JPA Annotation

Column

Target: METHOD, FIELD
Implemented Interfaces:
Annotation
Specifies the mapped column for a persistent property or field. If no Column annotation is specified, the default values apply. 
Example 1:
    @Column(name="DESC", nullable=false, length=512)
    public String getDescription() { return description; }
Example 2:
    @Column(name="DESC",
            columnDefinition="CLOB NOT NULL",
            table="EMP_DETAIL")
    @Lob
    public String getDescription() { return description; }
Example 3:
    @Column(name="ORDER_COST", updatable=false, precision=12, scale=2)
    public BigDecimal getCost() { return cost; }
 
Since:
JPA 1.0
Public Annotation Attributes
String columnDefinition default ""
 (Optional) The SQL fragment that is used when generating the DDL for the column.
 
 Defaults to the generated SQL to create a column of the inferred type. 
Since:
JPA 1.0
boolean insertable default true
 (Optional) Whether the column is included in SQL INSERT statements generated by the persistence provider.
 
Since:
JPA 1.0
int length default 255
 (Optional) The column length.
 (Applies only if a string-valued column is used.) 
Since:
JPA 1.0
String name default ""
 (Optional) The name of the column.
 Defaults to the property or field name. 
Since:
JPA 1.0
boolean nullable default true
 (Optional) Whether the database column is nullable.
 
Since:
JPA 1.0
int precision default 0
 (Optional) The precision for a decimal (exact numeric) column.
 (Applies only if a decimal column is used.) Value must be set by developer if used when generating the DDL for the column. 
Since:
JPA 1.0
int scale default 0
 (Optional) The scale for a decimal (exact numeric) column.
 (Applies only if a decimal column is used.) 
Since:
JPA 1.0
String table default ""
 (Optional) The name of the table that contains the column.
 If absent the column is assumed to be in the primary table. 
Since:
JPA 1.0
boolean unique default false
 (Optional) Whether the column is a unique key.
 This is a shortcut for the UniqueConstraint annotation at the table level and is useful for when the unique key constraint corresponds to only a single column. This constraint applies in addition to any constraint entailed by primary key mapping and to constraints specified at the table level. 
Since:
JPA 1.0
boolean updatable default true
 (Optional) Whether the column is included in SQL UPDATE statements generated by the persistence provider.
 
Since:
JPA 1.0