随着NoSQL的应用越来越广泛,很多面试都需要熟悉了解NoSQL【如:Redis,MongoDB等】,本文以一个简单的小例子,简述如何通过C#来操作MongoDB,进行数据的读写操作,仅供学习分享使用,如有不足之处,还请指正。
项目--右键--管理Nuget程序包--打卡Nuget包管理器--浏览搜索MongoDB.Driver--安装。如下所示:
示例虽小,实现了查询,条件查询,明细显示,新增等功能,如下所示:
新增功能
其实关于数据库的操作步骤,基本上大同小异,如下所示:
为了代码的公用,本例对MongoDB的操作代码进行了封装,如下所示:
1 using System; 2 using System.Collections.Generic; 3 using System.Linq; 4 using System.Text; 5 using System.Threading.Tasks; 6 using MongoDB.Driver; 7 using MongoDB.Bson; 8 using MongoDB.Bson.Serialization; 9 using System.Web.Script.Serialization; 10 11 namespace DemoMongo.Common 12 { 13 /// <summary> 14 /// Mongo帮助类 15 /// </summary> 16 public class MongoHelper<T> 17 { 18 private string connStr = "";//服务器网址 19 20 private string dbName = "";//数据库名称 21 22 private IMongoClient client;//连接客户端 23 24 private IMongoDatabase db;//连接数据库 25 26 private string collName ;//集合名称 27 28 public MongoHelper() { 29 30 } 31 32 public MongoHelper(string connStr,string dbName,string collName) { 33 this.connStr = connStr; 34 this.dbName = dbName; 35 this.collName = collName; 36 this.Init(); 37 } 38 39 /// <summary> 40 /// 初始化连接客户端 41 /// </summary> 42 private void Init() 43 { 44 if (client == null) 45 { 46 client = new MongoClient(this.connStr); 47 } 48 if (db == null) { 49 db = client.GetDatabase(this.dbName); 50 } 51 } 52 53 /// <summary> 54 /// 插入对象 55 /// </summary> 56 /// <typeparam name="T"></typeparam> 57 /// <param name="obj"></param> 58 public void Insert(T obj) 59 { 60 IMongoCollection<T> collention = db.GetCollection<T>(collName); 61 collention.InsertOneAsync(obj); 62 } 63 64 /// <summary> 65 /// 字典形式插入 66 /// </summary> 67 /// <param name="dicInfo"></param> 68 public void Insert(Dictionary<string,string> dicInfo) 69 { 70 var collection = db.GetCollection<BsonDocument>(collName); 71 var document = new BsonDocument(dicInfo); 72 collection.InsertOne(document); 73 } 74 75 /// <summary> 76 /// 无条件查询,即返回全部 77 /// </summary> 78 /// <returns></returns> 79 public List<T> Query() { 80 var collection = db.GetCollection<BsonDocument>(collName); 81 var rest = collection.Find(Builders<BsonDocument>.Filter.Empty); 82 return rest.As<T>().ToList(); 83 } 84 85 /// <summary> 86 /// 按名称进行查询 87 /// </summary> 88 /// <param name="name"></param> 89 /// <returns></returns> 90 public List<T> Query(object name) { 91 var collection = db.GetCollection<T>(collName); 92 var rest = collection.Find(Builders<T>.Filter.Eq("name",name)); 93 return rest.As<T>().ToList(); 94 } 95 96 97 /// <summary> 98 /// 只查询一条 99 /// </summary> 100 /// <param name="Id"></param> 101 /// <returns></returns> 102 public string QueryOne(string Id) { 103 var collection = db.GetCollection<T>(collName); 104 var rest = collection.Find(Builders<T>.Filter.Eq("Id",new ObjectId(Id))).Limit(1); 105 106 T t = rest.As<T>().ToList()[0]; 107 JavaScriptSerializer jserializer = new JavaScriptSerializer(); 108 string strJson = jserializer.Serialize(t); 109 return strJson; 110 } 111 } 112 }
代码调用
1 using System; 2 using System.Collections.Generic; 3 using System.ComponentModel; 4 using System.Configuration; 5 using System.Data; 6 using System.Drawing; 7 using System.IO; 8 using System.Linq; 9 using System.Text; 10 using System.Threading.Tasks; 11 using System.Windows.Forms; 12 using DemoMongo.Common; 13 14 namespace DemoMongo 15 { 16 public partial class FrmMain : Form 17 { 18 private MongoHelper<Student> helper; 19 20 public FrmMain() 21 { 22 InitializeComponent(); 23 string connStr = ConfigurationManager.AppSettings["connStr"]; 24 string dbName = ConfigurationManager.AppSettings["dbName"]; 25 string collName = "student"; 26 helper = new MongoHelper<Student>(connStr,dbName,collName); 27 28 } 29 30 private void FrmMain_Load(object sender, EventArgs e) 31 { 32 List<Student> list = helper.Query(); 33 this.dgView.AutoGenerateColumns = false; 34 this.bsView.DataSource = list; 35 this.dgView.DataSource = bsView; 36 } 37 38 private void btnQuery_Click(object sender, EventArgs e) 39 { 40 string name = this.txtName.Text.Trim(); 41 42 List<Student> list = new List<Student>(); 43 if (string.IsNullOrEmpty(name)) 44 { 45 list = helper.Query(); 46 } 47 else { 48 //注意:此处姓名在MongoDB中存储的数据类型不是固定的,可能是字符串也可能是整数,所以需要判断,否则查询不出来 49 int name1 = 0; 50 if (int.TryParse(name, out name1)) 51 { 52 list = helper.Query(name1); 53 } 54 else { 55 list = helper.Query(name); 56 } 57 58 } 59 this.dgView.AutoGenerateColumns = false; 60 this.bsView.DataSource = list; 61 this.dgView.DataSource = bsView; 62 } 63 64 private void btnAdd_Click(object sender, EventArgs e) 65 { 66 FrmAdd add = new FrmAdd(this.helper); 67 add.ShowDialog(); 68 btnQuery_Click(sender, e); 69 } 70 71 private void dgView_CellClick(object sender, DataGridViewCellEventArgs e) 72 { 73 //只有当第0列被点击时才生效 74 if (e.ColumnIndex == 0) 75 { 76 string id = ((Student)dgView.CurrentRow.DataBoundItem).Id.ToString(); 77 string student = helper.QueryOne(id); 78 this.txtContent.Text = JsonHelper.ConvertJsonString(student); 79 } 80 } 81 82 } 83 }
以上就是C#对于MongoDB的基础操作,旨在抛砖引玉,共同进步。
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