初始化使用grails鉴别器配置的子类对象
我有一个父类:初始化使用grails鉴别器配置的子类对象,grails,groovy,grails-domain-class,table-per-hierarchy,discriminator,Grails,Groovy,Grails Domain Class,Table Per Hierarchy,Discriminator,我有一个父类: class A{ Integer a1 Integer a2 static mapping = { table 'table_A' version true tablePerHierarchy true discriminator column:[name:'typeOfChild',length:8] id generator:'sequence', params:[seq
class A{
Integer a1
Integer a2
static mapping = {
table 'table_A'
version true
tablePerHierarchy true
discriminator column:[name:'typeOfChild',length:8]
id generator:'sequence', params:[sequence:'TEMP_SEQ']
columns{
id column: 'ID'
version column: 'VERSION'
a1 column: 'A1'
b1 column: 'A2'
}
class Child1 extends A{
static mapping = {
discriminator value: "child1"
}
}
class Child2 extends A{
static mapping = {
discriminator value: "child2"
}
}
如上所示,类Child1和Child2扩展了类A,鉴别器列将用于区分实例
数据库表如下:
create table table_A(
ID integer(2),
A1 integer(2),
A2 integer(2),
typeOfChild varchar2(8),
primary key(ID));
class ContainerClass{
....
List child1 = new ArrayList()
List child2 = new ArrayList()
....
static hasMany[] = [child1:Child1,child2:Child2]
static mapping = {
...
child1 cascade : "all-delete-orphan"
child2 cascade : "all-delete-orphan"
}
def getChild1List() {
return LazyList.decorate(child1, FactoryUtils.instantiateFactory(Child1.class))
}
def getChild2List() {
return LazyList.decorate(child2, FactoryUtils.instantiateFactory(Child2.class))
}
}
org.springframework.dao.InvalidDataAccessResourceUsageException: could not initialize a collection: [###################################]
at java.lang.Thread.run(Thread.java:619)
Caused by: org.hibernate.exception.SQLGrammarException: could not initialize a collection:
Caused by: java.sql.SQLSyntaxErrorException: ORA-00942: table or view does not exist
at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:439)
at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:395)
at oracle.jdbc.driver.T4C8Oall.processError(T4C8Oall.java:802)
at oracle.jdbc.driver.T4CTTIfun.receive(T4CTTIfun.java:436)
at oracle.jdbc.driver.T4CTTIfun.doRPC(T4CTTIfun.java:186)
at oracle.jdbc.driver.T4C8Oall.doOALL(T4C8Oall.java:521)
at oracle.jdbc.driver.T4CPreparedStatement.doOall8(T4CPreparedStatement.java:205)
at oracle.jdbc.driver.T4CPreparedStatement.executeForDescribe(T4CPreparedStatement.java:861)
at oracle.jdbc.driver.OracleStatement.executeMaybeDescribe(OracleStatement.java:1145)
at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:1267)
at oracle.jdbc.driver.OraclePreparedStatement.executeInternal(OraclePreparedStatement.java:3449)
at oracle.jdbc.driver.OraclePreparedStatement.executeQuery(OraclePreparedStatement.java:3493)
at oracle.jdbc.driver.OraclePreparedStatementWrapper.executeQuery(OraclePreparedStatementWrapper.java:
at org.apache.commons.dbcp.DelegatingPreparedStatement.executeQuery(DelegatingPreparedStatement.java:9
at org.apache.commons.dbcp.DelegatingPreparedStatement.executeQuery(DelegatingPreparedStatement.java:9
... 1 more
现在我有另一个类ContainerClass,如下所示:
create table table_A(
ID integer(2),
A1 integer(2),
A2 integer(2),
typeOfChild varchar2(8),
primary key(ID));
class ContainerClass{
....
