YouTip<sql:dateParam> Tag
The <sql:dateParam> tag is used in conjunction with the <sql:query> and <sql:update> tags to provide date and time placeholders. If the value is null, the placeholder is set to SQL NULL.
Syntax
<sql:dateParam value="<string>" type="<string>"/>Attributes
The <sql:dateParam> tag has the following attributes:
| Attribute | Description | Required | Default |
|---|---|---|---|
| value | The date parameter to set (java.util.Date) | No | Body |
| type | DATE (date only), TIME (time only), TIMESTAMP (date and time) | No | TIMESTAMP |
Example
First, we need to create an Employees table in the TEST database and add some records. The specific steps are as follows:
Step 1:
Open CMD and change the directory to the installation directory:
C:>
C:>cd Program FilesMySQLbin
C:Program FilesMySQLbin>Step 2:
Log in to the database:
C:Program FilesMySQLbin>mysql -u root -p
Enter password: ********
mysql>Step 3:
Create the Employees table in the TEST database:
mysql> use TEST;
mysql> create table Students
(
id int not null,
first varchar (255),
last varchar (255),
dob date
);
Query OK, 0 rows affected (0.08 sec)
mysql>Create Data Records:
Finally, create a few records in the Students table:
mysql> INSERT INTO Students
VALUES (100, 'Zara', 'Ali', '2002/05/16');
Query OK, 1 row affected (0.05 sec)
mysql> INSERT INTO Students
VALUES (101, 'Mahnaz', 'Fatma', '1978/11/28');
Query OK, 1 row affected (0.00 sec)
mysql> INSERT INTO Students
VALUES (102, 'Zaid', 'Khan', '1980/10/10');
Query OK, 1 row affected (0.00 sec)
mysql> INSERT INTO Students
VALUES (103, 'Sumit', 'Mittal', '1971/05/08');
Query OK, 1 row affected (0.00 sec)
mysql>Now, write a JSP file that uses the <sql:update>, <sql:param>, and <sql:dateParam> tags to execute an SQL UPDATE statement, updating Zara's date of birth:
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ page import="java.io.*,java.util.*,java.sql.*"%>
<%@ page import="javax.servlet.http.*,javax.servlet.*" %>
<%@ page import="java.util.Date,java.text.*" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/sql" prefix="sql"%>
<html>
<head>
<title>JSTL sql:dataParam Tag</title>
</head>
<body>
<sql:setDataSource var="snapshot" driver="com.mysql.jdbc.Driver"
url="jdbc:mysql://localhost/TEST"
user="root" password="pass123"/>
<%
Date DoB = new Date("2001/12/16");
int studentId = 100;
%>
<sql:update dataSource="${snapshot}" var="count">
UPDATE Students SET dob = ? WHERE Id = ?
<sql:dateParam value="<%=DoB%>" type="DATE" />
<sql:param value="<%=studentId%>" />
</sql:update>
<sql:query dataSource="${snapshot}" var="result">
SELECT * from Students;
</sql:query>
<table border="1" width="100%">
<tr>
<th>Emp ID</th>
<th>First Name</th>
<th>Last Name</th>
<th>DoB</th>
</tr>
<c:forEach var="row" items="${result.rows}">
<tr>
<td><c:out value="${row.id}"/></td>
<td><c:out value="${row.first}"/></td>
<td><c:out value="${row.last}"/></td>
<td><c:out value="${row.dob}"/></td>
</tr>
</c:forEach>
</table>
</body>
</html>The result is as follows: