问题描述
我将类import QtQuick 2.11
import QtQuick.Window 2.11
import QtGraphicalEffects 1.0
Window {
width: 640
height: 480
visible: true
title: qsTr("Hello World")
Image {
id: img
anchors.fill: parent
source: "your_non_fitting_image.png"
fillMode: Image.PreserveAspectFit
visible: false
}
Item {
id: mask
anchors.fill: img
visible: false
Rectangle {
color: "white"
radius: 20
anchors.centerIn: parent
width: img.paintedWidth
height: img.paintedHeight
}
}
OpacityMask {
anchors.fill: img
source: img
maskSource: mask
}
}
定义为嵌入式id类。
我定义了类CKey，并为复合主键使用了双向字符串字段桥。
我将类BEntity和关系AEntity定义为ManyToOne。
BEntity然后，我尝试对Entity类@Entity @Indexed
public class AEntity {
@ManyToOne(optional = false) @IndexedEmbedded(depth = 1,includeEmbeddedobjectId = true)
@JoinColumns(value = { @JoinColumn(name = "fk_fId",referencedColumnName = "fId"),@JoinColumn(name = "fk_sId",referencedColumnName = "sId") },foreignKey = @ForeignKey(name = "fk_sub"))
private BEntity bEntity;
}
@Entity @Indexed
public class BEntity {
@EmbeddedId @IndexedEmbedded @FieldBridge(impl = CompositeIdBridge.class)
private CKey cKey;
}
@Embeddable @Indexed
public class CKey {
@Field
private String fId;
@Field
private String sId;
}
public class CompositeIdBridge implements TwoWayStringBridge {
@Override
public String objectToString(Object object) {
return String.format("%s.%s",(CKey) object.getFId(),(CKey) object.getSId());
}
@Override
public Object stringToObject(String stringValue) {
String[] compositeIdProperties = stringValue.split("\\.");
return new CKey(compositeIdProperties[1],compositeIdProperties[2]);
}
}
进行休眠搜索，但是遇到了此异常：
在AEntity中找不到字段bEntity.cKey.fId
AEntity解决方法
您在@IndexedEmbedded(depth = 1)中的AEntity明确要求仅嵌入深度为1的字段。 bEntity.cKey相对于bEntity的深度为1，但是bEntity.cKey.fId和bEntity.cKey.sId的深度为2。
您应该增加深度：
@Entity @Indexed
public class AEntity {
@ManyToOne(optional = false)
@IndexedEmbedded(depth = 2,includeEmbeddedObjectId = true)
@JoinColumns(value = { @JoinColumn(name = "fk_fId",referencedColumnName = "fId"),@JoinColumn(name = "fk_sId",referencedColumnName = "sId") },foreignKey = @ForeignKey(name = "fk_sub"))
private BEntity bEntity;
}
...或者您应该明确包含以下字段：
@Entity @Indexed
public class AEntity {
@ManyToOne(optional = false)
@IndexedEmbedded(depth = 1,includeEmbeddedObjectId = true,includePaths = {"cKey.fId","cKey.sId"})
@JoinColumns(value = { @JoinColumn(name = "fk_fId",foreignKey = @ForeignKey(name = "fk_sub"))
private BEntity bEntity;
}