Update dm & oracle (exp to sql)

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

@@ -9,6 +9,7 @@ namespace SqlSugar
 {
     public partial class DefaultDbMethod : IDbMethods
     {
+        public virtual string ParameterKeyWord { get; set; }= "@";
         public virtual string RowNumber(MethodCallExpressionModel model) 
         {
             if (model.Args.Count == 1)
@@ -901,7 +902,7 @@ namespace SqlSugar
                             }
                         }
                         //Regex regex = new Regex("\@");
-                        if (!sql.Contains("@"))
+                        if (!sql.Contains(ParameterKeyWord))
                         {
                             sql = sql.Replace(" =)", $" = {newValue})");
                             if (!sql.Contains(newValue))
@@ -911,7 +912,7 @@ namespace SqlSugar
                         }
                         else
                         {
-                            Regex reg = new Regex(@"@MethodConst\d+");
+                            Regex reg = new Regex(ParameterKeyWord + @"MethodConst\d+");
                             sql = reg.Replace(sql, it =>
                             {
                                 return " " + newValue + " ";

Src/Asp.Net/SqlSugar/Realization/Dm/SqlBuilder/DmExpressionContext.cs

@@ -54,6 +54,7 @@ namespace SqlSugar
     }
     public partial class DmMethod : DefaultDbMethod, IDbMethods
     {
+        public override string ParameterKeyWord { get; set; } = ":";
         public override string GetStringJoinSelector(string result, string separator)
         {
             return $"listagg(to_char({result}),'{separator}') within group(order by {result}) ";

Src/Asp.Net/SqlSugar/Realization/Oracle/SqlBuilder/OracleExpressionContext.cs

@@ -72,6 +72,7 @@ namespace SqlSugar
     }
     public partial class OracleMethod : DefaultDbMethod, IDbMethods
     {
+        public override string ParameterKeyWord { get; set; } = ":";
         public override string Modulo(MethodCallExpressionModel model)
         {
             return " MOD(" + model.Args[0].MemberName+ " , " + model.Args[1].MemberName+")";