IEEE Day 2013 Oracle Database 12c: new features for developers

IEEE Day 2013
Ramin Orujov
ICT/Internal Applications Team Head
Azercell Telecom
SCJP 6, OCE Java EE 6 WCD
www.linkedin.com/in/raminorujov
01 October 2013, Qafqaz University
Oracle database 12c:
New features for
developers

About me
Senior software developer
Internal Applications Team Head@Azercell
Teacher @ Qafqaz University CE dept.
Co-manager of AZEROUG
Founder and manager of AZERJUG
October 1, 20132

Oracle database platforms
Oracle 9i – internet
Oracle 10g/11g – grid
Oracle 12c - cloud
http://www.oracle.com/us/products/databas
http://www.oracle.com/technetwork/databas
October 1, 20133

SQL new features
 SEQUENCE as default column value
 IDENTITY column
 VARCHAR2, NVARCHAR2 32K limit
 LIMIT, OFFSET support for paging
 Invisible column support
 Inline PL/SQL function within SQL
WITH expression
October 1, 20134

SEQUENCE as default col value
create sequence test_seq
start with 1
increment by 1;
create table test_table(
id number default test_seq.nextval
primary key
);
http://docs.oracle.com/cd/E16655_01/server
SQLRF54458
October 1, 20135

IDENTITY column
MySQL,MS SQL Server auto increment/identity
create table test_table(
id number generated by default on null as
identity,
name varchar2(10)
)
insert into test_table(name) values(‘ramin’)
insert into test_table(id,name) values(null,
‘ramin’)
http://docs.oracle.com/cd/E16655_01/gateways.121/
DRDAA109
October 1, 20136

VARCHAR2,NVARCHAR2 32K limit
32767 character support
VARCHAR2, NVARCHAR2, RAW
Initialization param
MAX_STRING_SIZE = EXTENDED
October 1, 20137

LIMIT, OFFSET support
select *
from (
select rownum rn, id, e.*
from employees e
)
where rn between 1 AND 10
order by 1;
October 1, 20138

October 1, 20139

October 1, 201310
SELECT employee_id, last_name
FROM employees
ORDER BY salary
FETCH FIRST 10 ROWS ONLY;
SELECT employee_id, last_name
FROM employees
ORDER BY salary
OFFSET 5 ROWS FETCH NEXT 10 ROWS
ONLY;

October 1, 201311
SELECT employee_id, last_name, salary
FROM employees
ORDER BY salary
FETCH FIRST 5 PERCENT ROWS WITH TIES;
http://docs.oracle.com/cd/E16655_01/server.121

Invisible column
October 1, 201312
create table app_user(
id number generated by default on
null as identity,
username varchar2(100) not null,
passwd varchar(100) invisible
);
select * from app_user;

Inline PL/SQL function WITH
October 1, 201313
with
function sqr(p_num in number)
return number
is
begin
return p_num * p_num;
end;
select u.user_id, sqr(u.user_id) from all_users
where rownum <= 10;
2.5-3x performance improvement
http://docs.oracle.com/cd/E16655_01/server.121/e17

PL/SQL new features
October 1, 201314
 New way for returning cursor
 Modularity with ACCESSIBLE BY
 New UTL_CALL_STACK package
 Using PL/SQL types in SQL context
 Result cache support for functions with
invoker’s right

New way for returning cursor
October 1, 201315
create procedure get_customer_order_list
as
cur_customer sys_refcursor;
cur_order sys_refcursor;
begin
open cur_customer for
select * from customer;
open cur_order for
select * from order;
dbms_sql.return_result(cur_customer);
dbms_sql.return_result(cur_order);
end;

New way for returning cursor
October 1, 201316
// sample JDBC code
String sql = “begin get_customer_order_list; end;”;
Connection con = datasource.getConnection();
PreparedStatement ps = con.prepareStatement();
ps.executeQuery(sql);
while(ps.getMoreResults()) {
ResultSet rs = ps.getResultSet();
while(rs.next()) {
… read columns
}
}

Modularity with ACCESSIBLE BY
October 1, 201317
package pkg_api;
package pkg_api_utility;
pkg_api_utility is considered to be used only by
pkg_api
ACCESSİBLE BY

October 1, 201318
CREATE OR REPLACE PACKAGE pkg_api_utility
ACCESSIBLE BY (pkg_api)
IS
PROCEDURE h1;
PROCEDURE h2;
END pkg_api_utility;
CREATE OR REPLACE PACKAGE BODY pkg_api_utility
IS
PROCEDURE h1 IS
BEGIN
DBMS_OUTPUT.PUT_LINE('Helper procedure h1');
END;
PROCEDURE h2 IS
BEGIN
DBMS_OUTPUT.PUT_LINE('Helper procedure h2');
END;
END pkg_api_utility;

