九乡新闻网肾炎患者禁忌:hibernate之脏数据检查
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hibernate脏数据检查
什么是脏数据？脏数据并不是废弃和无用的数据，而是状态前后发生变化的数据。我们看下面的代码：
Transaction tx=session.beginTransaction();
//从数据库中加载符合条件的数据
User user=(User)session.load(User.class,”1”);
//改变了user对象的姓名属性，此时user对象成为了所谓的“脏数据”
user.setName(“zx”);
tx.commit();
当事务提交时，Hibernate会对session中的PO(持久化对象)进行检测，判断持久化对象的状态是否发生了改变，如果发生了改变就会将改变更新到数据库中,这种判断持久化对象状态称为脏查询。--------------------------------------------------------------------------------禁止脏数据检查--------------------------------------------------------------------------------pom.xml:
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01.02. xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
03.4.0.0
04.hibernateTest
05.hibernateTest
06.1.0-SNAPSHOT
07.jar
08.hibernateTest
09.http://maven.apache.org
10.
11.
12.junit
13.junit
14.3.8.1
15.test
16.
17.
18.org.hibernate
19.hibernate-core
20.3.3.1.GA
21.
22.
23.org.slf4j
24.slf4j-nop
25.1.5.2
26.
27.
28.javassist
29.javassist
30.3.4.GA
31.
32.
33.org.hibernate
34.hibernate-proxool
35.3.3.1.GA
36.
37.
38.com.oracle
39.ojdbc14
40.10.2.0.3.0
41.runtime
42.
43.
44.
45.hibernateTest
46.
47.
48.src/main/resources
49.
50.
51.src/main/java
52.
53.**/*.java
54.
55.
56.
57.
58.
59.maven-compiler-plugin
60.
61.1.6
62.1.6
63.UTF-8
64.
65.
66.
67.
68.
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
4.0.0
hibernateTest
hibernateTest
1.0-SNAPSHOT
jar
hibernateTest
http://maven.apache.org
junit
junit
3.8.1
test
org.hibernate
hibernate-core
3.3.1.GA
org.slf4j
slf4j-nop
1.5.2
javassist
javassist
3.4.GA
org.hibernate
hibernate-proxool
3.3.1.GA
com.oracle
ojdbc14
10.2.0.3.0
runtime
hibernateTest
src/main/resources
src/main/java
**/*.java
maven-compiler-plugin
1.6
1.6
UTF-8
resources/proxool.xml:
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01.
02.
03.
04.
05.proxool
06.
07.jdbc:oracle:thin:@localhost:1521:XE
08.
09.oracle.jdbc.driver.OracleDriver
10.
11.
12.
13.
14.
15.
16.20
17.
18.5
19.
20.select sysdate from dual
21.
22.
proxool
jdbc:oracle:thin:@localhost:1521:XE
oracle.jdbc.driver.OracleDriver
20
5
select sysdate from dual
resources/hibernate.cfg.xml:
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01.
02.03. PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN"
04. "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
05.
06.
07.
08. org.hibernate.connection.ProxoolConnectionProvider
09.
10.proxool
11.proxool.xml
12.
13.true
14.
15.true
16.
17. org.hibernate.dialect.OracleDialect
18.
19.
20.
21.
PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
org.hibernate.connection.ProxoolConnectionProvider
proxool
proxool.xml
true
true
org.hibernate.dialect.OracleDialect
HibernateTest/Student.java:
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01.package hibernateTest;
02.public class Student {
03. private int id;
04. private String name;
05. private String address;
06. private int age;
07.
08. public int getId() {
09. return id;
10. }
11. public String getName() {
12. return name;
13. }
14. public String getAddress() {
15. return address;
16. }
17. public int getAge() {
18. return age;
19. }
20. public void setId(int id) {
21. this.id = id;
22. }
23. public void setName(String name) {
24. this.name = name;
25. }
26. public void setAddress(String address) {
27. this.address = address;
28. }
29. public void setAge(int age) {
30. this.age = age;
31. }
32.
33.
34.}
package hibernateTest;
public class Student {
private int id;
private String name;
private String address;
private int age;
public int getId() {
return id;
}
public String getName() {
return name;
}
public String getAddress() {
return address;
}
public int getAge() {
return age;
}
public void setId(int id) {
this.id = id;
}
public void setName(String name) {
this.name = name;
}
public void setAddress(String address) {
this.address = address;
}
public void setAge(int age) {
this.age = age;
}
}
HibernateTest/Student.hbm.xml, 注意 mutable="false",这个参数。Hibernate进行一些优化,避免脏检查.
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01.
02.03. "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
04.
05.
06.
07.
08.
09. seq_student
10.
11.
12.
13.
14.
15.
16.
