3 jdbc api

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JDBC API

JDBC API
• this is a part of the JDBC Specification that provides an abstraction
(interface) to program java applications ...

Why should I use Database server?
• Because to manage the persistence data, why persist the data because to persist our bu...

The Basic steps of working with JDBC
API
• We know that the java application wants to work
with JDBC to access the tabular...

• Here our intention is to execute the statement
i.e. Step 3: but to perform step 3 we should
have step 2, to do the step ...

Step1: obtaining the connection to
DB:
• STEP1 : is just like a connecting to the mail
box, first we have to use login, pa...

• STEP1 : is just like a connecting to the mail box, first we
have to use login, password to connect to our Mail inbox
• W...

Q: How establish/obtain connection to
DB with respect to java/JDBC?

• We have multiple approaches to do this
• Lets start with the basic (primary) approach i.e
using driver object direction.

APPROACH 1:
• Obtaining the connection to db using Driver
object directly: in this approach we use the
connect() method of...

Q: What is Driver object?
Ans: it is a part of JDBC Driver responsible for establishing a session to the database server.
...

Step 1: create a Driver object instance
• We know that the Driver class (i.e: implementation of java.sql.Driver
interface)...

Q: How many ways we can instantiate a java object (with respect to JRE)?
Ans:
We have only 4 ways to do this:
new keyword
...

• Supports instantiating the object whose class name is known dynamically at run
time.
• (3.) clone():
• To create a new o...

• Note:
• Tightly bounded: In case any changes in a program and main logic may be destroyed is called tightly bounded.
• L...

• //Test.java with using newInstance() method of java.lang.Class
• public class Test
• {
• public static void main(String ...

• output:
• D:webtechnologiesjdbcprognewInstance>javac *.java
•
• D:webtechnologiesjdbcprognewInstance>java Test Oraclemsg...

• //Test.java with using new operator
• public class Test
• {
• public static void main(String args[])
• {
• Message msg;
...

• Q: How work with the Class.newInstance() method to create a object?
• Ans:
• We want to implement the following two stat...

Q: What is the role of the Class object
in the JVM?

Fig: newInstanceJVM.JPG

Fig: newInstanceJVM.JPG

Fig: newInstanceJVM.JPG

Fig: newInstanceJVM.JPG

Fig: newInstanceJVM.JPG

Fig: newInstanceJVM.JPG

Fig: newInstanceJVM.JPG

Fig: newInstanceJVM.JPG

Q: What is the role of the Class object
in the JVM?
• Fig: newInstanceJVM.JPG
• We know that for every type loaded into th...

Q: What happens when we invoke
the newInstance()?
• Ans:
• The newInstance() method of Class object creates
a new instance...

Note:
• In case of private constructor:
• //Abc.java
• public class Abc
• {
• private Abc()
• {
• System.out.println("priv...

• But in case we are creating the object inside the class (Ex: Abc.java then no problem directly we can create by
using ne...

List 1.1: Sample code for Step 1.1: creating a Driver class instance
•
String
driverClassName=”oracle.jdbc.driver.OracleDr...

Step 1.2: Invoking the connect() method:
•
• We know that the connect() method is non-static thus
we need a Driver object ...

jdbcUrl(String)
• as the name described this is a simple string used
by JDBC to locate the
• database server that we it to...

jdbcUrl(String)

• From the URL Format we understand locating the
database server includes the information (inputs) that
varies from one DB...

In case of Type 1 driver: jdbcurl2.JPG

In case of JDBC Type-2 Driver:
Jdbc:oracle:oci:@<TNS_SERVICE_NAME>
Fig: jdbcurl3.JPG

Note:
• If I want to connect to Oracle DB Server, I have to write
the information about Oracle Driver in Driver object
and...

In case of JDBC Type-4 Driver:

2. dbProperties: second (2nd) argument (parameter) of
connect() method
• Apart from providing the URL for locating the
dat...

Map
Key Value
User System
Password manager

• Thus the 2
nd
argument of connect() method is
Properties

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