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Hibernate集合排序之?dāng)?shù)據(jù)庫(kù)排序

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使用order-by屬性,我們可以通過hbm文件執(zhí)行生成的SQL如何使用order by 查詢子句以返回排序后的結(jié)果集

數(shù)據(jù)庫(kù)結(jié)構(gòu):

?

create ? table ?teamOrder?(id? varchar ( 32 ),teamname? varchar ( 32 ));
create ? table ?studentOrder?(id? varchar ( 32 ),name? varchar ( 32 ),description? varchar ( 32 ),team_id? varchar ( 32 ));
insert ? into ?teamOrder? values (" 1 ","team1");
insert ? into ?studentOrder? values (" 1 ","a","a"," 1 ");
insert ? into ?studentOrder? values (" 2 ","b","b"," 1 ");
insert ? into ?studentOrder? values (" 3 ","c","c"," 1 ");

?

pojo:

?

package ?Collection.Order;

import ?java.util.Set;

public ? class ?Team? ... {
???
private ?String?id;
???
private ?String?teamname;
???
private ?Set?students;
public ?String?getId()? ... {
????
return ?id;
}

public ? void ?setId(String?id)? ... {
????
this .id? = ?id;
}

public ?String?getTeamname()? ... {
????
return ?teamname;
}

public ? void ?setTeamname(String?teamname)? ... {
????
this .teamname? = ?teamname;
}

public ?Set?getStudents()? ... {
????
return ?students;
}

public ? void ?setStudents(Set?students)? ... {
????
this .students? = ?students;
}


}




package ?Collection.Order;

public ? class ?Student? ... {
??
private ?String?id;
??
private ?String?name;
??
private ?String?description;
??
private ?Team?team;
public ?String?getId()? ... {
????
return ?id;
}

public ? void ?setId(String?id)? ... {
????
this .id? = ?id;
}

public ?String?getName()? ... {
????
return ?name;
}

public ? void ?setName(String?name)? ... {
????
this .name? = ?name;
}

public ?String?getDescription()? ... {
????
return ?description;
}

public ? void ?setDescription(String?description)? ... {
????
this .description? = ?description;
}


public ?Team?getTeam()? ... {
????
return ?team;
}

public ? void ?setTeam(Team?team)? ... {
????
this .team? = ?team;
}

}

?

Hibernate.cfg.xml

?

<? xml?version='1.0'?encoding='UTF-8' ?>
<! DOCTYPE?hibernate-configuration?PUBLIC
??????????"-//Hibernate/Hibernate?Configuration?DTD?3.0//EN"
??????????"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"
>

<!-- ?Generated?by?MyEclipse?Hibernate?Tools.??????????????????? -->
< hibernate-configuration >

< session-factory >
????
< property? name ="connection.username" > root </ property >
????
< property? name ="connection.url" >
????????jdbc:mysql://localhost:3306/schoolproject?characterEncoding=gb2312
&amp; useUnicode=true
????
</ property >
????
< property? name ="dialect" >
????????org.hibernate.dialect.MySQLDialect
????
</ property >
????
< property? name ="myeclipse.connection.profile" > mysql </ property >
????
< property? name ="connection.password" > 1234 </ property >
????
< property? name ="connection.driver_class" >
????????com.mysql.jdbc.Driver
????
</ property >
????
< property? name ="hibernate.dialect" >
????????org.hibernate.dialect.MySQLDialect
????
</ property >
????
< property? name ="hibernate.show_sql" > true </ property >
????
< property? name ="current_session_context_class" > thread </ property >
????
< property? name ="jdbc.batch_size" > 15 </ property >
????
< mapping? resource ="Collection/Order/Student.hbm.xml" ? />
????
< mapping? resource ="Collection/Order/Team.hbm.xml" ? />




</ session-factory >

</ hibernate-configuration >

Student.hbm.xml

?

<? xml?version="1.0"?encoding="utf-8" ?>
<! DOCTYPE?hibernate-mapping?PUBLIC?"-//Hibernate/Hibernate?Mapping?DTD?3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"
>
<!-- ?
????Mapping?file?autogenerated?by?MyEclipse?-?Hibernate?Tools
-->
< hibernate-mapping >
< class? name ="Collection.Order.Student" ?table ="studentOrder" ? >
????
< id? name ="id" ?unsaved-value ="null" >
??????
< generator? class ="uuid.hex" ></ generator >
????
</ id >
??
????
< property? name ="name" ?type ="string" ?column ="name" ></ property >
???
????
< property? name ="description" ?type ="string" ?column ="description" ></ property > ?
????
< many-to-one? name ="team" ?
?????????????????column
="team_id"
?????????????????class
="Collection.Order.Team" ?
?????????????????cascade
="none" ?
?????????????????fetch
="join" >
????
</ many-to-one >
</ class >

</ hibernate-mapping >

Team.hbm.xml

?

?

<? xml?version="1.0"?encoding="utf-8" ?>
<! DOCTYPE?hibernate-mapping?PUBLIC?"-//Hibernate/Hibernate?Mapping?DTD?3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"
>
<!-- ?
????Mapping?file?autogenerated?by?MyEclipse?-?Hibernate?Tools
-->
< hibernate-mapping >
< class? name ="Collection.Order.Team" ?table ="teamOrder" ? >
????
< id? name ="id" ?unsaved-value ="null" >
??????
< generator? class ="uuid.hex" ></ generator >
????
</ id >
????
< property? name ="teamname" ?type ="string" ?column ="teamname" ></ property >
????
<!-- ?以名稱降序返回student集合? -->
????
< set? name ="students" ?table ="studentOrder" ?cascade ="all" ?order-by ="name?desc" >
??????
< key? column ="team_id" ></ key >
??????
< one-to-many? class ="Collection.Order.Student" />
????
</ set >
</ class >

</ hibernate-mapping >

?

測(cè)試代碼:

?

package ?Collection.Order;


import ?java.io.File;
import ?java.util.Iterator;
import ?java.util.Set;

import ?org.hibernate.Session;
import ?org.hibernate.SessionFactory;
import ?org.hibernate.Transaction;
import ?org.hibernate.cfg.Configuration;

Hibernate集合排序之?dāng)?shù)據(jù)庫(kù)排序


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