export async function register(user: RegisterForm) { const exists = await prisma.user.count({ where: { email: user.email } }) if (exists) { return json({ error: `User already exists with that email` }, { status: 400 }) } + const newUser = await createUser(user) + if (!newUse...
.Project(project.Include("age").Include("name").Include("mark")) .ToList(); docs.ForEach(d => Console.WriteLine(d)); 1. 2. 3. 4. 5. 6. 7. 8. 执行结果如下,我们看到张三的记录已经被删除了: 2 删除多条记录(DeleteMany) 栗子:删除所有年龄大于25岁的记录 var filter = Builders<BsonD...
Fields fields = Fields.from(field1,field2); ProjectionOperation projectAS1 = Aggregation.project(fields);//这时就会只查出uname,uage两列,这种方式默认不会查出_id字段 ProjectionOperation projectAS2 = Aggregation.project("username").andExclude("_id");//只查询username字段,并且把默认展示的_id去掉 1. ...
packagecn.mldn.demo;importcom.gongodb.MOngoClient;publicclassMongoDemoA{publicstaticvoidmain(String[]args)throws Exception{// 设置要连接的数据库的主机名与端口号MongoClient client=newMongoClient("localhost",27001);DBdb=client.getDB("mldn");// 连接数据库// 进行数据库的用户名与密码验证if(db.auth...
/// /// 字段存在(Exists)/// [HttpGet,HttpPost]publicvoidSearchIsExists(){// 连接数据库varclient=newMongoClient("mongodb://localhost:27017/?readPreference=primary&appname=MongoDB%20Compass&ssl=false");// 获取DataBasevarmydb=client.GetDatabase("myDb");// 获取Collectionvarmycollection...
if(key == "PRESIDENT"){ return{"job":key,"names":value,"info":"公司的老大"} } return{"job":key,"names":values}; } -进行操作的整合: db.runCommand({"mapreduce":"emps","map":jobMapFun,"reduce":jobReduceFun,"out":"t_job_emp",”“finalize":jobFinalizeFun}) ...
aggregate([ { $project : { _id: 0, name: 1, stock: 1 } } ]) 6、$unwind 用于将数组字段的每个元素拆分成单独的文档。 示例:在products集合中,展开sizes数组字段。 db.products.aggregate([ { $unwind : "$sizes" } ]) 这些是MongoDB聚合函数的一些示例。还有其他的聚合函数,如$sum、$avg、...
{if(string.IsNullOrWhiteSpace(Servers))thrownewArgumentNullException("Mongo Servers Configuration is Missing!");if(string.IsNullOrWhiteSpace(UserName) ||string.IsNullOrWhiteSpace(Password))thrownewArgumentNullException("Mongo Account Configuration is Missing!");//Base ConfigurationMongoClientSettings settings =new...
3.2、$project控制查询输出的属性 支持四则运算: 加法("$add")、减法("$subtract")、乘法("$multiply")、除法("$divide")、求模("$mod") 支持关系运算: 大小比较("$cmp")、等于("$eq")、大于("$gt")、大于等于("$gte")、小于("$lt")、小于等于("$lte")、不等于("$ne")、判断NULL("$ifNull...
("userinfos");// 查询age<26的记录,包含name、age,排除 _idvar filter = Builders<BsonDocument>.Filter;var project = Builders<BsonDocument>.Projection;var docs = mycollection.Find(filter.Lt("age", 26)) // 过滤.Project(project.Include("name") // 包含name.Include("age") // 包含age....