Hibernate双向关联插入数据时候的怪问题
简单描述一下表结构：主表Team，从表Player，建立外键关联。以下是HBM文件：
Team：<hibernate-mapping></hibernate-mapping>
Transaction tx = session.beginTransaction();
for(int i=0;i<2;i++) {
Team team = new Team();
team.setId("Team" + new Integer(i).toString());
team.setName(team.getId());
Set
<player></player>
players = new HashSet
<player></player>
();
for(int j=0;j<10;j++) {
Player player = new Player();
player.setId("Player" + team.getId()+"."+new Integer(j).toString());
player.setName(player.getId());
player.setBirthday(new Date());
player.setGender(true);
player.setTeam(team);
players.add(player);
}
team.setPlayers(players);
session.save(team);
}
tx.commit(); 执行代码，SQL打印如下：
Hibernate: select player_.id, player_.team as team1_, player_.name as name1_, player_.gender as gender1_, player_.birthday as birthday1_ from hibernatedemo.player player_ where player_.id=?
Hibernate:selectplayer_.id,player_.teamasteam1_,player_.nameasname1_,player_.genderasgender1_,player_.birthdayasbirthday1_fromhibernatedemo.playerplayer_whereplayer_.id=?
Hibernate:selectplayer_.id,player_.teamasteam1_,player_.nameasname1_,player_.genderasgender1_,player_.birthdayasbirthday1_fromhibernatedemo.playerplayer_whereplayer_.id=?
Hibernate:selectplayer_.id,player_.teamasteam1_,player_.nameasname1_,player_.genderasgender1_,player_.birthdayasbirthday1_fromhibernatedemo.playerplayer_whereplayer_.id=?
Hibernate:selectplayer_.id,player_.teamasteam1_,player_.nameasname1_,player_.genderasgender1_,player_.birthdayasbirthday1_fromhibernatedemo.playerplayer_whereplayer_.id=?
Hibernate:selectplayer_.id,player_.teamasteam1_,player_.nameasname1_,player_.genderasgender1_,player_.birthdayasbirthday1_fromhibernatedemo.playerplayer_whereplayer_.id=?
Hibernate:selectplayer_.id,player_.teamasteam1_,player_.nameasname1_,player_.genderasgender1_,player_.birthdayasbirthday1_fromhibernatedemo.playerplayer_whereplayer_.id=?
Hibernate:selectplayer_.id,player_.teamasteam1_,player_.nameasname1_,player_.genderasgender1_,player_.birthdayasbirthday1_fromhibernatedemo.playerplayer_whereplayer_.id=?
Hibernate:selectplayer_.id,player_.teamasteam1_,player_.nameasname1_,player_.genderasgender1_,player_.birthdayasbirthday1_fromhibernatedemo.playerplayer_whereplayer_.id=?
Hibernate:selectplayer_.id,player_.teamasteam1_,player_.nameasname1_,player_.genderasgender1_,player_.birthdayasbirthday1_fromhibernatedemo.playerplayer_whereplayer_.id=?
Hibernate:selectplayer_.id,player_.teamasteam1_,player_.nameasname1_,player_.genderasgender1_,player_.birthdayasbirthday1_fromhibernatedemo.playerplayer_whereplayer_.id=?
Hibernate:selectplayer_.id,player_.teamasteam1_,player_.nameasname1_,player_.genderasgender1_,player_.birthdayasbirthday1_fromhibernatedemo.playerplayer_whereplayer_.id=?
Hibernate:selectplayer_.id,player_.teamasteam1_,player_.nameasname1_,player_.genderasgender1_,player_.birthdayasbirthday1_fromhibernatedemo.playerplayer_whereplayer_.id=?
Hibernate:selectplayer_.id,player_.teamasteam1_,player_.nameasname1_,player_.genderasgender1_,player_.birthdayasbirthday1_fromhibernatedemo.playerplayer_whereplayer_.id=?
Hibernate:selectplayer_.id,player_.teamasteam1_,player_.nameasname1_,player_.genderasgender1_,player_.birthdayasbirthday1_fromhibernatedemo.playerplayer_whereplayer_.id=?
Hibernate:selectplayer_.id,player_.teamasteam1_,player_.nameasname1_,player_.genderasgender1_,player_.birthdayasbirthday1_fromhibernatedemo.playerplayer_whereplayer_.id=?
Hibernate:selectplayer_.id,player_.teamasteam1_,player_.nameasname1_,player_.genderasgender1_,player_.birthdayasbirthday1_fromhibernatedemo.playerplayer_whereplayer_.id=?
Hibernate:selectplayer_.id,player_.teamasteam1_,player_.nameasname1_,player_.genderasgender1_,player_.birthdayasbirthday1_fromhibernatedemo.playerplayer_whereplayer_.id=?
Hibernate:selectplayer_.id,player_.teamasteam1_,player_.nameasname1_,player_.genderasgender1_,player_.birthdayasbirthday1_fromhibernatedemo.playerplayer_whereplayer_.id=?
Hibernate:selectplayer_.id,player_.teamasteam1_,player_.nameasname1_,player_.genderasgender1_,player_.birthdayasbirthday1_fromhibernatedemo.playerplayer_whereplayer_.id=?
Hibernate:insertintohibernatedemo.team(name,id)values(?,?)
Hibernate:insertintohibernatedemo.player(team,name,gender,birthday,id)values(?,?,?,?,?)
Hibernate:insertintohibernatedemo.player(team,name,gender,birthday,id)values(?,?,?,?,?)
Hibernate:insertintohibernatedemo.player(team,name,gender,birthday,id)values(?,?,?,?,?)
Hibernate:insertintohibernatedemo.player(team,name,gender,birthday,id)values(?,?,?,?,?)
Hibernate:insertintohibernatedemo.player(team,name,gender,birthday,id)values(?,?,?,?,?)
Hibernate:insertintohibernatedemo.player(team,name,gender,birthday,id)values(?,?,?,?,?)
Hibernate:insertintohibernatedemo.player(team,name,gender,birthday,id)values(?,?,?,?,?)
Hibernate:insertintohibernatedemo.player(team,name,gender,birthday,id)values(?,?,?,?,?)
Hibernate:insertintohibernatedemo.player(team,name,gender,birthday,id)values(?,?,?,?,?)
Hibernate:insertintohibernatedemo.player(team,name,gender,birthday,id)values(?,?,?,?,?)
Hibernate:insertintohibernatedemo.team(name,id)values(?,?)
Hibernate:insertintohibernatedemo.player(team,name,gender,birthday,id)values(?,?,?,?,?)
Hibernate:insertintohibernatedemo.player(team,name,gender,birthday,id)values(?,?,?,?,?)
Hibernate:insertintohibernatedemo.player(team,name,gender,birthday,id)values(?,?,?,?,?)
Hibernate:insertintohibernatedemo.player(team,name,gender,birthday,id)values(?,?,?,?,?)
Hibernate:insertintohibernatedemo.player(team,name,gender,birthday,id)values(?,?,?,?,?)
Hibernate:insertintohibernatedemo.player(team,name,gender,birthday,id)values(?,?,?,?,?)
Hibernate:insertintohibernatedemo.player(team,name,gender,birthday,id)values(?,?,?,?,?)
Hibernate:insertintohibernatedemo.player(team,name,gender,birthday,id)values(?,?,?,?,?)
Hibernate:insertintohibernatedemo.player(team,name,gender,birthday,id)values(?,?,?,?,?)
Hibernate: insert into hibernatedemo.player (team, name, gender, birthday, id) values (?, ?, ?, ?, ?)问题是：为什么在insert语句之前，会执行select语句，对player进行查询呢？请指教