Java 更新映射为@ManyToMany、@JoinTable和@OrderColumn(具有唯一约束)的实体列表时出现MySQLIntegrityConstraintViolationException
我在Java 更新映射为@ManyToMany、@JoinTable和@OrderColumn(具有唯一约束)的实体列表时出现MySQLIntegrityConstraintViolationException,java,mysql,jpa,eclipselink,unique-constraint,Java,Mysql,Jpa,Eclipselink,Unique Constraint,我在资格预审和公司实体(合伙)之间存在多对多关系。三个表的DDL为: CREATE TABLE Prequalifications ( id INTEGER NOT NULL IDENTITY, user_id INTEGER NOT NULL, name VARCHAR(100) NOT NULL, PRIMARY KEY (id), FOREIGN KEY (user_id) REFER
资格预审
和公司
实体(合伙
)之间存在多对多关系。三个表的DDL为:
CREATE TABLE Prequalifications
(
id INTEGER NOT NULL IDENTITY,
user_id INTEGER NOT NULL,
name VARCHAR(100) NOT NULL,
PRIMARY KEY (id),
FOREIGN KEY (user_id) REFERENCES Users (id)
);
CREATE TABLE Partnerships
(
prequalification_id INTEGER NOT NULL,
company_id INTEGER NOT NULL,
ordinal_nbr SMALLINT DEFAULT 0 NOT NULL,
PRIMARY KEY (prequalification_id, company_id),
FOREIGN KEY (prequalification_id) REFERENCES Prequalifications (id),
FOREIGN KEY (company_id) REFERENCES Companies (id),
UNIQUE (prequalification_id, ordinal_nbr)
);
CREATE TABLE Companies
(
id INTEGER NOT NULL,
dnd_type VARCHAR(10) NOT NULL,
PRIMARY KEY (id),
FOREIGN KEY (id) REFERENCES Organizations (id) -- just an inherited ID, never mind!
);
请注意合作伙伴关系的PQ ID和序号上的唯一约束:每个PQ只能有一个公司职位
这在资格预审中被映射为@manytomy
+@JoinTable
,包括一个@OrderColumn
,用于每个PQ的公司订单(合伙企业的订单列为ordernal\u nbr):
不要被它吓倒。引用{pqHome.participatingcompanys}
的列表只包含可选(外部)公司
当我点击更新按钮(未显示)时,调用PqHome
bean上的update
方法。使用EclipseLink 2.3.2在GlassFish 3.1.2上执行代码时,抛出以下异常:
Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Duplicate entry '2-2' for key 'partnerships_multi_uq'
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:525)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
at com.mysql.jdbc.Util.getInstance(Util.java:386)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1039)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3609)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3541)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2002)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2163)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2624)
at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2127)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2427)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2345)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2330)
at com.mysql.jdbc.jdbc2.optional.PreparedStatementWrapper.executeUpdate(PreparedStatementWrapper.java:875)
at com.sun.gjc.spi.base.PreparedStatementWrapper.executeUpdate(PreparedStatementWrapper.java:125)
at org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.executeDirectNoSelect(DatabaseAccessor.java:831)
... 128 more
此异常在日志中重复多次。其他PQ也有同样的问题,只涉及其他独特的列组合,例如“1-1”。可以在此处找到服务器日志:
更新代码有什么问题吗?它在Hibernate上运行时不会出现问题。EclipseLink更新联接表中的@OrderColumn以有效地维护顺序,因此不能对其进行唯一约束。因此,请删除或延迟唯一约束
您可以在EclipseLink上记录一个bug,添加一个选项以避免此限制。我曾经在这里创建了一个bug报告:
@ManagedBean
@ViewScoped
public class PqHome implements DropListener, Serializable
{
...
private Prequalification pq;
private Integer userId;
private List<Company> participatingCompanies; // xetters omitted!
...
public void update()
{
// assign new owner
pq.setUser(userService.findSingleUser(userId));
Company internal = companyManager.getInternalCompany();
// find internal company
int index = participatingCompanies.indexOf(internal);
// if internal company missing or at non-zero index: we need to repair this
if ( index != 0 )
{
// if internal exists at some wrong place, remove it
if ( index > 0 )
{
participatingCompanies.remove(index);
}
// (re-)add at index zero
participatingCompanies.add(0, internal);
}
pq.setCompanies(participatingCompanies);
// update and get *new* merged instance
pq = pqService.update(pq);
participatingCompanies = null;
init(); // some not so important (re-)initialization...
}
...
}
<rich:pickList value="#{pqHome.participatingCompanies}"
var="company"
converter="#{companyConverter}"
orderable="true"
sourceCaption="Available companies"
targetCaption="Selected companies">
<f:selectItems value="#{companyManager.externalCompanies}" />
<rich:column>#{company.name}</rich:column>
</rich:pickList>
Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Duplicate entry '2-2' for key 'partnerships_multi_uq'
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:525)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
at com.mysql.jdbc.Util.getInstance(Util.java:386)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1039)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3609)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3541)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2002)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2163)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2624)
at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2127)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2427)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2345)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2330)
at com.mysql.jdbc.jdbc2.optional.PreparedStatementWrapper.executeUpdate(PreparedStatementWrapper.java:875)
at com.sun.gjc.spi.base.PreparedStatementWrapper.executeUpdate(PreparedStatementWrapper.java:125)
at org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.executeDirectNoSelect(DatabaseAccessor.java:831)
... 128 more