Question

java.sql.SQLException：参数索引超出范围（2＆gt;参数个数，即1）

我已经检查了本主题中已有的所有答案，但找不到我的问题的解决方案。无论我做什么改变，都会显示异常。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!!");
    }
}

** 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

您的查询只有一个参数，即最后一个?。

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

您使用的是文字字符串＆＃39;？＆＃39;。删除引号。

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

目前您只需将name，address，email_address和phone_no设置为＆＃34;？＆＃34;。

为什么此代码显示参数索引超出范围异常？

1 个答案: