Myabtis_ Plus

One . Auto fill

1. preparation Add new fields create_time,update_time.
2. Add annotations to the fields that need to be automatically filled in the entity class

@TableField(fill = FieldFill.INSERT)
private Date createTime;

@TableFileld(fill = FileldFill.INSERT_UPDATE)
private Date uodateTime;

Optimism lock

What is an optimistic lock ：
Is a solution to a problem ：

Missing update problem . Zhang San , Li Si changed his salary at the same time . Zhang San changed his salary to 9000, The normal situation should be general Li Si 9000 Change your salary to 100, Rather than 5000 Change it to 100.
add to version Version number . The version number changes after the update . If another person's version number is inconsistent, he cannot submit .

1. Add fields to the table version

2. Add... To the entity class attribute @Version annotation

@Version
private Integer version;

3. Register optimistic lock plugin
   stay MybatisPlusConfig Register in Bean

@Configuration
@MapperScan("com.janson.mybatis_plus.mapper")
public class MybatisPlusConfig {
    
/** * Optimistic lock plug-in  **/
   @Bean
    public OptimisticLockerInterceptor optimisticLockerInterceptor() {
    
        return new OptimisticLockerInterceptor();
    }
 }