Question

我有这个数据库表：

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)
);

当我运行此代码时，我收到一个错误：参数索引超出范围（8>参数个数，即7）。我也尝试过改变setString(1,fn)，但它没有用。

 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

您的查询中有一个额外的逗号，您的列数应从1开始。

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

您传递的是8列和7个变量，count不匹配。

确定如果：

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

应该是这样的：

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

Answer 3

相对于查询的参数编号

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

更正：

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

和

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)");

注意：++c是预增量运算符。它将c的当前值加1（将c设置为此值）并使用c的新值。

参数索引超出范围（8>参数个数，即7）

4 个答案: