Returning values from Nested Tables using JDBC

Posted by Steve Racanovic | Posted in | Posted on 1:25 PM

0

When running a select statement in sqlplus on a nested tables we get the results returned. However the same can not be said when running the same statement through JDBC. He is an example of returning values from a nested table with JDBC.

1. Here's how the sql script looks like to create the type and tables.


drop table person;
drop type nested_addresses;
drop type address;

create or replace type address as object(
street varchar2(50),
city varchar2(20),
postcode varchar2(8),
state varchar(8))
/

create or replace type nested_addresses as table of address
/

create table person (
firstname varchar(20),
lastname varchar(20),
address_list nested_addresses
) nested table address_list store as person_addresses
/

insert into person values ('Fred','Flinstone', nested_addresses(address('345 Cave Stone Road', 'Bedrock', 'BR345','BR'),address('1313 Cobblestone Way', 'Bedville', 'BV1313','BV')))
/

commit
/

2. If I now run the select statement we can see the results:

scott@orcl> set head on feedback on
scott@orcl> set pages 999
scott@orcl> set linesize 120
scott@orcl> col firsname format a20
scott@orcl> col lastname format a20
scott@orcl> col address_list format a50
scott@orcl> select firstname, lastname, address_list from person;

FIRSTNAME LASTNAME ADDRESS_LIST(STREET, CITY, POSTCODE, STATE)
-------------------- -------------------- --------------------------------------------------
Fred Flinstone NESTED_ADDRESSES(ADDRESS('345 Cave Stone Road', 'B
edrock', 'BR345', 'BR'), ADDRESS('1313 Cobblestone
Way', 'Bedville', 'BV1313', 'BV'))


1 row selected.


3. However if I now run the same select query, through a java client using JDBC we will get null values returned.

import java.sql.*;

public class Person {
public static void main(String[] args) throws SQLException, ClassNotFoundException {

// connection parameters
String dbUrl = "jdbc:oracle:thin:@sracanov-au2.au.oracle.com:1522:orcl";
String dbUser = "scott";
String dbPass = "tiger";

// load the driver
Class.forName("oracle.jdbc.driver.OracleDriver");

// create connection
Connection con = DriverManager.getConnection(dbUrl, dbUser, dbPass);

// query the table
Statement s = con.createStatement();
String query = "select firstname, lastname, address_list from person";
ResultSet res = s.executeQuery(query);

// look at the result set
res.next();
System.out.println("First Name: " + res.getString(1));
System.out.println("Last Name: " + res.getString(2));
System.out.println("Address: " + res.getString(3));

// close connection
con.close();
}
}

[sracanov@sracanov-au C]$ java -version
java version "1.6.0_16"
Java(TM) SE Runtime Environment (build 1.6.0_16-b01)
Java HotSpot(TM) Client VM (build 14.2-b01, mixed mode, sharing)

[sracanov@sracanov-au C]$ javac -cp .;"D:\My Contents\My Software\Oracle\JDBC\Drivers\11.2.0.1.0\ojdbc6.jar" Person.java

[sracanov@sracanov-au C]$ java -cp .;"D:\My Contents\My Software\Oracle\JDBC\Drivers\11.2.0.1.0\ojdbc6.jar" Person
First Name: Fred
Last Name: Flinstone
Address: null


This is because we need to get a collection of objects and handle them in java by returning arrays elements. The correct way to return this is:


import java.sql.*;

public class Person1 {
public static void main(String[] args) throws SQLException,
ClassNotFoundException {

// connection parameters
String dbUrl = "jdbc:oracle:thin:@sracanov-au2.au.oracle.com:1522:orcl";
String dbUser = "scott";
String dbPass = "tiger";

// load the driver
Class.forName("oracle.jdbc.driver.OracleDriver");

// create connection
Connection con = DriverManager.getConnection(dbUrl, dbUser, dbPass);

// query the table
Statement s = con.createStatement();
String query = "select firstname, lastname, address_list from person";
ResultSet res = s.executeQuery(query);

