Update MySql DoesColumnExist to handle quoted tables

Author: mythz

src/ServiceStack.OrmLite.MySql/MySqlDialectProviderBase.cs

@@ -437,7 +437,7 @@ public override async Task<bool> DoesTableExistAsync(IDbCommand dbCmd, string ta
 
         public override bool DoesColumnExist(IDbConnection db, string columnName, string tableName, string schema = null)
         {
-	        tableName = GetTableName(tableName, schema);
+	        tableName = GetTableName(tableName, schema).StripQuotes();
 	        var sql = "SELECT COUNT(*) FROM INFORMATION_SCHEMA.COLUMNS"
 	                  + " WHERE TABLE_NAME = @tableName AND COLUMN_NAME = @columnName AND TABLE_SCHEMA = @schema"
 		                  .SqlFmt(GetTableName(tableName, schema).StripDbQuotes(), columnName);
@@ -449,7 +449,7 @@ public override bool DoesColumnExist(IDbConnection db, string columnName, string
 
         public override async Task<bool> DoesColumnExistAsync(IDbConnection db, string columnName, string tableName, string schema = null, CancellationToken token=default)
         {
-	        tableName = GetTableName(tableName, schema);
+	        tableName = GetTableName(tableName, schema).StripQuotes();
 	        var sql = "SELECT COUNT(*) FROM INFORMATION_SCHEMA.COLUMNS"
 	                  + " WHERE TABLE_NAME = @tableName AND COLUMN_NAME = @columnName AND TABLE_SCHEMA = @schema"
 		                  .SqlFmt(GetTableName(tableName, schema).StripDbQuotes(), columnName);

tests/ServiceStack.OrmLite.MySql.Tests/OrmLiteCreateTableTests.cs

@@ -140,5 +140,25 @@ public void Can_create_ModelWithIdAndName_table_with_specified_DefaultStringLeng
             Console.WriteLine("createTableSql: " + createTableSql);
             Assert.That(createTableSql.Contains("VARCHAR(255)"), Is.True);
         }
+
+        public class Signal
+        {
+            [AutoIncrement]
+            public int Id { get; set; }
+            public short Code { get; set; }
+        }
+
+        [Test]
+        public void Does_DoesColumnExist()
+        {
+            using var db = OpenDbConnection();
+            db.DropTable<Signal>();
+            var exists = db.ColumnExists<Signal>(x => x.Code);
+            Assert.That(exists, Is.False);
+
+            db.CreateTable<Signal>();
+            exists = db.ColumnExists<Signal>(x => x.Code);
+            Assert.That(exists);
+        }
     }
 }