我想从我的前端JSP和另一个名为questions
的表中向表questionpaper
添加一些细节。将jsp和MySQL中的表中的值添加到MySQL中的另一个表中
在表questionpaper
我有一个名为ExamID
的列,我必须从名为question
的另一个表中添加一个值ExamId column
。这个ExamId value
必须与从JSP页面添加的数据同时添加。来自JSP页面的数据被添加,没有任何错误,但不能同时添加ExamId
。
public int QuestionPaper(Questions paramQues) {
// TODO Auto-generated method stub
String query ="insert into questionpaper(Question,Opt1,Opt2,Opt3,Opt4,Answer,Marks,NegMarks,ExamId)values(?,?,?,?,?,?,?,?,?)";
int status=0;
try
{
Class.forName("com.mysql.jdbc.Driver");
Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/onlineexam", "root", "admin");
PreparedStatement stat1 = con.prepareStatement(query);
if((paramQues.getAns1()!=null)&&(paramQues.getAns2()!=null)&&(paramQues.getAns3()!=null)&&(paramQues.getAns4()!=null)&&(paramQues.getMarks()!=null)&&(paramQues.getNegM()!=null)&&(paramQues.getQues()!=null))
{
System.out.println("implementation "+paramQues.getOption());
System.out.println("Marks-->"+paramQues.getMarks());
System.out.println("Ans->>"+paramQues.getAns1());
stat1.setString(1,paramQues.getQues());
stat1.setString(2,paramQues.getAns1());
stat1.setString(3,paramQues.getAns2());
stat1.setString(4,paramQues.getAns3());
stat1.setString(5,paramQues.getAns4());
stat1.setString(6,paramQues.getOption());
stat1.setInt(7,paramQues.getMarks());
stat1.setInt(8,paramQues.getNegM());
System.out.println("Ans->>"+paramQues.getAns1());
String query2="SELECT * FROM questions ORDER BY ExamId DESC LIMIT 1";
PreparedStatement stat2 = con.prepareStatement(query2);
ResultSet rs1 = stat2.executeQuery(query2);
Integer Examid= rs1.getInt("ExamId");
System.out.println("exam id-->"+Examid);
stat1.setInt(9,Examid);
stat1.executeUpdate();
Integer TotalQues= rs1.getInt("TotalQuestions");
String query3="SELECT * FROM questionpaper ORDER BY PaperId DESC LIMIT 1";
PreparedStatement stat3 = con.prepareStatement(query3);
ResultSet rs2 = stat3.executeQuery(query3);
Integer PaperId= rs2.getInt("PaperId");
if(PaperId<=TotalQues)
status=1;
else
status=0;
}
}
catch (Exception e)
{
System.out.println("Exception in FacultyTry->" + e);
}
return status;
}
输出
Answer:l
j
d
d
options-->o3
Marks-->2
NegMarks-->1
implementation o3
Marks-->2
Ans->>l
Ans->>l
Exception in FacultyTry->java.sql.SQLException
,使用打印堆栈跟踪e.printStackTrace(System.out中)和正确识别哪些行trows异常,并张贴行 – 2014-10-19 17:08:16
您的表名称是“问题”还是“问题”?你有没有检查你的SQL查询?那是否包含适当的表名和列名? – OO7 2014-10-19 17:37:14