October 1, 201319
begin
pkg_api.p1;
pkg_api.p2;
end;
begin
pkg_api_utility.h1;
pkg_api_utility.h2;
end;
ORA-06550
PLS-00904: insufficient privilege to access object
PKG_API_UTILITY

UTL_CALLSTACK package
October 1, 201320
DBMS_UTILITY functions related to call/error stack:
–FORMAT_CALL_STACK
–FORMAT_ERROR_STACK
–FORMAT_ERROR_BACKTRACE
New package: UTL_CALLSTACK
http://docs.oracle.com/cd/E16655_01/appdev.121/e17602/

Result cache support for functions
with invoker’s right
October 1, 201321
In Oracle Database 11g Release 2 (11.2),
only definer's rights PL/SQL functions could
be result cached.
Now, invoker's rights PL/SQL functions can
also be result cached. (The identity of the
invoking user is implicitly added to the key of
the result.)
http://docs.oracle.com/cd/E16655_01/appde
v.121/e17622/release_changes.htm#LNPLS1
10

Java new features
October 1, 201322
 PL/SQL boolean support in JDBC driver
 PL/SQL package level collection
support

Package level collection support
October 1, 201323
create or replace package TEST_PKG is
type V_TYP is varray(10) of
varchar2(200);
type R_TYP is record(c1 pls_integer, c2
varchar2(100));
procedure VARR_PROC(p1 in V_TYP, p2
OUT V_TYP);
procedure REC_PROC(p1 in R_TYP, p2
OUT R_TYP);
end;
/

Package level collection support
October 1, 201324
create or replace package body TEST_PKG is
procedure VARR_PROC(p1 in V_TYP,
p2 OUT V_TYP) is
begin
p2 := p1;
end;
procedure REC_PROC(p1 in R_TYP,
p2 OUT R_TYP) is
begin
p2 := p1;
end;
end;

JDBC code
October 1, 201325
CallableStatement cstmt = null;
try {
cstmt = conn.prepareCall("{ call
TEST_PKG.VARR_PROC(?,?) }");
Array arr =
((OracleConnection)conn).createArray("TEST_PKG.V_
TYP", new String[]{"A", "B"});
cstmt.setArray(1, arr);
cstmt.registerOutParameter(2, Types.ARRAY,
"TEST_PKG.V_TYP");
cstmt.execute();
//get PLSQL VARRAY type out parameter value
Array outArr = cstmt.getArray(2);
} catch( Exception e) {
e.printStackTrace();
}

JDBC code
October 1, 201326
try {
cstmt = conn.prepareCall("{ call
TEST_PKG.REC_PROC(?,?) }");
//PLSQL RECORD type binding
Struct struct =
conn.createStruct("TEST_PKG.R_TYP", new Object[]
{12345, "B"});
cstmt.setObject(1, struct);
cstmt.registerOutParameter(2, Types.STRUCT,
"TEST_PKG.R_TYP");
cstmt.execute();
//get PLSQL RECORD type out parameter value
Struct outStruct = (Struct)cstmt.getObject(2);
} catch( Exception e) {
e.printStackTrace();
}

JDBC code
October 1, 201327
CREATE OR REPLACE PACKAGE PACK1 AS
TYPE EMPLOYEE_ROWTYPE_ARRAY IS TABLE OF
EMPLOYEES%ROWTYPE;
END PACK1;
CallableStatement cstmt = conn.prepareCall("BEGIN
SELECT * BULK COLLECT INTO :1 FROM EMPLOYEE;
END;");
cstmt.registerOutParameter(1,OracleTypes.ARRAY,
"PACK1.EMPLOYEE_ROWTYPE_ARRAY");
cstmt.execute();
Array a = cstmt.getArray(1);

References
October 1, 201328
 http://docs.oracle.com/cd/E16655_01/appdev.121
/e17622/release_changes.htm
 http://www.toadworld.com/platforms/oracle/b/we
blog/archive/2013/07/01/oracle-database-12c-
new-pl-sql-features.aspx
 http://docs.oracle.com/cd/E16655_01/java.121/e1
7657/apxref.htm#CHEIIJCC
 http://www.oracle-base.com/articles/12c/with-
clause-enhancements-12cr1.php

IEEE Day 2013 Oracle Database 12c: new features for developers

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