Selecting a row where date=NOW()? - php

Question

I am trying to create a table that logs steps depending on date and the user id. But when I run my code, it happens that I get duplicate rows if a user logs their steps several times a day. I can't have a date with a unique key because that would cause all other users unable to log steps if a any other user has logged steps the same day. So my point is that I want to remove the option of having duplicate rows where user id and date is identical. I have two tables
Table a and table b, and I will refer to them as something.a and something.b
I have a problem with returning a valid row when using $entry = "SELECT * FROM table.a WHERE userid.a = '$user_id.b' AND date=NOW()"
I want to use it as a conditional to decide to either UPDATE or INSERT INTO table.a. I have user_id.b from an previous query which works as it is, so I will leave that as it is for now.
Here is how I query the database:
$entry_result = mysqli_query($conn, $entry);
Which is used here:
if (mysqli_num_rows($entry_result) > 0){
$conn->query("UPDATE steplogger SET steps='$steps' WHERE userid='$user_id' AND date=NOW()");
} else {
$conn->query("UPDATE users SET totalsteps = totalsteps + ('$steps') WHERE username = '$user'");
$conn->query("INSERT INTO steplogger (steps, userid, date) VALUES ('$steps', '$user_id', NOW())");
}
Any thoughts on what I am doing wrong?
PS. When I echo $entry_result I get a mysqli object.

Answer 1

As you said :
I want to remove the option of having duplicate rows where user id and date
The best way is to create an UNIQUE index on user_id and date, this way you won't be able to insert two rows with same user_id and date.
With an UNIQUE index, you can use INSERT...ON DUPLICATE KEY UPDATE that will do what you want : you will insert a new row (new user_id + date) and if a row already exists with the same user_id and date, you will update the row.
Here is the documentation : https://dev.mysql.com/doc/refman/8.0/en/insert-on-duplicate.html

Answer 2

You can try like this
if (mysqli_num_rows($entry_result) > 0){
$conn->query("UPDATE steplogger SET steps='$steps' WHERE userid='$user_id' AND date=".NOW().")";
} else {
$conn->query("UPDATE users SET totalsteps = totalsteps + ('$steps') WHERE username = '$user'");
$conn->query("INSERT INTO steplogger (steps, userid, date) VALUES ('$steps', '$user_id', ".NOW()."))";
}
To get current date in NOW() function, you can use this function.
And also format of the two conditions should be same.