/**
* Initialize Servlet Parameters Take Database Driver, Conenction URL and User from
* /WEB-INF/web.xml.<br>
* If any parameter is not found then look it up at hipergate.cnf Properties file using
* Environment singleton.
*
* @throws ServletException
* @throws UnavailableException If jdbcDriverClassName parameter is not found and driver property
* at hipergate.cnf is not found or if jdbcURL parameter is not found and dburl property at
* hipergate.cnf is not found.
* @see com.knowgate.misc.Environment
*/
public void init() throws ServletException {
ServletConfig config = getServletConfig();
jdbcDriverClassName = config.getInitParameter("jdbcDriverClassName");
jdbcURL = config.getInitParameter("jdbcURL");
dbUserName = config.getInitParameter("dbUserName");
dbUserPassword = config.getInitParameter("dbUserPassword");
if (isVoid(jdbcDriverClassName)
|| isVoid(jdbcURL)
|| isVoid(dbUserName)
|| isVoid(dbUserPassword)) {
Properties env = Environment.getProfile("hipergate");
if (isVoid(jdbcDriverClassName)) jdbcDriverClassName = env.getProperty("driver");
if (isVoid(jdbcURL)) jdbcURL = env.getProperty("dburl");
if (isVoid(dbUserName)) dbUserName = env.getProperty("dbuser");
if (isVoid(dbUserPassword)) dbUserPassword = env.getProperty("dbpassword");
}
if (jdbcDriverClassName == null || jdbcURL == null)
throw new UnavailableException("Init params missing");
} // init()
/**
* Get Query By Form results throught response output stream.
*
* @param queryspec Name of XML file containing the Query Specification
* @param columnlist List of comma separated column names to retrieve
* @param where SQL WHERE clause to apply
* @param order by SQL ORDER BY clause to apply
* @param showas Output format. One of { "CSV" <i>(comma separated)</i>, "TSV" <i>(tabbed
* separated)</i>, "XLS" <i>(Excel)</i> }
* @throws IOException
* @throws FileNotFoundException
* @throws ServletException
*/
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws IOException, FileNotFoundException, ServletException {
Class oDriver;
Connection oConn = null;
ServletOutputStream oOut = response.getOutputStream();
QueryByForm oQBF;
String sQuerySpec;
String sColumnList;
String sWhere;
String sOrderBy;
String sShowAs;
String sStorage;
if (DebugFile.trace) {
DebugFile.writeln("Begin HttpQueryServlet.doGet(...)");
DebugFile.incIdent();
}
sStorage = Environment.getProfileVar("hipergate", "storage");
if (DebugFile.trace) DebugFile.writeln("storage=" + sStorage);
try {
oDriver = Class.forName(jdbcDriverClassName);
} catch (ClassNotFoundException ignore) {
oDriver = null;
if (DebugFile.trace)
DebugFile.writeln("Class.forName(" + jdbcDriverClassName + ") : " + ignore.getMessage());
response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, "Database driver not found");
}
if (null == oDriver) return;
try {
sQuerySpec = request.getParameter("queryspec");
sColumnList = request.getParameter("columnlist");
if (null == sColumnList) sColumnList = "*";
sWhere = request.getParameter("where");
if (null == sWhere) sWhere = "1=1";
sOrderBy = request.getParameter("orderby");
if (null == sOrderBy) sOrderBy = "";
sShowAs = request.getParameter("showas");
if (null == sShowAs) sShowAs = "CSV";
if (DebugFile.trace)
DebugFile.writeln("queryspec=" + sQuerySpec != null ? sQuerySpec : "null");
if (DebugFile.trace) DebugFile.writeln("where=" + sWhere);
if (DebugFile.trace) DebugFile.writeln("orderby=" + sOrderBy);
if (hasSqlSignature(sColumnList)) {
response.sendError(HttpServletResponse.SC_BAD_REQUEST, "Invalid Column List Syntax");
return;
}
oQBF = new QueryByForm("file://" + sStorage + "/qbf/" + sQuerySpec + ".xml");
if (DebugFile.trace) DebugFile.writeln("DriverManager.getConnection(" + jdbcURL + ",...)");
oConn = DriverManager.getConnection(jdbcURL, dbUserName, dbUserPassword);
// Send some basic http headers to support binary d/l.
if (sShowAs.equalsIgnoreCase("XLS")) {
response.setContentType("application/x-msexcel");
response.setHeader(
"Content-Disposition",
"inline; filename=\"" + oQBF.getTitle(request.getLocale().getLanguage()) + " 1.csv\"");
} else if (sShowAs.equalsIgnoreCase("CSV")) {
response.setContentType("text/plain");
response.setHeader(
"Content-Disposition",
"attachment; filename=\""
+ oQBF.getTitle(request.getLocale().getLanguage())
+ " 1.csv\"");
} else if (sShowAs.equalsIgnoreCase("TSV")) {
response.setContentType("text/tab-separated-values");
response.setHeader(
"Content-Disposition",
"attachment; filename=\""
+ oQBF.getTitle(request.getLocale().getLanguage())
+ " 1.tsv\"");
} else {
response.setContentType("text/plain");
response.setHeader(
"Content-Disposition",
"inline; filename=\"" + oQBF.getTitle(request.getLocale().getLanguage()) + " 1.txt\"");
}
if (0 == sOrderBy.length())
oQBF.queryToStream(
oConn, sColumnList, oQBF.getBaseFilter(request) + " " + sWhere, oOut, sShowAs);
else
oQBF.queryToStream(
oConn,
sColumnList,
oQBF.getBaseFilter(request) + " " + sWhere + " ORDER BY " + sOrderBy,
oOut,
sShowAs);
oConn.close();
oConn = null;
oOut.flush();
} catch (SQLException e) {
if (DebugFile.trace) DebugFile.writeln("SQLException " + e.getMessage());
response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, e.getMessage());
} catch (ClassNotFoundException e) {
if (DebugFile.trace) DebugFile.writeln("ClassNotFoundException " + e.getMessage());
response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, e.getMessage());
} catch (IllegalAccessException e) {
if (DebugFile.trace) DebugFile.writeln("IllegalAccessException " + e.getMessage());
response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, e.getMessage());
} catch (Exception e) {
if (DebugFile.trace) DebugFile.writeln("Exception " + e.getMessage());
response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, e.getMessage());
} finally {
try {
if (null != oConn) if (!oConn.isClosed()) oConn.close();
} catch (SQLException e) {
if (DebugFile.trace) DebugFile.writeln("SQLException " + e.getMessage());
}
}
if (DebugFile.trace) {
DebugFile.decIdent();
DebugFile.writeln("End HttpQueryServlet.doGet()");
}
} // doGet()
