Update Select Json bug

Src/Asp.Net/PgSqlTest/Bugs/BugTest4.cs

@@ -0,0 +1,46 @@
+using SqlSugar;
+using System;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace OrmTest.Test
+{
+    public class BugTest4
+    {
+        public static void Init()
+        {
+            SqlSugarClient Db = new SqlSugarClient(new ConnectionConfig()
+            {
+                ConnectionString = @"PORT=5433;DATABASE=x;HOST=localhost;PASSWORD=haosql;USER ID=postgres",
+                DbType = DbType.PostgreSQL,
+                IsAutoCloseConnection = true,
+           
+                InitKeyType = InitKeyType.Attribute,
+            });
+            //调式代码 用来打印SQL 
+            Db.Aop.OnLogExecuting = (sql, pars) =>
+            {
+               Console.WriteLine(sql);
+            };
+
+            Db.CodeFirst.InitTables(typeof(testmmxxxmm121));
+            Db.Insertable(new testmmxxxmm121() { name = (float) 0.01 , name2 = 1 }).ExecuteCommand();
+            var list= Db.Queryable<testmmxxxmm121>().ToList();
+        }
+    }
+
+    public class testmmxxxmm121
+    {
+        [SugarColumn(IsPrimaryKey =true,IsIdentity =true)]
+        public int id { get; set; }
+        [SugarColumn(ColumnDataType ="float4",IsNullable =true)]
+        public float? name { get; set; }
+        [SugarColumn(ColumnDataType = "float4", IsNullable = false)]
+        public float? name2 { get; set; }
+
+    }
+
+}