Making a database in Java

would making a database in Java be hard especially if I wanted to incorporate SQL into the data base?

jverd wrote:
Adrienk wrote:
can I make a program that will interact with a database (lets say oracle)Google for jdbc tutorial.
in such a way where i can use arrays to store information and then sort through the arrays at a latter time by use of a search method to find and pull specific information? or would i even need a data base for this type of project?That's very vague, and arrays really have nothing to do with it. You will define classes in Java, such as, say, Student, Course, Instructor, Classroom, etc. A given application or feature will use some or all of those classes. If an application needs to be able to do things like "print the class list for a given student," and "find the classrooms available for a particular course," and a dozen others, then, yes, you probably want a database to manage the relationships, searching, filtering, and all the stuff that a DB is made for. If, on the other hand, it's just a simple app that displays a few things, lets you select something, and maybe retrieves a few simple objects by fixed keys like name or ID, then a DB is probably overkill.the relationship is what i want to do, so now i wonder - how do you create an application in java to interact with a database?

Similar Messages

How to Cache Data from database for java mapping ?

Hi
I have a scenario where i have to dynamically query a huge table in some other database from java mapping code.
Therefore instead of making a new Database trip everytime is there a mechanism by which i can cache the entire table contents into XI first and then use this cache for looking up data through my java mapping.
Any other alternative also welcome which would give best performance.
Please Suggest
regards
Nilesh Taunk.

Hi Nilesh,
I am not sure if you can actually cache the table in XI. You will have to look up directly from your Database everytime your mapping excecutes.
To perform DB lookup during mapping very efficiently, I would suggest that you take a look at this blog,
/people/siva.maranani/blog/2005/08/23/lookup146s-in-xi-made-simpler
Also, instead of doing the DB look up in mapping, you can also use your JDBC adapter as a sender and collect the information you want from your DB,
If you are using your JDBC as a sender, then your JDBC will poll over your database and select the rows that satisfy your Select Query. Also, there is another field in your JDBC adapter that is very important and that is the Update satatement. Once your JDBC adapter executes your select query and selects rows from the database, you might not need those rows to be selected again. In this csse, you can use the Update statement to update the database.
http://help.sap.com/saphelp_nw04/helpdata/en/7e/5df96381ec72468a00815dd80f8b63/content.htm
http://help.sap.com/saphelp_nw04/helpdata/en/2e/96fd3f2d14e869e10000000a155106/content.htm
The choice between a JDBC sender adapter , and the DB lookup will have to be on the basis of your requirements.
Regards,
Bhavesh

How to store file content in BLOB field MySql database using java

Hi!
i want to store the file content in a BLOB field in MySql database using java.
Please help me out..........
thanx in advance...
bye

i stored images in db, and retrieved them. like that cant i store pdf file in db, and retrieve it back using oracle db?
Plz help me out how to put a file in db. i need complete code. thanks in advance.

How To Store pdf or doc file in Oracle Database using Java Jdbc?

can any one help me out How To Store pdf or doc file in Oracle Database using Java Jdbc in JSP/Serlet? i tried like anything. using blob also i tried. but i am able 2 store images in DB not files. please if u know or else if u have some code like this plz send that to me, and help me out plz. i need that urgent.

