Column Class
NPersistence Reference Guide
Is used to specify the mapped column for a persistent property or field. If no Column annotation is specified, the default values apply.

Examples

CopyC#
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; }

Namespace: NPersistence
Assembly: NPersistence (in NPersistence.dll) Version: 2.0.0.0 (2.0.0.0)

Syntax

   
 C# 
public class Column : Attribute

Members

         
 All Members  Constructors   Fields  
 Public

 Protected
 Instance

 Static 
 Declared

 Inherited
 XNA Framework Only 

 .NET Compact Framework Only 

 MemberDescription
Column()()()()
Initializes a new instance of the Column class
ColumnDefinition
(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
(Optional) Whether the column is included in SQL INSERT statements generated by the persistence provider.
Length
(Optional) The column length. (Applies only if a string-valued column is used.)
Name
(Optional) The name of the column. Defaults to the property or field name.
Nullable
(Optional) Whether the database column is nullable.
Precision
(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
(Optional) The scale for a decimal (exact numeric) column. (Applies only if a decimal column is used.)
Table
(Optional) The name of the table that contains the column. If absent the column is assumed to be in the primary table.
Unique
(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.
Updatable
(Optional) Whether the column is included in SQL UPDATE statements generated by the persistence provider.

Inheritance Hierarchy

System..::..Object
  System..::..Attribute
    NPersistence..::..Column
      NPersistence..::..AttributeOverride

See Also