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  /*
   * Copyright (c) 2008, 2009 Sun Microsystems. All rights reserved.
   *
   * This program and the accompanying materials are made available under the
   * terms of the Eclipse Public License v1.0 and Eclipse Distribution License v. 1.0
   * which accompanies this distribution.
   * The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html
   * and the Eclipse Distribution License is available at
   * http://www.eclipse.org/org/documents/edl-v10.php.
  *
  * Contributors:
  *     Linda DeMichiel - Java Persistence 2.0 - Version 2.0 (October 1, 2009)
  *     Specification available from http://jcp.org/en/jsr/detail?id=317
  */
 
 // $Id: Column.java 20957 2011-06-13 09:58:51Z stliu $
 
 package javax.persistence;
 
 import static java.lang.annotation.ElementType.METHOD;
 import static java.lang.annotation.ElementType.FIELD;
 import static java.lang.annotation.RetentionPolicy.RUNTIME;

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; }

 

Since:
Java Persistence 1.0
 
 public @interface Column {

    
(Optional) The name of the column. Defaults to the property or field name.
 
     String name() default "";

    
(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.
 
     boolean unique() default false;

    
(Optional) Whether the database column is nullable.
 
     boolean nullable() default true;

    
(Optional) Whether the column is included in SQL INSERT statements generated by the persistence provider.
 
     boolean insertable() default true;

    
(Optional) Whether the column is included in SQL UPDATE statements generated by the persistence provider.
 
     boolean updatable() default true;

    
(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.

 
     String columnDefinition() default "";

    
(Optional) The name of the table that contains the column. If absent the column is assumed to be in the primary table.
    String table() default "";

    
(Optional) The column length. (Applies only if a string-valued column is used.)
    int length() default 255;

    
(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.
    int precision() default 0;

    
(Optional) The scale for a decimal (exact numeric) column. (Applies only if a decimal column is used.)
    int scale() default 0;
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