From 428b6129bdc4bc2d95c1f0849aef8adcb8dd1de5 Mon Sep 17 00:00:00 2001
From: sunkaixuan <610262374@qq.com>
Date: Wed, 27 Mar 2024 15:00:41 +0800
Subject: [PATCH] Synchronization code

---
 .../Abstract/SugarProvider/SqlSugarAccessory.cs    | 10 ++++++++--
 .../Common/MethodCallExpressionModel.cs            |  1 +
 .../MethodCallExpressionResolve_Helper.cs          |  3 ++-
 .../SqlBuilder/PostgreSQLExpressionContext.cs      | 14 ++++++++++++++
 4 files changed, 25 insertions(+), 3 deletions(-)

diff --git a/Src/Asp.Net/SqlSugar/Abstract/SugarProvider/SqlSugarAccessory.cs b/Src/Asp.Net/SqlSugar/Abstract/SugarProvider/SqlSugarAccessory.cs
index 1b41e1009..3dae5e3a7 100644
--- a/Src/Asp.Net/SqlSugar/Abstract/SugarProvider/SqlSugarAccessory.cs
+++ b/Src/Asp.Net/SqlSugar/Abstract/SugarProvider/SqlSugarAccessory.cs
@@ -440,7 +440,10 @@ namespace SqlSugar
                     DependencyManagement.TryPostgreSQL();
                     break;
                 case DbType.OpenGauss:
-                    config.DbType = DbType.PostgreSQL; 
+                    config.DbType = DbType.PostgreSQL;
+                    if (this.CurrentConnectionConfig.MoreSettings == null)
+                        this.CurrentConnectionConfig.MoreSettings = new ConnMoreSettings();
+                    this.CurrentConnectionConfig.MoreSettings.DatabaseModel = DbType.OpenGauss;
                     break;
                 case DbType.HG:
                     InstanceFactory.CustomDllName = SugarCompatible.IsFramework ? throw new Exception("Only.NET CORE is supported") : "SqlSugar.HGCore";
@@ -489,7 +492,10 @@ namespace SqlSugar
                     InstanceFactory.CustomDllName = SugarCompatible.IsFramework ? "SqlSugar.OceanBaseForOracle" : "SqlSugar.OceanBaseForOracleCore";
                     break;
                 case DbType.GaussDB:
-                    config.DbType = DbType.PostgreSQL; 
+                    config.DbType = DbType.PostgreSQL;
+                    if (this.CurrentConnectionConfig.MoreSettings == null)
+                        this.CurrentConnectionConfig.MoreSettings = new ConnMoreSettings();
+                    this.CurrentConnectionConfig.MoreSettings.DatabaseModel = DbType.GaussDB;
                     break;
                 case DbType.Vastbase:
                     config.DbType = DbType.PostgreSQL;
diff --git a/Src/Asp.Net/SqlSugar/ExpressionsToSql/Common/MethodCallExpressionModel.cs b/Src/Asp.Net/SqlSugar/ExpressionsToSql/Common/MethodCallExpressionModel.cs
index 9bc06a4b5..093b4d39a 100644
--- a/Src/Asp.Net/SqlSugar/ExpressionsToSql/Common/MethodCallExpressionModel.cs
+++ b/Src/Asp.Net/SqlSugar/ExpressionsToSql/Common/MethodCallExpressionModel.cs
@@ -14,6 +14,7 @@ namespace SqlSugar
         public Expression Expression { get; set; }
         public Expression BaseExpression { get; set; }
         public List<SugarParameter> Parameters { get;  set; }
+        public ExpressionContext Conext { get;  set; }
     }
 
     public class MethodCallExpressionArgs
diff --git a/Src/Asp.Net/SqlSugar/ExpressionsToSql/ResolveItems/MethodCallExpressionResolve_Helper.cs b/Src/Asp.Net/SqlSugar/ExpressionsToSql/ResolveItems/MethodCallExpressionResolve_Helper.cs
index 4faf57b11..ce23060fd 100644
--- a/Src/Asp.Net/SqlSugar/ExpressionsToSql/ResolveItems/MethodCallExpressionResolve_Helper.cs
+++ b/Src/Asp.Net/SqlSugar/ExpressionsToSql/ResolveItems/MethodCallExpressionResolve_Helper.cs
@@ -662,7 +662,8 @@ namespace SqlSugar
                         return this.Context.DbMehtods.HasNumber(model);
                     case "HasValue":
                         return this.Context.DbMehtods.HasValue(model);
-                    case "IsNullOrEmpty":
+                    case "IsNullOrEmpty": 
+                        model.Conext = this.Context;
                         return this.Context.DbMehtods.IsNullOrEmpty(model);
                     case "ToLower":
                         return this.Context.DbMehtods.ToLower(model);
diff --git a/Src/Asp.Net/SqlSugar/Realization/PostgreSQL/SqlBuilder/PostgreSQLExpressionContext.cs b/Src/Asp.Net/SqlSugar/Realization/PostgreSQL/SqlBuilder/PostgreSQLExpressionContext.cs
index 71b6d0d8f..eec975182 100644
--- a/Src/Asp.Net/SqlSugar/Realization/PostgreSQL/SqlBuilder/PostgreSQLExpressionContext.cs
+++ b/Src/Asp.Net/SqlSugar/Realization/PostgreSQL/SqlBuilder/PostgreSQLExpressionContext.cs
@@ -373,6 +373,20 @@ namespace SqlSugar
             var parameter = model.Args[0];
             return string.Format(" LENGTH({0})", parameter.MemberName);
         }
+        public override string IsNullOrEmpty(MethodCallExpressionModel model)
+        {
+            if (model.Conext?.SugarContext?.Context?.CurrentConnectionConfig?.MoreSettings?.DatabaseModel == DbType.OpenGauss ||
+                model.Conext?.SugarContext?.Context?.CurrentConnectionConfig?.MoreSettings?.DatabaseModel == DbType.Vastbase||
+                model.Conext?.SugarContext?.Context?.CurrentConnectionConfig?.MoreSettings?.DatabaseModel == DbType.GaussDB)
+            {
+                var parameter = model.Args[0];
+                return string.Format("( {0} IS NULL )", parameter.MemberName);
+            }
+            else
+            {
+                return base.IsNullOrEmpty(model);
+            }
+        }
         public override string MergeString(params string[] strings)
         {
             var key = Guid.NewGuid() + "";