我有两个班级，User和Package。 User可以包含多个Package，而Package可以与多个User相关联。所以我有一个多对多的关联。在我的数据库中，我有三个表：一个用于Users，一个用于Packages，以及Package-User表。
我已经测试了映射。我可以单独保存User和Package，但是当我尝试保存包含与之关联的用户列表的Package时，我无法这样做，而且我有不明白为什么。
以下是我使用Hibernate映射类的方法：
Package:
@ManyToMany(fetch=FetchType.LAZY)
@JoinTable(name="license_usage",
joinColumns={@JoinColumn(name="id_package")},
inverseJoinColumns={@JoinColumn(name="id_user")})
private Collection<PbrUser> pbrUsers;
Users:
@ManyToMany(fetch=FetchType.LAZY)
@JoinTable(name="license_usage",
joinColumns=@JoinColumn(name="id_user"),
inverseJoinColumns=@JoinColumn(name="id_package"))
private Collection<Package> packages;
Process Function，我在其中设置与包关联的用户列表并传递给控制器以便保存到数据库中：
Package pack = new Package();
//System.out.println("Zerei? "+ petrelLicensesInUse);
while (i < reportContent.size()){
phrase = reportContent.get(i);
if(phrase.contains(Constants.licenseUsageIdentifier)){
licenseUsage = true;
licenseUser = false;
licenseIssued = phrase.substring((phrase.indexOf(Constants.totalLicenseAvailableId) + 10),phrase.indexOf(Constants.endLicensesIssued));
licenseUsed = phrase.substring((phrase.indexOf(Constants.totalLicenseUsedId) + 12),phrase.indexOf(Constants.endLicensesUsed));
licenseIssuedNum = Integer.parseInt(licenseIssued);
licenseUsedNum = Integer.parseInt(licenseUsed);
licenseUsageList.add(phrase.replaceAll("; Total of ", ", Used: ").replaceAll("Users of ", "")
.replaceAll(" licenses issued", "").replaceAll(" licenses in use", "").replaceAll("Total of", "Total:")
.replaceAll(" license in use", "").replaceAll(" license issued", "").replace(" ", " "));
if(licenseUsedNum != 0){
pack.setUsers(new ArrayList<PbrUser>());
}
}
if(phrase.contains(Constants.licenseUserIdentifier)){
licenseUsage = false;
licenseUser = true;
currPckg = phrase.substring((phrase.indexOf(Constants.licenseUserIdentifier) + 1),phrase.indexOf(Constants.licenseUserIdentifier + " "));
version = phrase.substring((phrase.indexOf(Constants.version) + 3),phrase.indexOf(Constants.endVersion));
vendorDaemon = phrase.substring((phrase.lastIndexOf(' ') + 1));
pack.setNamePackage(currPckg);
pack.setVersion(version);
pack.setVendorDaemon(vendorDaemon);
pack.setNumberOfPackageLicenses(licenseIssuedNum);
//PackageController.create(pack);
}
if(licenseUser && phrase.contains(Constants.userStartDateId)){
//System.out.println(phrase.indexOf(Constants.userStartDateId));
currDate = transformDate(phrase.substring((phrase.indexOf(Constants.userStartDateId)+Constants.userStartDateId.length()),phrase.length()));
//System.out.println(phrase.substring(Constants.spaceUntilUser +1,phrase.length()).indexOf(" "));
currName = phrase.substring(Constants.spaceUntilUser, (Constants.spaceUntilUser + phrase.substring(Constants.spaceUntilUser +1,phrase.length()).indexOf(" ")+1));
PbrUser pbrUser = new PbrUser(currName);
//PbrUserController.create(pbrUser);
reportMetadataList.add(new ReportMetadata(currName, currPckg, currDate));
if(licenseUsedNum != 0){
//PbrUser pbrUser = new PbrUser(currName);
pack.getUsers().add(pbrUser);
}
contSave++;
}
if(licenseUser && contSave == licenseUsedNum){
PackageController.create(pack);
contSave=0;
}
i++;
}
SaveOrUpdate功能：
static protected void insert(Object object){
Transaction tx = null;
