mysql – 操作数应该包含java中的1列

参见英文答案 > MySQL Syntax error message “Operand should contain 1 column(s)”                                    5个

String  sql = "SELECT (Employee_name, Password) FROM employee WHERE (Employee_name = '"+name+"'  AND Password = '"+password+"')";

并在JSP中获得以下异常
java.sql.sqlexception插入操作数应包含1列

请帮忙.

解决方法:

正确的方法是

String  sql = "SELECT Employee_name, Password FROM employee WHERE Employee_name = '"+name+"'  AND Password = '"+password+"'";

您可以在where子句中使用keep(),但不能在select列表中使用.
这就是你的情况

mysql> select (firstname,email) from users limit 1 ;
ERROR 1241 (21000): Operand should contain 1 column(s)

标签：mysql,mysql-error-1241
来源： https://codeday.me/bug/20190823/1695628.html