Typical database commands
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.sql.Statement;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class DatabaseServlet extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, java.io.IOException {
String sql = "select * from atable";
Connection conn = null;
Statement stmt = null;
ResultSet rs = null;
ResultSetMetaData rsm = null;
response.setContentType("text/html");
java.io.PrintWriter out = response.getWriter();
out
.println("<html><head><title>Typical Database Access</title></head><body>");
out.println("<h2>Database info</h2>");
out.println("<table border='1'><tr>");
try {
//load the database driver
Class.forName("oracle.jdbc.driver.OracleDriver");
//The JDBC URL for this Oracle database
String url = "jdbc:oracle:thin:@142.3.169.178:1521:ORCL";
//Create the java.sql.Connection to the database
conn = DriverManager.getConnection(url, "usr", "pass");
//Create a statement for executing some SQL
stmt = conn.createStatement();
rs = stmt.executeQuery(sql);
rsm = rs.getMetaData();
int colCount = rsm.getColumnCount();
//print column names
for (int i = 1; i <= colCount; ++i) {
out.println("<th>" + rsm.getColumnName(i) + "</th>");
}
out.println("</tr>");
while (rs.next()) {
out.println("<tr>");
for (int i = 1; i <= colCount; ++i)
out.println("<td>" + rs.getString(i) + "</td>");
out.println("</tr>");
}
} catch (Exception e) {
throw new ServletException(e.getMessage());
} finally {
try {
stmt.close();
conn.close();
} catch (SQLException sqle) {
}
}
out.println("</table><br><br>");
out.println("</body>");
out.println("</html>");
out.close();
} //doGet
}
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