[英]How do I set up a recursive, many-to-many relationship WITH an association class using JPA?
So I'm trying to create a pharmacy database that, among other things, keeps track of drug-to-drug interactions.因此,我正在尝试创建一个药房数据库,其中包括跟踪药物与药物之间的相互作用。 I have a Drug entity with various members and associations and they all seem to work out fine thus far.我有一个拥有各种成员和协会的药物实体,到目前为止,它们似乎都运行良好。 The one implementation I'm not sure I have down correct is a recursive, many-to-many relationship with the Drug entity using an association class.我不确定我是否正确的一个实现是使用关联 class 与 Drug 实体建立递归的多对多关系。 The association class (DrugDrugIX) has 2 foreign keys - one from each drug - and a description and assignment of how severe is that interaction.关联 class (DrugDrugIX) 有 2 个外键 - 来自每种药物的一个 - 以及该相互作用的严重程度的描述和分配。
What I have so far works, in that it will compile and run and let me add Drugs and interactions.到目前为止我所做的工作,因为它将编译和运行,让我添加药物和交互。 However, I certainly don't think what I'm doing is the most optimal -- or even correct.但是,我当然不认为我正在做的事情是最优化的——甚至不是正确的。 Any advice on how to optimize what I'm trying to do?关于如何优化我正在尝试做的任何建议?
The Drug entity (some members omitted for brevity): Drug实体(为简洁起见省略了一些成员):
@Entity
@Table (name = "drugs")
@NamedQueries({
@NamedQuery (name = Drug.FIND_ALL_BY_NAME,
query = "SELECT d FROM Drug d WHERE LOWER (d.chemical_name) LIKE LOWER (CONCAT ('%', :searchString, '%'))" )
})
public class Drug
{
// QUERY STRING(S)
public static final String FIND_ALL_BY_NAME = "Drug.findAllByName";
@Id
@GeneratedValue (strategy = GenerationType.IDENTITY)
private long did;
private String chemical_name;
private String description;
// ASSOCIATION(S)
is this the correct implementation (???)
<----------------------------------------------------------------------------------->
@OneToMany (mappedBy = "base", cascade = CascadeType.PERSIST)
private List<DrugDrugIX> interxAsBase;
@OneToMany (mappedBy = "offender", cascade = CascadeType.PERSIST)
private List<DrugDrugIX> interxAsOffender;
<----------------------------------------------------------------------------------->
@ManyToOne (cascade = CascadeType.PERSIST)
private DEA_Class schedule;
@OneToOne (cascade = CascadeType.PERSIST)
private Pharmacology PK_profile;
(...) other associations, getters and setters here (...)
public void addInterxAsBase (DrugDrugIX interaction)
{
if (this.interxAsBase == null)
interxAsBase = new ArrayList<>();
interxAsBase.add (interaction);
}
public void addInterxAsOffender (DrugDrugIX interaction)
{
if (this.interxAsOffender == null)
interxAsOffender = new ArrayList<>();
interxAsOffender.add (interaction);
}
}
The DrugDrugIX association entity: DrugDrugIX关联实体:
@Entity
@Table (name = "drug_drug_interactions")
public class DrugDrugIX
{
@EmbeddedId
private DrugDrugIX_PK interaction_CPK;
private int severityLevel = -1;
// ASSOCIATION(S)
@ManyToOne
@MapsId ("base")
private Drug base;
@ManyToOne
@MapsId ("offender")
private Drug offender;
(...) getters, setters omitted for brevity (...)
public void registerInteraction (Drug object, Drug precipitate)
{
if (this.base == null)
this.base = object;
if (this.offender == null)
this.offender = precipitate;
if ((this.base == object && this.offender == precipitate) && (severityLevel == -1))
{
object.addInterxAsBase(this);
precipitate.addInterxAsOffender(this);
}
}
}
...and just for posterity, the Embeddable that comprises the primary key of the DrugDrugIX entity: ...并且只是为了后代,包含 DrugDrugIX 实体的主键的 Embeddable:
@Embeddable
public class DrugDrugIX_PK implements Serializable
{
private long base;
private long offender;
private String description;
// CONSTRUCTORS
public DrugDrugIX_PK () {}
public DrugDrugIX_PK (Drug base, Drug offender, String description)
{
this.base = base.getDID();
this.offender = offender.getDID();
this.description = description;
}
// ACCESSORS
public String getDescription () { return this.description; }
// MISCELLANEOUS
@Override
public boolean equals (Object other)
{
if (other instanceof DrugDrugIX_PK)
{
DrugDrugIX_PK second = (DrugDrugIX_PK) other;
return (this.base == second.base) && (offender == second.offender) && (this.description.equals (description));
}
else
return false;
}
@Override
public int hashCode () { return (int) (base + offender); }
}
I pray to the stackoverflow gods for guidance..我向stackoverflow大神祈祷寻求指导..
You do not need to use recursion.您不需要使用递归。 Just use two nested loops.只需使用两个嵌套循环。 Something like this pseudo code:像这样的伪代码:
drugs = {1, 4, 6}
for drug1 in drugs
for drug2 in drugs
get_interaction drug1, drug2
Drugs being administered are represented by integers in the drugs array.正在给药的药物由药物数组中的整数表示。
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