如何通过使用MySQL的选择查询获取行数

Question

I'm new in golang. I want to create a login verification from MySQL db. I want a method like as in PHP mysqli_num_rows($res) == 1... I tried len(rows) or rows.Column() @fmt.Println("No of rows are :", rows) but it won't... The code which i tried ... (It is a dummy code)

rows, err := db.Query("select * from userLog where u_name = ? and u_pass = ?", uname, pswd)
if err != nil {
    log.Fatal(err)
}
fmt.Println("No of rows are :", rows)
defer rows.Close()

If you have another solution for login verification purpose then kindly suggest and explain it briefly Kindly help me out.

Answer 1

As i understand it you need to check if user and password exist in database. If so you can do:

var isAuthenticated bool
err := db.QueryRow("SELECT IF(COUNT(*),'true','false') FROM userLog WHERE u_name = ? AND u_pass = ?", uname, pswd).Scan(&isAuthenticated)
if err != nil {
    log.Fatal(err)
} 

If database contains supplied user and password isAuthenticated will be set to true.