PHP where語句
PHP MySQL Where 子句
WHERE 子句用於篩選記錄。
WHERE 子句
WHERE 子句用於擷取符合指定標準的記錄。
語法
SELECT column_name(s) FROM table_name
WHERE column_name operator value
#如需選取符合指定條件的數據，請在SELECT 語句中新增WHERE 子句。
下面的運算子可與WHERE 子句一起使用：
為了讓PHP 執行上面的語句，我們必須使用mysqli_query()函數。此函數用於向 MySQL 連線發送查詢或命令。
實例
下面的實例將從"Persons" 表中選取所有FirstName='Peter' 的行：
<?php
$con=mysqli_connect("localhost","username","password","database");
// 检测连接
if (mysqli_connect_errno())
{
echo "连接失败: " . mysqli_connect_error();
}
$result = mysqli_query($con,"SELECT * FROM Persons
WHERE FirstName='Peter'");
while($row = mysqli_fetch_array($result))
{
echo $row['FirstName'] . " " . $row['LastName'];
echo "<br>";
}
?>以上程式碼將輸出：
#Peter Griffin
<?php
$con=mysqli_connect("localhost","username","password","database");
// 检测连接
if (mysqli_connect_errno())
{
echo "连接失败: " . mysqli_connect_error();
}
$result = mysqli_query($con,"SELECT * FROM Persons
WHERE FirstName='Peter'");
while($row = mysqli_fetch_array($result))
{
echo $row['FirstName'] . " " . $row['LastName'];
echo "<br>";
}
?>
