp;
v_row emp%rowtype;
begin
open c_emp;
fetch c_emp into v_row;
while c_emp%found loop
dbms_output.put_line(v_row.empno || '-' || v_row.ename || '-' || v_row.job || '-' || v_row.sal);
fetch c_emp into v_row;
end loop;
close c_emp;
end;
declare
cursor c_emp(p_empno number) is select empno, ename, job, sal from emp where empno = p_empno;
v_row emp%rowtype;
begin
for v_row in c_emp(7369) loop
dbms_output.put_line(v_row.empno||v_row.ename||v_row.sal);
end loop;
end;
create table emp1 as select * from emp;declare
cursor c_emp is
select e.empno, e.ename, e.job, e.sal, d.deptno
from emp1 e, dept d
where e.deptno = d.deptno for update of e.deptno;
v_row emp1%rowtype;
v_sal emp1.sal%type;
begin
for v_row in c_emp loop
if v_row.sal < 1500 then
v_sal := v_row.sal * 1.2;
elsif v_row.sal < 2000 then
v_sal := v_row.sal * 1.5;
elsif v_row.sal < 3000 then
v_sal := v_row.sal * 2;
end if;
update emp1 set sal=v_sal where current of c_emp;
end loop;
commit;
end;
鎖住e表中滿足條件的行。
或者
declare
cursor c_emp is select empno, ename, job, sal from emp1 for update;
v_row emp1%rowtype;
v_sal emp1.sal%type;
begin
for v_row in c_emp loop
if v_row.sal < 1500 then
v_sal := v_row.sal * 1.2;
elsif v_row.sal < 2000 then
v_sal := v_row.sal * 1.5;
elsif v_row.sal < 3000 then
v_sal := v_row.sal * 2;
end if;
update emp1 set sal=v_sal where current of c_emp;
end loop;
commit;
end;
鎖住所有行。
或者
declare
cursor c_emp is select empno, ename, job, sal from emp1 for update nowait;
v_row emp1%rowtype;
v_sal emp1.sal%type;
begin
for v_row in c_emp loop
if v_row.sal < 1500 then
v_sal := v_row.sal * 1.2;
elsif v_row.sal < 2000 then
v_sal := v_row.sal * 1.5;
elsif v_row.sal < 3000 then
v_sal := v_row.sal * 2;
end if;
update emp1 set sal=v_sal where current of c_emp;
end loop;
commit;
end;
預設情況下當前會話要一直等待對方釋放鎖，使用nowait子句可以避免等待鎖
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