.net數(shù)據(jù)庫(kù)操作框架SqlSugar的簡(jiǎn)單入門

更新時(shí)間：2021年04月28日 10:02:26 作者：果糖大數(shù)據(jù)科技

這篇文章主要介紹了.net數(shù)據(jù)庫(kù)操作框架SqlSugar的簡(jiǎn)單入門，幫助大家更好的理解和學(xué)習(xí)使用.net技術(shù)，感興趣的朋友可以了解下

介紹

SqlSugar是一款老牌 .NET數(shù)據(jù)庫(kù)操作框架，由果糖大數(shù)據(jù)科技團(tuán)隊(duì)維護(hù)和更新，Github star數(shù)僅次于EF 和 Dapper

優(yōu)點(diǎn)：簡(jiǎn)單易用、功能齊全、高性能、輕量級(jí)、服務(wù)齊全、有專業(yè)技術(shù)支持一天18小時(shí)服務(wù)

支持?jǐn)?shù)據(jù)庫(kù)：MySql、SqlServer、Sqlite、Oracle 、 postgresql、達(dá)夢(mèng)、人大金倉(cāng)

框架新功能

最新穩(wěn)定版本5.0.2.8 ，發(fā)布后1個(gè)月時(shí)間NUGET下載量達(dá)到5000的版本，用戶使用也相當(dāng)滿意

而在穩(wěn)定版本的基礎(chǔ)上又布了5.0.2.9版本

加入3大新功能

1. 配置查詢

解決了大量字典表和簡(jiǎn)單就為取一個(gè)name 就要寫聯(lián)表的問題，讓單表查詢解決一切

2.多租戶+倉(cāng)儲(chǔ)+自動(dòng)分配

3.行轉(zhuǎn)列

1、配置查詢

解決了大量字典表和簡(jiǎn)單就為取一個(gè)name 就要寫聯(lián)表的問題，讓單表查詢解決一切

字典表我相信大家都全用到，他們可以方便的存儲(chǔ)性別、學(xué)歷、崗位等一串?dāng)?shù)據(jù) 并進(jìn)行TypeId進(jìn)行區(qū)分

1.1 創(chuàng)建測(cè)試數(shù)據(jù)

創(chuàng)建一個(gè)字典實(shí)體

public class DataDictionary
{
    public string Code { get; set; }
    public string Name { get; set; }
    public string Type { get; set; }
}

創(chuàng)建字典表并向里面插入測(cè)試數(shù)據(jù)　　

var db = GetInstance();
            List<DataDictionary> datas = new List<DataDictionary>();
            datas.Add(new DataDictionary() { Code="1", Name="男",Type="sex" });
            datas.Add(new DataDictionary() { Code = "2", Name = "女", Type = "sex" });
            datas.Add(new DataDictionary() { Code = "1", Name = "南通市", Type = "city" });
            datas.Add(new DataDictionary() { Code = "2", Name = "蘇州市", Type = "city" });
            datas.Add(new DataDictionary() { Code = "1", Name = "江蘇省", Type = "province" });
            datas.Add(new DataDictionary() { Code = "2", Name = "湖南省", Type = "province" });
 
            db.CodeFirst.InitTables<DataDictionary>();//這樣就能根據(jù)實(shí)體建表了
            db.Insertable(datas).ExecuteCommand();//這樣就能把數(shù)據(jù)插進(jìn)數(shù)據(jù)庫(kù)了<br>

在建一個(gè)Person表　

public class Person
{
    //數(shù)據(jù)庫(kù)字段
    [SqlSugar.SugarColumn(IsPrimaryKey =true,IsIdentity =true)]
    public int Id { get; set; }
    public string Name { get; set; }
    public int SexId { get; set; }
    public int CityId { get; set; }
    public int ProvinceId { get; set; }
 
    //非數(shù)據(jù)庫(kù)字段
    [SqlSugar.SugarColumn(IsIgnore =true)]
    public string SexName { get; set; }
    [SqlSugar.SugarColumn(IsIgnore = true)]
    public string CityName { get; set; }
    [SqlSugar.SugarColumn(IsIgnore = true)]
    public string ProviceName { get; set; }
}

1.2 傳統(tǒng)字典聯(lián)表實(shí)現(xiàn)缺點(diǎn)

如果我們要將Person中的非數(shù)據(jù)字典查詢出來那么我們就需要寫有2種實(shí)現(xiàn)方式

1.連表或者子查詢（缺點(diǎn) 寫起來很浪費(fèi)時(shí)間）

2.將字典存到內(nèi)存，通過內(nèi)存賦值（缺點(diǎn) 字典表超過1000條以上性能很差，并且不能排序，或者LIKE）

下面介紹通過SqlSugar的配置查詢解決上2面?zhèn)€難題

1.3 配置表簡(jiǎn)化字典聯(lián)表

配置字典表

if (!db.ConfigQuery.Any())
   {
                var types= db.Queryable<DataDictionary>().Select(it => it.Type).Distinct().ToList();
                foreach (var type in types)
                {
                    db.ConfigQuery.SetTable<DataDictionary>(it => it.Code, it => it.Name, type, it => it.Type == type);
                }
                //如果其中Code都是唯一值可以按 1.4中的用法使用循環(huán)都不要
}

