Hibernate基本配置：类与表之间的映射关系

浏览数：22 / 时间：2015年06月09日

只介绍用Annotation的方式进行映射关系的配置。

　　1. 如果表名与对象名不一致，则要对表名进行配置。

　　使用@Table

　　2. 如果字段名与属性名不一致。

　　使用@Column

　　3. 不需要persistentence的字段

　　使用@Persistentence

　　4.映射日期与时间类型，指定时间精度

　　使用@Temporal

　　默认会直接记录日期与时分秒，可以进行定制。 @Temporal（TemporalType.?），？可以取3个值，DTAE（只记录日期），TIME（记录时分秒），TIMESTAMP（日期与时分秒都记录）。

　　5.映射枚举类型

　　使用@Enumerated

　　@Enumerated（EnumType.?）。？可取STRING、ORIDINAL,STRING表示在数据库中将以string进行储存，直接会储存枚举值。ORIDINAL表示将以数字进行储存，数字为该枚举值在枚举类型定义中所对应的位置。

　　范例：

Java代码  

@Entity  

　　@Table（name="_teacher"）  

　　public class Teacher {  

　　private int id;  

　　private String name;  

　　private String title;  

　　private String yourWifeName;  

　　private Date birthDate;  

　　private boolean good;  

　　private Gender gender;  

　　@Enumerated（EnumType.STRING）  

　　public Gender getGender（） {  

　　return gender;  

　　}  

　　public void setGender（Gender gender） {  

　　this.gender = gender;  

　　}  

　　public boolean isGood（） {  

　　return good;  

　　}  

　　public void setGood（boolean good） {  

　　this.good = good;  

　　}  

　　@Transient  

　　public String getYourWifeName（） {  

　　return yourWifeName;  

　　}  

　　public void setYourWifeName（String yourWifeName） {  

　　this.yourWifeName = yourWifeName;  

　　}  

　　@Id  

　　public int getId（） {  

　　return id;  

　　}  

　　public void setId（int id） {  

　　this.id = id;  

　　}  

　　public String getName（） {  

　　return name;  

　　}  

　　public void setName（String name） {  

　　this.name = name;  

　　}  

　　public String getTitle（） {  

　　return title;  

　　}  

　　public void setTitle（String title） {  

　　this.title = title;  

　　}  

　　@Temporal（TemporalType.TIME）  

　　public Date getBirthDate（） {  

　　return birthDate;  

　　}  

　　public void setBirthDate（Date birthDate） {  

　　this.birthDate = birthDate;  

　　}  

　　}  

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