DiscriminatorColumn (Jakarta Persistence API documentation)

```
@Target(TYPE)
@Retention(RUNTIME)
public @interface DiscriminatorColumn
```
Specifies the discriminator column for the SINGLE_TABLE and JOINED inheritance mapping strategies.
The mapping strategy and discriminator column are only specified for the root of an entity class hierarchy or subhierarchy in which a different inheritance strategy is applied.
If the DiscriminatorColumn annotation is missing, and a discriminator column is required, the name of the discriminator column defaults to "DTYPE" and the discriminator type to DiscriminatorType.STRING.
Example: {@snippet :

Since:

1.0

See Also:

DiscriminatorValue, DiscriminatorType

Optional Element Summary

Optional Elements
Modifier and Type	Optional Element	Description
`String`	`columnDefinition`	(Optional) The SQL fragment that is used when generating the DDL for the discriminator column.
`DiscriminatorType`	`discriminatorType`	(Optional) The type of object/column to use as a class discriminator.
`int`	`length`	(Optional) The column length for String-based discriminator types.
`String`	`name`	(Optional) The name of column to be used for the discriminator.
`String`	`options`	(Optional) A SQL fragment appended to the generated DDL which declares this column.

- Element Detail
  - name
```
String name
```
    (Optional) The name of column to be used for the discriminator.
    
    Default:
    
    "DTYPE"
- - discriminatorType
```
DiscriminatorType discriminatorType
```
    (Optional) The type of object/column to use as a class discriminator. Defaults to DiscriminatorType.STRING.
    
    Default:
    
    jakarta.persistence.DiscriminatorType.STRING
- - columnDefinition
```
String columnDefinition
```
    (Optional) The SQL fragment that is used when generating the DDL for the discriminator column.
    Defaults to the provider-generated SQL to create a column of the specified discriminator type.
    
    Default:
    
    ""
- - options
```
String options
```
    (Optional) A SQL fragment appended to the generated DDL which declares this column. May not be used in conjunction with columnDefinition().
    
    Since:
    
    3.2
    
    Default:
    
    ""
- - length
```
int length
```
    (Optional) The column length for String-based discriminator types. Ignored for other discriminator types.
    
    Default:
    
    31