How to get precision of BigDecimal type data in an @Entity class

Question

I have an @Entity class in which there is an instance like this

@Column(name="some_column_in_table", precision=3, scale=1)
    private BigDecimal someColumnInTable;

How can I get precision of that instance?

Could You explain exactly what do You want? The annotation states, what is the precision of the column in the DB. You want the instance of BigDecimal precision? — maslan, Jan 21 '15 at 09:59
Yes the annotatio says its precision is 3, but how can I check this with code? — वरुण, Jan 21 '15 at 10:09

score 1 · Answer 1 · answered Jan 21 '15 at 09:55

1

I'm not quite sure if i got your problem correctly, but have you tried

 someColumnInTable.precision()

as told by the BigDecimal JavaDoc?

answered Jan 21 '15 at 09:55

Steffen

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Yes I tried this. This return precision of value stored in the instance of BigDecimal. This does not work. – वरुण Jan 21 '15 at 10:10

score 1 · Accepted Answer · edited May 23 '17 at 11:50

1

http://docs.oracle.com/javaee/5/api/javax/persistence/Column.html If You just want to programatically get the value set in the annotation, You can do it. The retention for Column is set to RUNTIME, so using Reflection it is possible.

Field f = MyClass.class.getDeclaredField("someColumnInTable")) { 
Column column = f.getAnnotation(Column.class);
if (column != null){
   System.out.println(column.precision());
}

Here are some other examples how to do it: Is it possible to read the value of a annotation in java?

edited May 23 '17 at 11:50

Community

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1

answered Jan 21 '15 at 10:05

maslan

2,078
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MyClass.class.getFields() is returning empty list of fields. – वरुण Jan 21 '15 at 10:23
When I used `MyClass.class.getField("someColumnInTable");` It throws NoSuchFieldException. – वरुण Jan 21 '15 at 10:27
1

@Varun sorry, it's private, use getDeclaredField instead (edited) – maslan Jan 21 '15 at 11:08

How to get precision of BigDecimal type data in an @Entity class

2 Answers2