Analysis of row number return value of mysqli_affected_rows in PHP, mysqlinumrows_PHP tutorial

Analysis of row number return value of mysqli_affected_rows in PHP, mysqlinumrows

The example of this article analyzes the row count return value of mysqli_affected_rows in PHP. Share it with everyone for your reference. The specific analysis is as follows:

The number of rows affected by the update operation in mysqli can be returned in two forms:

1. Return the number of matching lines
2. Return the number of affected rows

By default, the value returned by mysqli_affected_rows is the number of affected rows. If we need to return the number of matching rows, we can use the mysqli_real_connect function to initialize the database connection and add:

to the flag parameter of the function.

MYSQLI_CLIENT_FOUND_ROWS return number of matched rows, not the number of affected rows

Normal format:

Copy code The code is as follows:

int mysqli_affected_rows ( mysqli link )

oop format:

Copy code The code is as follows:

class mysqli {
int affected_rows
}

Take a look at the example:

Normal mode, the code is as follows:

Copy code The code is as follows:

$link = mysqli_connect("localhost", "my_user", "my_password", "world");

if (!$link) {
printf("Can't connect to localhost. Error: %sn", mysqli_connect_error());
exit();
}

/* Insert rows */
mysqli_query($link, "CREATE TABLE Language SELECT * from CountryLanguage");
printf("Affected rows (INSERT): %dn", mysqli_affected_rows($link));

mysqli_query($link, "ALTER TABLE Language ADD Status int default 0″);

/* update rows */
mysqli_query($link, "UPDATE Language SET Status=1 WHERE Percentage > 50″);
printf("Affected rows (UPDATE): %dn", mysqli_affected_rows($link));

/* delete rows */
mysqli_query($link, "DELETE FROM Language WHERE Percentage < 50″);
printf("Affected rows (DELETE): %dn", mysqli_affected_rows($link));

/* select all rows */
$result = mysqli_query($link, "SELECT CountryCode FROM Language");
printf("Affected rows (SELECT): %dn", mysqli_affected_rows($link));

mysqli_free_result($result);

/* Delete table Language */
mysqli_query($link, "DROP TABLE Language");

/* close connection */
mysqli_close($link);
?>

oop mode, the code is as follows:

Copy code The code is as follows:

$mysqli = new mysqli("localhost", "my_user", "my_password", "world");

/* check connection */
if (mysqli_connect_errno()) {
printf("Connect failed: %sn", mysqli_connect_error());
exit();
}

/* Insert rows */
$mysqli->query("CREATE TABLE Language SELECT * from CountryLanguage");
printf("Affected rows (INSERT): %dn", $mysqli->affected_rows);

$mysqli->query("ALTER TABLE Language ADD Status int default 0");

/* update rows */
$mysqli->query("UPDATE Language SET Status=1 WHERE Percentage > 50″);
printf("Affected rows (UPDATE): %dn", $mysqli->affected_rows);

/* delete rows */
$mysqli->query("DELETE FROM Language WHERE Percentage < 50″);
printf("Affected rows (DELETE): %dn", $mysqli->affected_rows);

/* select all rows */
$result = $mysqli->query("SELECT CountryCode FROM Language");
printf("Affected rows (SELECT): %dn", $mysqli->affected_rows);

$result->close();

/* Delete table Language */
$mysqli->query("DROP TABLE Language");

/* close connection */
$mysqli->close();
?>

I hope this article will be helpful to everyone’s PHP programming design.

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