nulls from java api

[Stephen Withers]

Can you please tell me what values are used for null for the various datatypes when calling from c.java?

[Ryan Hamilton]

A special NULL function can be used to create kdb “null” values in the java api:

Kdb+ type	Kdb+ null accessor	Java null
Boolean	NULL(‘b’)	Boolean(false)
Byte	NULL(‘x’)	Byte(byte() 0)
Short	NULL(‘h’)	Short(Short.MIN_VALUE)
Integer	NULL(‘i’)	Integer(Integer.MIN_VALUE)
Long	NULL(‘j’)	Long(Long.MIN_VALUE)
Float	NULL(‘e’)	Float(Double.NaN)
Double	NULL(‘f’)	Double(Double.Nan)
Character	NULL(‘c’)	Character(‘ ‘)
String	NULL(‘s’)	“”
Month	NULL(‘m’)	Month(Integer.MIN_VALUE)
Date	NULL(‘d’)	Date(Integer.MIN_VALUE)
DataTime/java.util.Date	NULL(‘z’)	Timestamp(Long.MIN_VALUE)
Minute	NULL(‘u’)	Minute(Integer.MIN_VALUE)
Second	NULL(‘v’)	Second(Integer.MIN_VALUE)
Time	NULL(‘t’)	Time(Integer.MIN_VALUE)

Source: http://code.kx.com/wiki/Cookbook/InterfacingWithJava#Creating_null_values

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