JSTL SQL SetDataSource<sql:setDataSource> Example

JSTL setDataSource Tag provides capability to create a datasource directly from JSP and it can be stored in a variable to use later with the help of scope attribute.

Syntax-
<sql:setDataSource

  var="<string>"

  scope="<string>"

  dataSource="<string>"

  driver="<string>"

  url="<string>"

  user="<string>"

  password="<string>"/>


JSP <sql:setDataSource> Tag has following attributes.

1. driver Attribute: Specifies the driver to connect database. For each database there is a separate driver. In this example, we are connecting to MySQL database and hence driver is com.mysql.jdbc.Driver

2. url Attribute: Specifies the location of the database.

3. var Attribute: Specifies the variable which holds the dataSource once it is created.

4. user Attribute: Specifies the user you already created to access database.

5. password Attribute: Specifies the password for the user you already assigned to access database.

JSP setDataSource Example:

Consider the following information about your MySQL database setup:
  • We are using JDBC MySQL driver.
  • We are going to connect to TEST database on local machine.
  • We would use user_id and mypassword to access TEST database.

All the above parameters would vary based on your MySQL or any other database setup. Keeping above parameters in mind, following is a simple example to use setDataSource tag:
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<%@ taglib prefix="sql" uri="http://java.sun.com/jsp/jstl/sql"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" 
    "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>JSTL SQL Tags - setDataSource Example</title>
</head>
<body>

 <sql:setDataSource driver="com.mysql.jdbc.Driver"
            url="jdbc:mysql://localhost:3306/database_name"
            var="localSource" 
            user="database_user"  
            password="database_password"/>

 <sql:query dataSource="${localSource}" 
            sql="SELECT * FROM employee WHERE salary > 10000" 
            var="result" />
 
</body>
</html>

As shown above setDataSource Tag set data source in a variable localSource. Using this data source, you can do SQL operations directly from JSP.




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