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if not modules then modules = { } end modules ['util-sql-imp-client'] = {
version = 1.001,
comment = "companion to util-sql.lua",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
-- todo: make a converter
local rawset, setmetatable = rawset, setmetatable
local P, S, V, C, Cs, Ct, Cc, Cg, Cf, patterns, lpegmatch = lpeg.P, lpeg.S, lpeg.V, lpeg.C, lpeg.Cs, lpeg.Ct, 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 trace_queries = false trackers.register("sql.queries",function(v) trace_queries = v end)
local report_state = logs.reporter("sql","client")
local sql = utilities.sql
local helpers = sql.helpers
local methods = sql.methods
local validspecification = helpers.validspecification
local preparetemplate = helpers.preparetemplate
local splitdata = helpers.splitdata
local replacetemplate = utilities.templates.replace
local serialize = sql.serialize
local deserialize = sql.deserialize
local getserver = sql.getserver
local osclock = os.gettimeofday
-- Experiments with an p/action demonstrated that there is not much gain. We could do a runtime
-- capture but creating all the small tables is not faster and it doesn't work well anyway.
local separator = P("\t")
local newline = patterns.newline
local empty = Cc("")
local entry = C((1-separator-newline)^0) -- C 10% faster than Cs
local unescaped = P("\\n") / "\n"
+ P("\\t") / "\t"
+ P("\\0") / "\000"
+ P("\\\\") / "\\"
local entry = Cs((unescaped + (1-separator-newline))^0) -- C 10% faster than Cs but Cs needed due to nesting
local getfirst = Ct( entry * (separator * (entry+empty))^0) + newline
local skipfirst = (1-newline)^1 * newline
local skipdashes = (P("-")+separator)^1 * newline
local getfirstline = C((1-newline)^0)
local cache = { }
local function splitdata(data) -- todo: hash on first line ... maybe move to client module
if data == "" then
if trace_sql then
report_state("no data")
end
return { }, { }
end
local first = lpegmatch(getfirstline,data)
if not first then
if trace_sql then
report_state("no data")
end
return { }, { }
end
local p = cache[first]
if p then
-- report_state("reusing: %s",first)
local entries = lpegmatch(p.parser,data)
return entries or { }, p.keys
elseif p == false then
return { }, { }
elseif p == nil then
local keys = lpegmatch(getfirst,first) or { }
if #keys == 0 then
if trace_sql then
report_state("no banner")
end
cache[first] = false
return { }, { }
end
-- quite generic, could be a helper
local n = #keys
if n == 0 then
report_state("no fields")
cache[first] = false
return { }, { }
end
if n == 1 then
local key = keys[1]
if trace_sql then
report_state("one field with name %a",key)
end
p = Cg(Cc(key) * entry)
else
for i=1,n do
local key = keys[i]
if trace_sql then
report_state("field %s has name %a",i,key)
end
local s = Cg(Cc(key) * entry)
if p then
p = p * separator * s
else
p = s
end
end
end
p = Cf(Ct("") * p,rawset) * newline^1
if getserver() == "mssql" then
p = skipfirst * skipdashes * Ct(p^0)
else
p = skipfirst * Ct(p^0)
end
cache[first] = { parser = p, keys = keys }
local entries = lpegmatch(p,data)
return entries or { }, keys
end
end
local splitter = skipfirst * Ct((Ct(entry * (separator * entry)^0) * newline^1)^0)
local function getdata(data)
return lpegmatch(splitter,data)
end
helpers.splitdata = splitdata
helpers.getdata = getdata
local t_runner = {
mysql = [[mysql --batch --user="%username%" --password="%password%" --host="%host%" --port=%port% --database="%database%" --default-character-set=utf8 < "%queryfile%" > "%resultfile%"]],
mssql = [[sqlcmd -S %host% %?U: -U "%username%" ?% %?P: -P "%password%" ?% -I -W -w 65535 -s"]] .. "\t" .. [[" -m 1 -i "%queryfile%" -o "%resultfile%"]],
}
local t_runner_login = {
mysql = [[mysql --login-path="%login%" --batch --database="%database%" --default-character-set=utf8 < "%queryfile%" > "%resultfile%"]],
