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@Target(value={METHOD,FIELD}) @Retention(value=RUNTIME) public @interface Column
Is used to specify 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; }
Optional Element Summary | |
---|---|
java.lang.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. |
java.lang.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. |
java.lang.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 java.lang.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 java.lang.String columnDefinition
Defaults to the generated SQL to create a column of the inferred type.
public abstract java.lang.String table
public abstract int length
public abstract int precision
public abstract int scale
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Generated on 10-February-2011 12:41