如何更新 mongo db 中具有给定值的指定字段
How to update a specified field having a given value in mongo db
这里我想更新给定的文档如下
{
"emailid": "xxx.gmail",
"user_devices": [],
"devices": [{
"created_time": 1607153351,
"token": 123
},
{
"created_time": 1807153371,
"token": 1345
}]
}
这里我需要用一个像“Newfield”:“newfield”这样的新字段更新带有 1345 令牌的现场设备,最终输出如下所示
{
"emailid": "xxx.gmail",
"user_devices": [],
"devices": [{
"created_time": 1607153351,
"token": 123
},
{
"created_time": 1807153371,
"token": 1345,
"Newfield":"newfield"
}]
}
如何像这样更新 mongo 数据库。预先感谢您的回答。
db.products.update({
"devices.token": 1345 //Matching condition
},
{
$set: {
"devices.$.t": 2 //Updates the matched element in the array
}
})
您可以使用 positional operator
- Reference
这里我想更新给定的文档如下
{
"emailid": "xxx.gmail",
"user_devices": [],
"devices": [{
"created_time": 1607153351,
"token": 123
},
{
"created_time": 1807153371,
"token": 1345
}]
}
这里我需要用一个像“Newfield”:“newfield”这样的新字段更新带有 1345 令牌的现场设备,最终输出如下所示
{
"emailid": "xxx.gmail",
"user_devices": [],
"devices": [{
"created_time": 1607153351,
"token": 123
},
{
"created_time": 1807153371,
"token": 1345,
"Newfield":"newfield"
}]
}
如何像这样更新 mongo 数据库。预先感谢您的回答。
db.products.update({
"devices.token": 1345 //Matching condition
},
{
$set: {
"devices.$.t": 2 //Updates the matched element in the array
}
})
您可以使用 positional operator
- Reference