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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 !!!

Image upload from JSP to DataBase ?

Image upload from JSP to Data Base step by step :

step 1 :
In the JSP
<form name="regform2" method="post" enctype="multipart/form-data">
<input type="file" name="ImageFile" id="ImageFile" onChange="uploadImage()"/>

java script :
function uploadImage(){
document.regform.action ="<%=request.getContextPath()%>/dfdmin?cmd=uploadimage";

Step 2.
In the servlet - add the below code.
String rtempfile = File.createTempFile("temp","1").getParent();
MultipartRequest multi = new MultipartRequest(request, rtempfile, 500000 * 1024);
File rnewfile=null;
rnewfile = new File(CommonArt.IMAGE_PATH+"jsp"+File.separator+"images"+File.separator+"uploadImage"+File.separator);

File f = multi.getFile("ImageFile");
FileInputStream fin =new FileInputStream(f);
RandomAccessFile r = new RandomAccessFile(rnewfile+File.separator+f.getName(),"rw");
filename = f.getName();
// FileOutputStream fos =new FileOutputStream(rnewfile);
byte sizefile[] = new byte[5000000];
// fos.write(sizefile);

Step 3.
Insert into Database

InputStream is = new FileInputStream(f);
String sql = " INSERT INTO image_upload (IMAGE) VALUES (?) ";
pStmt = conn.prepareStatement(sql);
pStmt.setBinaryStream(1, is, (int)(f.length()));

This will upload multipart file to your data base.

Note : get cos.jar from oreilly website

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