Hi.. i am not getting error, But i am not getting the original contents from my file. i am getting all ASCII vales, instead of my original data. here i am including my code.
for Adding PDF in DB i used image.jsp
Database table structure (table name. pictures )
Name Null? Type
ID NOT NULL NUMBER(11)
IMAGE BLOB
<%@ page language="java" import="java.util.*,java.sql.*,java.io.*" pageEncoding="ISO-8859-1"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<%
try{
     Class.forName("oracle.jdbc.driver.OracleDriver");
     Connection con=DriverManager.getConnection("jdbc:oracle:thin:@192.168.1.135:1521:orcl","scott","tiger");
     PreparedStatement ps,pstmt,psmnt;
     ps = con.prepareStatement("INSERT INTO pictures VALUES(?,?)");
File file =
new File("D:/info.pdf");
FileInputStream fs = new FileInputStream(file);
ps.setInt(1,4);
ps.setBinaryStream(2,fs,fs.available());
int i = ps.executeUpdate();
if(i!=0){
out.println("<h2>PDF inserted successfully");
else{
out.println("<h2>Problem in image insertion");
catch(Exception e){
out.println("<h2>Failed Due To "+e);
%>
O/P: PDF inserted successfully
i tried to display that pdf using servlet. i am giving the code below.
import java.io.IOException;
import java.sql.*;
import java.io.*;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class DispPDF extends HttpServlet {
     * The doGet method of the servlet. <br>
     * This method is called when a form has its tag value method equals to get.
     * @param request the request send by the client to the server
     * @param response the response send by the server to the client
     * @throws ServletException if an error occurred
     * @throws IOException if an error occurred
     public void service(HttpServletRequest request, HttpServletResponse response)
               throws ServletException, IOException {
          //response.setContentType("text/html"); i commented. coz we cant use response two times.
          //PrintWriter out = response.getWriter();
          try{
               InputStream sPdf;
               Class.forName("oracle.jdbc.driver.OracleDriver");
                    Connection con=DriverManager.getConnection("jdbc:oracle:thin:@192.168.1.135:1521:orcl","scott","tiger");
                    PreparedStatement ps,pstmt,psmnt;
               psmnt = con.prepareStatement("SELECT image FROM pictures WHERE id = ?");
                    psmnt.setString(1, "4"); // here integer number '4' is image id from the table.
               ResultSet rs = psmnt.executeQuery();
                    if(rs.next()) {
               byte[] bytearray = new byte[1048576];
                    //out.println(bytearray);
                    int size=0;
                    sPdf = rs.getBinaryStream(1);
                    response.reset();
                    response.setContentType("application/pdf");
                    while((size=sPdf.read(bytearray))!= -1 ){
                    //out.println(size);
                    response.getOutputStream().write(bytearray,0,size);
               catch(Exception e){
               System.out.println("Failed Due To "+e);
                    //out.println("<h2>Failed Due To "+e);
          //out.close();
OP
PDF-1.4 %âãÏÓ 2 0 obj <>stream x+är á26S°00SIá2PÐ5´1ôÝ BÒ¸4Ü2KüsSSS4C²ê Pkø$VãGÒU×713CkW )(Ü endstream endobj 4 0 obj <>>>/MediaBox[0 0 595 842]>> endobj 1 0 obj <> endobj 3 0 obj <> endobj 5 0 obj <> endobj 6 0 obj <> endobj xref 0 7 0000000000 65535 f 0000000325 00000 n 0000000015 00000 n 0000000413 00000 n 0000000168 00000 n 0000000464 00000 n 0000000509 00000 n trailer <<01b2fa8b70ac262bfa939cc786f8770c>]/Root 5 0 R/Size 7/Info 6 0 R>> startxref 641 %%EOF
plz help me out.

Error in connecting Oracle Database from JAVA application!!!

