Gets the number of affected rows in a previous MySQL operation

# mysqli::$affected_rows

# mysqli_affected_rows

(PHP 5, PHP 7, PHP 8)

mysqli::$affected_rows -- mysqli_affected_rows — Gets the number of affected rows in a previous MySQL operation

### 说明

面向对象风格

int|string $mysqli->affected_rows;

过程化风格

function mysqli_affected_rows(mysqli `$mysql`): int|string

Returns the number of rows affected by the last `INSERT`, `UPDATE`, `REPLACE` or `DELETE` query. Works like mysqli_num_rows() for `SELECT` statements.

### 参数

`mysql`
  仅以过程化样式：由 mysqli_connect() 或 mysqli_init() 返回的 mysqli 对象。

### 返回值

An integer greater than zero indicates the number of rows affected or retrieved. Zero indicates that no records were updated for an `UPDATE` statement, no rows matched the `WHERE` clause in the query or that no query has yet been executed. `-1` indicates that the query returned an error or that mysqli_affected_rows() was called for an unbuffered `SELECT` query.

> 注意:

> If the number of affected rows is greater than the maximum int value (`PHP_INT_MAX`), the number of affected rows will be returned as a string.

### 示例

示例 #1 $mysqli->affected_rows example

面向对象风格

    <?php

    mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
    $mysqli = new mysqli("localhost", "my_user", "my_password", "world");

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

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

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

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

过程化风格

    <?php

    mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
    $link = mysqli_connect("localhost", "my_user", "my_password", "world");

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

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

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

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

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

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

以上示例会输出：

    Affected rows (INSERT): 984
    Affected rows (UPDATE): 168
    Affected rows (DELETE): 815
    Affected rows (SELECT): 169

### 参见

- mysqli_num_rows() - Gets the number of rows in the result set
- mysqli_info() - 返回最近执行的 SQL 语句的信息

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