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if not modules then modules = { } end modules ['util-sql-imp-swiglib'] = {
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"
}
-- As the regular library is flawed (i.e. there are crashes in the table
-- construction code) and also not that efficient, Luigi Scarso looked into
-- a swig binding. This is a bit more low level approach but as we stay
-- closer to the original library it's also less dependant.
local concat = table.concat
local format, byte = string.format, string.byte
local lpegmatch = lpeg.match
local setmetatable, type = setmetatable, type
local sleep = os.sleep
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","swiglib")
local helpers = require("swiglib.helpers.core")
local sql = utilities.sql
local mysql = require("swiglib.mysql.core") -- "5.6.14"
----- mysql = swiglib("mysql.core") -- "5.6.14"
local new_u_char_array = helpers.new_u_char_array or helpers.new_ucharArray
local ucharArray_setitem = helpers.u_char_array_setitem or helpers.ucharArray_setitem
local int_p_assign = helpers.int_p_assign
local ulongArray_getitem = helpers.u_long_array_getitem or helpers.ulongArray_getitem
-- inspect(table.sortedkeys(mysql))
local nofretries = 5
local retrydelay = 1
local cache = { }
local helpers = sql.helpers
local methods = sql.methods
local validspecification = helpers.validspecification
local querysplitter = helpers.querysplitter
local dataprepared = helpers.preparetemplate
local serialize = sql.serialize
local deserialize = sql.deserialize
local mysql_initialize = mysql.mysql_init
local mysql_open_connection = mysql.mysql_real_connect
local mysql_execute_query = mysql.mysql_real_query
local mysql_close_connection = mysql.mysql_close
local mysql_field_seek = mysql.mysql_field_seek
local mysql_num_fields = mysql.mysql_num_fields
local mysql_fetch_field = mysql.mysql_fetch_field
local mysql_num_rows = mysql.mysql_num_rows
local mysql_fetch_row = mysql.mysql_fetch_row
local mysql_fetch_lengths = mysql.mysql_fetch_lengths
local mysql_init = mysql.mysql_init
local mysql_store_result = mysql.mysql_store_result
local mysql_free_result = mysql.mysql_free_result
local mysql_use_result = mysql.mysql_use_result
local mysql_error_message = mysql.mysql_error
----- mysql_options_argument = mysql.mysql_options_argument
local instance = mysql.MYSQL()
local mysql_constant_false = false
local mysql_constant_true = true
----- util_getbytearray = mysql.util_getbytearray
-- if mysql_options_argument then
--
-- mysql_constant_false = mysql_options_argument(false) -- 0 "\0"
-- mysql_constant_true = mysql_options_argument(true) -- 1 "\1"
--
-- -- print(swig_type(mysql_constant_false))
-- -- print(swig_type(mysql_constant_true))
--
-- mysql.mysql_options(instance,mysql.MYSQL_OPT_RECONNECT,mysql_constant_true);
--
-- else
--
-- print("")
-- print("incomplete swiglib.mysql interface")
-- print("")
--
-- end
-- some helpers:
function mysql.options_argument(arg)
local targ = type(arg)
if targ == "boolean" then
local o = new_u_char_array(1)
ucharArray_setitem(o,0,arg == true and 64 or 0)
return o
elseif targ == "string" then
local o = new_u_char_array(#arg)
ucharArray_setitem(o,0,0)
for i=1,#arg do
ucharArray_setitem(o,i-1,byte(arg,i))
end
return o
elseif targ == "number" then
local o = core.new_int_p()
int_p_assign(o, arg)
return o
else
return nil
end
end
-- function mysql.util_unpackbytearray(row,noffields,len)
-- if row == nil then
-- return { }
-- elseif noffields < 1 then
-- return { }
-- else
-- local t = { }
-- for i=0,noffields-1 do
-- local l = ulongArray_getitem(len,i) -- zero based ... element from len array
-- local r = util_getbytearray(row,i,l) -- zero based ... element from len array
-- t[#t+1]= r
-- end
-- return t
-- end
-- end
--
-- local typemap = mysql.MYSQL_TYPE_VAR_STRING and {
-- [mysql.MYSQL_TYPE_VAR_STRING ] = "string",
-- [mysql.MYSQL_TYPE_STRING ] = "string",
-- [mysql.MYSQL_TYPE_DECIMAL ] = "number",
-- [mysql.MYSQL_TYPE_SHORT ] = "number",
-- [mysql.MYSQL_TYPE_LONG ] = "number",
-- [mysql.MYSQL_TYPE_FLOAT ] = "number",
-- [mysql.MYSQL_TYPE_DOUBLE ] = "number",
-- [mysql.MYSQL_TYPE_LONGLONG ] = "number",
-- [mysql.MYSQL_TYPE_INT24 ] = "number",
-- [mysql.MYSQL_TYPE_YEAR ] = "number",
-- [mysql.MYSQL_TYPE_TINY ] = "number",
-- [mysql.MYSQL_TYPE_TINY_BLOB ] = "binary",
