Exp to sql

Src/Asp.NetCore2/SqlSugar/ExpressionsToSql/Common/ExpressionResult.cs

@@ -147,6 +147,13 @@ namespace SqlSugar
                 default:
                     break;
             }
+            if (this.Result.Length > 0 && this.Result[this.Result.Length - 1] == ',')
+            {
+                if (parameter?.ToString()?.StartsWith("  AS ") ==true && parameter?.ToString()?.EndsWith(" ,")==true) 
+                {
+                    this.Result.Length--; // 直接删掉最后一个字符
+                }
+            }
             this.Result.Append(parameter);
         }
 

Src/Asp.NetCore2/SqlSugar/ExpressionsToSql/ResolveItems/ConditionalExpressionResolve.cs

@@ -27,6 +27,7 @@ namespace SqlSugar
                         var value = ExpressionTool.DynamicInvoke(express.Test);
                         if (value is bool boolValue)
                         {
+                            args[0] = boolValue ? UtilConstants.ExpTrue :UtilConstants.ExpFalse;
                             // 根据结果选择分支
                             var next = boolValue ? express.IfTrue : express.IfFalse;
                             args[1] = next;

Src/Asp.NetCore2/SqlSugar/Utilities/UtilConstants.cs

@@ -3,6 +3,7 @@ using System.Collections.Generic;
 using System.Dynamic;
 using System.Globalization;
 using System.Linq;
+using System.Linq.Expressions;
 using System.Text;
 namespace SqlSugar
 {
@@ -77,5 +78,8 @@ namespace SqlSugar
                 "Millisecond",
                 "Date"
         };
+
+        public static ConstantExpression ExpTrue = Expression.Constant(true);
+        public static ConstantExpression ExpFalse = Expression.Constant(false);
     }
 }