mysqli_stmt::$affected_rows
mysqli_stmt::$affected_rows
mysqli_stmt_affected_rows
(PHP 5, PHP 7)
mysqli_stmt :: $ affected_rows - mysqli_stmt_affected_rows - 返回上一次执行语句更改，删除或插入的总行数
描述
面向对象的风格
int $mysqli_stmt->affected_rows;
程序风格
int mysqli_stmt_affected_rows ( mysqli_stmt $stmt )
返回受INSERT，UPDATE或DELETE查询影响的行数。
此函数仅适用于更新表的查询。为了从SELECT查询中获取行数，请改用mysqli_stmt_num_rows（）。
参数
`stmt`
仅过程风格：由mysqli_stmt_init（）返回的语句标识符。
Return Values
大于零的整数表示受影响或检索的行数。零表示没有记录更新UPDATE / DELETE语句，没有行与查询中的WHERE子句匹配，或者没有查询尚未执行。-1表示查询返回了一个错误。NULL表示提供给函数的参数无效。
注意：如果受影响的行数大于最大PHP int值，受影响的行数将作为字符串值返回。
例子
Example #1 Object oriented style
<?php
$mysqli = new mysqli("localhost", "my_user", "my_password", "world"
/* check connection */
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error()
exit(
}
/* create temp table */
$mysqli->query("CREATE TEMPORARY TABLE myCountry LIKE Country"
$query = "INSERT INTO myCountry SELECT * FROM Country WHERE Code LIKE ?";
/* prepare statement */
if ($stmt = $mysqli->prepare($query)) {
/* Bind variable for placeholder */
$code = 'A%';
$stmt->bind_param("s", $code
/* execute statement */
$stmt->execute(
printf("rows inserted: %d\n", $stmt->affected_rows
/* close statement */
$stmt->close(
}
/* close connection */
$mysqli->close(
?>
Example #2 Procedural style
<?php
$link = mysqli_connect("localhost", "my_user", "my_password", "world"
/* check connection */
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error()
exit(
}
/* create temp table */
mysqli_query($link, "CREATE TEMPORARY TABLE myCountry LIKE Country"
$query = "INSERT INTO myCountry SELECT * FROM Country WHERE Code LIKE ?";
/* prepare statement */
if ($stmt = mysqli_prepare($link, $query)) {
/* Bind variable for placeholder */
$code = 'A%';
mysqli_stmt_bind_param($stmt, "s", $code
/* execute statement */
mysqli_stmt_execute($stmt
printf("rows inserted: %d\n", mysqli_stmt_affected_rows($stmt)
/* close statement */
mysqli_stmt_close($stmt
}
/* close connection */
mysqli_close($link
?>
上面的例子会输出：
rows inserted: 17
