How to pass a date variable in sql query in a JSP?

SQLJSPJava 8Object Oriented ProgrammingProgramming

The <sql:dateParam> tag is used as a nested action for the <sql:query> and the <sql:update> tag to supply a date and time value for a value placeholder. If a null value is provided, the value is set to SQL NULL for the placeholder.

Attribute

The <sql:dateParam> tag has the following attributes −

AttributeDescriptionRequiredDefault
ValueValue of the date parameter to set (java.util.Date)NoBody
typeDATE (date only), TIME (time only), or TIMESTAMP (date and time)NoTIMESTAMP

Example

To start with basic concept, let us create a simple table Students table in the TEST database and create a few records in that table as follows −

Step 1

Open a Command Prompt and change to the installation directory as follows −

C:\>
C:\>cd Program Files\MySQL\bin
C:\Program Files\MySQL\bin>

Step 2

Login to the database as follows −

C:\Program Files\MySQL\bin>mysql -u root -p
Enter password: ********
mysql>

Step 3

Create the Employee table in the TEST database as follows −

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

We will now create a few records in the Employee table as follows −

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>

Let us now write a JSP which will make use of the <sql:update> tag along with <sql:param> tag and the <sql:dataParam> tag to execute an SQL UPDATE statement to update the date of birth for Zara −

<%@ 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>

Access the above JSP, the following result will be displayed. The dob from 2002/05/16 to 2001/12/16 for the record with ID = 100 −

+-------------+----------------+-----------------+-----------------+
| Emp ID      | First Name     | Last Name       | DoB             |
+-------------+----------------+-----------------+-----------------+
| 100         | Zara           | Ali             | 2001-12-16      |
| 101         | Mahnaz         | Fatma           | 1978-11-28      |
| 102         | Zaid           | Khan            | 1980-10-10      |
| 103         | Sumit          | Mittal          | 1971-05-08      |
+-------------+----------------+-----------------+-----------------+
raja
Published on 25-Mar-2019 10:56:48
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