# Pdo\Mysql::getWarningCount

(PHP 8 >= 8.4.0)

Pdo\Mysql::getWarningCount — Returns the number of warnings from the last executed query

### 说明

public Pdo\Mysql::getWarningCount(): int

Returns the number of warnings from the last executed query.

> 注意: For retrieving warning messages the following SQL command can be used: `SHOW WARNINGS [limit row_count]`.

### 参数

此函数没有参数。

### 返回值

Returns an int representing the number of warnings generated by the last query.

### 示例

示例 #1 Pdo\Mysql::getWarningCount() example

`<?php
$conn = PDO::connect("mysql:host=localhost;dbname=test;charset=utf8mb4", 'user', 'password');
$conn->query('SELECT 42/0');
if ($conn->getWarningCount() > 0) {
$result = $conn->query("SHOW WARNINGS");
$row = $result->fetch();
printf("%s (%d): %s\n", $row[0], $row[1], $row[2]);
}
?>`

以上示例会输出：

    Warning (1365): Division by 0

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