Java bean & SQL Query

Hi;
I'm facing problem in running my application on different relational databses b'cos i wrote all my queries for Oracle 8i on Win-NT environment.& now i've to deploy the application on the Linux with MS-SQL database.
How to write sql query in java beans so that it run on all the relational databases without making changes to the query in every bean. OR
How to get the compatible query for different databases?
Thanks in advance.

Hey Kalpesh
If you have just the Connection process encapsulated in the Bean, then you can use it as a Singleton object.
Just take a look at the following snippet
public static getConnection(String db) {
if (db.equalsIgnoreCase("ORACLE")) {
if (con != null) {
return con;
} else {
con = DriverManager.getConnection("jdbc:oracle:thin:@"+IP+", " + user + ", " + password);
} else if (db.equalsIgnoreCase("SQLSERVER")) {
if (con != null) {
return con;
} else {
con = DriverManager.getConnection(sqlServerDBConnectionString);
This way you can reduce the number of live connections.
In the JSP, you can access this bean as:
<jsp:useBean id="mb" class="MyBean" scope=whatever/>
Connection con = mb.getConnection("ORACLE");
or
Connection con = mb.getConnection("SQLSERVER");
This way, you can meet your objective.
Check it out.

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I am using Tomcat 3.1 and MySQL database for an application I am designing. Below is the code for a java bean that registers users details. The code compiles correctly, but I would like to know if there is any code that I might have left out? What changes should I make to make it more user friendly?
I do not want to use servlets, as they are very difficult to setup.
REGISTRATION.JAVA
package gcd;
import java.sql.*;
import java.util.*;
import java.lang.*;
import java.awt.*;
import java.text.*;
import java.io.*;
import com.mysql.jdbc.*;
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String error;
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public void setLastName( String value )
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return first_name;
public String getLastName()
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public String getEmail()
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try
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try
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in JavaBean class:
The setting/getting method should be matched with the first letter capitalized. ie.
String firstName;
String lastName;
public void setFirstName(String value) { firstName = value ; }
public String getFirstName() { return firstName; }
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remember: put your bean in package and call from package.

How Can I Execute Sql Query in Managed bean?

Hi,
I want to execute sql query in managedbean and get the query result. How can I do?
Best wishes!

You can do this by having current Database connection your application is using like this
public static synchronized DBTransaction getDBTransaction(){
FacesContext ctx = FacesContext.getCurrentInstance();
ValueBinding vb = ctx.getApplication().createValueBinding("#{data}");
BindingContext bc = (BindingContext)vb.getValue(ctx.getCurrentInstance());
DataControl dc = bc.findDataControl("AppModuleDataControl");
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How to use sql query in java ?

i don't know how to use sql query in java code.
who can give me some advice?
thanks

http://java.sun.com/developer/onlineTraining/Database/JDBC20Intro/

Use an SQL Query in a backing bean

hi,
I like to know how to run an SQL query in a backing bean method, this being the code I tried , his goal is to fill the field "cin" with data coming from my database, here is the Code:
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BindingContainer bindings = getBindings();
OperationBinding operationBinding = bindings.getOperationBinding("CreateInsert");
Object result = operationBinding.execute();
if (!operationBinding.getErrors().isEmpty()) {
return null;
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ex.printStackTrace();
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please check and correct me
thanks in advance

Hi,
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We could create a readOnly VO (lets name it MaxDepartmentId) with a query that returns the max departmentId:
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If you run this you will see that when you create a new employee it has a default value.
Gabriel.

How to implement sql query in cmp bean?

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thanks
winnicki

If yout need post-query for filling descriptive colums (eg. department name in emploees) you should build a view object which includes the descriptive colums by joining the relevent tables

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hi
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(without view object we cant use setwhereclause() method thatsy i have to use sql statement in managed bean ........)
thanks in advance

First of all, you don't want to have any SQL in a managed bean. Managed beans are part of the View layer, and the query should be part of the Model. So what you want to do is add some code to your Model project. So you are trying to do "SELECT * FROM tab". Why not just create a read-only View Object (VO) for the query in the Model (assuming that you are using ADF BC).
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Hi All,
I m having requirement where I need to execute SQL Select Query in custom java class.
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Hi Pallavi,
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Regards,
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you can create a project in JDeveloper add the java file to it, add the Oracle JDBC library to the project properties and then hit the run button.

Datasource works with java code but not with sql:query dataSource=...

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I added a response in your original message:
http://forum.java.sun.com/thread.jspa?messageID=9629812
Let's keep to it since splitting things across two posts might be confusing.

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null

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Java.beans.Statement & java.sql.Statement

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Pete

There r two ways to do this.
(i) One is Implement the java.sql.Statement
like
package java.beans;
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try
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ABDUL

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Java bean & SQL Query

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