为什么此代码显示参数索引超出范围异常？

Question

值java.sql.SQLException：参数指标超出范围（2>参数的数量，这是1）

我已经检查了所有的答案本主题中却找不到解决方案为我的问题。无论我做了什么改变，都会显示异常情况。 我的代码段：

public void updatetData() { 
    System.out.println("Enter the id of the record you want to update :"); 
    int updateID = sc.nextInt(); 


    if(checkDuplicateId(updateID)){ 
     sql = "UPDATE student SET name = '?', address = '?', email_address = '?', phone_no = '?' WHERE id = ?" ; 
     try(Connection con = dbConn.getConnection(); 
       PreparedStatement stmtUpdate = con.prepareStatement(sql);) { 


      System.out.println("\nEnter the name to update : "); 
      String name = sc.next(); 
      System.out.println("\nEnter the address to update : "); 
      String address = sc.next(); 
      System.out.println("\nEnter the email address to update : "); 
      String email_address = sc.next(); 
      System.out.println("\nEnter the phone no to update : "); 
      String phone_no = sc.next(); 


      stmtUpdate.setString(1, name); 
      stmtUpdate.setString(2, address); 
      stmtUpdate.setString(3, email_address); 
      stmtUpdate.setString(4, phone_no); 
      stmtUpdate.setInt(5, updateID); 

      stmtUpdate.execute(); 
      System.out.println("Updation completed"); 


     } catch (SQLException ex) { 
      System.out.println("Exception in updateData"); 
      ex.printStackTrace(); 
     } 
    } else{ 
     System.out.println("ID doesn't exist!!"); 
    } 
} 

**为checkDuplicateId方法的代码如下：**

private boolean checkDuplicateId(int id){ 
    boolean checkDup = false; 
    String sql1 = "SELECT * FROM student WHERE id = ?"; 
    try(Connection con = dbConn.getConnection(); 
      PreparedStatement stmt = con.prepareStatement(sql1);) { 

     stmt.setInt(1, id); 

     try(ResultSet rs = stmt.executeQuery();){ 
      if(rs.next()) 
       return !checkDup; 
      else 
       return checkDup; 
     } 
    } catch (SQLException ex) { 
     System.out.println("Exception occured in checkduplicate method"); 
     ex.printStackTrace(); 
     return false; 

    } finally{ 


    } 

Answer 1

你的查询只有一个参数，最后?。

UPDATE student SET name = '?', address = '?', email_address = '?', phone_no = '?' WHERE id = ?; 

您使用的是文字串 '？'。删除引号。

UPDATE student SET name = ?, address = ?, email_address = ?, phone_no = ? WHERE id = ?; 

现在你只是设置name，address，email_address和phone_no为 “？”。