From 86abe7fd4fdbcc4d4342498ff0f1e59a35d1fb84 Mon Sep 17 00:00:00 2001
From: Chris Cranford <chris@hibernate.org>
Date: Thu, 19 Jul 2018 09:54:02 -0400
Subject: [PATCH] HHH-12753 - Fix Nationalized CLOB test failures on DB2. Force
 column read/write to use non-nationalized driver methods since the driver
 does not implement the nationalized equivalents.

(cherry picked from commit 005d5b7c748c4c03afddae43a6fc2299869ab0f9)
---
 .../org/hibernate/dialect/DB297Dialect.java   | 42 +++++++++++++++++--
 1 file changed, 39 insertions(+), 3 deletions(-)

diff --git a/hibernate-core/src/main/java/org/hibernate/dialect/DB297Dialect.java b/hibernate-core/src/main/java/org/hibernate/dialect/DB297Dialect.java
index 314f1eba2d..44730c84c6 100644
--- a/hibernate-core/src/main/java/org/hibernate/dialect/DB297Dialect.java
+++ b/hibernate-core/src/main/java/org/hibernate/dialect/DB297Dialect.java
@@ -6,14 +6,17 @@
  */
 package org.hibernate.dialect;
 
+import java.sql.Types;
+
 import org.hibernate.dialect.function.DB2SubstringFunction;
-import org.hibernate.dialect.function.StandardSQLFunction;
 import org.hibernate.hql.spi.id.IdTableSupportStandardImpl;
 import org.hibernate.hql.spi.id.MultiTableBulkIdStrategy;
 import org.hibernate.hql.spi.id.global.GlobalTemporaryTableBulkIdStrategy;
 import org.hibernate.hql.spi.id.local.AfterUseAction;
-import org.hibernate.hql.spi.id.local.LocalTemporaryTableBulkIdStrategy;
-import org.hibernate.type.StandardBasicTypes;
+import org.hibernate.type.descriptor.sql.CharTypeDescriptor;
+import org.hibernate.type.descriptor.sql.ClobTypeDescriptor;
+import org.hibernate.type.descriptor.sql.SqlTypeDescriptor;
+import org.hibernate.type.descriptor.sql.VarcharTypeDescriptor;
 
 /**
  * An SQL dialect for DB2 9.7.
@@ -57,4 +60,37 @@ public class DB297Dialect extends DB2Dialect {
 				AfterUseAction.CLEAN
 		);
 	}
+
+	@Override
+	protected SqlTypeDescriptor getSqlTypeDescriptorOverride(int sqlCode) {
+		// See HHH-12753
+		// It seems that DB2's JDBC 4.0 support as of 9.5 does not support the N-variant methods like
+		// NClob or NString.  Therefore here we overwrite the sql type descriptors to use the non-N variants
+		// which are supported.
+		switch ( sqlCode ) {
+			case Types.NCHAR:
+				return CharTypeDescriptor.INSTANCE;
+
+			case Types.NCLOB:
+				if ( useInputStreamToInsertBlob() ) {
+					return ClobTypeDescriptor.STREAM_BINDING;
+				}
+				else {
+					return ClobTypeDescriptor.CLOB_BINDING;
+				}
+
+			case Types.NVARCHAR:
+				return VarcharTypeDescriptor.INSTANCE;
+
+			default:
+				return super.getSqlTypeDescriptorOverride( sqlCode );
+		}
+	}
+
+	@Override
+	public boolean canCreateSchema() {
+		// this seems to only be a problem in QE where schema management is disabled.
+		// should we keep this?
+		return false;
+	}
 }