Question

我的作业有问题，例如有一个类别数组$ cat = array（'1'，'4'，'5'，'7'）;现在我需要根据

类别从db中选择产品

SELECT * FROM products WHERE catid='1'
SELECT * FROM products WHERE catid='4'
SELECT * FROM products WHERE catid='5'
SELECT * FROM products WHERE catid='7'

是否可以在单个查询中执行此操作？因为四个查询的最终结果将合并。

Answer 1

SELECT * FROM products WHERE catid IN ('1', '2', '3', '4')

Answer 2

// array of $ids that you need to select
$ids = array('1', '2', '3', '4', '5', '6', '7', '8');

// create sql part for IN condition by imploding comma after each id
$in = '(' . implode(',', $ids) .')';

// create sql
$SQL = 'SELECT * FROM products WHERE catid IN ' . $in;

// see what you get
var_dump($sql);

Answer 3

$SQL_Part="("
$i=0;
while ($i<length($cat)-1)
{
   $SQL_Part+=$cat[i]+",";
}
$SQL_Part=$SQL_Part+$cat[$i+1]+")"

$SQL="SELECT * FROM products WHERE catid IN "+$SQL_Part;

它更通用，适合任何阵列!!

SQL选择数组中的所有内容

3 个答案: