Class MaxKeyGenerator
- java.lang.Object
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- org.castor.cpa.persistence.sql.keygen.AbstractKeyGenerator
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- org.castor.cpa.persistence.sql.keygen.AbstractBeforeKeyGenerator
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- org.castor.cpa.persistence.sql.keygen.MaxKeyGenerator
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- All Implemented Interfaces:
KeyGenerator
public final class MaxKeyGenerator extends AbstractBeforeKeyGenerator
MAX key generators.- Version:
- $Revision$ $Date: 2006-04-25 15:08:23 -0600 (Tue, 25 Apr 2006) $
- Author:
- Oleg Nitz, Leonardo Souza Mario Bueno, Bruce Snyder, Ralf Joachim
- See Also:
MaxKeyGeneratorFactory
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Constructor Summary
Constructors Constructor Description MaxKeyGenerator(PersistenceFactory factory, int sqlType)
Initialize the MAX key generator.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description java.lang.Object
generateKey(java.sql.Connection conn, java.lang.String tableName, java.lang.String primKeyName)
Generate a new key for the specified table as "MAX(primary_key) + 1".boolean
isInSameConnection()
Is key generated in the same connection as INSERT? For DURING_INSERT style this method is never called.-
Methods inherited from class org.castor.cpa.persistence.sql.keygen.AbstractBeforeKeyGenerator
bindIdentity, buildStatement, executeStatement
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Methods inherited from class org.castor.cpa.persistence.sql.keygen.AbstractKeyGenerator
closeSeparateConnection, getSeparateConnection
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Constructor Detail
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MaxKeyGenerator
public MaxKeyGenerator(PersistenceFactory factory, int sqlType) throws MappingException
Initialize the MAX key generator.- Parameters:
factory
- A PersistenceFactory instance.sqlType
- A SQLTypidentifier.- Throws:
MappingException
- if this key generator is not compatible with the persistance factory.
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Method Detail
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generateKey
public java.lang.Object generateKey(java.sql.Connection conn, java.lang.String tableName, java.lang.String primKeyName) throws PersistenceException
Generate a new key for the specified table as "MAX(primary_key) + 1". If there is no records in the table, then the value 1 is returned.
Generate a new key for the specified table. This method is called when a new object is about to be created. In some environments the name of the owner of the object is known, e.g. the principal in a J2EE server. This method is never called for DURING_INSERT key generators.- Parameters:
conn
- An open connection within the given transactiontableName
- The table nameprimKeyName
- The primary key name- Returns:
- A new key
- Throws:
PersistenceException
- An error occured talking to persistent storage
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isInSameConnection
public boolean isInSameConnection()
Is key generated in the same connection as INSERT? For DURING_INSERT style this method is never called.- Returns:
- {code}True{code} If this instance is in same JDBC Connection.
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