准備好的陳述

Question

我該如何編寫准備好的聲明而不是此：請幫助我

String qry= "INSERT INTO 
Registration1(RegistrationNo,Date,SeniorPerson,NativePlace,Kul,Gotra,KulSwami,ResidensialAddress,PinCode,STDcode,TelephoneNo,MobileNo,Email,Website,Education,Branch,BirthDate,BloodGroup) VALUES('"+regno+"','"+dt+"','"+nm+"','"+place+"','"+kul+"','"+gotra+"','"+kswami+"','"+raddr+"','"+pincode+"','"+stdcd+"','"+tele+"','"+mno+"','"+email+"','"+website+"','"+education+"','"+branch+"','"+bdt+"','"+bloodgrp+"')";
stmt.executeUpdate(qry);

Answer 1

PreparedStatement stmt = conn.prepareStatement("INSERT INTO Registration1(RegistrationNo,Date,SeniorPerson,NativePlace,Kul,Gotra,KulSwami,ResidensialAddress,PinCode,STDcode,TelephoneNo,MobileNo,Email,Website,Education,Branch,BirthDate,BloodGroup) VALUES(?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)");

int col = 1;
stmt.setString(col++, regno);
stmt.setDate(col++, new java.sql.Date(dt.getTime()));  // assuming dt is a java.util.Date
(etc)

stmt.executeUpdate();

Answer 2

    `enter code here`you can use prepared statement of insertion like..


         Connection MyCon=null;
         PreparedStatement Ps=null;
try{
          myCon=(Connection) DriverManager.getConnection("jdbc:mysql://localhost:3306/demo","student","student");   
       // these are string from where we can take inputs .
         String Fname;
         String Lname;
         String email;
         String department;
         String Salary;


         Fname=JOptionPane.showInputDialog(null,"Enter First Name");
         Lname=JOptionPane.showInputDialog(null,"Enter Last Name");
         email=JOptionPane.showInputDialog(null,"Enter Your Email");
         department=JOptionPane.showInputDialog(null,"Enter Department Name");
         Salary=JOptionPane.showInputDialog(null,"Enter Salary Name");

            **String insertion="insert into employees"
                   + "(first_name, last_name, email, department ,salary )"+"values "
                    + "(?,?,?,?,?)";**

             **Ps=(PreparedStatement) MyCon.prepareStatement(insertion);
               Ps.setString(1,Fname);
                 Ps.setString(2,Lname);
                 Ps.setString(3,email);
                 Ps.setString(4,department);
                 Ps.setString(5,Salary);

        Ps.executeUpdate();**
}catch(Exception e)
{
e.printtrace();
}

Answer 3

您應該使用此模板：

PreparedStatement pstmt = con .prepareStatement ("INSERT INTO TableName (ColumnNmae1, ColumnNmae2, ColumnNmae3...) VALUES (?,?,?...);
    pstmt.setType(1, value);
    pstmt.setType(2, value);
    pstmt.setType(3, value);
    etc.

在准備好的狀態中，您需要使用與陳述中處理的列完全相同的問號數量。

對於您應該設置setValue的每個問號，您需要為EAC值類型選擇正確的設置，其中有setString setInt等。

在您的特定情況下，它應如下所示：

PreparedStatement pstmt = con .prepareStatement ("INSERT INTO TableName (RegistrationNo,Date,SeniorPerson...) VALUES (?,?,?...);
pstmt.setString(1, regno);
pstmt.setDate(2, Date);
pstmt.setString(3, SeniorPerson);
etc.

Answer 4

您的示例說明了如何不使用PreparedStatement 。

這是一個更好的主意：

// Here's a PreparedStatement to satisfy the person who downvoted.
PreparedStatement stmt = connection.prepareStatement();
// I might have missed a '?' - you should check it.
String qry= "INSERT INTO    Registration1(RegistrationNo,Date,SeniorPerson,NativePlace,Kul,Gotra,KulSwami,ResidensialAddress,PinCode,STDcode,TelephoneNo,MobileNo,Email,Website,Education,Branch,BirthDate,BloodGroup) VALUES(?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?)";
// Bind the variables here
stmt.executeUpdate(qry);

你應該通過這個精心。