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if not modules then modules = { } end modules ['libs-imp-sqlite'] = {
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"
}
-- c:/data/develop/tex-context/tex/texmf-win64/bin/lib/luametatex/lua/copies/sqlite/sqlite3.dll
local libname = "sqlite"
local libfile = "sqlite3"
local sqlitelib = resolvers.libraries.validoptional(libname)
if not sqlitelib then return end
local function okay()
if resolvers.libraries.optionalloaded(libname,libfile) then
okay = function() return true end
else
okay = function() return false end
end
return okay()
end
local next, tonumber = next, tonumber
local setmetatable = setmetatable
local formatters = string.formatters
local sql = utilities.sql or require("util-sql")
local report = logs.reporter(libname)
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 sqlite_open = sqlitelib.open
local sqlite_close = sqlitelib.close
local sqlite_execute = sqlitelib.execute
local sqlite_getmessage = sqlitelib.getmessage
local helpers = sql.helpers
local methods = sql.methods
local validspecification = helpers.validspecification
local preparetemplate = helpers.preparetemplate
local cache = { }
-- synchronous journal_mode locking_mode 1000 logger inserts
--
-- normal normal normal 6.8
-- off off normal 0.1
-- normal off normal 2.1
-- normal persist normal 5.8
-- normal truncate normal 4.2
-- normal truncate exclusive 4.1
local f_preamble = formatters[ [[
ATTACH `%s` AS `%s` ;
PRAGMA `%s`.synchronous = normal ;
]] ]
local function execute(specification)
if okay() then
if trace_sql then
report("executing sqlite")
end
if not validspecification(specification) then
report("error in specification")
end
local query = preparetemplate(specification)
if not query then
report("error in preparation")
return
end
local base = specification.database -- or specification.presets and specification.presets.database
if not base then
report("no database specified")
return
end
local filename = file.addsuffix(base,"db")
local result = { }
local keys = { }
local id = specification.id
local db = nil
local preamble = nil
if id then
local session = cache[id]
if session then
db = session.db
else
db = sqlite_open(filename)
preamble = f_preamble(filename,base,base)
if not db then
report("no session database specified")
else
cache[id] = {
name = filename,
db = db,
}
end
end
else
db = open_db(filename)
preamble = f_preamble(filename,base,base)
end
if not db then
report("no database opened")
else
local converter = specification.converter
local nofrows = 0
local callback = nil
if preamble then
query = preamble .. query -- only needed in open
end
if converter then
local convert = converter.sqlite
callback = function(nofcolumns,values,fields)
nofrows = nofrows + 1
result[nofrows] = convert(values)
end
else
callback = function(nofcolumns,values,fields)
local column = { }
for i=1,nofcolumns do
local field
if fields then
field = fields[i]
keys[i] = field
else
field = keys[i]
end
if field then
column[field] = values[i]
end
end
nofrows = nofrows + 1
result[nofrows] = column
end
end
local okay = sqlite_execute(db,query,callback)
if not okay then
report("error: %s",sqlite_getmessage(db))
-- elseif converter then
-- result = converter.sqlite(result)
end
end
if db and not id then
sqlite_close(db)
end
return result, keys
else
report("error: ","no library loaded")
end
end
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(cells)
-- %s (not needed)
-- %s (not needed)
return {
%s
}
end
]]
local celltemplate = "cells[%s]"
methods.sqlite = {
execute = execute,
usesfiles = false,
wraptemplate = wraptemplate,
celltemplate = celltemplate,
}
package.loaded["util-sql-imp-sqlite"] = methods.sqlite
package.loaded[libname] = methods.sqlite
return methods.sqlite
|