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Student-Admin-Redesign/sqlTest.java

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//package com.journaldev.jdbc.datasource;
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.*;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.sql.DataSource;
//@WebServlet("/JDBCDataSourceExample")
@WebServlet("/Test")
public class sqlTest extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
Context ctx = null; //context to pull var names from
Connection con = null; //initializes connection
Statement stmt = null; //initializes statement you send for sql
ResultSet rs = null; //initializes resultSet for sql
try{
ctx = new InitialContext();
DataSource ds = (DataSource) ctx.lookup("java:/comp/env/jdbc/LocalStudentAdminDB"); //jdbc lookup
con = ds.getConnection(); //connection from data source
stmt = con.createStatement(); //creates empty statement
rs = stmt.executeQuery("SELECT * FROM SA_Development.TERM"); //results from sql query
PrintWriter out = response.getWriter();
String resultantJSON = "["; //
ResultSetMetaData rsmd = rs.getMetaData(); //all information that isn't the result #cols #rows
int columnCount = rsmd.getColumnCount();
while(rs.next()){
String individualRow = "{";
for(int i=1; i < columnCount + 1;i++){
String name = rsmd.getColumnName(i);
if(rsmd.getColumnType(i)==java.sql.Types.INTEGER){
individualRow += "'" + name + "': '" + rs.getInt(name) + "',";
} else if (rsmd.getColumnType(i)==java.sql.Types.DATE){
individualRow += "'" + name + "': '" + rs.getDate(name) + "',";
} else if (rsmd.getColumnType(i)==java.sql.Types.VARCHAR){
individualRow += "'" + name + "': '" + rs.getString(name) + "',";
} else {
individualRow += "'" + name + "': '" + rs.getDate(name) + "',";
}
}
resultantJSON += individualRow + "},";
}
resultantJSON += "]";
response.setContentType("application/json");
out.print(resultantJSON);
/* response.setContentType("text/html");
out.print("<html><body><h2>SQLResults</h2>");
out.print("<table border=\"1\" cellspacing=10 cellpadding=5>");
out.print("<th>TERM_ID</th>");
out.print("<th>TERM_NAME</th>");
out.print("<th>ACTIVE_DATE_FROM</th>");
out.print("<th>ACTIVE_DATE_TO</th>");
while(rs.next())
{
out.print("<tr>");
out.print("<td>" + rs.getInt("TERM_ID") + "</td>");
out.print("<td>" + rs.getString("TERM_NAME") + "</td>");
out.print("<td>" + rs.getDate("ACTIVE_DATE_FROM") + "</td>");
out.print("<td>" + rs.getDate("ACTIVE_DATE_TO") + "</td>");
out.print("</tr>");
out.print(rs
}
out.print("</table></body><br/>");
//lets print some DB information
//out.print("<h3>Database Details</h3>");
//out.print("Database Product: "+con.getMetaData().getDatabaseProductName()+"<br/>");
//out.print("Database Driver: "+con.getMetaData().getDriverName());
//out.print("</html>");
*/
}catch(NamingException e){
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
}finally{
try {
rs.close();
stmt.close();
con.close();
ctx.close();
} catch (SQLException e) {
System.out.println("Exception in closing DB resources");
} catch (NamingException e) {
System.out.println("Exception in closing Context");
}
}
}
}