ADD SelectMergeAsTable

Src/Asp.Net/MySqlTest/Demos/8_JoinSql.cs

@@ -1,5 +1,6 @@
 using OrmTest.Demo;
 using OrmTest.Models;
+using SqlSugar;
 using System;
 using System.Collections.Generic;
 using System.Linq;
@@ -16,6 +17,19 @@ namespace OrmTest.Demo
         {
             Where();
             OrderBy();
+            SelectMerge();
+        }
+
+        private static void SelectMerge()
+        {
+            var db = GetInstance();
+            //page join
+            var pageJoin = db.Queryable<Student, School>((st, sc) => new object[] {
+              JoinType.Left,st.SchoolId==sc.Id
+            })
+            .Select((st,sc)=>new { id=st.Id,name=sc.Name})
+            .SelectMergeAsTable().Where(XXX=>XXX.id==1).OrderBy("name asc").ToList();// Prefix, is, not, necessary, and take the columns in select
+
         }
 
         private static void Where()

Src/Asp.Net/MySqlTest/Program.cs

@@ -43,7 +43,7 @@ namespace OrmTest
             OrmTest.Demo.JoinSql.Init();
             OrmTest.Demo.Filter.Init();
             OrmTest.Demo.ComplexModel.Init();
-            OrmTest.Demo.CodeFirst.Init();
+            OrmTest.Demo.CodeFirst.Init();;
         }
     }
 }

Src/Asp.Net/SqlSugar/Abstract/QueryableProvider/QueryableProvider.cs

@@ -410,6 +410,14 @@ namespace SqlSugar
             QueryBuilder.SelectValue = selectValue;
             return this;
         }
+        public virtual ISugarQueryable<T> SelectMergeAsTable()
+        {
+            Check.Exception(this.QueryBuilder.SelectValue.IsNullOrEmpty(), "SelectMergeAsTable need to use Select(it=>new{}) Method .");
+            Check.Exception(this.QueryBuilder.Skip > 0 || this.QueryBuilder.Take > 0, "SelectMergeAsTable  Queryable cannot Take Skip OrderBy PageToList  ");
+            var sql = QueryBuilder.ToSqlString();
+            var tableName = (string.Format("({0}) MergeAsTable ", sql));
+            return this.Context.Queryable<ExpandoObject>().AS(tableName).Select<T>("*");
+        }
 
         public virtual int Count()
         {

Src/Asp.Net/SqlSugar/Interface/IQueryable.cs

@@ -62,7 +62,7 @@ namespace SqlSugar
         ISugarQueryable<TResult> Select<TResult>(Expression<Func<T, TResult>> expression);
         ISugarQueryable<TResult> Select<TResult>(string select);
         ISugarQueryable<T> Select(string select);
-
+        ISugarQueryable<T> SelectMergeAsTable();
 
         int Count();
         TResult Max<TResult>(string maxField);