// look at the result set
while (res.next()) {
int addresscounter=1;
System.out.println("First Name: " + res.getString(1));
System.out.println("Last Name: " + res.getString(2));
Array array = res.getArray(3);
Object[] address_list = (Object[]) array.getArray();
for (int i = 0; i < address_list.length; i++) {
Struct address = (Struct) address_list[i];
Object[] attrib = address.getAttributes();
for (int j = 0; j < attrib.length; j++) {
System.out.println("Address " + addresscounter + ": " + attrib[j]);
}
addresscounter++;
}
}

// close connection
con.close();
}
}

[sracanov@sracanov-au C]$ javac -cp .;"D:\My Contents\My Software\Oracle\JDBC\Drivers\11.2.0.1.0\ojdbc6.jar" Person1.java

[sracanov@sracanov-au C]$ java -cp .;"D:\My Contents\My Software\Oracle\JDBC\Drivers\11.2.0.1.0\ojdbc6.jar" Person1
First Name: Fred
Last Name: Flinstone
Address 1: 345 Cave Stone Road
Address 1: Bedrock
Address 1: BR345
Address 1: BR
Address 2: 1313 Cobblestone Way
Address 2: Bedville
Address 2: BV1313
Address 2: BV


http://download.oracle.com/docs/cd/E11882_01/java.112/e10589/oraarr.htm#i1059642

Tracing the Bind Values

Posted by Steve Racanovic | Posted in , | Posted on 11:52 AM

0

Created a simple example of how you can isolate and trace the bind variables for the records inserted and understand what to look for in the trace file.

The table here consists of 3 columns. A varchar2, number and timestamp.

The jdev 11113 workspace for this example is here.

When running the application, this following results are displayed:


=============
Java Vendor is ... Sun Microsystems Inc.

Java Version is  1.6.0_18

=============
Database Product Name is ... Oracle

Database Product Version is  Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Production
With the Partitioning, OLAP and Data Mining options

=============
JDBC Driver Name is ........ Oracle JDBC driver

JDBC Driver Version is ..... 11.1.0.7.0-Production

=============
Dropping/Creating table...

 execSQL() returning: 0 for SQL=DROP TABLE SCOTT.BIND_TEST

 execSQL() returning: 0 for SQL=CREATE TABLE SCOTT.BIND_TEST (VARCHAR_FIELD VARCHAR2(50), NO_FIELD NUMBER(2), TIMESTAMP_FIELD TIMESTAMP)
Preparing stmt: INSERT INTO SCOTT.BIND_TEST (VARCHAR_FIELD, NO_FIELD, TIMESTAMP_FIELD) VALUES (?, ?, ?)
Inserting ...
Inserting Complete...
DISPLAY...
test_string_0.8433509446104999 0 2010-05-17 11:35:46.328
test_string_0.32801143775147246 1 2010-05-17 11:35:46.5
test_string_0.6936132181788695 2 2010-05-17 11:35:46.515
test_string_0.4458248593661084 3 2010-05-17 11:35:46.515
test_string_0.8349244238371425 4 2010-05-17 11:35:46.515
test_string_0.014215120763115707 5 2010-05-17 11:35:46.515
test_string_0.7895349187550287 6 2010-05-17 11:35:46.515
test_string_0.33693148690955965 7 2010-05-17 11:35:46.531
test_string_0.60803516417148 8 2010-05-17 11:35:46.531
test_string_0.5201490476224547 9 2010-05-17 11:35:46.531

Show Trace File...
TRACE FILE NAME : /u01/programs/oracle/product/10.2.0/db_1/admin/orcl/udump/orcl_ora_16541.trc


Open the trace file I can see the following:

