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How to executes an SQL SELECT statement in a JSP?
The <sql:query> tag executes an SQL SELECT statement and saves the result in a scoped variable.
Attribute
The <sql:query> tag has the following attributes −
| Attribute | Description | Required | Default |
|---|---|---|---|
| sql | SQL command to execute (should return a ResultSet) | No | Body |
| dataSource | Database connection to use (overrides the default) | No | Default database |
| maxRows | Maximum number of results to store in the variable | No | Unlimited |
| startRow | Number of the row in the result at which to start recording | No | 0 |
| var | Name of the variable to represent the database | No | Set default |
| scope | Scope of variable to expose the result from the database | No | Page |
Example
To start with the basic concept, let us create an Employees table in the TEST database and create few records in that table as follows −
Follow these steps to create the Employees table −
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 Employees ( id int not null, age int not null, first varchar (255), last varchar (255) ); Query OK, 0 rows affected (0.08 sec) mysql>
Create Data Records
We will now create few records in the Employee table as follows −
mysql> INSERT INTO Employees VALUES (100, 18, 'Zara', 'Ali'); Query OK, 1 row affected (0.05 sec) mysql> INSERT INTO Employees VALUES (101, 25, 'Mahnaz', 'Fatma'); Query OK, 1 row affected (0.00 sec) mysql> INSERT INTO Employees VALUES (102, 30, 'Zaid', 'Khan'); Query OK, 1 row affected (0.00 sec) mysql> INSERT INTO Employees VALUES (103, 28, 'Sumit', 'Mittal'); Query OK, 1 row affected (0.00 sec) mysql>
Let us now create a JSP which will make use of <sql:query> to execute an SQL SELECT statement as follows −
<%@ page import = "java.io.*,java.util.*,java.sql.*"%>
<%@ page import = "javax.servlet.http.*,javax.servlet.*" %>
<%@ 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:query Tag</title>
</head>
<body>
<sql:setDataSource var = "snapshot" driver = "com.mysql.jdbc.Driver"
url = "jdbc:mysql://localhost/TEST"
user = "root" password = "pass123"/>
<sql:query dataSource = "${snapshot}" var = "result">
SELECT * from Employees;
</sql:query>
<table border = "1" width = "100%">
<tr>
<th>Emp ID</th>
<th>First Name</th>
<th>Last Name</th>
<th>Age</th>
</tr>
<c:forEach var = "row" items = "${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.age}"/></td>
</tr>
</c:forEach>
</table>
</body>
</html>Access the above JSP, which should display the following result −
+-------------+----------------+-----------------+-----------------+ | Emp ID | First Name | Last Name | Age | +-------------+----------------+-----------------+-----------------+ | 100 | Zara | Ali | 18 | | 101 | Mahnaz | Fatma | 25 | | 102 | Zaid | Khan | 30 | | 103 | Sumit | Mittal | 28 | +-------------+----------------+-----------------+-----------------+
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