详解SpringBoot Mongo 自增长ID有序规则

概述：本文主要介绍springboot基于mongodb有序id生成，如生成工单编号gd202109290001。单机情况下效率每秒生成5000个有序id。

实现方式如下

maven

<dependencies>
    <dependency>
        <groupid>org.springframework.boot</groupid>
        <artifactid>spring-boot-starter-web</artifactid>
    </dependency>
    <dependency>
        <groupid>org.springframework.boot</groupid>
        <artifactid>spring-boot-starter-data-mongodb</artifactid>
    </dependency>
    <dependency>
        <groupid>org.springframework.boot</groupid>
        <artifactid>spring-boot-starter-test</artifactid>
        <scope>test</scope>
    </dependency>
</dependencies>

代码编写

@document
@data
public class incr {

    @id
    private string id;

    private string collectionname;

    private long incrid;
}

@service
public class incrservice {

    @autowired
    private mongotemplate mongotemplate;

    /**
     * 获取自增id
     * @param collectionname
     * @return
     */
    public long getincrid(string collectionname){
        query query = new query(criteria.where("collectionname").is(collectionname));
        update update = new update();
        update.inc("incrid");
        findandmodifyoptions options = findandmodifyoptions.options();
        options.upsert(true);
        options.returnnew(true);
        incr incr = mongotemplate.findandmodify(query,update,options,incr.class);
        return incr.getincrid();
    }

}

@restcontroller
@requestmapping(value = "incr")
public class incrcontroller {

    @autowired
    private incrservice incrservice;

    @requestmapping(value = "test")
    public object test(){
        long start = system.currenttimemillis();
        list<string> aas = new arraylist<>();
        for (int i=0;i<10000;i++){
            aas.add(i+"");
        }
        int i = 0;
        aas.parallelstream().foreach(aa -> {
            incrservice.getincrid(aa+"");
        });
        system.out.println(system.currenttimemillis()-start);
        return true;
    }
}

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