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| 1. Attribute converter used to create custom values in db like gender values m, f | |
| 2. @CreationTimestamp attribute | |
| a. please make sure the Date vairable should be imported from java.util.date | |
| b. used for createAt attribute | |
| 3. @UpdateTimestamp attribute | |
| a. please make sure the Date vairable should be imported from java.util.date | |
| b. used for updateAt attribute | |
| 4. @ColumnTransformer allows you to customize the SQL it uses to read and write the values of columns mapped to @Basic types | |
| 4. @Formula do some computation for you rather than in the JVM |
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