Support Subquery.Having

Src/Asp.Net/SqlServerTest/Demo/Demo1_Queryable.cs

@@ -153,6 +153,7 @@ namespace OrmTest
               JoinType.Left, o.Name == SqlFunc.ToString(SqlFunc.MergeString(",", i.Name, ","))
             ))
             .Select<ViewOrder>().ToList();
+            var test16 = db.Queryable<Order>().Select(it => SqlFunc.SqlServer_DateDiff("day", DateTime.Now.AddDays(-1), DateTime.Now)).ToList();
             Console.WriteLine("#### Examples End ####");
         }
 
@@ -242,8 +243,11 @@ namespace OrmTest
              .Where(i=>i.ItemId==1)
               .Any()
             ).ToList();
-
+;
-            var list3=db.Queryable<Order>().Select(it => SqlFunc.SqlServer_DateDiff("day", DateTime.Now.AddDays(-1), DateTime.Now)).ToList();
+            var list3 = db.Queryable<Order>().Select(it => new
+            {
+                customName = SqlFunc.Subqueryable<Custom>().Where(s=>s.Id==it.CustomId).GroupBy(s=>s.Name).Having(s=>SqlFunc.AggregateCount(s.Id)>0).Select(s => s.Name) 
+            }).ToList();
 
             Console.WriteLine("#### Subquery End ####");
         }

Src/Asp.Net/SqlSugar/ExpressionsToSql/Subquery/Items/SubHaving.cs

@@ -0,0 +1,51 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Linq.Expressions;
+using System.Text;
+using System.Text.RegularExpressions;
+
+namespace SqlSugar
+{
+    public class SubHaving : ISubOperation
+    {
+        public bool HasWhere
+        {
+            get; set;
+        }
+
+        public string Name
+        {
+            get { return "Having"; }
+        }
+
+        public Expression Expression
+        {
+            get; set;
+        }
+
+        public int Sort
+        {
+            get
+            {
+                return 480;
+            }
+        }
+
+        public ExpressionContext Context
+        {
+            get; set;
+        }
+
+        public string GetValue(Expression expression)
+        {
+            var exp = expression as MethodCallExpression;
+            var argExp = exp.Arguments[0];
+            var result = "Having " + SubTools.GetMethodValue(Context, argExp, ResolveExpressType.WhereMultiple);
+            var selfParameterName = Context.GetTranslationColumnName((argExp as LambdaExpression).Parameters.First().Name) + UtilConstants.Dot;
+            if (this.Context.JoinIndex == 0)
+                result = result.Replace(selfParameterName, SubTools.GetSubReplace(this.Context));
+            return result;
+        }
+    }
+}

Src/Asp.Net/SqlSugar/ExpressionsToSql/Subquery/SubTools.cs

@@ -32,7 +32,8 @@ namespace SqlSugar
                                                     new SubOrderBy(){ Context=Context },
                                                     new SubOrderByDesc(){ Context=Context },
                                                     new SubGroupBy(){ Context=Context},
-                                                    new SubAs(){Context=Context}
+                                                    new SubAs(){Context=Context},
+                                                    new SubHaving(){  Context=Context}
                                                 };
         }
 

Src/Asp.Net/SqlSugar/ExpressionsToSql/Subquery/Subquerable.cs

@@ -31,6 +31,10 @@ namespace SqlSugar
         {
             return this;
         }
+        public Subqueryable<T> Having(Func<T, bool> expression)
+        {
+            return this;
+        }
         public Subqueryable<T> Where<Main, Join1>(Func<Main, Join1, bool> expression)
         {
             return this;

Src/Asp.Net/SqlSugar/SqlSugar.csproj

@@ -90,6 +90,7 @@
     <Compile Include="Abstract\DeleteProvider\DeleteableProvider.cs" />
     <Compile Include="Entities\SqlSguarTransaction.cs" />
     <Compile Include="ExpressionsToSql\Subquery\Items\SubAs.cs" />
+    <Compile Include="ExpressionsToSql\Subquery\Items\SubHaving.cs" />
     <Compile Include="Interface\ISugarRepository.cs" />
     <Compile Include="Interface\IParameterInsertable.cs" />
     <Compile Include="Abstract\InsertableProvider\ParameterInsertable.cs" />