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JDBC interview questions

  • Image upload from JSP to DataBase ? view answer
  • How to Upload Image into Data Base ? view answer
  • Q. What is Rowset ? CachedRowSet,JDBCRowSet and WebRowSet ? view answer
  • Q. What is Batch Updates Using Statements in JDBC ? view answer
  • Q.Handling Blob and CLOB data using JDBC ? Insert CLOB and Retrive CLOB , Convert into String ? view answer
  • Q. Calling Stored procedures with Callable Statement ? view answer
  • Q.What is JDBC ? Explain Types Of Drivers with Advantage and Disadvantage ? view answer
  • Q. How java retrive the result returns from stored procedure ? view answer
  • Q.How to retrive the results in java returned by refcursor in Stored procedure ? view answer
  • Q.Reading an Oracle ARRAY from a stored procedure as an out ? view answer
  • What is Metadata and why should I use it? view answer
  • How Class.forName() load the Driver and DriverManager.getConnection() return connection? view answer
  • What will Class.forName do while loading drivers? view answer
  • How to Determining If a Result Set Is Scrollable? view answer
  • How Getting the Number of Rows in a Table Using a Scrollable Result Set? view answer
  • What is Scrollable Result Set ? view answer
  • What does setAutoCommit do? view answer
  • What is the difference between TYPE_SCROLL_INSENSITIVE , and TYPE_SCROLL_SENSITIVE? view answer
  • How to Make Updates to Updatable Result Sets? view answer
  • How can you move the cursor in scrollable result sets? view answer
  • What are the different types of Statements with Example? view answer
  • How can you retrieve data from the ResultSet? view answer
  • How can you create JDBC statements and what are they? view answer
  • How can you make the connection? view answer
  • What will Class.forName do while loading drivers? view answer
  • How can you load the drivers? view answer
  • What is PreparedStatement ? view answer
  • what is rowset? and how does it differ from resultset ? view answer
  • How to find total column from a resultset? view answer
  • What is the fastest type of JDBC driver? view answer
  • What are the different JDB drivers available? view answer
  • Q.What are collection pools? What are the advantages? view answer
  • Q.What are different types of Transaction Isolation Levels? view answer
  • Q. What is Dirty read? view answer
  • Q.Difference between Statement , PreparedStatement and CallableStatement ? view answer
  • Q.What is the advantage of using PreparedStatement? view answer
  • Q.What is Single-Phase Commit ? view answer
  • Q.What is two-phase commit? view answer
  • Q. How JDBC work with REF CURSOR returned by stored procedure and retrive results? view answer
  • Q. How do i get result return from stored procedure in JDBC? view answer
  • Q.How do you call a Stored Procedure from JDBC? view answer
  • Q.How do you handle your own transaction ? view answer
  • Q.What are the steps in the JDBC connection? view answer

!!! JDBC interview questions !!!

Q. What is Rowset ? CachedRowSet,JDBCRowSet and WebRowSet ?



A RowSet object is a java bean component and extends the ResultSet interface.
The RowSet is majorly classified into two types :

1. Connected Rowset :
The connected rowset as the name suggests in connected to the database connection object like the resultset.
The JDBCRowSet is the example of the connected RowSet.

2. Disconnected RowSet:
The disconnected RowSet only connects to the database whenever required and after finishing the interaction they close the database connection.

There are three types of RowSet :

A CachedRowSet class?
a disconnected rowset that caches its data in memory; not suitable for very large data sets, but an ideal way to provide thin Java clients.

Example :
CachedRowSet cachedRs = new CachedRowSetImpl();
cachedRs.setUsername("scott");
cachedRs.setPassword("tiger");
cachedRs.setUrl("jdbc:oracle://localhost:3306/test");
cachedRs.setCommand("select * from employee");
cachedRs.setPageSize(4);
cachedRs.execute();
while (cachedRs.nextPage()) {
while (cachedRs.next()) {
System.out.println(cachedRs.getString("emp_name"));
}
}

A JDBCRowSet class?
a connected rowset that serves mainly as a thin wrapper around a ResultSet object to make a JDBC driver look like a JavaBeans component.
Example:
JdbcRowSet jdbcRs = new JdbcRowSetImpl();
jdbcRs.setUsername("scott");
jdbcRs.setPassword("tiger");
jdbcRs.setUrl("jdbc:oracle://localhost:3306/test");
jdbcRs.setCommand("select * from employee");
jdbcRs.execute();
while(jdbcRs.next()) {
System.out.println(jdbcRs.getString("emp_name"));
}


A WebRowSet class?
a connected rowset that uses the HTTP protocol internally to talk to a Java servlet that provides data access;
used to make it possible for thin web clients to retrieve and possibly update a set of rows.

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