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
seq_student
util/HibernateUtil.java:
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01.package util;
02.import org.hibernate.SessionFactory;
03.import org.hibernate.cfg.Configuration;
04.public class HibernateUtil {
05. private static SessionFactory sessionFactory;
06. static{
07. try {
08. sessionFactory = new Configuration().configure().buildSessionFactory();
09. } catch (Throwable e) {
10. throw new ExceptionInInitializerError(e);
11. }
12. }
13. public static SessionFactory getSessionFactory(){
14. return sessionFactory;
15. }
16. public static void shutdown(){
17. getSessionFactory().close();
18. }
19.}
package util;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
public class HibernateUtil {
private static SessionFactory sessionFactory;
static{
try {
sessionFactory = new Configuration().configure().buildSessionFactory();
} catch (Throwable e) {
throw new ExceptionInInitializerError(e);
}
}
public static SessionFactory getSessionFactory(){
return sessionFactory;
}
public static void shutdown(){
getSessionFactory().close();
}
}
util/StudentManager.java:
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01.package util;
02.import hibernateTest.Student;
03.import org.hibernate.Session;
04.import org.hibernate.Transaction;
05.public class StudentManager {
06. public static void main(String[] args) {
07. Session session = HibernateUtil.getSessionFactory().openSession();
08. Transaction transaction1 = session.beginTransaction();
09. Student stu = (Student) session.get(Student.class, 2);
10. //改变状态，使之成为脏数据,因为设置了 mutable="false"这个参数,所以不会脏查询，这样数据就不会更新
11. stu.setName("kk000000000000");
12. transaction1.commit();
13. session.close();
14.
15. }
16.}
package util;
import hibernateTest.Student;
import org.hibernate.Session;
import org.hibernate.Transaction;
public class StudentManager {
public static void main(String[] args) {
Session session = HibernateUtil.getSessionFactory().openSession();
Transaction transaction1 = session.beginTransaction();
Student stu = (Student) session.get(Student.class, 2);
//改变状态，使之成为脏数据,因为设置了 mutable="false"这个参数,所以不会脏查询，这样数据就不会更新
stu.setName("kk000000000000");
transaction1.commit();
session.close();
}
}
输出的sql结果为:
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01.Hibernate:
02. select
03. student0_.ID as ID0_0_,
04. student0_.name as name0_0_,
05. student0_.address as address0_0_,
06. student0_.age as age0_0_
07. from
08. STUDENT student0_
09. where
10. student0_.ID=?
Hibernate:
select
student0_.ID as ID0_0_,
student0_.name as name0_0_,
student0_.address as address0_0_,
student0_.age as age0_0_
from
STUDENT student0_
where
student0_.ID=? --------------------------------------------------------------------------------允许脏查询--------------------------------------------------------------------------------我们只需要改变Student.hbm.xml ,这里去掉了mutable="false" ,或者设置mutable="true"也可以。
view plaincopy to clipboardprint?
01.
02.03. "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
04.
05.
06.
07.
08.
09. seq_student
10.
11.
12.
13.
14.
15.
16.
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
seq_student
输出的sql:
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01.Hibernate:
02. select
03. student0_.ID as ID0_0_,
04. student0_.name as name0_0_,
05. student0_.address as address0_0_,
06. student0_.age as age0_0_
07. from
08. STUDENT student0_
09. where
10. student0_.ID=?
11.Hibernate:
12. update
13. STUDENT
14. set
15. name=?,
16. address=?,
17. age=?
18. where
19. ID=?
什么是脏数据？脏数据并不是废弃和无用的数据，而是状态前后发生变化的数据。我们看下面的代码：
Transaction tx=session.beginTransaction();
//从数据库中加载符合条件的数据
User user=(User)session.load(User.class,”1”);
//改变了user对象的姓名属性，此时user对象成为了所谓的“脏数据”
user.setName(“zx”);
tx.commit();
当事务提交时，Hibernate会对session中的PO(持久化对象)进行检测，判断持久化对象的状态是否发生了改变，如果发生了改变就会将改变更新到数据库中,这种判断持久化对象状态称为脏查询。--------------------------------------------------------------------------------禁止脏数据检查--------------------------------------------------------------------------------pom.xml:
view plaincopy to clipboardprint?
01.
03.
04.
05.
06.
07.
08.
09.
10.
11.
12.
13.
14.
15.
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17.
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54.
55.
56.
57.
58.
59.
60.
61.
62.
63.
64.
65.
66.
67.
68.
resources/proxool.xml:
view plaincopy to clipboardprint?
01.
02.
03.
04.
05.
06.
07.
08.
09.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
resources/hibernate.cfg.xml:
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01.
02.03. PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN"
04. "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
05.
06.
07.
08. org.hibernate.connection.ProxoolConnectionProvider
09.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
org.hibernate.connection.ProxoolConnectionProvider
HibernateTest/Student.java:
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01.package hibernateTest;
02.public class Student {
03. private int id;
04. private String name;
05. private String address;
06. private int age;
07.
