bulk更新mongodb的脚本

bulk批处理mongodb，比普通的js脚本来的更快一些。

官方网址：https://docs.mongodb.com/manual/reference/method/Bulk/

bulk支持的方法：

Name	Description
Bulk.insert()	Adds an insert operation to a list of operations.
Bulk.find()	Specifies the query condition for an update or a remove operation.
Bulk.find.removeOne()	Adds a single document remove operation to a list of operations.
Bulk.find.remove()	Adds a multiple document remove operation to a list of operations.
Bulk.find.replaceOne()	Adds a single document replacement operation to a list of operations.
Bulk.find.updateOne()	Adds a single document update operation to a list of operations.
Bulk.find.update()	Adds a multi update operation to a list of operations.
Bulk.find.upsert()	Specifies upsert: true for an update operation.
Bulk.execute()	Executes a list of operations in bulk.
Bulk.getOperations()	Returns an array of write operations executed in the Bulk() operations object.
Bulk.tojson()	Returns a JSON document that contains the number of operations and batches in the Bulk() operations object.
Bulk.toString()	Returns the Bulk.tojson() results as a string.

bulk插入示例：

var bulk = db.items.initializeUnorderedBulkOp();
bulk.insert( { item: "abc123", defaultQty: 100, status: "A", points: 100 } );
bulk.insert( { item: "ijk123", defaultQty: 200, status: "A", points: 200 } );
bulk.insert( { item: "mop123", defaultQty: 0, status: "P", points: 0 } );
bulk.execute();

bulk更新示例：

/**
 * 批量更新数据库对象
 * 1. 按条件批量更新
 * 2. 无条件批量更新
 */

/** 1. 按条件批量更新 **/
// step 1: get key-value
var idArray = [];
var valueArray = [];
var idx = -1;
db.conch_ChargeSchedule.find({'predictChargeValue':{$exists:false}}).forEach(function(obj){
    idx++;
    idArray[idx]=obj._id;
    valueArray[idx]=obj.planValue;
});
// step 2: update
var bulk = db.conch_ChargeSchedule.initializeUnorderedBulkOp();
for(var i=0; i<idArray.length; i++){
    bulk.find( { _id: idArray[i] } ).update({ $set: { predictChargeValue: valueArray[i] } });
}
bulk.execute();

/** 2. 无条件批量更新 **/
var bulk = db.conch_ChargeSchedule.initializeUnorderedBulkOp();
bulk.find({}).update({ $set: { isPlanValueUpdatable: true, isStatusUpdatable:true, isStartDateUpdatable:true } });
bulk.execute();

var bulk = db.items.initializeUnorderedBulkOp();
bulk.find( { status: "D" } ).updateOne( { $set: { status: "I", points: "0" } } );
bulk.execute();

打印字符串：

var bulk = db.items.initializeOrderedBulkOp();
bulk.insert( { item: "abc123", status: "A", defaultQty: 500, points: 5 } );
bulk.insert( { item: "ijk123", status: "A", defaultQty: 100, points: 10 } );
bulk.find( { status: "D" } ).removeOne();
bulk.toString();

移除：

var bulk = db.items.initializeUnorderedBulkOp();
bulk.find( { status: "D" } ).remove();
bulk.execute();

替换：

var bulk = db.items.initializeUnorderedBulkOp();
bulk.find( { item: "abc123" } ).replaceOne( { item: "abc123", status: "P", points: 100 } );
bulk.execute();

插入并更新：

var bulk = db.items.initializeUnorderedBulkOp();
bulk.find( { status: "P", item: null } ).upsert().updateOne(
   {
     $setOnInsert: { defaultQty: 0, inStock: true },
     $currentDate: { lastModified: true },
     $set: { points: "0" }
   }
);
bulk.execute();

获得历史：

var bulk = db.items.initializeUnorderedBulkOp();

for (var i = 1; i <= 1500; i++) {
    bulk.insert( { x: i } );
}

bulk.execute();
bulk.getOperations();// 获得操作历史

普通的js脚本更新mongodb库，为单线程阻塞方式，有数据大小限制，数据大了容易断掉。bulk的则不会出现这种状况，效率max