A small tip to generate more meaningful Id. Instead of 32 for OrderID use O000000032.

Use smart and meaningful ids

Simple implementations:

• SmartIdTableGenerator
• SmartIdSequenceGenerator

SmartIdTableGenerator

simple Table Generator Based SmartID generator. it extends TableGenerator and simply returns the formatted value. you can use format parameter for format option

public class SmartIdTableGenerator
extends org.hibernate.id.TableGenerator{

private DecimalFormat format;
/**read configuration parameters*/
@Override
public void configure(
Type type, Properties params, Dialect dialect) {
super.configure( type,  params,  dialect);

String formatPattern = params.getProperty("format");
if(formatPattern!=null)
format=new DecimalFormat(formatPattern);
}
/**get super value and format it*/
@Override
public synchronized Serializable generate(
SessionImplementor session, Object object)
throws HibernateException {
Serializable generated = super.generate(session, object);
String v=null;

if(generated instanceof Number){
if(format!=null)
v=format.format(generated);
else
v=String.valueOf(generated);
}else
v=(String) generated;

return v;
}
}

Usage:

@Entity
public class SimpleTableWithFormatPO {

@Id
@Column(name = "id", precision = 32)
@GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "SmartIdTableGenerator")
@GenericGenerator(name = "SmartIdTableGenerator", strategy = "com.altuure.smartid.SmartIdTableGenerator",
parameters = {@Parameter(name = "format", value = "LD0000000")})
private String id;

SmartIdSequenceGenerator

simple SequenceGenerator Based SmartID generator. it extends SequenceGenerator and simply returns the formatted value
use format parameter for format option

public class SmartIdSequenceGenerator extends org.hibernate.id.SequenceGenerator{

private DecimalFormat format;
public void configure(Type type, Properties params, Dialect dialect) {
super.configure( type,  params,  dialect);

String formatPattern = params.getProperty("format");
if(formatPattern!=null)
format=new DecimalFormat(formatPattern);
}
/**get super value and format it*/
@Override
public synchronized Serializable generate(SessionImplementor session, Object object)
throws HibernateException {
Serializable generated = super.generate(session, object);
String v=null;
// since the type of id is String hibernate returns Long.toString() Value
if(generated instanceof String)
generated=Long.parseLong((String)generated);
if(generated instanceof Number){
if(format!=null)
v=format.format(generated);
else
v=String.valueOf(generated);
}else
v=(String) generated;

return v;
}

}

Usage:

@Entity
public class SimpleSequenceWithFormatPO {

@Id
@Column(name = "id", precision = 32)
@GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "SmartIdSequenceGenerator")
@GenericGenerator(name = "SmartIdSequenceGenerator", strategy = "com.altuure.smartid.SmartIdSequenceGenerator",
parameters = {@Parameter(name = "format", value = "LD0000000")})
private String id;
//...
}

You can extend this implementations and add time variables,system variables or other variables as your data structure needs

eg:

• LD200902000006
• LDServerTitan00006

Sample Code
have fun

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1. hibernate native Id generator tip
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3. hibernate native id generator bug 3.2.4-ga
4. who needs implementations?
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