PWM测试 参考链接 1 Enable PWM on BeagleBone with Device Tree overlays 2Using PWM on the Beaglebone Black 3 Beaglebone Coding 101: Buttons and PWM 4 Using PWM outputs 5 beaglebone-black-cpp-PWM 6 Enabling PWM Support in the kernel 7 Beaglebone Back学习五(PWM测试
---------------事务---当执行到commit时 事务才算是完成,不然 会执行rollback操作. declare v_money acount.money%type:=1223; ex exception; begin update acount set money=money-v_money where id=1; raise ex; update acount set money=money+v_money where id=2; commit; exception whe