A composite primary key with two KeyField: a rope and a sequential int.

Hi all

According to [url http://download.oracle.com/docs/cd/E17277_02/html/java/com/sleepycat/persist/model/PrimaryKey.html#sequence ()] sequence JavaDoc: a composite key class can also be used to substitute the sort order, but it can contain only a single key field which has one of the types mentioned previously.

We strive to create a composite PK as follows:
@Persistent
public class ExamplePK {
    @KeyField(1) Integer seq;
    @KeyField(2) String admon;

    public String getAdmon() {
        return admon;
    }

    public void setAdmon(final String admon) {
        this.admon = admon;
    }
      public Integer getSeq() {
      return seq;
    }
      public void setSeq(final Integer seq) {
      this.seq = seq;
    }
}

@Entity
public class ExamplePojo {

    // Relational fields
    @PrimaryKey(sequence="ExampleSeq")
    private ExamplePK idExample;

    public ExamplePK getIdExample() {
        return idExample;
    }

    public void setIdExample(final ExamplePK idExample) {
        this.idExample = idExample;
    }
}
but we get the following exception:
java.lang.IllegalArgumentException:A composite key class used with a sequence may contain only a single integer key field: es.correos.ape.dao.notification.pojo.ExamplePK[Server1:1291138230743]
      at com.sleepycat.persist.impl.CompositeKeyFormat.getSequenceKeyFormat(CompositeKeyFormat.java:292)
      at com.sleepycat.persist.impl.PersistKeyAssigner.<init>(PersistKeyAssigner.java:39)
      at com.sleepycat.persist.impl.Store.getPrimaryIndex(Store.java:337)
      at com.sleepycat.persist.EntityStore.getPrimaryIndex(EntityStore.java:307)
What we're doing wrong?

ARO
/ Caesar.

Caesar, I think that the wording of the javadoc and exception message is incorrect or at least confused, and I answer key for a future version.

-mark

Tags: Database

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WARD               30       1981 22-Feb-1981          2
BLAKE              30       1981 01-May-1981          3
TURNER             30       1981 08-Sep-1981          4
MARTIN             30       1981 28-Sep-1981          5
JAMES              30       1981 03-Dec-1981          6

  • Aggregation based on composite primary keys

    Hello

    I have a coherence cache which stores complex Java objects in the form of values in which I have to perform aggregation (County based on a composite primary key in the object). The key for the cache's UUID.
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          "getB"),new ReflectionExtractor(
          "getC")};
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                    .createInstance(
                              chExtractor,
                              CompositeAggregator.Parallel
                                        .createInstance(new InvocableMap.EntryAggregator[] { new Count() }));
    Obviously something is wrong, but I get the exception:
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    When I do this for the aggregation based on a single property say a or b or c, the aggregation works very well:
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                    .createInstance(
                              "getB",
                              CompositeAggregator.Parallel
                                        .createInstance(new InvocableMap.EntryAggregator[] { new Count() }));
    with the result
    y1 -> 4
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    The expected result for Aggregetion based on several properties:
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A | B | C | D |                 x1,y1,z1  -> 2
x1|y1|z1|Desc1|               x2,y1,z1 -> 1
x2|y1|z1|Desc2|               x3,y1,z2 -> 1
x1|y1|z1|Desc3|
x3|y1|z2|Desc4|
    Can anyone comment on how to get the aggregate first? And also if the way I am using the extractor chained is correct.

    Thanks in advance
    Vikas

    Edited by: vikascv January 6, 2010 17:59

    I think you want to use a MultiExtractor who will then produce a table of the elements of the composite key on which you can then aggregate. This means that the array of items produced key can be properly evaluated for equality.

    If not, write a custom ValueExtractor which returns a single object (can be a concatenated string or a key object with equals/hashcode).

    Regards, Paul

  • How to define a Composite primary key for a Table

    Hello

    I'm basically more in Java programming, with little knowledge of Oracle bit as DataBase .so please sorry for my silly doubts.

    Can someone tell me please how to define a Composite primary key on a Table.

    Thanks in advance.

    Published by: user672373773 on 25 Sep, 2009 08:54

    Please go through these links:

    http://plsqlworld.blogspot.com/2009/01/oracleplsql-composite-primary-key.html

    http://sqlzoo.NET/HOWTO/source/z.dir/tip241027/Oracle

    Concerning
    Asif Kabir

    -Mark the response as correct/good

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  • identification of composite primary keys

    Hi mates,

    I am trying to identify a unique value in a particular table, so then I tried to look for the primary key of the table constraints:

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    OWNER CONSTRAINT_NAME, CONSTRAINT_TYPE INDEX_NAME
    ------------------------------ ------------------------------ --------------- ------------------------------
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    ------------------------------ ------------------------------ ------------------------------ --------------------------------------------------
    VVP PK_CARD_TRANSACTIONS CARD_TRANSACTIONS CARD 4
    VVP PK_CARD_TRANSACTIONS CARD_TRANSACTIONS METER 3
    VVP PK_CARD_TRANSACTIONS CARD_TRANSACTIONS 2 OPERATION
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    I understand that in a single table, we have only 1 PK only. It is a composite primary key? I expected to see 1 single value, and then he showed me 4.


    Thanks in advance.

    Published by: BSalesRashid on 06/29/2012 07:58

    It is a Composite key, you can see the column in position to observe order in the Composite key.

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    Ahmer

    Published by: Ahmer Mansoor on June 29, 2012 20:02

  • A composite primary key column cannot be null

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    It will be a silly question, but still, I would like to ask if a composite primary key column can be null?


    Thank you
    Rafi.

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    SQL> drop table test purge;
drop table test purge
           *
ERROR at line 1:
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SQL> create table test as select * from dba_objects;

Table created.

SQL> alter table test add primary key(object_id, owner);

Table altered.

SQL> insert into test(object_id, owner) values(null, 'aman');
insert into test(object_id, owner) values(null, 'aman')
                                          *
ERROR at line 1:
ORA-01400: cannot insert NULL into ("SYS"."TEST"."OBJECT_ID")

SQL> insert into test(object_id, owner) values(1,null);
insert into test(object_id, owner) values(1,null)
                                            *
ERROR at line 1:
ORA-01400: cannot insert NULL into ("SYS"."TEST"."OWNER")

SQL>

    HTH
    Aman...

  • disable the primary key with waterfall

    Hello everyone,

    I just want to know
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------------------------------ ---------
T_PK                           UNIQUE
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no rows selected.

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Table altered.

SQL> select index_name, uniqueness from user_indexes where table_name = 'T'
/
INDEX_NAME                     UNIQUENES
------------------------------ ---------
T_PK                           UNIQUE
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SQL> drop table t
/
Table dropped.

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