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hibernate(jpa)復(fù)合主鍵annotation聲明方法

開發(fā) 后端
hibernate(jpa)復(fù)合主鍵annotation聲明方法。
CREATE TABLE TB_HOUR_DATA
(
  STAT_DATE  DATE                   NOT NULL,
  PATH_ID    NUMBER(20)             NOT NULL,
  VALUE      VARCHAR2(512 BYTE),
  TYPE       NUMBER(1)              NOT NULL
)


其中,復(fù)合主鍵為(STAT_DATE,PATH_ID,TYPE)

針對(duì)這種情況,hibernate(jpa) 的 annotation 映射聲明如下:

1、復(fù)合主鍵類HourDataPK

package net.kong.wolf.stat.db.entity;
import java.io.Serializable;
import java.util.Date;
import javax.persistence.Column;
import javax.persistence.Embeddable;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;
@Embeddable
public class HourDataPK implements Serializable {
/** *//**
 *
 */
private static final long serialVersionUID = 1L;
@ManyToOne
@JoinColumn(name = "path_id", nullable = false)
private Path path;
@Column(name = "stat_date")
@Temporal(TemporalType.DATE)
private Date statDate;
private int type;
public Path getPath() {
return path;
}
public void setPath(Path path) {
this.path = path;
}
public Date getStatDate() {
return statDate;
}
public void setStatDate(Date statDate) {
this.statDate = statDate;
}
public int getType() {
return type;
}
public void setType(int type) {
this.type = type;
}
}

2、實(shí)體類HourData:
    package net.kong.wolf.stat.db.entity;
import java.io.Serializable;
import javax.persistence.EmbeddedId;
import javax.persistence.Entity;
import javax.persistence.Table;
import net.kong.wolf.stat.core.Text;
@Entity
@Table(name = "TB_HOUR_DATA")
public class HourData implements Serializable {
/** *//**
 *
 */
private static final long serialVersionUID = 1L;
@EmbeddedId
private HourDataPK pk;
private String value;
public String getValue() {
return value;
}
public void setValue(String value) {
this.value = value;
}
public int[] getHours() {
return parseValue(value);
}
private int[] parseValue(String value) {
int[] result = new int[24];
for (int i = 0; i < 24; i++) {
result[i] = -1;
}
if (value == null) {
return result;
}
String[] hs = Text.splitCSV(value);
int len = Math.min(24, hs.length);
for (int i = 0; i < len; i++) {
result[i] = Text.parseInt(hs[i], -1);
}
return result;
}
public void setHours(int[] hours) {
int[] tHours = parseValue(value);
StringBuilder sb = new StringBuilder();
int len = Math.min(24, hours.length);
for (int i = 0; i < len; i++) {
sb.append(hours[i] < 0 ? tHours[i] : hours[i]).append(',');
}
sb.deleteCharAt(sb.length() - 1);
this.value = sb.toString();
}
public HourDataPK getPk() {
return pk;
}
public void setPk(HourDataPK pk) {
this.pk = pk;
}
}
您正在閱讀:hibernate(jpa)復(fù)合主鍵annotation聲明方法

【編輯推薦】

  1. 讓Spring幫助你在MVC層解決JPA的緩遲加載問題
  2. JPA重整ORM山河
  3. 利用EJB 3.0的JPA設(shè)計(jì)企業(yè)應(yīng)用程序
責(zé)任編輯:張攀 來源: 豆豆網(wǎng)
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