如何创建自动增量字段 [英] How to create auto increment field

问题描述

我想使用php在mongodb中的一个字段中添加自动增量值，而不使用计数记录，下一个数字(count + 1)将是我的增量值... 或者是否有任何方法可以在mongodb，php中创建自动增量值的数组，例如，一个客户有多个电子邮件和地址，那么我们可以像email[{1:'[e-mail]',2:'[e-mail]'},...]一样存储它，对于address[{1:'Indore',2:'Dewas'},...]也一样，所以为了唯一性，我想从每个电子邮件和地址设置自动增量值.

I want to add auto increment value in a field in mongodb using php, without using counting the records and next number(count + 1) will be my increment value... Or Is there any way to create array of autoincrement values in mongodb,php for example A customer having multiple emails and addresses then we can store it like email[{1:'[e-mail]',2:'[e-mail]'},...] and also same for address[{1:'Indore',2:'Dewas'},...] So for uniqueness I want to set autoincrement value from each email and address..

推荐答案

如果创建两个收藏

首先存储要为其创建自动递增编号的字段，例如

First to store the field for whichyou want to create autoincrement number like

// Inserting 2 records for which we want to create auto-increment numbers
db.autoincrementcollection.insert({
   field_id: "register_id",
   nextId: 0
},
{
   field_id: "user_id",
   nextId: 0
});

// Function is used to get the next autoincremented value
function getNextId(field)
{
   var ret = db.autoincrementcollection.findAndModify({
        query: { field_id: field },
        update: { $inc: { nextId: 1 } },
        new: true
   });    
   return ret.nextId;
}

第二，您要在其中使用递增的数字，例如

Second in which you want to use the incremented number like

// inserting data in registration collection with register_id auto-increment number
db.registration.insert({
     _id: getNextId("register_id"),
     fname: "Rohan",
     lname:"Kumar"
});
// inserting data in user collection with user_id auto-increment number
db.users.insert({
     _id: getNextId("user_id"),
     name: "Rohan Kumar"
});

findAndModify()可能无法在使用 PHP 的代码中工作，然后可以使用

findAndModify() may not work while code using PHP then you can use find() and/or update()

有关创建的文档 -自动递增字段

Refer Docs for create-an-auto-incrementing-field

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