This document discusses JDBC (Java Database Connectivity) which provides an API for interfacing Java code with databases. It describes the four types of JDBC drivers, focusing on Type 1 (JDBC-ODBC bridge) and Type 4 (Pure Java) drivers. It provides code examples for connecting to a database using a Type 1 driver, performing CRUD operations like creating tables, inserting rows, updating and fetching rows. It also covers topics like transactions, prepared statements, and handling exceptions.
Introduction to JDBC and database access in web applicationsFulvio Corno
Introduction to the JDBC standard and best practices for database access from Web Applications.
Materiale realizzato per il corso di Sistemi Informativi Aziendali del Politecnico di Torino - http://bit.ly/sistinfo
Introduction to JDBC and database access in web applicationsFulvio Corno
Introduction to the JDBC standard and best practices for database access from Web Applications.
Materiale realizzato per il corso di Sistemi Informativi Aziendali del Politecnico di Torino - http://bit.ly/sistinfo
Core Java Programming Language (JSE) : Chapter XIII - JDBCWebStackAcademy
Java Database Connectivity (JDBC) is an application programming interface (API) for the programming language Java, which defines how a client may access a database. It is a Java-based data access technology used for Java database connectivity. It is part of the Java Standard Edition platform, from Oracle Corporation. It provides methods to query and update data in a database, and is oriented towards relational databases. A JDBC-to-ODBC bridge enables connections to any ODBC-accessible data source in the Java virtual machine (JVM) host environment.
Core Java Programming Language (JSE) : Chapter XIII - JDBCWebStackAcademy
Java Database Connectivity (JDBC) is an application programming interface (API) for the programming language Java, which defines how a client may access a database. It is a Java-based data access technology used for Java database connectivity. It is part of the Java Standard Edition platform, from Oracle Corporation. It provides methods to query and update data in a database, and is oriented towards relational databases. A JDBC-to-ODBC bridge enables connections to any ODBC-accessible data source in the Java virtual machine (JVM) host environment.
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top nidhi software solution freedownloadvrstrong314
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OpenFOAM solver for Helmholtz equation, helmholtzFoam / helmholtzBubbleFoamtakuyayamamoto1800
In this slide, we show the simulation example and the way to compile this solver.
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However, this is neither the first nor the last activity of IntekBroker. We have compiled for you what happened in the last few days. To track such hacker activities on dark web sources like hacker forums, private Telegram channels, and other hidden platforms where cyber threats often originate, you can check SOCRadar’s Dark Web News.
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Software Engineering, Software Consulting, Tech Lead.
Spring Boot, Spring Cloud, Spring Core, Spring JDBC, Spring Security,
Spring Transaction, Spring MVC,
Log4j, REST/SOAP WEB-SERVICES.
1. JDBC: What & Why?
As we all know, Java is platform independent,
there must be some means to have some ready-to-
hand way, specifically some API to handle
Database activities that can interface between
your Java Code and an RDBMS and perform the
desired SQL. This is known as Java DataBase
Connectivity (JDBC). JDBC-version 2.x defines 2
packages, java.sql and javax.sql that provide the
basement of a JDBC API
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2. JDBC Drivers & Types
• As JDBC plays the role to interface between the
RDBMS and Java Code, from the Database’s part,
there must be some vendor specific utilities that
will cooperate with JDBC. These are known as
JDBC Drivers, having 4 Types, Type-1 to Type-4.
We, however, must avoid theoretical discussion
about them but shall deal with Type-1, also known
as JDBC-ODBC Bridge, and Type-4, also known
as Pure Java Driver. So, on to the next slide…
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3. Primary Steps to code JDBC with
ODBC Bridge Driver
• STEP-1: Load the Driver Class, coded as
• Class.forName(“sun.jdbc.odbc.JdbcOdbcDriver”);
• This statement loads the said class in memory,
thus allowing your code to succeed.
