Hibernate field names and properties

Field name and property name are the same

Annotation: Default is @basic

Note: If no annotations are added to the member properties, the default is to precede the @Basic

Do not write column in XML

Field name and property name are different

Annotation: Annotate with @Column (name= "ColumnName")

For example:

*@Entity indicates that the following teacher is an entity class* @Table represents a table name that is mapped to a data table, where the name parameter represents"Table name"*@Column represents the field name in the Entity class Member property mapping data table, where the name parameter specifies a new field name*@Id represents the primary key Id*/@Entity @Table (name="_teacher")       Public classTeacher {Private intID; PrivateString name; PrivateString title; //set Primary key using @id@Id Public intgetId () {returnID; } @Column (Name="_name")//field names are not the same as properties         PublicString GetName () {returnname; } ...

Xml:

1. <property name= "name" column= "_name"/>
   

fields that do not require (persist) Psersistence

Is that a member property of a non-entity class does not need to be stored in the database

Annotation: Use the @Transient to annotate it.

For example:

     @Transient          public  String getTitle () {              return  title;      }  

XML: Do not write (that is, you do not need to map this member property) mapping date and time types, specifying time precision

Annotation: Use the @Temporal (value=temporaltype) to annotate annotations that represent dates and times

Where Temporaltype has three values: Temporaltype.timestamp represents YYYY-MM-DD HH:mm:ss

Temporaltype.date says YYYY-MM-DD

Temporaltype.time says HH:MM:SS

     @Temporal (value=temporaltype.date)          public  DATE getbirthdate () {              return  birthDate;      

Note: When using annotations, this property name can be omitted when the property is value, for example:@Temporal (Temporaltype)

XML: Use the Type property to specify the hibernate type

     <property name="birthDate" type="date"

Note: Hibernate datetime types are: date, time, timestamp, and of course you can also use the Java wrapper class

Mapping enumeration types

Annotation: Use the @Enumerated (value=enumtype) to annotate this member property to map the enumeration to the database

Where Enumtype has two values: ①enumtype.string indicates that the enumeration name is stored directly in the database

②enumtype.ordinal indicates that the value corresponding to the enumeration is stored in the database

XML: Mapping is very troublesome, first define a custom type, and then use the type of the definition ...

Http://blog.sina.com.cn/s/blog_4979ec3e01016y0o.html

Hibernate field names and properties