java复合主键注解_java hibernate使用注解来定义联合主键_java_脚本之家

ゞ浴缸里的玫瑰 2022-11-03 11:23 200阅读 0赞

java  hibernate使用注解来定义联合主键

下面使用hibernate的API中说明的三种方式来定义主键，主要使用Annotation来定义hibernate中的联合主键

下面取至hibernate的API文档：

定义组合主键的几种语法：

1、将组件类注解为@Embeddable，并将组件的属性注解为@Id

2、将组件的属性注解为@EmbeddedId

3、将类注解为@IdClass，并将该实体中所有属于主键的属性都注解为@Id

下面就分别使用这三种方式来定义联合主键。

建表的SQL语句：

CREATE TABLE \`syslogs\` (

\`id\` varchar(50) NOT NULL,

\`yhid\` varchar(50) NOT NULL,

\`modelname\` varchar(100) DEFAULT NULL,

\`content\` varchar(500) DEFAULT NULL,

\`inserttime\` varchar(20) DEFAULT NULL,

\`remark\` varchar(50) DEFAULT NULL,

PRIMARY KEY (\`id\`,\`yhid\`)

) ENGINE=InnoDB DEFAULT CHARSET=utf-8;

一、将组件类注解为@Embeddable

/\*\*

\* SysLogsDtoId代表主键类

\*/

package com.hibernate.dto;

import javax.persistence.Embeddable;

/\*\*

\* 1、主键类必须要实现java.io.Serializable接口

\* 2、主键类必须要重写equals和hashCode方法

\* @author ibm

\*/

@Embeddable

public class SysLogsDtoId implements java.io.Serializable \{

private static final long serialVersionUID = 1L;

private String id;

private String yhid;

public SysLogsDtoId() \{

public SysLogsDtoId(String id, String yhid) \{

this.id = id;

this.yhid = yhid;

public String getId() \{

return this.id;

public void setId(String id) \{

this.id = id;

public String getYhid() \{

return this.yhid;

public void setYhid(String yhid) \{

this.yhid = yhid;

public boolean equals(Object other) \{

if ((this == other))

return true;

if ((other == null))

return false;

if (!(other instanceof SysLogsDtoId))

return false;

SysLogsDtoId castOther = (SysLogsDtoId) other;

return ((this.getId() == castOther.getId()) || (this.getId() != null && castOther.getId() != null && this.getId().equals(castOther.getId())))

&& ((this.getYhid() == castOther.getYhid()) || (this.getYhid() != null && castOther.getYhid() != null && this.getYhid().equals(

castOther.getYhid())));

public int hashCode() \{

int result = 17;

result = 37 \* result + (getId() == null ? 0 : this.getId().hashCode());

result = 37 \* result + (getYhid() == null ? 0 : this.getYhid().hashCode());

return result;

/\*\*

\* SysLogsDto为表对象映射类，其中主键为主键类SysLogsDtoId

\*/

package com.hibernate.dto;

import javax.persistence.Column;

import javax.persistence.Entity;

import javax.persistence.Id;

import javax.persistence.Table;

@Entity

@Table(name = "syslogs")

public class SysLogsDto implements java.io.Serializable \{

private static final long serialVersionUID = 1L;

private SysLogsDtoId id;

private String modelname;

private String content;

private String inserttime;

private String remark;

public SysLogsDto() \{

public SysLogsDto(SysLogsDtoId id) \{

this.id = id;

public SysLogsDto(SysLogsDtoId id, String modelname, String content, String inserttime, String remark) \{

this.id = id;

this.modelname = modelname;

this.content = content;

this.inserttime = inserttime;

this.remark = remark;

@Id

public SysLogsDtoId getId() \{

return this.id;

public void setId(SysLogsDtoId id) \{

this.id = id;

@Column(name = "modelname", length = 100)

public String getModelname() \{

return this.modelname;

public void setModelname(String modelname) \{

this.modelname = modelname;

@Column(name = "content", length = 500)

public String getContent() \{

return this.content;

public void setContent(String content) \{

this.content = content;

@Column(name = "inserttime", length = 20)

public String getInserttime() \{

return this.inserttime;

public void setInserttime(String inserttime) \{

this.inserttime = inserttime;

@Column(name = "remark", length = 50)

public String getRemark() \{

return this.remark;

public void setRemark(String remark) \{

this.remark = remark;

二、将组件的属性注解为@EmbeddedId

这种情况最简单，主键类只用定义主键字段，不需要写任何注解。然后在对象类中在主键类的get方法上加上@EmbeddedId注解。

/\*\*

\* SysLogsDtoId代表主键类

\*/

package com.hibernate.dto;

public class SysLogsDtoId implements java.io.Serializable \{

private static final long serialVersionUID = 1L;

private String id;

private String yhid;

public SysLogsDtoId() \{

public SysLogsDtoId(String id, String yhid) \{

this.id = id;

this.yhid = yhid;

public String getId() \{

return this.id;

public void setId(String id) \{

this.id = id;

public String getYhid() \{

return this.yhid;

public void setYhid(String yhid) \{

this.yhid = yhid;

public boolean equals(Object other) \{

if ((this == other))

return true;

if ((other == null))

return false;

if (!(other instanceof SysLogsDtoId))

return false;

