From 9be7691d3da544d65f869f6baaa5aec2c126a552 Mon Sep 17 00:00:00 2001
From: sunkaixuan <610262374@qq.com>
Date: Sat, 9 Jul 2022 03:16:12 +0800
Subject: [PATCH] Add Sqlfunc.Stuff

---
 .../ExpressionsToSql/DbMethods/DefaultDbMethod.cs         | 8 ++++++++
 .../SqlSugar/ExpressionsToSql/DbMethods/IDbMethods.cs     | 1 +
 .../SqlSugar/ExpressionsToSql/DbMethods/SqlFunc.cs        | 6 ++++++
 .../ResolveItems/MethodCallExpressionResolve.cs           | 2 ++
 4 files changed, 17 insertions(+)

diff --git a/Src/Asp.Net/SqlSugar/ExpressionsToSql/DbMethods/DefaultDbMethod.cs b/Src/Asp.Net/SqlSugar/ExpressionsToSql/DbMethods/DefaultDbMethod.cs
index 124b6a790..5b0c0c577 100644
--- a/Src/Asp.Net/SqlSugar/ExpressionsToSql/DbMethods/DefaultDbMethod.cs
+++ b/Src/Asp.Net/SqlSugar/ExpressionsToSql/DbMethods/DefaultDbMethod.cs
@@ -544,5 +544,13 @@ namespace SqlSugar
         {
             return model.Args[0].MemberName + " DESC ";
         }
+        public virtual string Stuff(MethodCallExpressionModel model) 
+        {
+            var parameter1 = model.Args[0];
+            var parameter2 = model.Args[1];
+            var parameter3 = model.Args[2];
+            var parameter4 = model.Args[3];
+            return $" STUFF ({parameter1.MemberName}, {parameter2.MemberName}, {parameter3.MemberName},  {parameter4.MemberName}) ";
+        }
     }
 }
diff --git a/Src/Asp.Net/SqlSugar/ExpressionsToSql/DbMethods/IDbMethods.cs b/Src/Asp.Net/SqlSugar/ExpressionsToSql/DbMethods/IDbMethods.cs
index 746af359c..d81e8af07 100644
--- a/Src/Asp.Net/SqlSugar/ExpressionsToSql/DbMethods/IDbMethods.cs
+++ b/Src/Asp.Net/SqlSugar/ExpressionsToSql/DbMethods/IDbMethods.cs
@@ -85,5 +85,6 @@ namespace SqlSugar
         string LessThanOrEqual(MethodCallExpressionModel model);
         string Asc(MethodCallExpressionModel model);
         string Desc(MethodCallExpressionModel model);
+        string Stuff(MethodCallExpressionModel model);
     }
 }
diff --git a/Src/Asp.Net/SqlSugar/ExpressionsToSql/DbMethods/SqlFunc.cs b/Src/Asp.Net/SqlSugar/ExpressionsToSql/DbMethods/SqlFunc.cs
index 23f80679f..c39192d82 100644
--- a/Src/Asp.Net/SqlSugar/ExpressionsToSql/DbMethods/SqlFunc.cs
+++ b/Src/Asp.Net/SqlSugar/ExpressionsToSql/DbMethods/SqlFunc.cs
@@ -25,6 +25,12 @@ namespace SqlSugar
         {
             throw new NotSupportedException("Can only be used in expressions");
         }
+
+        public static string Stuff(string sourceString, int start, int length, string AddString)
+        {
+            throw new NotSupportedException("Can only be used in expressions");
+        }
+
         public static bool GreaterThanOrEqual(object thisValue, object gtValue)
         {
             throw new NotSupportedException("Can only be used in expressions");
diff --git a/Src/Asp.Net/SqlSugar/ExpressionsToSql/ResolveItems/MethodCallExpressionResolve.cs b/Src/Asp.Net/SqlSugar/ExpressionsToSql/ResolveItems/MethodCallExpressionResolve.cs
index 9c93febc4..3ffa6fb7f 100644
--- a/Src/Asp.Net/SqlSugar/ExpressionsToSql/ResolveItems/MethodCallExpressionResolve.cs
+++ b/Src/Asp.Net/SqlSugar/ExpressionsToSql/ResolveItems/MethodCallExpressionResolve.cs
@@ -998,6 +998,8 @@ namespace SqlSugar
                         return this.Context.DbMehtods.Asc(model);
                     case "Desc":
                         return this.Context.DbMehtods.Desc(model);
+                    case "Stuff":
+                        return this.Context.DbMehtods.Stuff(model);
                     default:
                         break;
                 }