Hi,
I am trying to connect to the Oracle11g database server from the client machine using JAVA eclipse. I have installed the oracle client in the client machine. Once i try to execute the below code it was throwing below error:
public class Dbconnect {
public static void main (String[] args)throws Exception {
try {
Class.forName ("oracle.jdbc.driver.OracleDriver");
String connectString = "jdbc:oracle:thin:@<IP Address>:1521:orcl";
OracleDriver drivers = new OracleDriver();
System.out.println(drivers);
Connection connection = null;
connection = (OracleConnection)DriverManager.getConnection(connectString,"ADMIN", "admin");
System.out.println(connection);
System.out.println("Connected to the database");
Error:
java.sql.SQLException: The Network Adapter could not establish the connection
     at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:412)
     at oracle.jdbc.driver.PhysicalConnection.<init>(PhysicalConnection.java:531)
     at oracle.jdbc.driver.T4CConnection.<init>(T4CConnection.java:221)
     at oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtension.java:32)
     at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:503)
     at java.sql.DriverManager.getConnection(Unknown Source)
     at java.sql.DriverManager.getConnection(Unknown Source)
     at DBConnect.main(DBConnect.java:15)
Caused by: oracle.net.ns.NetException: The Network Adapter could not establish the connection
     at oracle.net.nt.ConnStrategy.execute(ConnStrategy.java:359)
     at oracle.net.resolver.AddrResolution.resolveAndExecute(AddrResolution.java:422)
     at oracle.net.ns.NSProtocol.establishConnection(NSProtocol.java:672)
     at oracle.net.ns.NSProtocol.connect(NSProtocol.java:237)
     at oracle.jdbc.driver.T4CConnection.connect(T4CConnection.java:1042)
     at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:301)
     ... 7 more
Caused by: java.net.ConnectException: Connection refused: connect
     at java.net.PlainSocketImpl.socketConnect(Native Method)
     at java.net.PlainSocketImpl.doConnect(Unknown Source)
     at java.net.PlainSocketImpl.connectToAddress(Unknown Source)
     at java.net.PlainSocketImpl.connect(Unknown Source)
     at java.net.SocksSocketImpl.connect(Unknown Source)
     at java.net.Socket.connect(Unknown Source)
     at oracle.net.nt.TcpNTAdapter.connect(TcpNTAdapter.java:141)
     at oracle.net.nt.ConnOption.connect(ConnOption.java:123)
     at oracle.net.nt.ConnStrategy.execute(ConnStrategy.java:337)
     ... 12 more
I am unable to connect using sqlplus as well ORA-12560: TNS:protocol adapter error
Please advise me on how to resolve this issue..
Thanks

Prabhu wrote:
We are not able to connect from SQLplus as we.. If i issue this command in Sqlplus from client machine 'sqlplus admin/admin@'(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST=<Ip Adddress>)(PORT=1521)))(CONNECT_DATA=(SID=orcl)))'' it was throwing the below error.
Error: ORA-12541: TNS:no listener
Do i need add get any config details in the client machine..
Could please tell me what is the general procedure to access the DB server from client machine..on DB Server issue following OS commands
lsnrctl start
lsnrctl status
lsnrctl service
COPT commands & results, then PASTE all back here

How to put records in database from java coding?

I want to insert records in the database from java code. Please help me out. Can i get a sample code for that.

Google for JDBC tutorial. (...or read about hibernate)
Kaj

How can i use Unix database in java?

How can i use Unix database in Java?
Message was edited by:
JPro

I have not a clue about FoxPro, but the db then is FoxPro and not Unix. The better question would be "How do I connect to FoxPro DB running on Unix with JDBC?".
My answer to that would be, search the Internet for a JDBC driver.

Request parameter are not stored in database through Java Bean

Hi,
I want to store the request parameter in database through Java Bean.Allthough program are properly run but value are not store in DB.
Here My code:
Login.html:<html>
<head>
<title>A simple JSP application</title>
<head>
<body>
<form method="get" action="submit.jsp" >
Name: <input type="text" name="User">
Password: <input type="password" name="Pass">
<input type="Submit" value="Submit">
</form>
</body>
</html>SimpleBean.java:
package co;
import java.util.*;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.sql.*;
import java.util.*;
public class SimpleBean implements java.io.Serializable{
private String User="";
private String Pass="";
public SimpleBean(){}
public String getUser() {
return User;
public void setUser(String User) {
this.User = User;
public String getPass() {
return Pass;
public void setPass(String Pass) {
this.Pass = Pass;
public void show()
try
System.out.println("Printed*************************************************************");
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
System.out.println("Loading....");
Connection con=DriverManager.getConnection("jdbc:odbc:Ex11dump");
System.out.println("Connected....");
PreparedStatement st=con.prepareStatement("insert into Table1 values(?,?)");
System.out.println("~~~~~~~~~~~~~~~~~~~~");
String User=getUser();
st.setString(1,User);
String Pass=getPass();
st.setString(2,Pass);
int y= st.executeUpdate();
System.out.println(y);
System.out.println("Query Executed");
con.commit();
con.close();
System.out.println("Your logging is saved in DB *****************");
catch(Exception e)
e.printStackTrace();
}submit.jsp:
<jsp:useBean id="obj" class="co.SimpleBean"/>
<jsp:setProperty name="obj" property="*" />
<jsp:getProperty name="obj" property="User" /> <br>
<jsp:getProperty name="obj" property="Pass" /> <br>
<% obj.show();%>
<%
out.println("Ur data is saved in DB");
%>Please Help me.
Thanks.