• STEP-2: Obtain a Database Connection
represented by java.sql.Connection interface, to
be obtained through code as
• Connection
conn=DriverManager.getConnection(“jdbc:odbc:ibm”);
• Here “jdbc:odbc:ibm” is the connection
String, where ibm is set up through
Control Panel as follows…
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17. Some important features
• After establishing a Connection, we have to create
a Statement or PreparedStatement object that
would execute the desired SQL.
• There are 3 methods: execute(), executeUpdate()
and executeQuery(). The first 2 return int indicating
the number of rows updated/ otherwise, whereas
the last one returns a java.sql.ResultSet that holds
the data. At first it points to the BOC so we have to
call next() method that returns false when no data
is available else true. Also, next() causes the cursor
to advance one step. Some special ResultSets may
fetch data in either direction.
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18. Executing SQL through JDBC
• SQL, though may differ from an RDBMS to
another, always involves 4 basic operations
known as CRUD (Create, Read, Update,
Delete).
• Basically there are 2 categories of options; first,
Write operation involving create, insert, update,
delete etc… and second, READ operation. We
perform these through Statement and/or
PreparedStatement.
• The next slide depicts how basic SQL can be
executed through these objects.
Monday, October 13, 2014sohamsengupta@yahoo.com 18
19. A Simple Insert Command
• Assuming a table, StudentTable comprising 3 fields: id
varchar(30), name varchar(40) and marks INTEGER, we
may insert the data set (‘it/00/57’, ‘Soham’, 940) with the
command:
• Insert into StudentTable (id,name,marks) values(‘it/00/57’, ‘Soham’,
940);
• If we represent the above by a Java String object and the column values
being termed by variables strName, strId and intMarks, then, the SQL
becomes, in code,
• String strSQL=“insert into StudentTable (id,name,marks) values(‘”+
strId+”’,’”+strName+”’,”+intMarks+”)”;
• Here, + operator concatenates the SQL with column values replaced
by corresponding variables. We, however, must be aware to close an
open parenthesis and/or a single-quote( ‘ ). This is to be executed with
a java.sql.Statement object.
• But this is a nasty coding, and should be avoided with
PreparedStatement decsribed in the next slide
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20. How PreparedStatement Betters
Clumsiness in code
• After loading the driver class, and obtaining the
Connection object (say, conn), we should code
as :
• PreparedStatement ps=conn.prepareStatement(“insert into
StudentTable (id,name,marks) values(?,?,?)”);
• ps.setString(1,strId);
• ps.setString(2,strName);
• ps.setInt(3,intMarks);
• ps.executeUpdate();
• What we should keep in mind is, index the setters correctly, for
example, ps.setString(1,strId) as I’m inserting the column id at
1, name at 2 and marks at 3.
• Thus, PreparedStatement can be used for other SQL
commands, too, like select commands et al.
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21. Transaction Failure Management
(TFM)
• The Software market extensively uses RDBMS and
it’s quite obvious those built on Java Technology
would involve JDBC. Also, what goes without saying
is, these Software packages involve highly delicate
Transactions like Banking etc. and hence must
conform to the maximum level of TFM, else the
entire ACID paradigms would be violated causing
much a chaos. JDBC API provides with built-in TFM
at coding level. You must be aware that if any thing
goes wrong in a JDBC transaction, checked
Exception like java.sql.SQLException and others are
thrown. So, we put the entire ATOMIC Transaction
code under a try-catch Exception handling scanner.
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22. TFM Coding Style
Connection conn;
try{
Class.forName(“sun.jdbc.odbc.JdbcOdbcDriver”);
conn=DriverManager.getConnection(“jdbc:odbc:dsn”);
conn.setAutoCommit(false); // don’t coomit until entire done
…
…
conn.commit(); // now, no Exception, thank God, now commit it
}catch(Throwable t){
conn.rollback(); // This makes the system to roll back on
//Exception
}
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