| Modifier and Type | Class and Description | 
|---|---|
| class  | R2dbcBadGrammarExceptionException thrown when the SQL statement has a problem in its syntax. | 
| class  | R2dbcDataIntegrityViolationExceptionException thrown when an attempt to insert or update data results in a violation of an integrity constraint. | 
| class  | R2dbcNonTransientResourceExceptionException thrown when a resource fails completely and the failure is permanent. | 
| class  | R2dbcPermissionDeniedExceptionException thrown when the underlying resource denied a permission to access a specific element, such as a specific
 database table. | 
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