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[英]Java Parameter Index Out Of Range (2 > number of parameters, which is 1)
[英]Error in Java code :Parameter index out of range (1 > number of parameters, which is 0)
如果數據庫中存在該行,我正在嘗試驗證用戶名和密碼。 但我得到的參數索引超出范圍(1 > 參數數量,即 0)。 請幫忙
Scanner in = new Scanner(System.in);
String password = in .next();
String username = in .next();
PreparedStatement ps =
connect.prepareStatement
( "select LastName,BirthDate from employees where LastName= '" + username + "' and BirthDate = '" + password + "'" );
ps.setString (1, username);
ps.setString (2, password);
ResultSet rs = ps.executeQuery();
if (rs.next()) {
System.out.println("login completed");
} else {
// Quest not completed yet
System.out.println("login failed");
}
您將字符串連接與設置准備好的語句參數混合在一起。 您應該只使用兩者之一,最好是后者。 您的代碼應如下所示:
PreparedStatement ps = connect.prepareStatement (
"select LastName,BirthDate from employees where LastName=? and BirthDate=?"
);
ps.setString (1, username);
ps.setString (2, password);
ResultSet rs = ps.executeQuery();
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