参数索引超出范围（8>参数数量，即7）

Question

I have this database table:

create table users(
    id int not null auto_increment,
    fn varchar(30),
    ln varchar(30),
    sex char,
    email varchar(60),
    country varchar(40),
    username varchar(30),
    password varchar(100),
    primary key(id)
);

When I run this code, I am getting an error: Parameter index out of range (8 > number of parameters, which is 7). I also tried changing setString(1,fn) but it's not working.

 try{
     String INSERT="INSERT INTO users (fn,ln,,sex,email,country,username,password) VALUES (?,?,?,?,?,?,?)";
     PreparedStatement pst=conn.prepareStatement(INSERT);
     System.out.println("Created prepared statement");

     pst.setString(2,"fn");
     pst.setString(3,"ln");
     pst.setString(4,"sex");
     pst.setString(5,"email");
     pst.setString(6,"country");
     pst.setString(7,"username");
     pst.setString(8,"password)");
     pst.executeUpdate();
 }

Answer 1

you have an extra comma in your query and your column count should start from 1.

String INSERT="INSERT INTO users (fn,ln,sex,email,country,username,password) VALUES (?,?,?,?,?,?,?)";
pst.setString(1,"fn");
    pst.setString(2,"ln");
    pst.setString(3,"sex");
    pst.setString(4,"email");
    pst.setString(5,"country");
    pst.setString(6,"username");
    pst.setString(7,"password)");
    pst.executeUpdate();

Answer 2

You are passing 8 columns and 7 variables, count doesn't match.

Make sure if this:

String INSERT="INSERT INTO users (fn,ln,,sex,email,country,username,password) VALUES (?,?,?,?,?,?,?)";

should be like this:

String INSERT="INSERT INTO users (fn,ln,sex,email,country,username,password) VALUES (?,?,?,?,?,?,?)";

Answer 3

Parameter number relative to the query

pst.setString(1,"fn");
pst.setString(2,"ln");
pst.setString(3,"sex");
pst.setString(4,"email");
pst.setString(5,"country");
pst.setString(6,"username");
pst.setString(7,"password)");
pst.executeUpdate();

Answer 4

Corrections:

String INSERT="INSERT INTO users (fn,ln,sex,email,country,username,password) VALUES (?,?,?,?,?,?,?)";

and

short c = 0;
    //using a counter variable (short or int) means
    //no worries about numbering - just maintain the order below
pst.setString(++c,"fn");
pst.setString(++c,"ln");
pst.setString(++c,"sex");
pst.setString(++c,"email");
pst.setString(++c,"country");
pst.setString(++c,"username");
pst.setString(++c,"password)");

Note: ++c is pre-increment operator. It adds 1 to the current value of c (sets c to this) and uses the new value of c .