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if not modules then modules = { } end modules ['util-sql'] = {
version = 1.001,
comment = "companion to m-sql.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
local format = string.format
local P, V, Ct, Cs, Cc, Cg, Cf, patterns, lpegmatch = lpeg.P, lpeg.V, lpeg.Ct, lpeg.Cs, lpeg.Cc, lpeg.Cg, lpeg.Cf, lpeg.patterns, lpeg.match
local trace_sql = false trackers.register("sql.trace",function(v) trace_sql = v end)
local report_state = logs.reporter("sql")
utilities.sql = utilities.sql or { }
local sql = utilities.sql
local inifile = ""
-- todo:
if os.platform == "mswin" then
inifile = "C:\\Program Files\\MySQL\\MySQL Server 5.5\\ld-test.ini"
else
inifile = "/etc/mysql/ld-test.ini"
end
local separator = P("\t")
local newline = patterns.newline
local entry = Cs((1-separator-newline)^1)
local empty = Cc("")
local getfirst = Ct( entry * (separator * (entry+empty))^0) + newline
local skipfirst = (1-newline)^1 * newline
-- -- faster but less flexible:
--
-- local splitter = Ct ( (getfirst)^1 )
--
-- local function splitdata(data)
-- return lpegmatch(splitter,data) or { }
-- end
local function splitdata(data)
if data == "" then
if trace_sql then
report_state("no data")
end
return { }
end
local t = lpegmatch(getfirst,data) or { }
if #t == 0 then
if trace_sql then
report_state("no banner")
end
return { }
end
-- quite generic, could be a helper
local p = nil
for i=1,#t do
local ti = t[i]
if trace_sql then
report_state("field %s has name %q",i,ti)
end
local s = Cg(Cc(ti) * entry)
if p then
p = p * s
else
p = s
end
if i < #t then
p = p * separator
end
end
p = Cf(Ct("") * p,rawset) * newline^0
local d = lpegmatch(skipfirst * Ct(p^0),data)
return d or { }
end
local function preparedata(sqlfile,templatefile,mapping)
local query = utilities.templates.load(templatefile,mapping)
io.savedata(sqlfile,query)
end
local function fetchdata(sqlfile,datfile)
local command
if inifile ~= "" then
command = format([[mysql --defaults-extra-file="%s" < %s > %s]],inifile,sqlfile,datfile)
else
command = format([[[mysql < %s > %s]],sqlfile,datfile)
end
if trace_sql then
local t = os.clock()
os.execute(command)
report_state("fetchtime: %.3f sec",os.clock()-t) -- not okay under linux
else
os.execute(command)
end
end
local function loaddata(datfile)
if trace_sql then
local t = os.clock()
local data = io.loaddata(datfile) or ""
report_state("datasize: %.3f MB",#data/1024/1024)
report_state("loadtime: %.3f sec",os.clock()-t)
return data
else
return io.loaddata(datfile) or ""
end
end
local function convertdata(data)
if trace_sql then
local t = os.clock()
data = splitdata(data)
report_state("converttime: %.3f",os.clock()-t)
report_state("entries: %s ",#data) -- #data-1 if indexed
else
return splitdata(data)
end
end
-- todo: new, etc
function sql.fetch(templatefile,mapping)
local sqlfile = file.nameonly(templatefile) .. "-temp.sql"
local datfile = file.nameonly(templatefile) .. "-temp.dat"
preparedata(sqlfile,templatefile,mapping)
fetchdata(sqlfile,datfile)
local data = loaddata(datfile)
data = convertdata(data)
return data
end
function sql.reuse(templatefile)
local datfile = file.nameonly(templatefile) .. "-temp.dat"
local data = loaddata(datfile)
data = convertdata(data)
return data
end
-- tex specific
if tex then
function sql.prepare(sqlfile,mapping)
if tex.systemmodes["first"] then
return utilities.sql.fetch(sqlfile,mapping)
else
return utilities.sql.reuse(sqlfile)
end
end
else
sql.prepare = utilities.sql.fetch
end
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