Question

数据库（书表）
serialID价格
0001 10.00
0001 30.00
技术15.00
0004（A）9.00
0004（B）5.00
0005 3.00
（注：0003无记录）

代码

$serialID = array("0001","0002","0003","0004","0005");

//DB Connection
for($i = 0; $i < count($serialID); $i++)
{
    $q = "select * from book where serial like \"$serialID[$i]%\" limit 1";
    $r = mysqli_query($dbc,$q);

    while($row = mysqli_fetch_array($r, MYSQLI_ASSOC))
    {
          $serial[$i] = $row['serial'];
          $price[$i] = $row['price'];
          echo $serial[$i].' '.$price[$i];
    }
}

//pass db value into array
for($j = 0; $j < count($serialID); $j++)
{
     $data[$j] = array($serialID[$j],$price[$j]); 
}

这次我的问题是如何跳过serialID 0003 值？
我的预期输出：（echo $ serial [$ i]。''。$ price [$ i]）
0001 10.00
技术15.00
0003
0004（A）9.00
0005 3.00

Answer 1

只需在for循环中检查它。使用以下代码

   $serialID = array("0001","0002","0003","0004","0005");

//DB Connection
for($i = 0; $i < count($serialID); $i++)
{
    $q = "select * from book where serial like \"$serialID[$i]%\" limit 1";
    $r = mysqli_query($dbc,$q);

    while($row = mysqli_fetch_array($r, MYSQLI_ASSOC))
    {
          $serial[$i] = $row['serial'];
if($serialID=="0003"){
          $price[$i] = $row['price'];
    }
          echo $serial[$i].' '.$price[$i];
    }
}

//pass db value into array
for($j = 0; $j < count($serialID); $j++)
{
     $data[$j] = array($serialID[$j],$price[$j]); 
}

希望这有助于你

Answer 2

将上一个循环修改为

for($j = 0; $j < count($serialID); $j++)
{
if(null != $price[$j]){
     $data[$j] = array($serialID[$j],$price[$j]); 
    }
}

但我的问题是，在循环中查询某些内容并不是自杀？也许你应该使用“IN”声明？还是“或”？例如：

foreach($serialId as $id){
  $string.= ' %'.$serialId. ' % OR '; //of course you should check if this is first or last cell in array. So you don’t add unnecessary OR or space
}
select * from book where serial like \"$string\" limit 1

Answer 3

我认为此代码可以更好地满足您的需求：

$serialID = array("0001", "0002", "0003", "0004", "0005");

//DB Connection
foreach ($serialID as $serialItem) {
    $q = "select * from book where serial like \"$serialItem%\" limit 1";
    $r = mysqli_query($dbc, $q);

    while ($row = mysqli_fetch_array($r, MYSQLI_ASSOC)) {
        if (count($row) > 0) {
            echo $row['serial'] . ' ' . $row['price'];

            //pass db value into array
            $data[] = array(
                'serial' => $row['serial'],
                'price'  => $row['price']
            );
        }
    }
}

// debug output
print_r($data);

Answer 4

$serialID = array("0001","0002","0003", "0004","0005");

$preparing = [];
foreach($serialID as $value) {
 $preparing[] = "'" . $value . "'";
}

$sql = "select * from book where serial IN (" . implode(',', $preparing) . ")";
$query = mysqli_query($sql);

$data = mysqli_fetch_all($query, MYSQLI_ASSOC);

PHP数组mysql检索每条记录（第2部分）

4 个答案: