Java Annotations Metabase table primary key

One

Number Type Integer

@Id @generatedvalue (Strategy=generationtype.identity)

The primary key type of hibernate-generated table after running is the integer type

--------------------------------------------------------------------------------------------------------------- --------------------------------

--------------------------------------------------------------------------------------------------------------- --------------------------------

--------------------------------------------------------------------------------------------------------------- --------------------------------

In addition to being able to configure a generationtype.identity, there is another one. AUTO, which is common to all databases

But there will be a sequence sequence table that does little, sequence is in the Oracle database, but sequence in Oracle is not a table, it's an object

@Id @generatedvalue (Strategy=generationtype.auto)

Two

string-type String

uuid,{Unique identifier, world-wide unique}

@Id @generatedvalue (Generator= "Systemuuid") @GenericGenerator (name= "Systemuuid", strategy= "uuid ")

When new data is added, the primary key field value is just a string of strings,

According to the data when the information is entered and the device information of the equipment used, etc., it is called the world's unique identity

Three

Oracle_sequence of number types

Java Annotations Metabase table primary key