How to Delete a Table in MySQL
Consider a situation where we need to delete a table
from a database.
To delete a table from the database firstly we need to
make a connection with the database. When the connection has been established
pass a query for deleting a table inside the prepareStatement() method
and it will return the PreparedStatement object. Now call the method executeUpdate()
of the PreparedStatement interface which will helps us
to know the status of the program.
The code of the program is given below:
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.sql.*;
public class ServletDeletingTable extends HttpServlet{
public void doGet(HttpServletRequest request, HttpServletResponse response) throws
ServletException, IOException{
response.setContentType("text/html");
PrintWriter pw = response.getWriter();
String connectionURL = "jdbc:mysql://localhost/zulfiqar";
Connection connection;
try{
Class.forName("org.gjt.mm.mysql.Driver");
connection = DriverManager.getConnection(connectionURL, "root", "admin");
PreparedStatement pst = connection.prepareStatement("drop table emp_sal");
int i = pst.executeUpdate();
if (i==0){
pw.println("Table has been deleted");
}
else{
pw.println("Table has not been deleted");
}
}
catch(Exception e){
pw.println("The exception is " + e);
}
}
}
|
XML File for this program:
<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE web-app
PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd">
<web-app>
<servlet>
<servlet-name>Zulfiqar</servlet-name>
<servlet-class>ServletDeletingTable</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>Zulfiqar</servlet-name>
<url-pattern>/ServletDeletingTable</url-pattern>
</servlet-mapping>
</web-app>
|
Table in the database before deletion:
mysql> select * from emp_sa
+----------+--------+
| EmpName | salary |
+----------+--------+
| zulfiqar | 15000 |
| vinod | 12000 |
+----------+--------+
2 rows in set (0.00 sec) |
The output of the program is given below:
Table in the database after deletion:
mysql> select * from emp_sal;
ERROR 1146 (42S02): Table 'zulfiqar.emp_sal' doesn't exist |
Download this
program
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