配置完我們查詢就會(huì)很方便了

   var res=db.Queryable<Person>().Select(it => new Person()
   {
                 Id=it.Id.SelectAll(),
                 SexName=it.SexId.GetConfigValue<DataDictionary>("sex"),
                 ProvinceName = it.ProvinceId.GetConfigValue<DataDictionary>("province"),
                 CityName = it.CityId.GetConfigValue<DataDictionary>("city"),
   }).ToList();
 
//也支持支持寫在Where或者Orderby

1.4 簡(jiǎn)單聯(lián)表查詢也可以配置

db.ConfigQuery.SetTable<Order>(it => it.Id, it => it.Name);//配置Order<br>
var list3 = db.Queryable<OrderItem>().Select(it => new OrderItem
{
        ItemId = it.ItemId.SelectAll(),
        OrderName = it.OrderId.GetConfigValue<Order>() //查詢的時(shí)候直接用
}).ToList();

總結(jié)：配置表查詢的方式可以大大降低重復(fù)聯(lián)表問題，并且配置好后基本就不要寫JOIN了　

2、多租戶+倉(cāng)儲(chǔ)+自動(dòng)分配

SqlSugar多租戶是通過ConfigId進(jìn)行識(shí)別連接哪個(gè)庫(kù)，新版本添加了實(shí)體配置ConfigId

[TenantAttribute("1")]
  public class C1Table
  {
     public string Id { get; set; }
  }
 
  [TenantAttribute("2")]
  public class C2Table
  {
      public string Id { get; set; }
  }

下面我們倉(cāng)儲(chǔ)就可以通過實(shí)體配置自動(dòng)識(shí)別是連接哪個(gè)庫(kù)

public class Repository<T> : SimpleClient<T> where T : class, new()
    {
        public Repository(ISqlSugarClient context = null) : base(context)//注意這里要有默認(rèn)值等于null
        {
            if (context == null)
            {
                var db = new SqlSugarClient(new List<ConnectionConfig> {
                                                    new ConnectionConfig()
                                                {
                                                    ConfigId="1",
                                                    DbType = SqlSugar.DbType.SqlServer,
                                                    IsAutoCloseConnection = true,
                                                    ConnectionString = Config.ConnectionString
                                                },
                                                    new ConnectionConfig()
                                                {
                                                    ConfigId="2",
                                                    DbType = SqlSugar.DbType.SqlServer,
                                                    IsAutoCloseConnection = true,
                                                    ConnectionString = Config.ConnectionString2
                                                }
                });
                base.Context = db;
                var configId = typeof(T).GetCustomAttribute<TenantAttribute>().configId;
                db.ChangeDatabase(configId);
            }
        }
 
        /// <summary>
        /// 擴(kuò)展方法，自帶方法不能滿足的時(shí)候可以添加新方法
        /// </summary>
        /// <returns></returns>
        public List<T> CommQuery(string sql)
        {
            //base.Context.Queryable<T>().ToList();可以拿到SqlSugarClient 做復(fù)雜操作
            return base.Context.Queryable<T>().Where(sql).ToList();
        }
 
    }

新版本還添加了切換倉(cāng)儲(chǔ)功能

public class C1Service : Repository<C1Table>
{
    public void Test()
    {
        base.AsTenant().BeginTran();
 
        base.GetList(); //調(diào)用內(nèi)部倉(cāng)儲(chǔ)方法
        base.ChangeRepository<Repository<C2Table>>().GetList();//調(diào)用外部倉(cāng)儲(chǔ)
 
        base.AsTenant().CommitTran();
    }
}

3、行列互轉(zhuǎn)功能　

第一個(gè)參數(shù) 列名、第二個(gè)參數(shù) 頭行名、第三個(gè)參數(shù) 值

var test06 = db.Queryable<Order>()
                   .ToPivotTable(it => it.Id, it => it.Name, it => it.Sum(x => x.Price));//返回Datatable
 
 var test07 = db.Queryable<Order>()
            .ToPivotList(it => it.Id, it => it.Name, it => it.Sum(x => x.Price));//返回List<dynamic><br>
var test08 = db.Queryable<Order>()
            .ToPivotJson(it => it.Id, it => it.Name, it => it.Sum(x => x.Price));//返回Json

.NET數(shù)據(jù)庫(kù)框架源碼

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