Question

我在几个查询中使用的textField.getText（）有问题，所以在第二个查询中textField.getText（）返回null值，不能保存在数据库中

这是我在我的Save_Button

中执行的代码

if (evt.getSource() == btn_save_project) {
            try{
                Statement state = DBConnection.getInstance().createStatement();

                String query1 = "insert into projet values(pro_sequence.nextval,"
                + " '"+txt_projet.getText()+"', (select id_mission from mission "
                + "where nom_mission = '"+txt_mission.getText()+"'))";

                String query2 = "insert into date_etat values('"+txt_date.getText()+"')";

                String query3 = "insert into etat_de_projet values((select "
                + "pro_sequence.currval from dual), (select id_etat from etat where "
                + "nom_etat = '"+cmb_etat.getSelectedItem().toString()+"', '"+txt_date.getText()+"'";

                System.out.println(query1+"\n"+query2+"\n"+query3);

                state.executeUpdate(query1);
                state.executeUpdate(query2);
                state.executeUpdate(query3);

            }catch(Exception e){
                e.printStackTrace();
            }




        }

当我执行时，它在控制台中显示以下内容

insert into projet values(pro_sequence.nextval, 'random', (select id_mission from mission where nom_mission = 'Maintenance'))
insert into date_etat values('')
insert into etat_de_projet values((select pro_sequence.currval from dual), (select id_etat from etat where nom_etat = 'Debut', ''

java.sql.SQLIntegrityConstraintViolationException: ORA-01400: impossible d'insérer NULL dans ("MYPROJECT"."DATE_ETAT"."ETAT_DATE")

最后一行告诉我们在date_etat

中插入空值是不可能的

有什么帮助吗？

在多个更新查询中使用的textfield.getText在第二个查询中返回null

0 个答案: