[英]Parameter index out of range (8 > number of parameters, which is 7)
我有此数据库表:
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)
);
运行此代码时,出现错误:参数索引超出范围(8>参数数量,即7)。 我也尝试更改setString(1,fn)
但是它不起作用。
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();
}
您的查询中有一个逗号,并且列数应从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();
您正在传递8列和7个变量,计数不匹配。
确保是否:
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 (?,?,?,?,?,?,?)";
相对于查询的参数号
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();
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c
(为此设置c
)并使用c
的新值。
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