The previous steps didn't what's the problem, but appeared this problem as soon as I get to here,

What is the reason will appear this kind of problem???????

CodePudding user response:

No other can literally is a null pointer, reference information, who knows why ah

CodePudding user response:

Whether in oracle table does not allow to insert control, and you insert a null value

CodePudding user response:

refer to the second floor cnceohjm response:

if oracle tables are not allowed to insert the control, and you insert a null value

To step into the oracle table, under normal circumstances, there should be a choice is essentially a database of steps,

CodePudding user response:

reference 1st floor jdsnhan response:

literally is a null pointer, there is no other reference information, who knows why ah

The previous step and online tutorial steps as like as two peas, also didn't go wrong!