---
title: "isNullable Method (SQLServerParameterMetaData) | Microsoft Docs"
ms.custom: ""
ms.date: "01/19/2017"
ms.prod: sql
ms.prod_service: connectivity
ms.reviewer: ""
ms.technology: connectivity
ms.topic: conceptual
apiname: 
  - "SQLServerParameterMetaData.sNullable"
apilocation: 
  - "sqljdbc.jar"
apitype: "Assembly"
ms.assetid: d7e07cff-6fc4-4c9c-8e8f-838c77734bc5
author: David-Engel
ms.author: v-daenge
---
# isNullable Method (SQLServerParameterMetaData)
[!INCLUDE[Driver_JDBC_Download](../../../includes/driver_jdbc_download.md)]

  Retrieves whether null values are allowed in the designated parameter.  
  
## Syntax  
  
```  
  
public int isNullable(int param)  
```  
  
#### Parameters  
 *param*  
  
 An **int** that indicates parameter index.  
  
## Return Value  
 An **int** that indicates the nullability of the designated parameter, which can be one of the following values:  
  
 ParameterMetaData.parameterNoNulls  
  
 ParameterMetaData.parameterNullable  
  
 ParameterMetaData.parameterNullabilityUnknown  
  
## Exceptions  
 [SQLServerException](../../../connect/jdbc/reference/sqlserverexception-class.md)  
  
## Remarks  
 This isNullable method is specified by the isNullable method in the java.sql.ParameterMetaData interface.  
  
## See Also  
 [SQLServerParameterMetaData Methods](../../../connect/jdbc/reference/sqlserverparametermetadata-methods.md)   
 [SQLServerParameterMetaData Members](../../../connect/jdbc/reference/sqlserverparametermetadata-members.md)   
 [SQLServerParameterMetaData Class](../../../connect/jdbc/reference/sqlserverparametermetadata-class.md)