.net数据库操作框架SqlSugar的简单入门

介绍

SqlSugar是一款 老牌 .NET数据库操作框架,由果糖大数据科技团队维护和更新 ,Github star数仅次于EF 和 Dapper

优点: 简单易用、功能齐全、高性能、轻量级、服务齐全、有专业技术支持一天18小时服务

支持数据库:MySql、SqlServer、Sqlite、Oracle 、 postgresql、达梦、人大金仓

框架新功能

最新稳定版本5.0.2.8 ,发布后1个月时间NUGET下载量达到5000的版本,用户使用也相当满意

而在稳定版本的基础上又布了5.0.2.9版本

加入3大新功能

1. 配置查询 

解决了大量字典表和简单就为取一个name 就要写联表的问题,让单表查询解决一切

2.多租户+仓储+自动分配

3.行转列

1、配置查询

解决了大量字典表和简单就为取一个name 就要写联表的问题,让单表查询解决一切

字典表我相信大家都全用到,他们可以方便的存储性别、学历、岗位等 一串数据 并进行TypeId进行区分

1.1 创建测试数据

创建一个字典实体

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

创建字典表并向里面插入测试数据  

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 = "苏州市", Type = "city" });
            datas.Add(new DataDictionary() { Code = "1", Name = "江苏省", Type = "province" });
            datas.Add(new DataDictionary() { Code = "2", Name = "湖南省", Type = "province" });
 
            db.CodeFirst.InitTables<DataDictionary>();//这样就能根据实体建表了
            db.Insertable(datas).ExecuteCommand();//这样就能把数据插进数据库了<br>

在建一个Person表 

public class Person
{
    //数据库字段
    [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; }
 
    //非数据库字段
    [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 传统字典联表实现缺点

如果我们要将Person中的非数据字典查询出来那么我们就需要写有2种实现方式

1.连表或者子查询 (缺点 写起来很浪费时间)

2.将字典存到内存,通过内存赋值 (缺点 字典表超过1000条以上性能很差 ,并且不能排序,或者LIKE)

下面介绍通过SqlSugar的配置查询解决上2面个难题

1.3 配置表简化字典联表

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中的用法使用循环都不要
}

配置完我们查询就会很方便了

   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();
 
//也支持支持写在Where或者Orderby 

1.4 简单联表查询也可以配置

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>() //查询的时候直接用
}).ToList();

 总结:配置表查询的方式可以大大降低重复联表问题,并且配置好后基本就不要写JOIN了 

2、多租户+仓储+自动分配

SqlSugar多租户是通过ConfigId进行识别连接哪个库,新版本添加了实体配置ConfigId

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

下面我们仓储就可以通过实体配置自动识别是连接哪个库

public class Repository<T> : SimpleClient<T> where T : class, new()
    {
        public Repository(ISqlSugarClient context = null) : base(context)//注意这里要有默认值等于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>
        /// 扩展方法,自带方法不能满足的时候可以添加新方法
        /// </summary>
        /// <returns></returns>
        public List<T> CommQuery(string sql)
        {
            //base.Context.Queryable<T>().ToList();可以拿到SqlSugarClient 做复杂操作
            return base.Context.Queryable<T>().Where(sql).ToList();
        }
 
    }

新版本还添加了切换仓储功能

public class C1Service : Repository<C1Table>
{
    public void Test()
    {
        base.AsTenant().BeginTran();
 
        base.GetList(); //调用内部仓储方法
        base.ChangeRepository<Repository<C2Table>>().GetList();//调用外部仓储
 
        base.AsTenant().CommitTran();
    }
}

3、行列互转功能 

第一个参数 列名、第二个参数 头行名、第三个参数 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

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