java - Auto Increment like with String values in hibernate -

well want know if there appropriate way tackle generating auto id string values, first idea creating auto increment id can call auto_id before saving new entity i'll query latest data inside db id i'll add 1 auto generate value column assign name stringvalue+(id+1) though i'm concerned on how affect performance saving entity needs 2 access in db fetching , saving... question earlier there appropriate way handle scenario?

and sorry english guys if want clarify things question kindly ask, thnx in advance..

here's code attributemodel hibernate annotation

@component @entity @table(name="attribute_info") public class attributemodel {     @id     @generatedvalue(strategy=generationtype.auto)     @column(name="attr_id", nullable=false, unique=true)     private int id;      @column(name="attr_name")     private string name;      @column(name="attr_desc")     private string desc;      @column(name="attr_active")     private int active;      @column(name="attr_abbr")     private string abbr;      @onetoone(cascade = cascadetype.all, fetch = fetchtype.eager)     @joincolumn(name="stats_id", referencedcolumnname="stats_id")     private basestatisticmodel basestats;      public string getname() {         return name;     }      public void setname(string name) {         this.name = name;     }      public string getdesc() {         return desc;     }      public void setdesc(string desc) {         this.desc = desc;     }      public int getactive() {         return active;     }      public void setactive(int active) {         this.active = active;     }      public string getabbr() {         return abbr;     }      public void setabbr(string abbr) {         this.abbr = abbr;     }      public basestatisticmodel getbasestats() {         return basestats;     }      public void setbasestats(basestatisticmodel basestats) {         this.basestats = basestats;     }      public int getid() {         return id;     }      public void setid(int id) {         this.id = id;     }     } 

i can "don't it". how string id "str10001" better 10001? can't optimization strings take more memory , more time. guess need pass string-expecting method later.

if so, pass "str" + id instead. constructing string on fly surely won't saturate server.

if not, let know you need rather think achieve it.

i'm pretty sure, hibernate can't it. couldn't long time ago checked , makes no sense (in case, it's not feature crowds request).