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Java Source Code / Java Documentation » Database ORM » toplink » javax.persistence 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


javax.persistence.Column

Column
public @interface Column(Code)
Is used to specify a mapped column for a persistent property or field. If no Column annotation is specified, the default values are applied.

Examples:

 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


Field Summary
 StringcolumnDefinition
     (Optional) The SQL fragment that is used when generating the DDL for the column.
 booleaninsertable
     (Optional) Whether the column is included in SQL INSERT statements generated by the persistence provider.
 intlength
     (Optional) The column length.
 Stringname
     (Optional) The name of the column.
 booleannullable
     (Optional) Whether the database column is nullable.
 intprecision
     (Optional) The precision for a decimal (exact numeric) column.
 intscale
     (Optional) The scale for a decimal (exact numeric) column.
 Stringtable
     (Optional) The name of the table that contains the column.
 booleanunique
     (Optional) Whether the property is a unique key.
 booleanupdatable
     (Optional) Whether the column is included in SQL UPDATE statements generated by the persistence provider.



Field Detail
columnDefinition
String columnDefinition(Code)
(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.




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



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



name
String name(Code)
(Optional) The name of the column. Defaults to the property or field name.



nullable
boolean nullable(Code)
(Optional) Whether the database column is nullable.



precision
int precision(Code)
(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.



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



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



unique
boolean unique(Code)
(Optional) Whether the property 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 is only a single field. This constraint applies in addition to any constraint entailed by primary key mapping and to constraints specified at the table level.



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





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