Question

我有一个类似于

的集合

{ 
"_id" : ObjectId("57832cb74114065710110971"), 
"strName" : "Some Book In Library", 
"strUPN" : "123456", 
"bHardCover": "yes",
"bIsDamaged" : "yes", 
"arrWhoHasRead" : [
    {
        "nUserID" : ObjectId("577b0b8d41140640f94894a1"), 
        "strPersonName" : "John Doe", 
        "strRole" : "Author"
    },
{
        "nUserID" : ObjectId("xyz"), 
        "strPersonName" : "Jane Doe", 
        "strRole" : "Customer"
    }
]
}

我想返回所有bIsDamaged = yes和bHardCover = yes的记录 AND where（arrWhoHasRead.nUserID = 577b0b8d41140640f94894a1 AND arrWhoHasRead.strRole =＆＃34; Author＆＃34;）

我尝试将多个AND条件（在paranthesis中的那个）嵌套在一个数组中，但这似乎没什么帮助。也许我需要投影？

我在PHP中使用它

Answer 1

如果您想显示符合您要求的所有记录，包括arrWhoHasRead的所有其他元素，则find就足够了：

db.device.find({"bHardCover": "yes","bIsDamaged" : "yes","arrWhoHasRead.nUserID":ObjectId("577b0b8d41140640f94894a1"),"arrWhoHasRead.strRole":"Author"});

会给你：

{
    "_id": ObjectId("578d7f9aca19a63da3984899"),
    "strName": "Some Book In Library",
    "strUPN": "123456",
    "bHardCover": "yes",
    "bIsDamaged": "yes",
    "arrWhoHasRead": [{
        "nUserID": ObjectId("577b0b8d41140640f94894a1"),
        "strPersonName": "John Doe",
        "strRole": "Author"
    }, {
        "nUserID": ObjectId("578d7d6bca19a63da3984897"),
        "strPersonName": "Jane Doe",
        "strRole": "Customer"
    }]
} {
    "_id": ObjectId("578d7fb0ca19a63da398489a"),
    "strName": "Some Book In Library",
    "strUPN": "123456",
    "bHardCover": "yes",
    "bIsDamaged": "yes",
    "arrWhoHasRead": [{
        "nUserID": ObjectId("577b0b8d41140640f94894a1"),
        "strPersonName": "John Doe",
        "strRole": "Author"
    }, {
        "nUserID": ObjectId("578d7d6bca19a63da3984898"),
        "strPersonName": "Jane Doe",
        "strRole": "Customer"
    }]
}

如果您希望结果只包含arrWhoHasRead匹配ObjectId("577b0b8d41140640f94894a1")的元素，您可以执行aggregate但不需要投影，除非您想要排除其他字段：< / p>

db.device.aggregate([{
    "$unwind": "$arrWhoHasRead"
}, {
    $match: {
        "bHardCover": "yes",
        "bIsDamaged": "yes",
        "arrWhoHasRead.nUserID": ObjectId("577b0b8d41140640f94894a1"),
        "arrWhoHasRead.strRole": "Author"
    }
}])

将给出：

{
    "_id": ObjectId("578d7f9aca19a63da3984899"),
    "strName": "Some Book In Library",
    "strUPN": "123456",
    "bHardCover": "yes",
    "bIsDamaged": "yes",
    "arrWhoHasRead": {
        "nUserID": ObjectId("577b0b8d41140640f94894a1"),
        "strPersonName": "John Doe",
        "strRole": "Author"
    }
} {
    "_id": ObjectId("578d7fb0ca19a63da398489a"),
    "strName": "Some Book In Library",
    "strUPN": "123456",
    "bHardCover": "yes",
    "bIsDamaged": "yes",
    "arrWhoHasRead": {
        "nUserID": ObjectId("577b0b8d41140640f94894a1"),
        "strPersonName": "John Doe",
        "strRole": "Author"
    }
}

请注意，数组已经展开，因此arrWhoHasRead＆amp;中只有json对象。与ObjectId("577b0b8d41140640f94894a1")

中的arrWhoHasRead一样多的记录

mongo查找子文档匹配多个条件的文档

1 个答案: