$mysqli->query

$mysqli->affected_rows

$mysqli->insert_id

<?php
$mysqli = @new mysqli('localhost', 'root', '', 'test');
if ($mysqli->connect_errno) {
    die('CONNECT ERROR: ' . $mysqli->connect_error);
}
$mysqli->set_charset('utf8');

$sql = "INSERT user(username,password) VALUES('king','king'),('queen','queen');";
$res = $mysqli->query($sql);
if ($res) {
    echo "恭喜您注册成功，您是网站第" . $mysqli->insert_id . '位用户<br/>';
    echo "有" . $mysqli->affected_rows . "记录被影响<br/>";
} else {
    echo 'ERROR  ' . $mysqli->errno . ":" . $mysqli->error;
}

?>

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<?php
$mysqli = @new mysqli('localhost', 'root', '', 'test');
if ($mysqli->connect_errno) {
    die('CONNECT ERROR: ' . $mysqli->connect_error);
}
$mysqli->set_charset('utf8');
$sql = "UPDATE user SET age=age+10";
$res = $mysqli->query($sql);
if ($res) {
    echo $mysqli->affected_rows . "条记录被更新";
} else {
    echo "ERROR" . $mysqli->errno . ":" . $mysqli->error;
}

?>

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affect_rows值为3种
1.受影响的记录条数
2.-1，代表SAL语句有问题
3.0 代表没有受影响记录的条数

<?php
$mysqli = @new mysqli('localhost', 'root', '', 'test');
if ($mysqli->connect_errno) {
    die('CONNECT ERROR: ' . $mysqli->connect_error);
}
$mysqli->set_charset('utf8');
$sql = "DELETE FROM user WHERE id>=6";
$res = $mysqli->query($sql);
if ($res) {
    echo $mysqli->affected_rows . "条记录被删除<br/>";
} else {
    echo "ERROR  " . $mysqli->errno . ":" . $mysqli->error;
}
//关闭到MYSQL的a连接
$mysqli->close();
?>

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