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Deep Gupta

IT tutor

Kalyani Nagar, Pune, India- 411006.

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Overview

I am MCA graduate and I have 1 year of experience in teaching. I provide Core Java, Advanced Java, Apache Tomcat, and web logic classes

Demo Class

No

Languages Spoken

English, Hindi

Address

Kalyani Nagar, Pune, India- 411006.

Apache Tomcat Training classes Overview

Apache Tomcat Training classes

Class Location

Student's Home

Tutor's Home

Online (video chat via skype, google hangout etc)

Years of Experience in Apache Tomcat Training classes

1

View all Classes

Reviews

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Answers by Deep Gupta (2)

"I need to know about JDBC. Can you help me please?" in   IT Courses/Java

Java JDBC is a java API to connect and execute query with the database. JDBC API uses jdbc drivers to connect with the database. JDBC Driver is a software component that enables java application to interact with the database.There are 4 types of JDBC drivers: JDBC-ODBC bridge driver Native-API driver (partially java driver) Network Protocol driver (fully java driver) Thin driver (fully java driver) There are 5 steps to connect any java application with the database in java using JDBC. They are as follows: Register the driver class Creating connection Creating statement Executing queries Closing connection The forName() method of Class class is used to register the driver class. This method is used to dynamically load the driver class. public static void forName(String className)throws ClassNotFoundException Class.forName("oracle.jdbc.driver.OracleDriver"); The getConnection() method of DriverManager class is used to establish connection with the database. 1) public static Connection getConnection(String url)throws SQLException 2) public static Connection getConnection(String url,String name,String password) throws SQLException Example to establish connection with the Oracle database Connection con=DriverManager.getConnection( "jdbc:oracle:thin:@localhost:1521:xe","system","password"); The createStatement() method of Connection interface is used to create statement. The object of statement is responsible to execute queries with the database. Syntax of createStatement() method public Statement createStatement()throws SQLException Statement stmt=con.createStatement(); Example to execute query ResultSet rs=stmt.executeQuery("select * from emp"); while(rs.next()){ System.out.println(rs.getInt(1)+" "+rs.getString(2)); } 5) Close the connection object By closing connection object statement and ResultSet will be closed automatically. The close() method of Connection interface is used to close the connection. Syntax of close() method public void close()throws SQLException Example to close connection con.close(); Hope this would help you.

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"what is serialVersionUID , why it different for each bean? serialVersionUID = 42L;" in   IT Courses/Java

ANY-ACCESS-MODIFIER static final long serialVersionUID = 42L; serialVersionUID is a static final field. You can assign any number of your choice to it. serialVersionUID is a must in serialization process. But it is optional for the developer to add it in java source file. If you are not going to add it in java source file, serialization runtime will generate a serialVersionUID and associate it with the class. The serialized object will contain this serialVersionUID along with other data. Even though serialVersionUID is a static field, it gets serialized along with the object. This is one exception to the general serialization rule that, “static fields are not serialized”. serialVersionUID is a 64-bit hash of the class name, interface class names, methods and fields. Serialization runtime generates a serialVersionUID if you do not add one in source. Refer this link for the algorithm to generate serialVersionUID. It is advised to have serialVersionUID as unique as possible. Thats why the java runtime chose to have such a complex algorithm to generate it.

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Deep Gupta address

x
Apache Tomcat Training classes

Class Location

Student's Home

Tutor's Home

Online (video chat via skype, google hangout etc)

Years of Experience in Apache Tomcat Training classes

1

Weblogic Training

Class Location

Student's Home

Tutor's Home

Online (video chat via skype, google hangout etc)

Years of Experience in Weblogic Training

1

Java Training Classes

Teaches

Spring, Core Java

Class Location

Student's Home

Tutor's Home

Online (video chat via skype, google hangout etc)

Years of Experience in Java Training Classes

1

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No Reviews yet! Be the first one to Review

"I need to know about JDBC. Can you help me please?" in   IT Courses/Java

Java JDBC is a java API to connect and execute query with the database. JDBC API uses jdbc drivers to connect with the database. JDBC Driver is a software component that enables java application to interact with the database.There are 4 types of JDBC drivers: JDBC-ODBC bridge driver Native-API driver (partially java driver) Network Protocol driver (fully java driver) Thin driver (fully java driver) There are 5 steps to connect any java application with the database in java using JDBC. They are as follows: Register the driver class Creating connection Creating statement Executing queries Closing connection The forName() method of Class class is used to register the driver class. This method is used to dynamically load the driver class. public static void forName(String className)throws ClassNotFoundException Class.forName("oracle.jdbc.driver.OracleDriver"); The getConnection() method of DriverManager class is used to establish connection with the database. 1) public static Connection getConnection(String url)throws SQLException 2) public static Connection getConnection(String url,String name,String password) throws SQLException Example to establish connection with the Oracle database Connection con=DriverManager.getConnection( "jdbc:oracle:thin:@localhost:1521:xe","system","password"); The createStatement() method of Connection interface is used to create statement. The object of statement is responsible to execute queries with the database. Syntax of createStatement() method public Statement createStatement()throws SQLException Statement stmt=con.createStatement(); Example to execute query ResultSet rs=stmt.executeQuery("select * from emp"); while(rs.next()){ System.out.println(rs.getInt(1)+" "+rs.getString(2)); } 5) Close the connection object By closing connection object statement and ResultSet will be closed automatically. The close() method of Connection interface is used to close the connection. Syntax of close() method public void close()throws SQLException Example to close connection con.close(); Hope this would help you.

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"what is serialVersionUID , why it different for each bean? serialVersionUID = 42L;" in   IT Courses/Java

ANY-ACCESS-MODIFIER static final long serialVersionUID = 42L; serialVersionUID is a static final field. You can assign any number of your choice to it. serialVersionUID is a must in serialization process. But it is optional for the developer to add it in java source file. If you are not going to add it in java source file, serialization runtime will generate a serialVersionUID and associate it with the class. The serialized object will contain this serialVersionUID along with other data. Even though serialVersionUID is a static field, it gets serialized along with the object. This is one exception to the general serialization rule that, “static fields are not serialized”. serialVersionUID is a 64-bit hash of the class name, interface class names, methods and fields. Serialization runtime generates a serialVersionUID if you do not add one in source. Refer this link for the algorithm to generate serialVersionUID. It is advised to have serialVersionUID as unique as possible. Thats why the java runtime chose to have such a complex algorithm to generate it.

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Deep Gupta describes himself as IT tutor. He conducts classes in Apache Tomcat Training, Java Training and Weblogic. Deep is located in Kalyani Nagar, Pune. Deep takes at students Home, Regular Classes- at his Home and Online Classes- via online medium. He has 1 years of teaching experience . He is well versed in English and Hindi.

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