Update pgsql

Src/Asp.Net/SqlSugar/Abstract/DbMaintenanceProvider/Methods.cs

@@ -441,7 +441,7 @@ namespace SqlSugar
         #endregion
 
         #region Private
-        private List<T> GetListOrCache<T>(string cacheKey, string sql)
+        protected List<T> GetListOrCache<T>(string cacheKey, string sql)
         {
             return this.Context.Utilities.GetReflectionInoCacheInstance().GetOrCreate(cacheKey,
              () =>

Src/Asp.Net/SqlSugar/Realization/PostgreSQL/DbMaintenance/PostgreSQLDbMaintenance.cs

@@ -406,8 +406,16 @@ namespace SqlSugar
                                and kcu.constraint_name = tco.constraint_name
                                where tco.constraint_type = 'PRIMARY KEY'
                                and kcu.table_schema='public' and 
-                               upper(kcu.table_name)=upper('{tableName}')";
-                var pkList = this.Context.Ado.SqlQuery<string>(sql);
+                               upper(kcu.table_name)=upper('{tableName.TrimEnd('"').TrimStart('"')}')";
+                List<string> pkList = new List<string>();
+                if (isCache)
+                {
+                    pkList=GetListOrCache<string>("GetColumnInfosByTableName_N_Pk"+tableName, sql);
+                }
+                else
+                {
+                    pkList = this.Context.Ado.SqlQuery<string>(sql);
+                }
                 if (pkList.Count >1) 
                 {
                     foreach (var item in result)

Src/Asp.Net/SqlSugar/Realization/PostgreSQL/SqlBuilder/PostgreSQLExpressionContext.cs

@@ -210,6 +210,12 @@ namespace SqlSugar
             return string.Format(" ( to_char({0},'yyyy-MM-dd')=to_char({1},'yyyy-MM-dd') ) ", parameter.MemberName, parameter2.MemberName); ;
         }
 
+        public override string HasValue(MethodCallExpressionModel model)
+        {
+            var parameter = model.Args[0];
+            return string.Format("( {0} IS NOT NULL )", parameter.MemberName);
+        }
+
         public override string DateIsSameByType(MethodCallExpressionModel model)
         {
             var parameter = model.Args[0];