动态参数JSON到PHP中的WHERE

我有一个JSON响应请求，希望生成一个变量$Where，这是JSON模式：

"filter":
{"filters":[
    {"logic":"and","filters":[
        {"field":"NAMA","operator":"eq","value":"Rahmat"},
        {"field":"NAMA","operator":"eq","value":"Rosadi"}
    ]},{"logic":"or","filters":[
        {"field":"NIPK","operator":"eq","value":"1919191919"},
        {"field":"NIPK","operator":"eq","value":"818181818181"}
    ]},{"logic":"and","filters":[
        {"field":"JK","operator":"eq","value":"P"},
        {"field":"JK","operator":"eq","value":"L"}
    ]}
],
"logic":"and"}

有谁能告诉我如何使这一模式成为单列PHP变量，如下所示：

$Where = "(NAMA = 'Rahmat' or NAMA = 'Rosadi') and (NIPK = '1919191919' or NIPK != '818181818181') and (JK='P' AND JK='L')"

---

对不起，我的英语不好。

您可以将

过滤器

列表枚举到PHP数组中，将每个过滤器构建为SQL或值列表，然后使用

内爆（'OR'，…）

将它们连接起来；并进一步内爆'and'子句列表中的数组

但是，这种方法失去了JSON设置所允许的灵活性；它可以扩展为

或
子句或单个子句的
和
-列表，也可以使用
语法中的
合并同一字段的
或
子句，但仅此而已

您可以使用从RPN表示法转换为代数的算法来寻找更强大（尽管更复杂）的方法

简单的版本是

$ops = array(
    'eq' => '=',
    'ne' => '!=',
    'gt' => '>',
    'lt' => '<',
    'ge' => '>=',
    'le' => '<=',
    // CHECK THIS OUT, FIX & COMPLETE
);

$arr_Filters = array();
foreach($filters as $filter)
{
    /* $filter is a set of subfilters:
       {"logic":"and","filters":[
          {"field":"NAMA","operator":"eq","value":"Rahmat"},
         {"field":"NAMA","operator":"eq","value":"Rosadi"}
       ]},
       which we see as:
    */
    $logic = $filter['logic'];
    $arr_Filter  = array();
    foreach($filter['filters'] as $fov)
    {
        $op_f = $fov['operator'];
        $op   = $ops[$op_f];
        $value = /* FUNCTION TO SQL ESCAPE A VALUE */ $fov['value'];
        $value = is_numeric($value) ? $value : "'".$value."'";
        $arr_Filter[] = "$fov[field] $op $value";
    }
    $arr_Filters[] = '('.implode(' ' . $filter['logic'] . ' ', $arr_Filter).')';
}
$sql_filter = 'WHERE ' . implode(' AND ', $arr_Filters);

在
foreach（$filter['filters']as$fov）为foreach（）提供的参数无效。
首先，这是无效的JSON。您可以使用验证JSON，然后尝试如果无法使其工作，请通过编辑将您尝试运行的代码添加到此问题。当我们看到你自己也付出了汗水时，帮助别人就容易多了，也令人愉快多了。
// ($ops omitted, same as above)

$arr_Filters = array();
foreach($filters->filter->filters as $filter)
{
    /* $filter is a set of subfilters:
       {"logic":"and","filters":[
          {"field":"NAMA","operator":"eq","value":"Rahmat"},
         {"field":"NAMA","operator":"eq","value":"Rosadi"}
       ]},
       which we see as:
    */
    $logic = $filter->logic;
    $arr_Filter  = array();
    foreach($filter->filters as $fov)
    {
        $op_f = $fov->operator;
        $op   = $ops[$op_f];
        $value = /* FUNCTION TO SQL ESCAPE A VALUE */ $fov->value;
        $value = is_numeric($value) ? $value : "'".$value."'";
        $arr_Filter[] = "{$fov->field} $op $value";
    }
    $arr_Filters[] = '('.implode(' ' . $filter->logic . ' ', $arr_Filter).')';
}
$sql_filter = 'WHERE ' . implode(' ' . $filters->filter->logic . ' ', $arr_Filters);