org.apache.ojb.broker.metadata
Interface FieldType

All Superinterfaces:

java.io.Serializable

All Known Implementing Classes:

org.apache.ojb.broker.metadata.FieldTypeClasses.BaseFieldType

public interface FieldType

extends java.io.Serializable

OJB implements the mapping conventions for JDBC as specified by the JDBC 3.0 specification and this class representing the jdbc java types of the sql types mappings - e.g. VARCHAR --> String, NUMERIC --> BigDecimal (see JDBC 3.0 specification Appendix B, Data Type Conversion Tables).

We differ two types of fields, immutable (like Integer, Long, String, ...) and mutable (like Date, byte[], most SQL3 datatypes, ...).

Version:

$Id: FieldType.java 365232 2005-12-21 22:36:07Z tomdz $

Method Summary

java.lang.Object	copy(java.lang.Object fieldValue) Returns a copy of the specified persistent class field (e.g.
boolean	equals(java.lang.Object firstValue, java.lang.Object secondValue) Returns true if the field value hasn't changed.
int	getSqlType() Returns the sql Types of this field.
boolean	isMutable() Returns true if the field type is mutable, e.g.
void	setSqlType(JdbcType jdbcType) Dets the associated sql field type of this field.

Method Detail

copy

public java.lang.Object copy(java.lang.Object fieldValue)

Returns a copy of the specified persistent class field (e.g. Long, Integer,...).
NOTE: The specified field value

Parameters:

fieldValue - The field to copy.

Returns:

A copy of the field or the same instance if copying is not possible. Depends on the implementation.

equals

public boolean equals(java.lang.Object firstValue,
                      java.lang.Object secondValue)

Returns true if the field value hasn't changed.

Parameters:

firstValue - A field value object.

secondValue - A field value object.

Returns:

true if the field value hasn't changed.

getSqlType

public int getSqlType()

Returns the sql Types of this field.

setSqlType

public void setSqlType(JdbcType jdbcType)

Dets the associated sql field type of this field.

Parameters:

jdbcType - The associated JdbcType.

isMutable

public boolean isMutable()

Returns true if the field type is mutable, e.g. a jdbc BLOB field or jdbc TIMESTAMP field.

Returns: