@Target(value={METHOD,FIELD}) @Retention(value=RUNTIME) public @interface Column
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; }
Modifier and Type | Optional Element and Description |
---|---|
String |
columnDefinition
(Optional) The SQL fragment that is used when
generating the DDL for the column.
|
boolean |
insertable
(Optional) Whether the column is included in SQL INSERT
statements generated by the persistence provider.
|
int |
length
(Optional) The column length.
|
String |
name
(Optional) The name of the column.
|
boolean |
nullable
(Optional) Whether the database column is nullable.
|
int |
precision
(Optional) The precision for a decimal (exact numeric)
column.
|
int |
scale
(Optional) The scale for a decimal (exact numeric) column.
|
String |
table
(Optional) The name of the table that contains the column.
|
boolean |
unique
(Optional) Whether the column is a unique key.
|
boolean |
updatable
(Optional) Whether the column is included in SQL UPDATE
statements generated by the persistence provider.
|
public abstract String name
public abstract boolean unique
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.public abstract boolean nullable
public abstract boolean insertable
public abstract boolean updatable
public abstract String columnDefinition
Defaults to the generated SQL to create a column of the inferred type.
public abstract String table
public abstract int length
Copyright © 2016 JBoss by Red Hat. All rights reserved.