Php/func mysqli warning count
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PHP mysqli warning_count()函数
示例-面向对象的样式
返回上一个查询的警告数:
<?php $mysqli = new mysqli("localhost","my_user","my_password","my_db"); // Check connection if ($mysqli -> connect_errno) { echo "Failed to connect to MySQL: " . $mysqli -> connect_error; exit(); } $mysqli -> query("CREATE TABLE myPersons LIKE Persons"); $sql = "INSERT INTO myPersons (FirstName) VALUES( 'Hdghfhjgjtjyjn.,,ljkghfjbmbngfgffdhfhjgjgkjhlkhlkjljljlkjkljlkjkljkljlkj')"; $mysqli -> query($sql); if ($mysqli -> warning_count) { if ($result = $mysqli -> query("SHOW WARNINGS")) { $row = $result -> fetch_row(); printf("%s (%d): %s\n", $row[0], $row[1], $row[2]); $result -> close(); } } $mysqli -> close(); ?>
在底部查看程序样式的示例。
定义和用法
warning_count / mysqli_warning_count()函数返回上一次查询的警告数量。
句法
面向对象的样式:
$mysqli -> warning_count
程序风格:
mysqli_warning_count(connection)
参数值
参数 | 描述 |
---|---|
connection | 需要。指定要使用的MySQL连接 |
技术细节
返回值: | 来自上一个查询的警告数。如果没有警告,则为0 |
PHP版本: | 5+ |
示例-程序风格
返回上一个查询的警告数:
<?php $con = mysqli_connect("localhost","my_user","my_password","my_db"); if (mysqli_connect_errno()) { echo "Failed to connect to MySQL: " . mysqli_connect_error(); exit(); } mysqli_query($con, "CREATE TABLE myPersons LIKE Persons"); $sql = "INSERT INTO myPersons (FirstName) VALUES( 'Hdghfhjgjtjyjn.,,ljkghfjbmbngfgffdhfhjgjgkjhlkhlkjljljlkjkljlkjkljkljlkj')"; mysqli_query($con, $sql); if (mysqli_warning_count($con)) { if ($result = mysqli_query($con, "SHOW WARNINGS")) { $row = mysql_fetch_row($result); printf("%s (%d): %s\n", $row[0], $row[1], $row[2]); mysqli_free_result($result); } } mysqli_close($con); ?>