Hibernate基本配置：类与表之间的映射关系

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  

  1. @Entity
  2. 　　@Table（name="_teacher"）
  3. 　　public class Teacher {
  4. 　　private int id;
  5. 　　private String name;
  6. 　　private String title;
  7. 　　private String yourWifeName;
  8. 　　private Date birthDate;
  9. 　　private boolean good;
  10. 　　private Gender gender;
  11. 　　@Enumerated（EnumType.STRING）
  12. 　　public Gender getGender（） {
  13. 　　return gender;
  14. 　　}
  15. 　　public void setGender（Gender gender） {
  16. 　　this.gender = gender;
  17. 　　}
  18. 　　public boolean isGood（） {
  19. 　　return good;
  20. 　　}
  21. 　　public void setGood（boolean good） {
  22. 　　this.good = good;
  23. 　　}
  24. 　　@Transient
  25. 　　public String getYourWifeName（） {
  26. 　　return yourWifeName;
  27. 　　}
  28. 　　public void setYourWifeName（String yourWifeName） {
  29. 　　this.yourWifeName = yourWifeName;
  30. 　　}
  31. 　　@Id
  32. 　　public int getId（） {
  33. 　　return id;
  34. 　　}
  35. 　　public void setId（int id） {
  36. 　　this.id = id;
  37. 　　}
  38. 　　public String getName（） {
  39. 　　return name;
  40. 　　}
  41. 　　public void setName（String name） {
  42. 　　this.name = name;
  43. 　　}
  44. 　　public String getTitle（） {
  45. 　　return title;
  46. 　　}
  47. 　　public void setTitle（String title） {
  48. 　　this.title = title;
  49. 　　}
  50. 　　@Temporal（TemporalType.TIME）
  51. 　　public Date getBirthDate（） {
  52. 　　return birthDate;
  53. 　　}
  54. 　　public void setBirthDate（Date birthDate） {
  55. 　　this.birthDate = birthDate;
  56. 　　}
  57. 　　}
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