Exp to sql ：CompareTo

Src/Asp.NetCore2/SqlSugar/ExpressionsToSql/DbMethods/DefaultDbMethod.cs

@@ -689,5 +689,11 @@ namespace SqlSugar
         {
             throw new NotImplementedException("Current database no support");
         }
+        public string CompareTo(MethodCallExpressionModel model) 
+        {
+            var parameterNameA=model.Args[0].MemberName;
+            var parameterNameB = model.Args[0].MemberName;
+            return $"(case when   '{parameterNameA}'>'{parameterNameB}'  then 1   when '{parameterNameA}'='{parameterNameB}' then 0 else -1 end)";
+        }
     }
 }

Src/Asp.NetCore2/SqlSugar/ExpressionsToSql/DbMethods/IDbMethods.cs

@@ -102,5 +102,6 @@ namespace SqlSugar
         string AggregateSumNoNull(MethodCallExpressionModel model);
         string JsonListObjectAny(MethodCallExpressionModel model);
         string JsonArrayAny(MethodCallExpressionModel model);
+        string CompareTo(MethodCallExpressionModel model);
     }
 }

Src/Asp.NetCore2/SqlSugar/ExpressionsToSql/DbMethods/SqlFunc.cs

@@ -9,6 +9,10 @@ namespace SqlSugar
 {
     public partial class SqlFunc
     {
+        public static int CompareTo(string strA, string strB) 
+        {
+            throw new NotSupportedException("Can only be used in expressions");
+        }
         public static int RowNumber(object orderByField, object partitionBy) 
         {
             throw new NotSupportedException("Can only be used in expressions");

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

@@ -756,6 +756,8 @@ namespace SqlSugar
                         return this.Context.DbMehtods.JsonListObjectAny(model);
                     case "JsonArrayAny":
                         return this.Context.DbMehtods.JsonArrayAny(model);
+                    case "CompareTo":
+                        return this.Context.DbMehtods.CompareTo(model);
                     default:
                         break;
                 }