The issue is in the naming of your fields.
Change User -> user and Pass->pass
Name: <input type="text" name="user">
Password: <input type="password" name="pass">

Call EJB From Oracle Stored proc or Database loaded Java?

Are there any examples of calling an EJB, residing in the OC4J on a machine separate from the DB server,
from an Oracle PL/SQL stored proc.
The Stored proc can call java loaded into the DB. That java makes the intial bean context. Or another way if suggested.
The reason is that I need to use some drivers that I have so far been unable to load directly into the DB using
loadjava util. I plan on using the driver in the EJB, located on a different machine. But I'd like so know if its possible to
make the IntialContext call to the EJB container from PL/SQL. Are the OC4J drivers loadable to be
able to be called from a database loaded java class? ( I might be a little off on my terminology)
Bob
[email protected]

Hi Bob,
Your question has been previously asked on this forum many times already.
You can probably find the relevant postings by doing a search of the
forum archives.
To summarize those posts, as I understand it, the latest version of OC4J
(version 9.0.3) contains a "oc4jclient.jar" file (I think that's the name
of the file), that can be loaded into the Oracle database (using the
"loadjava" utility), and which allows a java stored procedure to invoke
methods on an EJB residing in OC4J.
Please note that I have not tried any of the above -- I am only summarizing
for you what has already been posted. And like I said before, a search
of the forum archives will probably give you more details.
Good Luck,
Avi.

How to read data from SAP database in java?

Hi All ,
I want to read some tables from SAP database in java? How to connect to SAP database in java.I want to read the data from SAP NetWeaver BW 7.3.
Please help..

Download Vder [http://binhgiang.sourceforge.net/site/download.jsp|http://binhgiang.sourceforge.net/site/download.jsp]
Extract date from website, output to xml format then save to database (MySQL, Oracle,...)
Screenshot: [http://binhgiang.sourceforge.net/xmlalbum/screenshots.html|http://binhgiang.sourceforge.net/xmlalbum/screenshots.html]
Edited by: Nhu_Dinh_Thuan on Jul 23, 2009 9:55 PM
Edited by: Nhu_Dinh_Thuan on Jul 23, 2009 9:56 PM

How to restore a mysql dump file to database using java

hai friends,
i'm developing an application. in that i need to back up and restore the database. i'm using mysql.
in that i used a code to back up the db.. its working perfectly and the dump file is created perfectly..
but while trying to restore the dump file nothing is happening...
can anyone provide me a sample code to restore the dump to database using java code...
thanks in advance...

The first, biggest mistake you made in the code is that you didn't read standard output and error from the process, and/or you're ignoring exceptions. Because if you did, you would have read error messages that would have given you a clue what's wrong. (either that, or you ignored the clues, or didn't understand them and failed to tell us what the error messages are)
The second mistake is that you invoked exec with the call that takes a single string, when that string includes whitespace not used as delimiters.
The third mistake was that you used a terrible subject line for your post. Your problem is that you're having trouble with Runtime.exec. The fact that it's about mysql isn't relevent.
The fourth mistake is that you didn't mention Runtime.exec at all until pushed. You should provide these details. When you try to self-diagnose something that you don't understand, and then hide information, you're just wasting everybody's time, including your won.
The fifth mistake is that you're using poor spelling.
The sixth mistake is that you still haven't said why you're doing this in Java.

How to store images in database using java

hii
how to store images in database using java..........
Message was edited by:
naveennaga

I asked a similar question once and the answer I got was - Don't.
Instead, store the images on a drive somewhere and store the path in the database.
But I'm no expert - that's just what I was told by someone who does this kind of stuff a lot.
Hope that helps.

