diff --git a/chat2db-server/chat2db-plugins/chat2db-oracle/src/main/java/ai/chat2db/plugin/oracle/value/sub/OracleLongRawProcessor.java b/chat2db-server/chat2db-plugins/chat2db-oracle/src/main/java/ai/chat2db/plugin/oracle/value/sub/OracleLongRawProcessor.java
index 2d030319..6f3634c1 100644
--- a/chat2db-server/chat2db-plugins/chat2db-oracle/src/main/java/ai/chat2db/plugin/oracle/value/sub/OracleLongRawProcessor.java
+++ b/chat2db-server/chat2db-plugins/chat2db-oracle/src/main/java/ai/chat2db/plugin/oracle/value/sub/OracleLongRawProcessor.java
@@ -5,6 +5,8 @@ import ai.chat2db.spi.jdbc.DefaultValueProcessor;
 import ai.chat2db.spi.model.JDBCDataValue;
 import ai.chat2db.spi.model.SQLDataValue;
 
+import java.util.Objects;
+
 /**
  * @author: zgq
  * @date: 2024年07月07日 16:58
@@ -25,7 +27,11 @@ public class OracleLongRawProcessor extends DefaultValueProcessor {
 
     @Override
     public String convertJDBCValueStrByType(JDBCDataValue dataValue) {
-        return EasyStringUtils.quoteString(dataValue.getBlobHexString());
+        String blobHexString = dataValue.getBlobHexString();
+        if (Objects.isNull(blobHexString)) {
+            return "NULL";
+        }
+        return EasyStringUtils.quoteString(blobHexString);
     }
 
 }
diff --git a/chat2db-server/chat2db-spi/src/main/java/ai/chat2db/spi/model/JDBCDataValue.java b/chat2db-server/chat2db-spi/src/main/java/ai/chat2db/spi/model/JDBCDataValue.java
index 8ff42015..685b3308 100644
--- a/chat2db-server/chat2db-spi/src/main/java/ai/chat2db/spi/model/JDBCDataValue.java
+++ b/chat2db-server/chat2db-spi/src/main/java/ai/chat2db/spi/model/JDBCDataValue.java
@@ -97,7 +97,7 @@ public class JDBCDataValue {
     public String getBlobHexString() {
         byte[] bytes = getBytes();
         if (Objects.isNull(bytes)) {
-            return "NULL";
+            return null;
         }
         return BaseEncoding.base16().encode(bytes);
     }