Primary key Generator

1.1 Identity

Description

1. The table must support the automatic growth mechanism

2. Database Generation PRIMARY Key

3, do not need to set the primary key in the program

1.2 Assigned

Description

The value must be given in the program's Way.

PID is assigned in the program, and is used in the development environment and test environment.

1.3 Increment

Description

1. If you choose how the primary key is generated, you must be a numeric type

2, first get the maximum value of the primary key, add 1 on the basis of the maximum value, form a new primary key

3, to achieve the increased operation:

4. Low efficiency

5, the generation of the primary key is implemented by hibernate internal

1.4 Native

Different build strategies are selected based on the tables of the different databases

1.5 Uuid

Description

1. The primary key must be a varchar type

2, the primary key is generated by hibernate internally

3. Must be a string type in the Persistence class

No settings are required in the program

Primary key Generator