From 569cd9cad26bcc9ceb789d3769eded14a726f48e Mon Sep 17 00:00:00 2001
From: Mohammadali Jalalkamali <m.ali.jalalkamali@gmail.com>
Date: Sat, 6 Dec 2025 15:48:13 +0330
Subject: [PATCH] GH-2188 - Preserve JDBCType.OTHER in string-based queries

Signed-off-by: Mohammadali Jalalkamali <m.ali.jalalkamali@gmail.com>
---
 .../query/StringBasedJdbcQuery.java           |  6 ++---
 .../query/StringBasedJdbcQueryUnitTests.java  | 26 +++++++++++++++++++
 2 files changed, 29 insertions(+), 3 deletions(-)

diff --git a/spring-data-jdbc/src/main/java/org/springframework/data/jdbc/repository/query/StringBasedJdbcQuery.java b/spring-data-jdbc/src/main/java/org/springframework/data/jdbc/repository/query/StringBasedJdbcQuery.java
index e724deeae2..da233fc365 100644
--- a/spring-data-jdbc/src/main/java/org/springframework/data/jdbc/repository/query/StringBasedJdbcQuery.java
+++ b/spring-data-jdbc/src/main/java/org/springframework/data/jdbc/repository/query/StringBasedJdbcQuery.java
@@ -261,10 +261,10 @@ private MapSqlParameterSource bindParameters(RelationalParameterAccessor accesso
 			JdbcValue jdbcValue = JdbcValueBindUtil.getBindValue(converter, value, parameter);
 			SQLType jdbcType = jdbcValue.getJdbcType();
 
-			if (jdbcType == JDBCType.OTHER) {
-				parameters.addValue(parameterName, jdbcValue.getValue());
-			} else {
+			if (jdbcType != null) {
 				parameters.addValue(parameterName, jdbcValue.getValue(), jdbcType.getVendorTypeNumber());
+			} else {
+				parameters.addValue(parameterName, jdbcValue.getValue());
 			}
 		}
 
diff --git a/spring-data-jdbc/src/test/java/org/springframework/data/jdbc/repository/query/StringBasedJdbcQueryUnitTests.java b/spring-data-jdbc/src/test/java/org/springframework/data/jdbc/repository/query/StringBasedJdbcQueryUnitTests.java
index 56e895fafd..d98621ac0f 100644
--- a/spring-data-jdbc/src/test/java/org/springframework/data/jdbc/repository/query/StringBasedJdbcQueryUnitTests.java
+++ b/spring-data-jdbc/src/test/java/org/springframework/data/jdbc/repository/query/StringBasedJdbcQueryUnitTests.java
@@ -416,6 +416,18 @@ void spelCanBeUsedInsideQueries() {
 		assertThat(paramSource.getValue().getValue("__$synthetic$__2")).isEqualTo("test-value2");
 	}
 
+	@Test // GH-2188
+	void shouldPreserveJdbcTypeOtherFromJdbcValueInStringBasedQuery() {
+
+		SqlParameterSource parameterSource = forMethod("findByCustomValue", Direction.class)
+				.withCustomConverters(DirectionToOtherJdbcTypeConverter.INSTANCE)
+				.withArguments(Direction.LEFT)
+				.extractParameterSource();
+
+		assertThat(parameterSource.getSqlType("value"))
+				.isEqualTo(JDBCType.OTHER.getVendorTypeNumber());
+	}
+
 	QueryFixture forMethod(String name, Class... paramTypes) {
 		return new QueryFixture(createMethod(name, paramTypes));
 	}
@@ -562,6 +574,9 @@ interface MyRepository extends Repository<Object, Long> {
 		@Lock(value = LockMode.PESSIMISTIC_READ)
 		@Query("SELECT * FROM person WHERE id = :id")
 		DummyEntity unsupportedWithLock(Long id);
+
+		@Query(value = "some sql statement") // GH-2188
+		List<DummyEntity> findByCustomValue(@Param("value") Direction value);
 	}
 
 	private static class CustomRowMapper implements RowMapper<Object> {
@@ -655,6 +670,17 @@ public String convert(ListContainer source) {
 		}
 	}
 
+	@WritingConverter // GH-2188
+	enum DirectionToOtherJdbcTypeConverter implements Converter<Direction, JdbcValue> {
+
+		INSTANCE;
+
+		@Override
+		public JdbcValue convert(Direction source) {
+			return JdbcValue.of(source.name(), JDBCType.OTHER);
+		}
+	}
+
 	private static class DummyEntity {
 		private final Long id;