List child1 = new ArrayList()
List child2 = new ArrayList()
....
static hasMany[] = [child1:Child1,child2:Child2]
static mapping = {
...
child1 cascade : "all-delete-orphan"
child2 cascade : "all-delete-orphan"
}
def getChild1List() {
return LazyList.decorate(child1, FactoryUtils.instantiateFactory(Child1.class))
}
def getChild2List() {
return LazyList.decorate(child2, FactoryUtils.instantiateFactory(Child2.class))
}
}
org.springframework.dao.InvalidDataAccessResourceUsageException: could not initialize a collection: [###################################]
at java.lang.Thread.run(Thread.java:619)
Caused by: org.hibernate.exception.SQLGrammarException: could not initialize a collection:
Caused by: java.sql.SQLSyntaxErrorException: ORA-00942: table or view does not exist
at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:439)
at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:395)
at oracle.jdbc.driver.T4C8Oall.processError(T4C8Oall.java:802)
at oracle.jdbc.driver.T4CTTIfun.receive(T4CTTIfun.java:436)
at oracle.jdbc.driver.T4CTTIfun.doRPC(T4CTTIfun.java:186)
at oracle.jdbc.driver.T4C8Oall.doOALL(T4C8Oall.java:521)
at oracle.jdbc.driver.T4CPreparedStatement.doOall8(T4CPreparedStatement.java:205)
at oracle.jdbc.driver.T4CPreparedStatement.executeForDescribe(T4CPreparedStatement.java:861)
at oracle.jdbc.driver.OracleStatement.executeMaybeDescribe(OracleStatement.java:1145)
at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:1267)
at oracle.jdbc.driver.OraclePreparedStatement.executeInternal(OraclePreparedStatement.java:3449)
at oracle.jdbc.driver.OraclePreparedStatement.executeQuery(OraclePreparedStatement.java:3493)
at oracle.jdbc.driver.OraclePreparedStatementWrapper.executeQuery(OraclePreparedStatementWrapper.java:
at org.apache.commons.dbcp.DelegatingPreparedStatement.executeQuery(DelegatingPreparedStatement.java:9
at org.apache.commons.dbcp.DelegatingPreparedStatement.executeQuery(DelegatingPreparedStatement.java:9
... 1 more
现在,当我为ContainerClass创建一个对象,并且数据库中也有需要获取的数据时,LazyList.decoration函数无法初始化子对象列表。我得到一个例外,如下所示:
create table table_A(
ID integer(2),
A1 integer(2),
A2 integer(2),
typeOfChild varchar2(8),
primary key(ID));
class ContainerClass{
....
List child1 = new ArrayList()
List child2 = new ArrayList()
....
static hasMany[] = [child1:Child1,child2:Child2]
static mapping = {
...
child1 cascade : "all-delete-orphan"
child2 cascade : "all-delete-orphan"
}
def getChild1List() {
return LazyList.decorate(child1, FactoryUtils.instantiateFactory(Child1.class))
}
def getChild2List() {
return LazyList.decorate(child2, FactoryUtils.instantiateFactory(Child2.class))
}
}
org.springframework.dao.InvalidDataAccessResourceUsageException: could not initialize a collection: [###################################]
at java.lang.Thread.run(Thread.java:619)
Caused by: org.hibernate.exception.SQLGrammarException: could not initialize a collection:
Caused by: java.sql.SQLSyntaxErrorException: ORA-00942: table or view does not exist
at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:439)
at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:395)
at oracle.jdbc.driver.T4C8Oall.processError(T4C8Oall.java:802)
at oracle.jdbc.driver.T4CTTIfun.receive(T4CTTIfun.java:436)
at oracle.jdbc.driver.T4CTTIfun.doRPC(T4CTTIfun.java:186)
at oracle.jdbc.driver.T4C8Oall.doOALL(T4C8Oall.java:521)
at oracle.jdbc.driver.T4CPreparedStatement.doOall8(T4CPreparedStatement.java:205)
at oracle.jdbc.driver.T4CPreparedStatement.executeForDescribe(T4CPreparedStatement.java:861)
at oracle.jdbc.driver.OracleStatement.executeMaybeDescribe(OracleStatement.java:1145)
at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:1267)
at oracle.jdbc.driver.OraclePreparedStatement.executeInternal(OraclePreparedStatement.java:3449)
at oracle.jdbc.driver.OraclePreparedStatement.executeQuery(OraclePreparedStatement.java:3493)
at oracle.jdbc.driver.OraclePreparedStatementWrapper.executeQuery(OraclePreparedStatementWrapper.java:
at org.apache.commons.dbcp.DelegatingPreparedStatement.executeQuery(DelegatingPreparedStatement.java:9
at org.apache.commons.dbcp.DelegatingPreparedStatement.executeQuery(DelegatingPreparedStatement.java:9
... 1 more
有没有什么不同的方法可以让像这些带有grails discriminator参数的子类和父类中的整个表映射在一起 ORA-00942说明可在此处查看: