Question

如何以最短的方式循环：

$db->setQuery("SELECT val1 FROM table1 WHERE val2 = 'AAA'");
$row1 = $db->loadObjectList();
$var1 = $row1[0];

$db->setQuery("SELECT val3 FROM table1 WHERE val2 = 'AAA'");
$row2 = $db->loadObjectList();
$var2 = $row2[0];

$db->setQuery("SELECT val1 FROM table1 WHERE val2 = 'BBB'");
$row3 = $db->loadObjectList();
$var3 = $row3[0];

$db->setQuery("SELECT val3 FROM table1 WHERE val2 = 'BBB'");
$row4 = $db->loadObjectList();
$var4 = $row4[0];

...

$db->setQuery("SELECT val1 FROM table1 WHERE val2 = 'AAA'");
$row997 = $db->loadObjectList();
$var997 = $row997[0];

$db->setQuery("SELECT val3 FROM table1 WHERE val2 = 'AAA'");
$row998 = $db->loadObjectList();
$var998 = $row998[0];

$db->setQuery("SELECT val1 FROM table1 WHERE val2 = 'BBB'");
$row999 = $db->loadObjectList();
$var999 = $row999[0];

$db->setQuery("SELECT val3 FROM table1 WHERE val2 = 'BBB'");
$row1000 = $db->loadObjectList();
$var1000 = $row1000[0];

我有1000个这样的查询，我不得不绕过它们。

另外，我是否需要逐个声明所有全局变量，即$ var1，$ var2，... var1000，还是可以循环？

Answer 1

创建查询数组并像这样迭代

$var = array(); // storing result in this array
$array_qry = array("SELECT val1 FROM table1 WHERE val2 = 'AAA'","SELECT val3 FROM table1 WHERE val2 = 'AAA'");// array of query
foreach($array_qry as $qry) {
    $db->setQuery($qry);
    $row = $db->loadObjectList();
    $var[] = $row[0];
}

然后迭代$var以获取存储值

Answer 2

$resultArray = array();
$queryParam = array('AAA', 'BBB', 'CCC');  // Add Query param value
$fieldArray = array('val1', 'val3','val4')  // Add field attributes
foreach($queryParam as $qryPrm) {
    foreach($fieldArray as $field) {
        $sql= "select ". $field . " from mytable where val2 = '".$qryPrm."'";
        $db->setQuery($qry);
        $row = $db->loadObjectList();
        $resultArray[] = $row[0];
    }
}

这对你有用吗？

将PHP中的1000个SQL SELECT查询简化为循环

2 个答案: