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Commit d5bc58c3 authored by Sergey Lyubka's avatar Sergey Lyubka
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Using sqlite as an example

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<html> <?
<p>Prime numbers from 0 to 100, calculated by Lua:</p> -- Lua server pages have full control over the output, including HTTP
<? -- headers they send to the client. Send HTTP headers:
print('HTTP/1.0 200 OK\r\nContent-Type: text/html\r\n\r\n')
?><html><body>
function is_prime(n) <p>This is an example Lua server page served by
if n <= 0 then return false end <a href="http://code.google.com/p/mongoose">Mongoose web server</a>.
if n <= 2 then return true end Mongoose has Lua, Sqlite, and other functionality built in the binary.
if (n % 2 == 0) then return false end This example page stores the request in the Sqlite database, and shows
for i = 3, n / 2, 2 do all requests done previously.</p>
if (n % i == 0) then return false end
end
return true
end
for i = 1, 100 do <pre>
if is_prime(i) then print('<span>' .. i .. '</span>&nbsp;') end <?
end -- Open database
local db = sqlite3.open('requests.db')
?> -- Setup a trace callback, to show SQL statements we'll be executing.
-- db:trace(function(data, sql) print('Executing: ' .. sql .. '\n') end, nil)
<p>Reading POST data from Lua (click submit):</p> -- Create a table if it is not created already
<form method="POST"><input type="text" name="t1"/><input type="submit"></form> db:exec([[
CREATE TABLE IF NOT EXISTS requests (
id INTEGER PRIMARY KEY AUTOINCREMENT,
timestamp NOT NULL,
method NOT NULL,
uri NOT NULL,
user_agent
);
]])
<pre> -- Add entry about this request
POST data: [<? post_data = read() print(post_data) ?>] local stmt = db:prepare(
request method: [<? print(request_info.request_method) ?>] 'INSERT INTO requests VALUES(NULL, datetime("now"), ?, ?, ?);');
IP/port: [<? print(request_info.remote_ip, ':', request_info.remote_port) ?>] stmt:bind_values(request_info.request_method, request_info.uri,
URI: [<? print(request_info.uri) ?>] request_info.http_headers['User-Agent'])
HTTP version [<? print(request_info.http_version) ?>] stmt:step()
HEADERS: stmt:finalize()
<?
for name, value in pairs(request_info.http_headers) do
print(name, ':', value, '\n')
end
?>
</pre>
-- Show all previous records
print('Previous requests:\n')
stmt = db:prepare('SELECT * FROM requests ORDER BY id DESC;')
while stmt:step() == sqlite3.ROW do
local v = stmt:get_values()
print(v[1] .. ' ' .. v[2] .. ' ' .. v[3] .. ' '
.. v[4] .. ' ' .. v[5] .. '\n')
end
</html> -- Close database
db:close()
?>
</pre></body></html>
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