Mysqli_affected_rows function row number return value in PHP

Mysqli_affected_rows function row number return value in PHP_PHP tutorial

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Release： 2016-07-13 17:06:30

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This article will introduce to you the row count return value of mysqli_affected_rows function in PHP. Friends who need to know more can refer to it.

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:
int mysqli_affected_rows (mysqli link)
oop format:
class mysqli {
int affected_rows
}
Take a look at the example:
Normal mode

The code is as follows

代码如下

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$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);
?>

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代码如下

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$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();
?>

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

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$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(); ?>