使用条件查询进行查询

时间:2012-12-03 16:49:56

标签: php mysql sql

假设我在一个处理查询的php文件中有很多连接和子查询的查询。 Nb:我在底部提供了$ query的示例

$query = query here;
if ($query) {
            return $query->result();
        } else {
            return false;
        }
}

然后在我处理html的php文件中,我有一些常用的foreach循环,其中包含一些需要进行其他查询的条件,例如; 注意:结果包含对象$ query-> result()。

foreach ($results as $item) {
        $some_array = array();
        $some_id = $item->id;
        if ($some_id != 0) {
            //id_return_other_id is a function that querys a db table and returns the specified column in the same table, it returns just one field
            $other_id = id_return_other_id($some_id);
            $some_query = another  query that requires some joins and a subquery;
            $some_array = the values that are returned from some_query in an array
            //here i'm converting obj post into an array so i can merge the data in $some_array to item(Which was converted into an array) then convert all of it back into an object
            $item = (object)array_merge($some_array, (array)$item);
        }

//do the usual dynamic html stuff here.
}

这很好用但是因为我不喜欢我在循环中做很多查询的方式,有没有办法在处理查询的文件中添加if $ some_id!= 0? 我试过了

$query = query here;
//declaring some array as empty when some_id is 0
$some_array = array();
if ($query) {
            if ($some_id != 0) {
            //same as i said before
            $other_id = $this->id_return_other_id($some_id);
            $some_query = some query;
            $some_array = array values gotten from some query;

        }
          $qresult = (object)array_merge($some_array, (array)$query->result);
          return $qresult;
        } else {
            return false;
        }
}

由于显而易见的原因,这不起作用,是否有任何想法?

此外,如果有一种方法可以在$ query中创建这些条件和查询,我会永远爱你。

Ps:演示查询类似于

    $sql = "SELECT  p.*,up.*,upi.someField,etc..
                    FROM    (
                             SELECT  (another subquery)
                             FROM    table1
                             WHERE   table1_id = 3
                             UNION ALL
                             SELECT  $user_id
                            ) uf
                    JOIN    table2 p
                    ON      p.id = uf.user_id
                    LEFT JOIN   table3 up
                    ON     .....
                    LEFT JOIN table4
                    ON     ....
                    LEFT JOIN table5
                    ON     ....
                    And so on..etc..
                    ORDER BY p.date DESC";
$query = mysql_query..

2 个答案:

答案 0 :(得分:2)

您似乎只需要在查询文件中运行两个查询。第一个查询将获得您正在寻找的广泛内容。第二个查询将查询结果中的id并执行新查询以获取有关该特定id的任何详细信息。我在我的应用程序的客户搜索页面中使用了类似的东西。

$output = array();

$query1 = $this->db->query("SELECT * FROM...WHERE id = ...");

foreach ($query->result_array() as $row1)
{
    $output[$row1['some_id']] = $row1;

    $query2 = $this->db->query("SELECT * FROM table WHERE id = {$row1['some_id']}");

    foreach ($query2->result_array() as $row2)
    {
        $output[$row1['some_id']]['data_details'][$row2['id']] = $row2;
    }
} 

然后在显示html的页面中,您只需要两个foreach:

foreach($queryresult as $key=> $field)
{
    echo $field['some_field'];

    foreach($child['data_details'] as $subkey => $subfield)
    {
        echo $subfield['some_subfield'];
    }
} 

我知道你正在使用对象,但你可能会将其转换为使用该格式。我希望这有意义/有帮助。

答案 1 :(得分:0)

使用此

 if ($some_id !== 0) {

而不是

 if ($some_id != 0) {