08. public int getId() {
09. return id;
10. }
11. public String getName() {
12. return name;
13. }
14. public String getAddress() {
15. return address;
16. }
17. public int getAge() {
18. return age;
19. }
20. public void setId(int id) {
21. this.id = id;
22. }
23. public void setName(String name) {
24. this.name = name;
25. }
26. public void setAddress(String address) {
27. this.address = address;
28. }
29. public void setAge(int age) {
30. this.age = age;
31. }
32.
33.
34.}
package hibernateTest;
public class Student {
private int id;
private String name;
private String address;
private int age;
public int getId() {
return id;
}
public String getName() {
return name;
}
public String getAddress() {
return address;
}
public int getAge() {
return age;
}
public void setId(int id) {
this.id = id;
}
public void setName(String name) {
this.name = name;
}
public void setAddress(String address) {
this.address = address;
}
public void setAge(int age) {
this.age = age;
}
}
HibernateTest/Student.hbm.xml, 注意 mutable="false",这个参数。Hibernate进行一些优化,避免脏检查.
view plaincopy to clipboardprint?
01.
02.03. "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
04.
05.
06.
07.
08.
09. seq_student
10.
11.
12.
13.
14.
15.
16.
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
seq_student
util/HibernateUtil.java:
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01.package util;
02.import org.hibernate.SessionFactory;
03.import org.hibernate.cfg.Configuration;
04.public class HibernateUtil {
05. private static SessionFactory sessionFactory;
06. static{
07. try {
08. sessionFactory = new Configuration().configure().buildSessionFactory();
09. } catch (Throwable e) {
10. throw new ExceptionInInitializerError(e);
11. }
12. }
13. public static SessionFactory getSessionFactory(){
14. return sessionFactory;
15. }
16. public static void shutdown(){
17. getSessionFactory().close();
18. }
19.}
package util;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
public class HibernateUtil {
private static SessionFactory sessionFactory;
static{
try {
sessionFactory = new Configuration().configure().buildSessionFactory();
} catch (Throwable e) {
throw new ExceptionInInitializerError(e);
}
}
public static SessionFactory getSessionFactory(){
return sessionFactory;
}
public static void shutdown(){
getSessionFactory().close();
}
}
util/StudentManager.java:
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01.package util;
02.import hibernateTest.Student;
03.import org.hibernate.Session;
04.import org.hibernate.Transaction;
05.public class StudentManager {
06. public static void main(String[] args) {
07. Session session = HibernateUtil.getSessionFactory().openSession();
08. Transaction transaction1 = session.beginTransaction();
09. Student stu = (Student) session.get(Student.class, 2);
10. //改变状态，使之成为脏数据,因为设置了 mutable="false"这个参数,所以不会脏查询，这样数据就不会更新
11. stu.setName("kk000000000000");
12. transaction1.commit();
13. session.close();
14.
15. }
16.}
package util;
import hibernateTest.Student;
import org.hibernate.Session;
import org.hibernate.Transaction;
public class StudentManager {
public static void main(String[] args) {
Session session = HibernateUtil.getSessionFactory().openSession();
Transaction transaction1 = session.beginTransaction();
Student stu = (Student) session.get(Student.class, 2);
//改变状态，使之成为脏数据,因为设置了 mutable="false"这个参数,所以不会脏查询，这样数据就不会更新
stu.setName("kk000000000000");
transaction1.commit();
session.close();
}
}
输出的sql结果为:
view plaincopy to clipboardprint?
01.Hibernate:
02. select
03. student0_.ID as ID0_0_,
04. student0_.name as name0_0_,
05. student0_.address as address0_0_,
06. student0_.age as age0_0_
07. from
08. STUDENT student0_
09. where
10. student0_.ID=?
Hibernate:
select
student0_.ID as ID0_0_,
student0_.name as name0_0_,
student0_.address as address0_0_,
student0_.age as age0_0_
from
STUDENT student0_
where
student0_.ID=? --------------------------------------------------------------------------------允许脏查询--------------------------------------------------------------------------------我们只需要改变Student.hbm.xml ,这里去掉了mutable="false" ,或者设置mutable="true"也可以。
view plaincopy to clipboardprint?
01.
02.03. "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
04.
05.
06.
07.
08.
09. seq_student
10.
11.
12.
13.
14.
15.
16.
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
seq_student
输出的sql:
view plaincopy to clipboardprint?
01.Hibernate:
02. select
03. student0_.ID as ID0_0_,
04. student0_.name as name0_0_,
05. student0_.address as address0_0_,
06. student0_.age as age0_0_
07. from
08. STUDENT student0_
09. where
10. student0_.ID=?
11.Hibernate:
12. update
13. STUDENT
14. set
15. name=?,
16. address=?,
17. age=?
18. where
19. ID=?
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