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Tag
JSP Standard Tag Library
The tag is used to run SQL SELECT statements and to store the results in a scope variable.
Syntax
<sql:query
var=""
scope=""
sql=""
dataSource=""
startRow=""
maxRows=""/>
Attributes
The tag has the following attributes:
Attribute Description Required Default
sql The SQL command to execute (returns a ResultSet object) No Body
dataSource The database connection to use (overrides the default) No Default database
maxRows Maximum number of results to store in the variable No Unlimited
startRow The row number to start retrieving results from No 0
var The variable representing the database results No Default setting
scope The scope of the var attribute No Page
Program Example
First, you need to create an Employees table in the TEST database and then add a few records to it. 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 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:
Finally, create a few records in the Employees table:
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>
Now, write a JSP file that uses the tag to execute an SQL SELECT statement:
JSTL sql:query Tag
SELECT * from Employees;
| Emp ID |
First Name |
Last Name |
Age |
|
|
|
|
The result is as follows:
JSP Standard Tag Library
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Eclipse JSP/Servlet
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JSP Standard Tag Library (JSTL)
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