Merge pull request #6 from DUWENINK/main

在GaussDB3.1.1针对默认的escape '' 无法正确查询出问题,此处应该根据GaussDB进行适配以符合自然状态

Author: wangpengxpy

src/EFCore.GaussDB/EFCore.GaussDB.sln

@@ -0,0 +1,24 @@
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.5.2.0
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "EFCore.GaussDB", "EFCore.GaussDB.csproj", "{924146F9-3761-F4BC-A4E0-FE7DACE64CE5}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{924146F9-3761-F4BC-A4E0-FE7DACE64CE5}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{924146F9-3761-F4BC-A4E0-FE7DACE64CE5}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{924146F9-3761-F4BC-A4E0-FE7DACE64CE5}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{924146F9-3761-F4BC-A4E0-FE7DACE64CE5}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {60C36C95-C272-4C83-A7BD-FE20BF4DE337}
+	EndGlobalSection
+EndGlobal

src/EFCore.GaussDB/Query/ExpressionTranslators/Internal/GaussDBLikeTranslator.cs

@@ -78,16 +78,14 @@ public GaussDBLikeTranslator(GaussDBSqlExpressionFactory sqlExpressionFactory)
 
         var (match, pattern) = (arguments[1], arguments[2]);
 
-        if (pattern is SqlConstantExpression { Value: string patternValue }
-            && !patternValue.Contains('\\'))
+        return pattern switch
         {
-            return sensitive
-                ? _sqlExpressionFactory.Like(match, pattern)
-                : _sqlExpressionFactory.ILike(match, pattern);
-        }
-
-        return sensitive
-            ? _sqlExpressionFactory.Like(match, pattern, _sqlExpressionFactory.Constant(string.Empty))
-            : _sqlExpressionFactory.ILike(match, pattern, _sqlExpressionFactory.Constant(string.Empty));
+            SqlConstantExpression { Value: string patternValue } when !patternValue.Contains('\\') => sensitive
+                ? _sqlExpressionFactory.Like(match, pattern, _sqlExpressionFactory.Constant("\\"))
+                : _sqlExpressionFactory.ILike(match, pattern, _sqlExpressionFactory.Constant("\\")),
+            _ => sensitive
+            ? _sqlExpressionFactory.Like(match, pattern, _sqlExpressionFactory.Constant("\\"))
+            : _sqlExpressionFactory.ILike(match, pattern, _sqlExpressionFactory.Constant("\\"))
+        };
     }
 }