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org.jdbf.engine.keygen
Class KeyKeeper  

java.lang.Object
  org.jdbf.engine.keygen.KeyKeeper

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public class KeyKeeper

extends java.lang.Object

This class provides generated keys. The method is similar to the one called Key-Values by Scott Ambler in Mapping Objects to Relational Databases. With this method, there's a multi-row table which has three columns, one for the identifier for the table name, one for the identifier for the key table and another for the next key value for that table.

Version:

$id$

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Field Summary
private  int	columnType           Represents the tyoe of column of high value
private static int	DATA_TYPE           Represents the sql type for high value
private  org.jdbf.engine.mapping.HighLowMap	hiloMap           The high value is combined with the low value to produce the key.
private  boolean	isUsed           Indicates if KeyKeeper is used
private static int	PROGRESSIVE           Represents the progressive to add the high forn new insert operation
private  java.lang.String	tableName           The key is generated for this table.

 

Constructor Summary

KeyKeeper(java.lang.String tableName, org.jdbf.engine.mapping.HighLowMap hiloMap)           Creates the object given talbe name,given hiloMap

 

Method Summary
private  org.jdbf.engine.mapping.HighLowMap	fetchHigh(java.sql.Connection conn, java.lang.String vendor)           Obtains a block of available keys from the key-values table.
private  int	getColumnType(java.sql.Connection conn, java.lang.String table, java.lang.String column)           Return column's type fo column specified in column parameter.
java.lang.Object	nextKey(java.sql.Connection conn, java.lang.String vendor)           Returns the next generated key.
private  int	updateLow(java.sql.Connection conn, org.jdbf.engine.mapping.HighLowMap hiloMap)           Updates in table where keyGenerators are mapped the new low value specified in table.

 

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

 

Field Detail

DATA_TYPE

private static int DATA_TYPE

Represents the sql type for high value

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PROGRESSIVE

private static int PROGRESSIVE

Represents the progressive to add the high forn new insert operation

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columnType

private int columnType

Represents the tyoe of column of high value

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tableName

private java.lang.String tableName

The key is generated for this table.

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isUsed

private boolean isUsed

Indicates if KeyKeeper is used

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hiloMap

private org.jdbf.engine.mapping.HighLowMap hiloMap

The high value is combined with the low value to produce the key.

Constructor Detail

KeyKeeper

public KeyKeeper(java.lang.String tableName,
                 org.jdbf.engine.mapping.HighLowMap hiloMap)

Creates the object given talbe name,given hiloMap

Method Detail

fetchHigh

private org.jdbf.engine.mapping.HighLowMap fetchHigh(java.sql.Connection conn,
                                                     java.lang.String vendor)
                                              throws org.jdbf.engine.mapping.MappingException

Obtains a block of available keys from the key-values table.

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getColumnType

private final int getColumnType(java.sql.Connection conn,
                                java.lang.String table,
                                java.lang.String column)
                         throws java.sql.SQLException,
                                org.jdbf.engine.mapping.MappingException

Return column's type fo column specified in column parameter.

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nextKey

public java.lang.Object nextKey(java.sql.Connection conn,
                                java.lang.String vendor)
                         throws org.jdbf.engine.mapping.MappingException

Returns the next generated key.

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updateLow

private int updateLow(java.sql.Connection conn,
                      org.jdbf.engine.mapping.HighLowMap hiloMap)
               throws org.jdbf.engine.mapping.MappingException

Updates in table where keyGenerators are mapped the new low value specified in table.

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