Basic mapping

Use a Basic Mapping to map an attribute directly to a database column. Basic mappings may be used only with the following attribute types:

• Java primitive types and wrappers of the primitive types

• java.lang.String, java.math.BigInteger

• java.math.BigDecimal

• java.util.Date

• java.util.Calendar, java.sql.Date

• java.sql.Time

• java.sql.Timestamp

• byte[]

• Byte[]

• char[]

• Character[]

• enums

• any other type that implements Serializable

To create a basic mapping:

1. In the JPA Structure view, select the field to map. The JPA Details view (for attributes) displays the properties for the selected field.

2. In the Map As field, select Basic.

3. Use this table to complete the remaining fields on the JPA Details view.

   Property	Description	Default
   Map As	Defines this mapping as a Basic Mapping. This field corresponds to the @Basic annotation.	Basic
   Column	The database column mapped to the entity attribute. See "Column" for details. Name – Name of the database column. Table – Name of the database table. Insertable – Specify if the column is always included in SQL INSERT statements. Updatable – Specify if the column is always included in SQL UPDATE statements.	By default, the Column is assumed to be named identically to the attribute and always included in the INSERT and UPDATE statements.
   Table	Name of the database table.
   Fetch	Defines how data is loaded from the database. See "Fetch Type" for details. Eager Lazy	Eager
   Optional	Specifies if this field is can be null.	Yes
   Lob	Specifies if this is a large objects (BLOB or CLOB). See "Lob" for details.
   Temporal	Specifies the type of data. See "Temporal" for details. Date Time Timestamp

   
   

Eclipse adds the following annotations to the field:

@Column(name="<COLUMN_NAME>", table="<COLUMN_TABLE>", 
    insertable=<INSERTABLE>, updatable=<UPDATABLE>)
@Basic(fetch=FetchType.<FETCH_TYPE>, optional = <OPTIONAL>)
@Temporal(TemporalType.<TEMPORAL>)

 

Mapping an entity

 

JPA Structure view
JPA Details view (for attributes)

 

Understanding OR mappings
Understanding EJB 3.0 Java Persistence API