PHP mysqli warning_count() 函数

定义和用法

warning_count / mysqli_warning_count() 函数返回上次查询的警告数量。

实例

例子 1 - 面向对象风格

返回上次查询的警告数量：

<?php
$mysqli = new mysqli("localhost","my_user","my_password","my_db");

// 检查连接
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(
'Hdghfhjgjtjyjnjkghfjbmbngfgffdhfhjgjgkjhlkhlkjljljlkjkljlkjkljkljlkj')";

$mysqli -> query($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();
?>

例子 2 - 过程式风格

返回上次查询的警告数量：

<?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.,,��l�jkghfjbmbngfgffdhfhjgjgkjhlkhlkjljljlkjkljlkjkljkljlkj')";

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);
?>

语法

面向对象风格：

$mysqli -> warning_count

过程式风格：

mysqli_warning_count(connection)

技术细节