ColumnTransformer (hibernate-core JavaDocs)

```
@Target({FIELD,METHOD})
@Retention(RUNTIME)
@Repeatable(ColumnTransformers.class)
public @interface ColumnTransformer
```
Custom SQL expression used to read the value from and write a value to a column. Use for direct object loading/saving as well as queries. The write expression must contain exactly one '?' placeholder for the value. For example: read="decrypt(credit_card_num)" write="encrypt(?)"

See Also:

ColumnTransformers

Optional Element Summary

Optional Elements
Modifier and Type	Optional Element	Description
`String`	`forColumn`	(Logical) column name for which the expression is used.
`String`	`read`	Custom SQL expression used to read from the column.
`String`	`write`	Custom SQL expression used to write to the column.

- Element Detail
  - forColumn
```
String forColumn
```
    (Logical) column name for which the expression is used. This can be left out if the property is bound to a single column
    
    Default:
    
    ""
- - read
```
String read
```
    Custom SQL expression used to read from the column.
    
    Default:
    
    ""
- - write
```
String write
```
    Custom SQL expression used to write to the column. The write expression must contain exactly one '?' placeholder for the value.
    
    Default:
    
    ""