Problem with making a database link.

Hello All
I got a problem with making a database link.
When I execute this query
CREATE PUBLIC DATABASE LINK DBNAME
CONNECT TO database IDENTIFIED BY name
USING 'DBNAME.europe.company.com';
I am using other names because its private information
But when I look at the table dba_db_links I see this
OWNER | DB_LINK | USERNAME |HOST
PUBLIC| DBNAME.europe.company.com| name| DBNAME.europe.company.com
So the DB_Link name is changed. And this causes a problem with my asp website. I get the fault message
ORA-02085: database link DBNAME.europe.company.com connects to DBNAME
Cause: a database link connected to a database with a different name. The connection is rejected.
The global_names = true and I prefer to keep it that way.
So does anyone knows what is wrong about my Query or how I can change the DB_Link name.
Thanks for the support,
Remco

Thanks for the help Mohit
But thats whats I was doing.
The query in the first post is the same as what you are posting.
But by an (for me) unknown reason the database converts DBNAME to DBNAME.europe.company.com

How to create a oracle database by java code?

how to create a oracle database by java code?
please give some ways then that way's code

I'm not sure what you mean with "database". Do you mean an Oracle instance or an Oracle user/schema (probably the latter, because that's the equivalent to a MS SQL Database).
Creating an instance is definitely not possible from within Java. To create a new user this should be possible, as this can be done with SQL:
GRANT connect,resource TO <newuser> IDENTIFIED BY <password>;
I'm always cautious with questions like this. In 90% of the cases there is something wrong with the initial design. Creating a database shouldn't be something the application is doing.
Thomas

Create new oracle database with JAVA

Hi!
I would appreciated it if you could help me to solve a problem that i have.
I am trying to create a new oracle database by a JAVA 1.4.2 application. I am using the scripts that Oracle 10.g supplies during the creation of a new database from the server (Generate Database Creation Scripts) with the appropriate changes, generated by a java application. Unfortunately, i am unable to connect with the database and the listener. Is there any other way to create a new database by java and how can i solve my current problem with the oracle scripts?
Thank you.

A) To create a new schema, you need to be connected as a user that has create schema privilege, or as tyhe user who is to own the schema (remembering that the user has appropriate create privs, as seen in the GRANT command in the SQL Reference manual). Not an issue at all, I think, if you coordinate this with your DBA. Discussed very well in the Administrator's manual.
B) Alternately, you could create a complete copy of the schema, including all desired objects (tables, views, etc.) in a separate database and simply export the user and schema. Then simply invoke the OS-based import command (imp) to load that entire thing into the target database.
C) To create a new database, there are 3 simple steps ...
1) create the appropriate initialization parameter file
the init{sid}.ora file should be placed in the $ORACLE_HOME/dbs or %ORACLE_HOME%\database directory. (I recommend you do not attempt to create the spfile.) Of critical interest will be setting the block size information, the control file parameters, and using the appropriate memory management parameters, based on the version of the software you will be using to create the database instance.
2) start an empty instance, pointing to the parameter file
This will be an OS specific call, and will require that you have the correct OS environment set up as well as access to the ORACLE_HOME which will provide the software that you will invoke. In *nix you will need to call the sqlplus command with sysdba provs and in Windows you will need to call oradim to initialize this as a service.
3) run the SQL create database command
You might want to use the dbca to create a template of the create database command, or look in the SQL Reference manual for the variations on the command. Of critical interest will be initializing the redo logs as well as the system, sysaux (if needed), temp and undo tablespaces after which you can set up the regular tablespaces, users and schemas. I highly recommend that you have redundant copies of the control files on separate drives.
You may want to review the online Concepts manual and the Adminstration Guide for some of the specifics to your needs, but I think I've covered the basics.
Remember that ideally you will only have one database instantiated on any given server as the memory and CPU overhead of each instance is significant.
Good luck.

Making a database in Java

Similar Messages

Maybe you are looking for