From b0caaf47be60e3f3c84ce8ebfe2213dc7b00a9cb Mon Sep 17 00:00:00 2001
From: sunkaixuan <610262374@qq.com>
Date: Thu, 4 Feb 2021 17:18:21 +0800
Subject: [PATCH] Add  sqlfunc tochar todate   datediff

---
 .../DbMethods/DefaultDbMethod.cs              | 20 +++++++++++++++++++
 .../ExpressionsToSql/DbMethods/IDbMethods.cs  |  4 ++++
 .../ExpressionsToSql/DbMethods/SqlFunc.cs     |  3 +++
 .../MethodCallExpressionResolve.cs            |  6 ++++++
 4 files changed, 33 insertions(+)

diff --git a/Src/Asp.Net/SqlSugar/ExpressionsToSql/DbMethods/DefaultDbMethod.cs b/Src/Asp.Net/SqlSugar/ExpressionsToSql/DbMethods/DefaultDbMethod.cs
index e55079a44..d555e08ed 100644
--- a/Src/Asp.Net/SqlSugar/ExpressionsToSql/DbMethods/DefaultDbMethod.cs
+++ b/Src/Asp.Net/SqlSugar/ExpressionsToSql/DbMethods/DefaultDbMethod.cs
@@ -443,5 +443,25 @@ namespace SqlSugar
             var parameter2 = model.Args[1];
             return string.Format(" ({0} | {1}) ", parameter.MemberName, parameter2.MemberName); ;
         }
+
+        public string Oracle_ToDate(MethodCallExpressionModel model)
+        {
+            var parameter = model.Args[0];
+            var parameter2 = model.Args[1];
+            return string.Format(" to_date({0},{1}) ", parameter.MemberName, parameter2.MemberName); ;
+        }
+        public string Oracle_ToChar(MethodCallExpressionModel model)
+        {
+            var parameter = model.Args[0];
+            var parameter2 = model.Args[1];
+            return string.Format("to_char({0},{1}) ", parameter.MemberName, parameter2.MemberName); ;
+        }
+        public string SqlServer_DateDiff(MethodCallExpressionModel model)
+        {
+            var parameter = model.Args[0];
+            var parameter2 = model.Args[1];
+            var parameter3 = model.Args[2];
+            return string.Format(" DATEDIFF({0},{1},{2}) ", parameter.MemberName, parameter2.MemberName, parameter3.MemberName); ;
+        }
     }
 }
diff --git a/Src/Asp.Net/SqlSugar/ExpressionsToSql/DbMethods/IDbMethods.cs b/Src/Asp.Net/SqlSugar/ExpressionsToSql/DbMethods/IDbMethods.cs
index 2d665c03d..e7ea8d386 100644
--- a/Src/Asp.Net/SqlSugar/ExpressionsToSql/DbMethods/IDbMethods.cs
+++ b/Src/Asp.Net/SqlSugar/ExpressionsToSql/DbMethods/IDbMethods.cs
@@ -68,5 +68,9 @@ namespace SqlSugar
         string CharIndex(MethodCallExpressionModel model);
         string BitwiseAnd(MethodCallExpressionModel model);
         string BitwiseInclusiveOR(MethodCallExpressionModel model);
+
+        DateTime Oracle_ToDate(MethodCallExpressionModel model);
+        string Oracle_ToChar(MethodCallExpressionModel model);
+        int SqlServer_DateDiff(MethodCallExpressionModel model);
     }
 }
diff --git a/Src/Asp.Net/SqlSugar/ExpressionsToSql/DbMethods/SqlFunc.cs b/Src/Asp.Net/SqlSugar/ExpressionsToSql/DbMethods/SqlFunc.cs
index bab22ce28..d79102cb5 100644
--- a/Src/Asp.Net/SqlSugar/ExpressionsToSql/DbMethods/SqlFunc.cs
+++ b/Src/Asp.Net/SqlSugar/ExpressionsToSql/DbMethods/SqlFunc.cs
@@ -140,5 +140,8 @@ namespace SqlSugar
         public static int CharIndex(string findChar,string searchValue) { throw new NotSupportedException("Can only be used in expressions"); }
         public static int BitwiseAnd(int left, int right) { throw new NotSupportedException("Can only be used in expressions"); }
         public static int BitwiseInclusiveOR(int left, int right) { throw new NotSupportedException("Can only be used in expressions"); }
+        public static DateTime Oracle_ToDate(object date,string format) { throw new NotSupportedException("Can only be used in expressions"); }
+        public static string Oracle_ToChar(object date, string format) { throw new NotSupportedException("Can only be used in expressions"); }
+        public static int SqlServer_DateDiff(string dateType,DateTime date1,DateTime date2) { 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 fe47c16fc..5eb9e5e81 100644
--- a/Src/Asp.Net/SqlSugar/ExpressionsToSql/ResolveItems/MethodCallExpressionResolve.cs
+++ b/Src/Asp.Net/SqlSugar/ExpressionsToSql/ResolveItems/MethodCallExpressionResolve.cs
@@ -680,6 +680,12 @@ namespace SqlSugar
                         return this.Context.DbMehtods.BitwiseInclusiveOR(model);
                     case "ToDateShort":
                         return this.Context.DbMehtods.ToDateShort(model);
+                    case "Oracle_ToChar":
+                        return this.Context.DbMehtods.Oracle_ToChar(model);
+                    case "Oracle_ToDate":
+                        return this.Context.DbMehtods.Oracle_ToDate(model);
+                    case "SqlServer_DateDiff":
+                        return this.Context.DbMehtods.SqlServer_DateDiff(model);
                     default:
                         break;
                 }