Session session = SessionFactoryUtil.getSessionFactory().getCurrentSession();
try {
tx = session.beginTransaction();
session.saveOrUpdate(object);
tx.commit();
} catch (RuntimeException e) {
if (tx != null && tx.isActive()) {
try {
// Second try catch as the rollback could fail as well
tx.rollback();
} catch (HibernateException e1) {
logger.debug("Error rolling back transaction");
}
// throw again the first exception
throw e;
}
}
}
日志输出：
11:25:05,013 DEBUG logging:194 - Logging Provider: org.jboss.logging.Log4jLoggerProvider
11:25:05,560 INFO Version:66 - HCANN000001: Hibernate Commons Annotations {4.0.5.Final}
11:25:05,591 INFO Version:54 - HHH000412: Hibernate Core {4.3.8.Final}
11:25:05,607 INFO Environment:224 - HHH000205: Loaded properties from resource hibernate.properties: {hibernate.connection.driver_class=org.h2.Driver, hibernate.service.allow_crawling=false, hibernate.dialect=org.hibernate.dialect.H2Dialect, hibernate.max_fetch_depth=5, hibernate.format_sql=true, hibernate.generate_statistics=true, hibernate.connection.username=sa, hibernate.connection.url=jdbc:h2:mem:db1;DB_CLOSE_DELAY=-1;MVCC=TRUE, hibernate.bytecode.use_reflection_optimizer=false, hibernate.jdbc.batch_versioned_data=true, hibernate.connection.pool_size=5}
11:25:05,623 INFO Environment:346 - HHH000021: Bytecode provider name : javassist
11:25:05,747 INFO Configuration:2075 - HHH000043: Configuring from resource: /hibernate.cfg.xml
11:25:05,747 INFO Configuration:2094 - HHH000040: Configuration resource: /hibernate.cfg.xml
11:25:06,091 INFO Configuration:2216 - HHH000041: Configured SessionFactory: null
11:25:09,690 INFO Configuration:2075 - HHH000043: Configuring from resource: /hibernate.cfg.xml
11:25:09,690 INFO Configuration:2094 - HHH000040: Configuration resource: /hibernate.cfg.xml
11:25:09,691 INFO Configuration:2216 - HHH000041: Configured SessionFactory: null
11:25:09,753 WARN DriverManagerConnectionProviderImpl:93 - HHH000402: Using Hibernate built-in connection pool (not for production use!)
11:25:09,831 INFO DriverManagerConnectionProviderImpl:166 - HHH000401: using driver [org.postgresql.Driver] at URL [jdbc:postgresql://localhost:5432/licensecontrol]
11:25:09,831 INFO DriverManagerConnectionProviderImpl:175 - HHH000046: Connection properties: {user=postgres, password=****}
11:25:09,831 INFO DriverManagerConnectionProviderImpl:180 - HHH000006: Autocommit mode: false
11:25:09,831 INFO DriverManagerConnectionProviderImpl:102 - HHH000115: Hibernate connection pool size: 1 (min=1)
11:25:10,988 INFO Dialect:145 - HHH000400: Using dialect: org.hibernate.dialect.PostgreSQLDialect
11:25:11,052 INFO LobCreatorBuilder:123 - HHH000424: Disabling contextual LOB creation as createClob() method threw error : java.lang.reflect.InvocationTargetException
11:25:11,957 WARN RootClass:288 - HHH000038: Composite-id class does not override equals(): schlumberger.sis.licenseControl.model.LicenseUsagePK
11:25:11,957 WARN RootClass:289 - HHH000039: Composite-id class does not override hashCode(): schlumberger.sis.licenseControl.model.LicenseUsagePK
11:25:12,004 INFO TransactionFactoryInitiator:62 - HHH000399: Using default transaction strategy (direct JDBC transactions)
11:25:12,005 INFO ASTQueryTranslatorFactory:47 - HHH000397: Using ASTQueryTranslatorFactory
