Php/docs/mysqli-stmt.affected-rows
mysqli_stmt::$affected_rows
mysqli_stmt_affected_rows
(PHP 5, PHP 7)
mysqli_stmt::$affected_rows -- mysqli_stmt_affected_rows — Returns the total number of rows changed, deleted, or inserted by the last executed statement
说明
面向对象风格
int $mysqli_stmt->affected_rows;
过程化风格
mysqli_stmt_affected_rows
( mysqli_stmt $stmt
) : int
Returns the number of rows affected by INSERT,
UPDATE, or DELETE query.
This function only works with queries which update a table. In order to get the number of rows from a SELECT query, use mysqli_stmt_num_rows() instead.
返回值
An integer greater than zero indicates the number of rows affected or retrieved. Zero indicates that no records where updated for an UPDATE/DELETE statement, no rows matched the WHERE clause in the query or that no query has yet been executed. -1 indicates that the query has returned an error. NULL indicates an invalid argument was supplied to the function.
Note:
If the number of affected rows is greater than maximal PHP int value, the number of affected rows will be returned as a string value.
范例
Example #1 面向对象风格
<?php$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 过程化风格
<?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);?>
以上例程会输出：
rows inserted: 17
参见
- mysqli_stmt_num_rows() - Return the number of rows in statements result set
- mysqli_prepare() - 准备执行一个 SQL 语句
