java - hibernate注释中的错误映射

Question

当尝试通过 Manytomany 连接两个表时，出现此错误: 错误 [org.hibernate.tool.hbm2ddl.SchemaUpdate] 失败:更改表 PARAM_TRENDVALUE 添加约束 FK_TrendValue 外键(AreaID、PcID、DeviceID、ValueID)引用 usrIFDBMaster.tblTrdProcessValues 08:44:43,800 错误 [org.hibernate.tool.hbm2ddl.SchemaUpdate] Die 'usrIFDBMaster.tblTrdProcessValues.DeviceID'-Spalte hat nichtenselben Datentyp wie die verweisende 'PARAM_TRENDVALUE.PcID'-Spalte im 'FK_TrendValue'-Fremdschlüssel。

主要是 hibernate 正在尝试映射错误的列。

Param.java:

这是关键:

@EmbeddedId
@AttributeOverrides( {
        @AttributeOverride(name = "pcId", column = @Column(name = "PcID", nullable = false)),
        @AttributeOverride(name = "unitId", column = @Column(name = "UnitID", nullable = false)),
        @AttributeOverride(name = "paramId", column = @Column(name = "ParamID", nullable = false)) })
public ParamId getId() {
    return this.id;
}

这是映射:

/**
 * @return the connection
 */
@ManyToMany
@ForeignKey(name = "FK_Param")
@JoinTable(
        name="PARAM_TRENDVALUE",
        inverseJoinColumns={    
                @JoinColumn(name = "PcID", referencedColumnName = "PcID"),
                @JoinColumn(name = "AreaID", referencedColumnName = "AreaID"),
                @JoinColumn(name = "DeviceID", referencedColumnName = "DeviceID"),
                @JoinColumn(name = "ValueID", referencedColumnName = "ValueID")
        }
)
public List<TrendValue> getTrendValues() {
    return trendValues; 
}

趋势值.java:

这是关键:

@EmbeddedId
@AttributeOverrides( {
        @AttributeOverride(name = "pcId", column = @Column(name = "PcID", nullable = false)),   
        @AttributeOverride(name = "areaId", column = @Column(name = "AreaID", nullable = false)),
        @AttributeOverride(name = "deviceId", column = @Column(name = "DeviceID", nullable = false)),
        @AttributeOverride(name = "valueId", column = @Column(name = "ValueID", nullable = false))
         })
public TrendValueId getId() {
    return this.id;
}

这是映射:

/**
 * @return the params
 */
@ManyToMany(
        mappedBy="trendValues",
        targetEntity=Param.class
    )
@ForeignKey(name = "FK_TrendValue")
public List<Param> getParams() {
    return params;
}

这是我尝试使用的第一个多对多，它应该可以工作，我已经尝试过不使用 inversejoincolumns，使用 joincolumns，在“joincolumns/inversejoincolumns”中准确定义表和数据类型，... 不知道还有什么问题。

Answer 1

The documentation说:

You can override the constraint name by use @ForeignKey. Note that this annotation has to be placed on the owning side of the relationship, inverseName referencing to the other side constraint.

@Entity
public class Woman {
    ...
    @ManyToMany(cascade = {CascadeType.ALL})
    @ForeignKey(name = "TO_WOMAN_FK", inverseName = "TO_MAN_FK")
    public Set<Man> getMens() {
        return mens;
    }
}