11:25:14,238 INFO SchemaUpdate:207 - HHH000228: Running hbm2ddl schema update
11:25:14,238 INFO SchemaUpdate:218 - HHH000102: Fetching database metadata
11:25:14,239 INFO SchemaUpdate:230 - HHH000396: Updating schema
11:25:14,426 INFO TableMetadata:66 - HHH000261: Table found: public.license_usage
11:25:14,426 INFO TableMetadata:67 - HHH000037: Columns: [dateinitial, usagequantity, dateend, id_user, id_package]
11:25:14,426 INFO TableMetadata:69 - HHH000108: Foreign keys: [fk_a7jlro2c6m3y8ofoxw0kajv78, fk_f342pmsmoib0j9osyh4fkxihm]
11:25:14,426 INFO TableMetadata:70 - HHH000126: Indexes: [license_usage_pkey]
11:25:14,535 INFO TableMetadata:66 - HHH000261: Table found: public.package
11:25:14,551 INFO TableMetadata:67 - HHH000037: Columns: [quantityoflicenses, vendordaemon, description, namepackage, id_package, version]
11:25:14,551 INFO TableMetadata:69 - HHH000108: Foreign keys: []
11:25:14,551 INFO TableMetadata:70 - HHH000126: Indexes: [uk_atlshd2rl0yk0yfiw82t0vwc, package_pkey]
11:25:14,660 INFO TableMetadata:66 - HHH000261: Table found: public.users
11:25:14,660 INFO TableMetadata:67 - HHH000037: Columns: [unit, phone, pbrkey, name, location, id_user, email]
11:25:14,660 INFO TableMetadata:69 - HHH000108: Foreign keys: []
11:25:14,660 INFO TableMetadata:70 - HHH000126: Indexes: [users_pkey]
11:25:14,660 INFO SchemaUpdate:267 - HHH000232: Schema update complete
11:25:15,066 DEBUG SQL:109 -
select
nextval ('hibernate_sequence')
Hibernate:
select
nextval ('hibernate_sequence')
11:25:15,269 DEBUG SQL:109 -
insert
into
package
(description, namePackage, quantityOfLicenses, vendorDaemon, version, id_package)
values
(?, ?, ?, ?, ?, ?)
Hibernate:
insert
into
package
(description, namePackage, quantityOfLicenses, vendorDaemon, version, id_package)
values
(?, ?, ?, ?, ?, ?)
11:25:15,285 DEBUG SQL:109 -
insert
into
license_usage
(id_package, id_user)
values
(?, ?)
Hibernate:
insert
into
license_usage
(id_package, id_user)
values
(?, ?)
11:25:15,286 INFO StatisticalLoggingSessionEventListener:275 - Session Metrics {
66504 nanoseconds spent acquiring 1 JDBC connections;
0 nanoseconds spent releasing 0 JDBC connections;
855522 nanoseconds spent preparing 3 JDBC statements;
7439438 nanoseconds spent executing 2 JDBC statements;
0 nanoseconds spent executing 0 JDBC batches;
0 nanoseconds spent performing 0 L2C puts;
0 nanoseconds spent performing 0 L2C hits;
0 nanoseconds spent performing 0 L2C misses;
88938261 nanoseconds spent executing 1 flushes (flushing a total of 1 entities and 1 collections);
0 nanoseconds spent executing 0 partial-flushes (flushing a total of 0 entities and 0 collections)
}
11:25:15,286 INFO AbstractBatchImpl:208 - HHH000010: On release of batch it still contained JDBC statements
答案 0 :(得分：1)
关于您的异常，它意味着：您希望保存一个包，其中用户之前不保留用户对象本身。如果这应该自动发生，你必须添加级联 - 这个例子只是使用＆＃34; cascade all＆＃34;对于包裹 - 请检查您的应用程序真正需要的是什么。
包装：
$main-font: "Microsoft_YaHei247019", "Whitney SSm A", "Whitney SSm B", "Verdana"
用户：
@ManyToMany(fetch=FetchType.LAZY, cascade = CascadeType.ALL)
@JoinTable(name="license_usage",
joinColumns={@JoinColumn(name="id_package")},
inverseJoinColumns={@JoinColumn(name="id_user")})
private Collection<PbrUser> pbrUsers;