...
PARSING IN CURSOR #8 len=90 dep=0 uid=5 oct=2 lid=5 tim=1244198234987514 hv=896770016 ad='2b9e3258'
INSERT INTO SCOTT.BIND_TEST (VARCHAR_FIELD, NO_FIELD, TIMESTAMP_FIELD) VALUES (:1, :2, :3)
END OF STMT
PARSE #8:c=2000,e=2579,p=0,cr=0,cu=0,mis=1,r=0,dep=0,og=1,tim=1244198234987507
=====================
PARSING IN CURSOR #12 len=227 dep=1 uid=0 oct=3 lid=0 tim=1244198235054488 hv=2190775527 ad='2f56e994'
select u.name,o.name, t.update$, t.insert$, t.delete$, t.enabled  from obj$ o,user$ u,trigger$ t  where t.baseobject=:1 and t.obj#=o.obj# and o.owner#=u.user#  and bitand(property,16)=0 and bitand(property,8)=0  order by o.obj#
END OF STMT
PARSE #12:c=3000,e=2745,p=0,cr=0,cu=0,mis=1,r=0,dep=1,og=4,tim=1244198235054480
BINDS #12:
kkscoacd
 Bind#0
  oacdty=02 mxl=22(22) mxlc=00 mal=00 scl=00 pre=00
  oacflg=00 fl2=0001 frm=00 csi=00 siz=24 off=0
  kxsbbbfp=b7234fe8  bln=22  avl=04  flg=05
  value=150767
EXEC #12:c=5999,e=73474,p=0,cr=0,cu=0,mis=1,r=0,dep=1,og=4,tim=1244198235128125
FETCH #12:c=0,e=59,p=0,cr=1,cu=0,mis=0,r=0,dep=1,og=4,tim=1244198235128225
STAT #12 id=1 cnt=0 pid=0 pos=1 obj=0 op='SORT ORDER BY (cr=1 pr=0 pw=0 time=103 us)'
STAT #12 id=2 cnt=0 pid=1 pos=1 obj=0 op='NESTED LOOPS  (cr=1 pr=0 pw=0 time=77 us)'
STAT #12 id=3 cnt=0 pid=2 pos=1 obj=0 op='NESTED LOOPS  (cr=1 pr=0 pw=0 time=69 us)'
STAT #12 id=4 cnt=0 pid=3 pos=1 obj=81 op='TABLE ACCESS BY INDEX ROWID TRIGGER$ (cr=1 pr=0 pw=0 time=64 us)'
STAT #12 id=5 cnt=0 pid=4 pos=1 obj=125 op='INDEX RANGE SCAN I_TRIGGER1 (cr=1 pr=0 pw=0 time=35 us)'
STAT #12 id=6 cnt=0 pid=3 pos=2 obj=18 op='TABLE ACCESS BY INDEX ROWID OBJ$ (cr=0 pr=0 pw=0 time=0 us)'
STAT #12 id=7 cnt=0 pid=6 pos=1 obj=36 op='INDEX UNIQUE SCAN I_OBJ1 (cr=0 pr=0 pw=0 time=0 us)'
STAT #12 id=8 cnt=0 pid=2 pos=2 obj=22 op='TABLE ACCESS CLUSTER USER$ (cr=0 pr=0 pw=0 time=0 us)'
STAT #12 id=9 cnt=0 pid=8 pos=1 obj=11 op='INDEX UNIQUE SCAN I_USER# (cr=0 pr=0 pw=0 time=0 us)'
BINDS #8:
kkscoacd
 Bind#0
  oacdty=01 mxl=32(30) mxlc=00 mal=00 scl=00 pre=00
  oacflg=03 fl2=1000010 frm=01 csi=31 siz=68 off=0
  kxsbbbfp=b722aaec  bln=32  avl=30  flg=05
  value="test_string_0.8433509446104999"
 Bind#1
  oacdty=02 mxl=22(22) mxlc=00 mal=00 scl=00 pre=00
  oacflg=03 fl2=1000000 frm=01 csi=31 siz=0 off=32
  kxsbbbfp=b722ab0c  bln=22  avl=01  flg=01
  value=0
 Bind#2
  oacdty=180 mxl=11(11) mxlc=00 mal=00 scl=00 pre=00
  oacflg=03 fl2=1000000 frm=01 csi=31 siz=0 off=56
  kxsbbbfp=b722ab24  bln=11  avl=11  flg=01
  value=
Dump of memory from 0xB722AB24 to 0xB722AB2F
B722AB20          11056E78 132F240C 0000E28C      [xn...$/.....]
EXEC #8:c=12998,e=101172,p=0,cr=2,cu=21,mis=1,r=1,dep=0,og=1,tim=1244198235152633
XCTEND rlbk=0, rd_only=0
...


Here you can see the first insert query references "CURSOR #8" that will bind to "BINDS #8:" which shows the binding values:

value="test_string_0.8433509446104999"
value=0
value=

Timestamp is in hex format. You will to convert that yourself to find the value.

http://wiki.oracle.com/page/Structure+of+an+Extended+SQL+Trace+file