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I have three classes A, B and C; C is derived from B, both classes are mapped to the same table. A has an audited 1:n relation to C with an additional Where-clause; A is audited, C is not. No when I search for an audited version of A and try to access the C's of A, I get an SQL-syntax exception:
Class A:
package com.sample;
import java.util.Set;
import javax.annotation.Generated;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.OneToMany;
import javax.persistence.Table;
import org.hibernate.annotations.Where;
import org.hibernate.envers.AuditJoinTable;
import org.hibernate.envers.Audited;
import org.hibernate.envers.RelationTargetAuditMode;
@Entity
@Audited
@Table(name="A_tab")
public class A {
@Id
@GeneratedValue
@Column(name="id")
Long id;
@Column(name="name" )
String name;
@OneToMany
@JoinColumn(name="allC")
@Where(clause = "TYPE = 'C'")
@Audited(targetAuditMode = RelationTargetAuditMode.NOT_AUDITED)
@AuditJoinTable(name="A_C_AUD")
Set<C> allMyC;
public Long getId() { return id; }
private void setId(Long id) { this.id = id; }
public String getName() { return name; }
public void setName(String name) { this.name = name; }
public Set<C> getAllMyC() { return allMyC; }
public void setAllMyC(Set<C> allC) { this.allMyC = allC; }
}
=============================
Class B:
package com.sample;
import javax.persistence.Column;
import javax.persistence.DiscriminatorColumn;
import javax.persistence.DiscriminatorType;
import javax.persistence.DiscriminatorValue;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Table;
import org.hibernate.envers.Audited;
@Entity
@Table(name="B_tab")
@Audited
@DiscriminatorColumn(
name="type",
discriminatorType=DiscriminatorType.STRING
)
@DiscriminatorValue(value="B")
public class B {
@Id
@GeneratedValue
@Column(name="id")
Long id;
@Column(name="name" )
String name;
public Long getId() { return id; }
private void setId(Long id) { this.id = id; }
public String getName() { return name; }
public void setName(String name) { this.name = name; }
}
=============================
Class C:
package com.sample;
import javax.persistence.DiscriminatorValue;
import javax.persistence.Entity;
@Entity
@DiscriminatorValue(value="C")
public class C extends B {
}
=============================
Searching for rev. 2 of an A with id 2:
AuditReader reader = AuditReaderFactory.get(session);
A ainst = reader.find(A.class, (long)2, 2);
Set<C> allC = ainst.getAllMyC(); // Here the problem occurs
System.out.println(allC.isEmpty());
In line three I get an exception:
WARN: SQL Error: 1054, SQLState: 42S22
05.10.2014 21:35:12 org.hibernate.engine.jdbc.spi.SqlExceptionHelper logExceptions
ERROR: Unknown column 'a_c_aud0_.TYPE' in 'where clause'
Thats correct, because the table of class B contains a column "TYPE", but the table for auditing the relation does not. The sql is
"select a_c_aud0_.REV as col_0_0_, a_c_aud0_.allC as col_0_1_, a_c_aud0_.id as col_0_2_, c1_.id as col_1_0_ from A_C_AUD a_c_aud0_ cross join B_tab c1_ where ( a_c_aud0_.TYPE = 'C') and c1_.type='C' and a_c_aud0_.id=c1_.id and a_c_aud0_.allC=? and a_c_aud0_.REV=(select max(a_c_aud2_.REV) from A_C_AUD a_c_aud2_ where ( a_c_aud2_.TYPE = 'C') and a_c_aud2_.REV<=? and a_c_aud0_.allC=a_c_aud2_.allC and a_c_aud0_.id=a_c_aud2_.id) and a_c_aud0_.REVTYPE<>?"
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