SysLogsDtoId castOther = (SysLogsDtoId) other;

return ((this.getId() == castOther.getId()) || (this.getId() != null && castOther.getId() != null && this.getId().equals(castOther.getId())))

&& ((this.getYhid() == castOther.getYhid()) || (this.getYhid() != null && castOther.getYhid() != null && this.getYhid().equals(

castOther.getYhid())));

public int hashCode() \{

int result = 17;

result = 37 \* result + (getId() == null ? 0 : this.getId().hashCode());

result = 37 \* result + (getYhid() == null ? 0 : this.getYhid().hashCode());

return result;

/\*\*

\* SysLogsDto为表对象映射类，其中主键为主键类SysLogsDtoId

\*/

package com.hibernate.dto;

import javax.persistence.Column;

import javax.persistence.EmbeddedId;

import javax.persistence.Entity;

import javax.persistence.Table;

@Entity

@Table(name = "syslogs")

public class SysLogsDto implements java.io.Serializable \{

private static final long serialVersionUID = 1L;

private SysLogsDtoId id;

private String modelname;

private String content;

private String inserttime;

private String remark;

public SysLogsDto() \{

public SysLogsDto(SysLogsDtoId id) \{

this.id = id;

public SysLogsDto(SysLogsDtoId id, String modelname, String content, String inserttime, String remark) \{

this.id = id;

this.modelname = modelname;

this.content = content;

this.inserttime = inserttime;

this.remark = remark;

@EmbeddedId

public SysLogsDtoId getId() \{

return this.id;

public void setId(SysLogsDtoId id) \{

this.id = id;

@Column(name = "modelname", length = 100)

public String getModelname() \{

return this.modelname;

public void setModelname(String modelname) \{

this.modelname = modelname;

@Column(name = "content", length = 500)

public String getContent() \{

return this.content;

public void setContent(String content) \{

this.content = content;

@Column(name = "inserttime", length = 20)

public String getInserttime() \{

return this.inserttime;

public void setInserttime(String inserttime) \{

this.inserttime = inserttime;

@Column(name = "remark", length = 50)

public String getRemark() \{

return this.remark;

public void setRemark(String remark) \{

this.remark = remark;

三、将类注解为@IdClass，并将该实体中所有属于主键的属性都注解为@Id

/\*\*

\* SysLogsDtoId代表主键类

\*/

package com.hibernate.dto;

public class SysLogsDtoId implements java.io.Serializable \{

private static final long serialVersionUID = 1L;

private String id;

private String yhid;

public SysLogsDtoId() \{

public SysLogsDtoId(String id, String yhid) \{

this.id = id;

this.yhid = yhid;

public String getId() \{

return this.id;

public void setId(String id) \{

this.id = id;

public String getYhid() \{

return this.yhid;

public void setYhid(String yhid) \{

this.yhid = yhid;

public boolean equals(Object other) \{

if ((this == other))

return true;

if ((other == null))

return false;

if (!(other instanceof SysLogsDtoId))

return false;

SysLogsDtoId castOther = (SysLogsDtoId) other;

return ((this.getId() == castOther.getId()) || (this.getId() != null && castOther.getId() != null && this.getId().equals(castOther.getId())))

&& ((this.getYhid() == castOther.getYhid()) || (this.getYhid() != null && castOther.getYhid() != null && this.getYhid().equals(

castOther.getYhid())));

public int hashCode() \{

int result = 17;

result = 37 \* result + (getId() == null ? 0 : this.getId().hashCode());

result = 37 \* result + (getYhid() == null ? 0 : this.getYhid().hashCode());

return result;

/\*\*

\* SysLogsDto为表对象映射类，其中主键为主键类SysLogsDtoId

\*/

package com.hibernate.dto;

import javax.persistence.Column;

import javax.persistence.Entity;

import javax.persistence.Id;

import javax.persistence.IdClass;

import javax.persistence.Table;

@Entity

@Table(name = "syslogs")

@IdClass(value=SysLogsDtoId.class)

public class SysLogsDto implements java.io.Serializable \{

private static final long serialVersionUID = 1L;

private String id;

private String yhid;

private String modelname;

private String content;

private String inserttime;

private String remark;

public SysLogsDto() \{

@Id

public String getId() \{

return id;

public void setId(String id) \{

this.id = id;

@Id

public String getYhid() \{

return yhid;

public void setYhid(String yhid) \{

this.yhid = yhid;

@Column(name = "modelname", length = 100)

public String getModelname() \{

return this.modelname;

public void setModelname(String modelname) \{

this.modelname = modelname;

@Column(name = "content", length = 500)

public String getContent() \{

return this.content;

public void setContent(String content) \{

this.content = content;

@Column(name = "inserttime", length = 20)

public String getInserttime() \{

return this.inserttime;

public void setInserttime(String inserttime) \{

this.inserttime = inserttime;

@Column(name = "remark", length = 50)

public String getRemark() \{

return this.remark;

public void setRemark(String remark) \{

this.remark = remark;

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java复合主键注解_java hibernate使用注解来定义联合主键_java_脚本之家

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