JSTL - SQL-Tags

SQL-Tags

 

 
coding-zon-JSTL-SQL-Tags

JSPHome


 
 
 
query.html

<html>  
<body>  

<form  method=post  action="query.jsp">  
<textarea    name='area1'    rows=10  cols=30>  
</textarea>  
<input  type=submit>  
</form> 
 
</body>  
</html>

query.jsp is given below. In the standard JDBC code, we begin by asking for the availability of the driver. "jdbc.odbc.JdbcOdbcDriver". And then, we specify the URL of the database as 'jdbc:odbc:telephone'. 


Similarly, in JSTL also, we begin with SQL.

<sql:setDataSource tag.
var 
driver
url 


<c:set var="s"  value="${param.area1}"  />

<c:out value="${s}" />


'<sql:query'  tag, takes  three attributes., such as, symbolic name:   

 var="query1" datasource="${db} sql="${s}


 query.jsp

 

<%@ taglib    prefix="c" %>uri="http://java.sun.com/jstl/core"  
<%@ taglib    prefix="sql" %> uri="http://java.sun.com/jstl/sql"  

<html>  
<body>  

<sql:setDataSource var="db" 
      driver="sun.jdbc.odbc.JdbcOdbcDriver" 
      url="jdbc:odbc:dbdemo"  />  
<c:set var='s' value="${param.area1}" />  
<c:out value="${s}" />  <br>  

<sql:query   var="query1" dataSource="${db}" sql="${s}" />   
</sql:query>  
<table border="1">  
  <c:forEach var="row" items="${query1.rows}" >  
 <tr> 
    <td> <c:out value="${row.name}" /></td> 
    <td> <c:out value="${row.place}" /></td>  
 </tr>  
 </c:forEach>  
</table>  
</body>  
</html>

dbeditor.jsp
 

<%@ taglib prefix="c" uri="http://java.sun.com/jstl/core"  %>  
<%@ taglib prefix="c" uri="http://java.sun.com/jstl/sql"  %>  

<html>  
<body>  
<sql:setDataSource var="db" 
      driver="sun.jdbc.odbc.JdbcOdbcDriver" 
      url="jdbc:odbc:dbdemo"  />

<c:set     var='a'   value='${param.text1}' />  
<c:set     var='b'   value='${param.text2}' />  
<c:set     var='c'   value='${param.text3}' />  
<c:set     var='d'   value='${param.combo1}'/> 
 


<c:if  test="${d == 'add'}" >

<sql:update var="query1"  dataSource="${db}"  
 sql="insert into table1 values${a}','${b}')" > 
</sql:update>  
<c:out value="record added"/>  
</c:if>  



<c:if test="${d == 'delete'}" >  
 <sql:update  var="query1"  dataSource="${db}" 
  sql="delete from table1 where name='${a}'" >   
</sql:update> 
 <c:out value="record deleted"/>  
</c:if>
 


<c:if  test="${d == 'modify'}" >

<sql:update var="query1"  dataSource="${db}"  
   sql="update table1 set table1.name='${a}', 
   table1.place='${b}' where 
   table1.name='${c}'" >   

<--sql  should be typed in a single line  -->
</sql:update>

<c:out value="record modified"/>
</c:if>

<c:if  test="${d == 'verify'}" >  
 <sql:query   var="query1"  dataSource="${db}"  
 sql="select * from table1 where name='${a}'" >   
 </sql:query>  
<table border="1">  
 <c:forEach   var="row" tems="${query1.rows}" >  
 <c:set       var="n" value="OK" />  
 <tr> 
    <td> <c:out value="${row.name}" /></td> 
    <td> <c:out value="${row.place}" /></td>  
 </tr>

 </c:forEach>  
 <c:if  test="${n != 'OK'}" >  
 <c:out value="No such Records" />  
 </c:if>

</table>
</c:if>
</html>
<body>

 

Comments

Post a Comment

Popular posts from this blog

Using javascript pass form variables to iframe src

Image
   Open PDF in Bootstrap Modal Window   This tutorial shows How to pass a JavaScript/jQuery variable to bootstrap modal view and sets it to iframe  src attribute. It passes value dynamically to src attribute of the iframe. When the user clicks a link, it opens the URL in a popup window. This  code shows the PDF in a Model without download option by hiding the toolbar.  To show PDF toolbar in modal, just add #toolbar=1   in the above script. index.php <!DOCTYPE html> <html lang= "en" > <head> <title>Bootstrap Model with PDF Example - coding-zon</title> <meta charset= "utf-8" > <meta name= "viewport" content= "width=device-width, initial-scale=1" > <link rel= "stylesheet" href= "https://cdn.jsdelivr.net/npm/bootstrap@4.6.2/dist/css/bootstrap.min.css" > <script src= "https://cdn.jsdelivr.net/npm/jquery@3.6.1/dist/jquery.slim.
Read more

Creating a new PDF by Merging PDF documents using TCPDF

Image
Merging two PDFs in PHP What is PDF? The Portable Document Format. PDF stands for "Portable Document Format". Essentially, the format is used when you need to save files that cannot be modified but still need to be easily shared and printed. PDF is one of the most commonly used file types around. PDFs generally contain shareable data, such as text or photo documents etc., and are accessible to anyone who has a computer or smartphone. Unlike a Word file, which requires Microsoft Word to view or edit, most browsers will open a PDF. How to merge PDFs? You can merge several documents into one. In PHP, you have a library called TCPDF which allows you to combine one or more PDF documents to one single document. In this article, we will create a new PDF by Merging PDF documents using TCPDF. Download the PDFMerger-tcpdf.zip here. Unzip it and copy it to the PHP server. Copy the PDF files into the same folder that you want to combine. Open the file: merge-pdf-example.php Provide
Read more

Import excel file into mysql in PHP

Image
  Upload Excel file and Import  it into MySQL in PHP  Create a table in some database with given code.   Download Library - extract it, rename the folder to library . Create index.php file with given code in a server. Create excelUpload.php with given code. Create db_config.php . Create one Excel file with some sample data as shown in the below image of Excel file. Create ' uploads ' folder in the same directory. Now start server, run the index.php. Upload a .xls file. If Everything is fine, Excel data inserted in the above created MySQL table - tbl_products . PHP Version:   5.5.11 Folder Structure      Query: CREATE TABLE IF NOT EXISTS `tbl_products` ( `id` int ( 11 ) NOT NULL AUTO_INCREMENT, `productname` varchar ( 100 ) DEFAULT NULL , `description` varchar ( 100 ) DEFAULT NULL , PRIMARY KEY (`id`) )     Top index.php <!DOCTYPE html> <html> <head> <title> coding-zon Demo - Upload Excel to MySQL in PHP </title> <lin
Read more