From 2bdeaff849f4b9f012b6098b74f6c6082c1b8f5d Mon Sep 17 00:00:00 2001
From: cliu <laujie1983@126.com>
Date: Fri, 12 Sep 2025 15:45:54 +0800
Subject: [PATCH] fix(data/odbc): change the preparing of uuid column type so
 that isNull() can properly get the actual size and check if it is null.

---
 Data/ODBC/include/Poco/Data/ODBC/Preparator.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Data/ODBC/include/Poco/Data/ODBC/Preparator.h b/Data/ODBC/include/Poco/Data/ODBC/Preparator.h
index 7030ab0bd..07b9ba428 100644
--- a/Data/ODBC/include/Poco/Data/ODBC/Preparator.h
+++ b/Data/ODBC/include/Poco/Data/ODBC/Preparator.h
@@ -554,7 +554,7 @@ private:
 
 			case MetaColumn::FDT_UUID:
 				if (pVal)
-					return prepareFixedSize<Poco::UUID>(pos, SQL_C_BINARY, 16);
+					return prepareFixedSize<Poco::UUID>(pos, SQL_C_BINARY, pVal->size());
 				else
 					return prepareFixedSize<Poco::UUID>(pos, SQL_C_BINARY);
 
@@ -1185,7 +1185,7 @@ inline void Preparator::prepare(std::size_t pos, const std::list<Poco::DateTime>
 
 inline void Preparator::prepare(std::size_t pos, const Poco::UUID&)
 {
-	prepareCharArray<char, DT_CHAR_ARRAY>(pos, SQL_C_BINARY, 16, 16);
+	prepareVariableLen<char>(pos, SQL_C_BINARY, 16, DT_CHAR);
 }