mssql = [[sqlcmd -S %host% %?U: -U "%username%" ?% %?P: -P "%password%" ?% -I -W -w 65535 -s"]] .. "\t" .. [[" -m 1 -i "%queryfile%" -o "%resultfile%"]],
}
local t_preamble = {
mysql = [[
SET GLOBAL SQL_MODE=ANSI_QUOTES;
]],
mssql = [[
:setvar SQLCMDERRORLEVEL 1
SET QUOTED_IDENTIFIER ON;
SET NOCOUNT ON;
%?database: USE %database%; ?%
]],
}
local function dataprepared(specification)
local query = preparetemplate(specification)
if query then
local preamble = t_preamble[getserver()] or t_preamble.mysql
if preamble then
preamble = replacetemplate(preamble,specification.variables,'sql')
query = preamble .. "\n" .. query
end
io.savedata(specification.queryfile,query)
os.remove(specification.resultfile)
if trace_queries then
report_state("query: %s",query)
end
return true
else
-- maybe push an error
os.remove(specification.queryfile)
os.remove(specification.resultfile)
end
end
local function datafetched(specification)
local runner = (specification.login and t_runner_login or t_runner)[getserver()] or t_runner.mysql
local command = replacetemplate(runner,specification)
if trace_sql then
local t = osclock()
report_state("command: %s",command)
-- for now we don't use sandbox.registerrunners as this module is
-- also used outside context
local okay = os.execute(command)
report_state("fetchtime: %.3f sec, return code: %i",osclock()-t,okay) -- not okay under linux
return okay == 0
else
return os.execute(command) == 0
end
end
local function dataloaded(specification)
if trace_sql then
local t = osclock()
local data = io.loaddata(specification.resultfile) or ""
report_state("datasize: %.3f MB",#data/1024/1024)
report_state("loadtime: %.3f sec",osclock()-t)
return data
else
return io.loaddata(specification.resultfile) or ""
end
end
local function dataconverted(data,converter)
if converter then
local data = getdata(data)
if data then
data = converter.client(data)
end
return data
elseif trace_sql then
local t = osclock()
local data, keys = splitdata(data,target)
report_state("converttime: %.3f",osclock()-t)
report_state("keys: %s ",#keys)
report_state("entries: %s ",#data)
return data, keys
else
return splitdata(data)
end
end
-- todo: new, etc
local function execute(specification)
if trace_sql then
report_state("executing client")
end
if not validspecification(specification) then
report_state("error in specification")
return
end
if not dataprepared(specification) then
report_state("error in preparation")
return
end
if not datafetched(specification) then
report_state("error in fetching, query: %s",string.collapsespaces(io.loaddata(specification.queryfile) or "?"))
return
end
local data = dataloaded(specification)
if not data then
report_state("error in loading")
return
end
local data, keys = dataconverted(data,specification.converter)
if not data then
report_state("error in converting or no data")
return
end
local one = data[1]
if one then
setmetatable(data,{ __index = one } )
end
return data, keys
end
-- The following is not that (memory) efficient but normally we will use
-- the lib anyway. Of course we could make a dedicated converter and/or
-- hook into the splitter code but ... it makes not much sense because then
-- we can as well move the builder to the library modules.
--
-- Here we reuse data as the indexes are the same, unless we hash.
local wraptemplate = [[
local converters = utilities.sql.converters
local deserialize = utilities.sql.deserialize
local tostring = tostring
local tonumber = tonumber
local booleanstring = string.booleanstring
%s
return function(data)
local target = %s -- data or { }
for i=1,#data do
local cells = data[i]
target[%s] = {
%s
}
end
return target
end
]]
local celltemplate = "cells[%s]"
methods.client = {
execute = execute,
usesfiles = true,
wraptemplate = wraptemplate,
celltemplate = celltemplate,
}
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