Question

我的意图是检索包含Json对象数组中相关页面的页面部分列表。

例如：

[
    {
        "sectionid": "value1",
        "sectiondescription": "value1",
        "pages": [
            {
                "pageid": "id1",
                "pagedescription": "desription1",
            },
            {
                "pageid": "id2",
                "pagedescription": "desription2",
            }
        ]
    },
    {
        "sectionid": "value2",
        "sectiondescription": "value2",
        "pages": [
            {
                "pageid": "id3",
                "pagedescription": "desription3",
            },
            {
                "pageid": "id4",
                "pagedescription": "desription4",
            }
        ]
    }
]

我在Mysql中使用Nodejs。

我使用下面的mysql查询来检索为给定用户角色启用的部分：

SELECT section.SectionId,section.Description
FROM section as section
INNER JOIN userroletosection AS urts
    ON section.SectionId = urts.SectionID
INNER JOIN user AS user
    ON user.RoleID = urts.UserRoleID
WHERE
    user.UserId = 1

此查询将检索给定部分的页面：

SELECT p.PageID,p.Description,p.URL
FROM page AS p
INNER JOIN sectiontopage AS stp
    ON p.PageID = stp.PageID
WHERE
    stp.SectionID = ?

我需要知道如何使用循环运行查询以及如何使用nodejs和mysql构造Json数组对象。

我在这里附加了nodejs代码

conn.query（'SELECT *从作为节的部分INNER JOIN userroletosection AS urts ON section.SectionId = urts.SectionID INNER JOIN用户作为user ON user.RoleID = urts.UserRoleID WHERE user.UserId = 1'，（err ，rows，fileds）=> {

if(!err)
{

  for (var i = 0;i < rows.length; i++) {

    conn.query('SELECT p.PageID,p.Description,p.URL FROM page AS p INNER JOIN sectiontopage AS stp ON p.PageID = stp.PageID    WHERE stp.SectionID = ?',[rows[i].SectionId],(err2,rows2,fileds)=>{
      if(!err2)
     {

      for(var j =0; j<rows2.length;j++)
      {
        obj2.push({ PID: JSON.stringify(rows2[j].PageID),
          PageID: rows2[j].PageID,
          PageDescription: rows2[j].Description,
          PageUrl: rows2[j].URL
        })


      }


        console.log(obj2);

    }
    })
    {
       objs.push({ID: JSON.stringify(rows[i].SectionId),
          ID: rows[i].SectionId,
          sectionDesciption: rows[i].Description,
          Pages: obj2
        });
    }


  }

Answer 1

您将必须使用MySQL JSON函数才能访问JSON文档中的项目，例如JSON_EXTRACT和JSON_CONTAINS

使用Mysql和Nodejs的嵌套JSON对象

1 个答案: