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Mongoose-增加和查询

本文的内容是基于 Mongoose 开篇继续延续的,需要将 mongoose 的环境搭建好,我这里就直接上的是进行操作 MongoDB 的代码。

增加

单个增加:

User.create({name: 'test666', age: 666}, (err, result) => {
if (!err) {
console.log('插入成功');
console.log(result);
}
});

批量增加:

User.create([
{name: 'ls', age: 18},
{name: 'ls', age: 22},
{name: 'ww', age: 21},
{name: 'zl', age: 23},
{name: 'BNTang', age: 33},
],
(err, result) => {
if (!err) {
console.log('插入成功');
console.log(result);
}
});

批量增加(Promise的方式):

(async () => {
let result = await User.create([
{name: 'ls', age: 18},
{name: 'ls', age: 22},
{name: 'ww', age: 21},
{name: 'zl', age: 23},
{name: 'BNTang', age: 33},
]);
console.log(result);
})();

查询

全查询(全字段全数据):

User.find({}, {}, (err, docs) => {
if (!err) {
console.log(docs);
}
});

全查询(只展示指定字段):

User.find({}, {_id: 0, name: 1, age: 1}, (err, docs) => {
if (!err) {
console.log(docs);
}
});

根据条件查询指定条件的数据:

User.find({name: 'BNTang'}, {_id: 0, name: 1, age: 1}, (err, docs) => {
if (!err) {
console.log(docs);
}
});

分页查询:

User.find({}, {_id: 0, name: 1, age: 1}, {skip: 5, limit: 5}, (err, docs) => {
if (!err) {
console.log(docs);
}
});

分页查询(Promise):

(async () => {
let result = await User.find({}, {_id: 0, name: 1, age: 1}, {skip: 5, limit: 5});
console.log(result);
})();



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