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This article mainly introduces how to solve the problem that @ Table annotations can not be used. It has a certain reference value. Interested friends can refer to it. I hope you will learn a lot after reading this article. Let the editor take you to know it.

@ Table annotations cannot be used and report red

When I want to serialize directly when creating a new entity class, I encounter the problem that annotations don't work, and later I find that there is a lack of a dependency, which is really speechless.

@ Table (name = "tb_user") public class User implements Serializable {private static final long serialVersionUID=1L; @ Id @ GeneratedValue (strategy = GenerationType.IDENTITY) private Long id

Add the following dependency to the pom.xml file and you're done.

Javax.persistence persistence-api @ Table annotations detailed annotations spring @ Table annotations are

Declares that this object is mapped to the database's data table, through which you can specify a table (talbe) for the entity

Two commonly used attributes

1. Name is used to name the database table corresponding to the current entity class.

@ Table (name = "tab_user")

2. UniqueConstraints is used to name unique keys in batch.

Its function is equivalent to multiple: @ Column (unique = true)

Table (name = "tab_user", uniqueConstraints = {@ UniqueConstraint (columnNames= {"uid", "email"})})

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