从数据库问题查询嵌套的关联数组

Question

嗨，我正在尝试查询一个关联数组，最终结果应类似于下面的json数组。 但是我希望数据节和id名称节为每个节点查询一次，而邻接节则要查询多次（如果一个节点有多个邻接关系），如果条件是，如何多次查询此嵌套数组的一部分？在保持这种结构的同时又满足了其余所有的需求，但是对于一个节点却没有多个或没有邻接关系？

   var json =[{
        "adjacencies": [{
           "nodeTo": "graphnode9",
           "nodeFrom": "graphnode5",
           "data": {}
        }],
        "data": {
            "$color": "#C74243",
            "$type": "triangle",
        },
        "id": "graphnode5",
        "name": "graphnode5"
  }];

这是我的数据库结构

nodes                 Relationships                      
-----                 -------------
id int(11),           id int(11),
name varchar(35),     to int(11), //this is the destination node from the id relation 
color varchar(7),     data varchar(0) null
type varchar (12),    Foreign key (id) references nodes(id)
Primary key (id)       

engine = innodb    

这是我尝试获得关联数组的尝试，但它同时查询所有内容并复制整个结构。

function getjson(){  
    $db = adodbConnect();
    $query = "SELECT nodes.*, relationships.* FROM nodes inner JOIN relationships ON nodes.id = relationships.id";
    $result = $db -> Execute($query);

    while($row=$result->FetchRow()) {
        $id = (float)$row['id'];
        $name = $row['name'];
        $color1 = $row['color'];
        $type1 = $row['type'];
        $to = (float)$row['to'];

        $array = array(
            "adjacencies:" => array(
                "nodeTo" => "$to",
                "nodeFrom" => "$id",
                "data" => array()
            ),
            "data" => array(
               "$"."color" => $color1,
               "$"."type" => $type1
            ),
            "id".":" => $id,
            "name".":" => $name
        );

    }
    print"$array";
    json_encode($array);
}

Answer 1

您需要在循环外创建数组并向其中添加项目

$array = array();
while($row=$result->FetchRow()) {
    $array[] = array(
        "adjacencies:" => array(
            "nodeTo" => (float)$row['to'],
            "nodeFrom" => (float)$row['id'],
            "data" => array()
        ),
        "data" => array(
           '$color' => $row['color'],
           '$type' => $row['type']
        ),
        "id" => (float)$row['id'],
        "name" => $row['name']
    );

}