MongoDB学习第六篇 --- Delete操作

数据如下：

db.inventory.insertMany( [
   { item: "journal", qty: 25, size: { h: 14, w: 21, uom: "cm" }, status: "A" },
   { item: "notebook", qty: 50, size: { h: 8.5, w: 11, uom: "in" }, status: "P" },
   { item: "paper", qty: 100, size: { h: 8.5, w: 11, uom: "in" }, status: "D" },
   { item: "planner", qty: 75, size: { h: 22.85, w: 30, uom: "cm" }, status: "D" },
   { item: "postcard", qty: 45, size: { h: 10, w: 15.25, uom: "cm" }, status: "A" },
]);

一、shell操作delete语句

db.inventory.deleteMany({})  # 删除所有 document
db.inventory.deleteMany({ status : "A" })    # 删除所有 匹配到document
db.inventory.deleteOne( { status: "D" } )   # 只删除第一个匹配的 document

二、python操作delete语句

db.inventory.delete_many({})
db.inventory.delete_many({"status": "A"})
db.inventory.delete_one({"status": "D"})

三、java操作delete语句

collection.deleteMany(new Document());
collection.deleteMany(eq("status", "A"));
collection.deleteOne(eq("status", "D"));