com.github.braisdom.objsql.annotations

注释类型 Relation

@Target(value=FIELD)
 @Retention(value=RUNTIME)
public @interface Relation

It describes the relation between different domain models and domain models, such as, a member has many orders, and the relation field will be filled after querying.

     public class Member {

可选元素概要

可选元素

限定符和类型	可选元素和说明
String	condition
String	foreignFieldName
String	foreignKey The attribute applies in base table who maps a Java class
String	primaryFieldName Returns field name of Java Class, which is a formal parameter in the relation calculation, and carries the result of relation calculation only.
String	primaryKey Returns column name of the base table who associates the sub table.
RelationType	relationType Returns the type of the relation who annotates a Java Field.

元素详细资料

relationType

public abstract RelationType relationType

Returns the type of the relation who annotates a Java Field.

返回:

另请参阅:

RelationType.HAS_ONE, RelationType.BELONGS_TO, RelationType.HAS_MANY

默认值:

com.github.braisdom.objsql.relation.RelationType.HAS_MANY

primaryKey

public abstract String primaryKey

Returns column name of the base table who associates the sub table.
The primaryKey has different name mapped in different relation endpoint.
In HAS_MANY and HAS_ONE, the relation applied in the base table, so the primary key need not to be assigned, it will follow the column assigned with @Column or be a default value formatted from field name.
In BELONGS_TO, the relation applied in the sub table, so the primary key gets from Java Class who maps a base table.

返回:

另请参阅:

Relationship.getPrimaryKey()

默认值:

""

primaryFieldName

public abstract String primaryFieldName

Returns field name of Java Class, which is a formal parameter in the relation calculation, and carries the result of relation calculation only.
In BELONGS_TO, it associates the field name which maps the base table.

返回:

默认值:

""

foreignKey

public abstract String foreignKey

The attribute applies in base table who maps a Java class

返回:

默认值:

""

foreignFieldName

public abstract String foreignFieldName

默认值:

""

condition

public abstract String condition

默认值:

""