Access database query data in Java SCriptlet

Question

Question:
Creating a web page and plotting points on the page:
1) Database query results in decimal values latitude and longitude.
2) Perform calculations on lati. & long. in a <% java scriptlet %>
I don't know how to pass the data back and forth between the
java server page and the java scriplet.
After the calculation translates the latitude and longitude
into xpos and ypos, a data point is plotted on a map.
I tried many ways of doing it but am just guessing as
to how to pass the data.
Thanks in Advance. - John
Here is what I am trying so far .... see snippet below:
*** Query the database ***
<sql:query var="qryBio">
SELECT
DEC_LATITUDE,
DEC_LONGITUDE,
ENTRY_TIMESTAMP
FROM app.biosurvey where
</sql:query>
*** for each row retreived from the database ***
<c:forEach var="row" items="${qryBio.rows}">
<c:set var="latvar" value="${row.dec_latitude}" scope="page"/>
<c:set var="longvar" value="${row.dec_longitude} "scope="page" />
*** java code scriptlet - ***
*** convert latitude and longitude to xpos and ypos for display ***
<%
latitude = (Float)pageContext.getAttribute("latvar");
longitude = (Float)pageContext.getAttribute("longvar");
xpos = (int)Math.round(latitude);
ypos = (int)Math.round(longitude);
xpos = 1082 - xpos;
ypos = 700 + ypos;
pageContext.setAttribute("xpos", xpos);
pageContext.setAttribute("ypos", ypos);
%>
*** plot a point on the display html page overlaying the map ***
<IMG ID="Row" SRC="smallredbox.jpg" ALT="red box"
STYLE="position:absolute;
top:<%=xposMpls%> px;
left:<%=yposMpls%> px;
z-index:2">
</c:forEach>

Answer 1

Question:
Creating a web page and plotting points on the page:
1) Database query results in decimal values latitude and longitude.
2) Perform calculations on lati. & long. in a <% java scriptlet %>
I don't know how to pass the data back and forth between the
java server page and the java scriplet.
After the calculation translates the latitude and longitude
into xpos and ypos, a data point is plotted on a map.
I tried many ways of doing it but am just guessing as
to how to pass the data.
Thanks in Advance. - John
Here is what I am trying so far .... see snippet below:
*** Query the database ***
<sql:query var="qryBio">
SELECT
DEC_LATITUDE,
DEC_LONGITUDE,
ENTRY_TIMESTAMP
FROM app.biosurvey where
</sql:query>
*** for each row retreived from the database ***
<c:forEach var="row" items="${qryBio.rows}">
<c:set var="latvar" value="${row.dec_latitude}" scope="page"/>
<c:set var="longvar" value="${row.dec_longitude} "scope="page" />
*** java code scriptlet - ***
*** convert latitude and longitude to xpos and ypos for display ***
<%
latitude = (Float)pageContext.getAttribute("latvar");
longitude = (Float)pageContext.getAttribute("longvar");
xpos = (int)Math.round(latitude);
ypos = (int)Math.round(longitude);
xpos = 1082 - xpos;
ypos = 700 + ypos;
pageContext.setAttribute("xpos", xpos);
pageContext.setAttribute("ypos", ypos);
%>
*** plot a point on the display html page overlaying the map ***
<IMG ID="Row" SRC="smallredbox.jpg" ALT="red box"
STYLE="position:absolute;
top:<%=xposMpls%> px;
left:<%=yposMpls%> px;
z-index:2">
</c:forEach>