-- [mysql.MYSQL_TYPE_MEDIUM_BLOB] = "binary",
-- [mysql.MYSQL_TYPE_LONG_BLOB ] = "binary",
-- [mysql.MYSQL_TYPE_BLOB ] = "binary",
-- [mysql.MYSQL_TYPE_DATE ] = "date",
-- [mysql.MYSQL_TYPE_NEWDATE ] = "date",
-- [mysql.MYSQL_TYPE_DATETIME ] = "datetime",
-- [mysql.MYSQL_TYPE_TIME ] = "time",
-- [mysql.MYSQL_TYPE_TIMESTAMP ] = "time",
-- [mysql.MYSQL_TYPE_ENUM ] = "set",
-- [mysql.MYSQL_TYPE_SET ] = "set",
-- [mysql.MYSQL_TYPE_NULL ] = "null",
-- }
-- real_escape_string
local function finish(t)
local r = t._result_
if r then
mysql_free_result(r)
end
end
-- will become metatable magic
-- local function analyze(result)
-- mysql_field_seek(result,0)
-- local nofrows = mysql_num_rows(result) or 0
-- local noffields = mysql_num_fields(result)
-- local names = { }
-- local types = { }
-- for i=1,noffields do
-- local field = mysql_fetch_field(result)
-- names[i] = field.name
-- types[i] = field.type
-- end
-- return names, types, noffields, nofrows
-- end
local function getcolnames(t)
return t.names
end
local function getcoltypes(t)
return t.types
end
local function numrows(t)
return t.nofrows
end
local fetch_fields_from_current_row = mysql.util_mysql_fetch_fields_from_current_row
local fetch_all_rows = mysql.util_mysql_fetch_all_rows
-- swig_type
-- local function list(t)
-- local result = t._result_
-- local row = mysql_fetch_row(result)
-- local len = mysql_fetch_lengths(result)
-- local result = { }
-- for i=1,t.noffields do
-- local r = i - 1 -- zero offset
-- result[i] = util_getbytearray(row,r,ulongArray_getitem(len,r))
-- end
-- return result
-- end
-- local function hash(t)
-- local list = fetch_fields_from_current_row(t._result_)
-- local result = t._result_
-- local fields = t.names
-- local row = mysql_fetch_row(result)
-- local len = mysql_fetch_lengths(result)
-- local result = { }
-- for i=1,t.noffields do
-- local r = i - 1 -- zero offset
-- result[fields[i]] = util_getbytearray(row,r,ulongArray_getitem(len,r))
-- end
-- return result
-- end
local function list(t)
return fetch_fields_from_current_row(t._result_)
end
local function hash(t)
local list = fetch_fields_from_current_row(t._result_)
local fields = t.names
local data = { }
for i=1,t.noffields do
data[fields[i]] = list[i]
end
return data
end
local function wholelist(t)
return fetch_all_rows(t._result_)
end
local mt = { __index = {
-- regular
finish = finish,
list = list,
hash = hash,
wholelist = wholelist,
-- compatibility
numrows = numrows,
getcolnames = getcolnames,
getcoltypes = getcoltypes,
-- fallback
_result_ = nil,
names = { },
types = { },
noffields = 0,
nofrows = 0,
}
}
local nt = setmetatable({},mt)
-- session
local function close(t)
mysql_close_connection(t._connection_)
end
local function execute(t,query)
if query and query ~= "" then
local connection = t._connection_
local result = mysql_execute_query(connection,query,#query)
if result == 0 then
local result = mysql_store_result(connection)
if result then
mysql_field_seek(result,0)
local nofrows = mysql_num_rows(result) or 0
local noffields = mysql_num_fields(result)
local names = { }
local types = { }
for i=1,noffields do
local field = mysql_fetch_field(result)
names[i] = field.name
types[i] = field.type
end
local t = {
_result_ = result,
names = names,
types = types,
noffields = noffields,
nofrows = nofrows,
}
return setmetatable(t,mt)
else
return nt
end
end
end
return false
end
local mt = { __index = {
close = close,
execute = execute,
}
}
local function open(t,database,username,password,host,port)
local connection = mysql_open_connection(t._session_,host or "localhost",username or "",password or "",database or "",port or 0,0,0)
if connection then
local t = {
_connection_ = connection,
}
return setmetatable(t,mt)
end
end
local function message(t)
return mysql_error_message(t._session_)
end
local function close(t)
-- dummy, as we have a global session
end
local mt = {
__index = {
connect = open,
close = close,
message = message,
}
}
local function initialize()
local session = {
_session_ = mysql_initialize(instance) -- maybe share, single thread anyway
}
return setmetatable(session,mt)
end
-- -- -- --
local function connect(session,specification)
return session:connect(
specification.database or "",
specification.username or "",
specification.password or "",
specification.host or "",
specification.port
)
end
local function error_in_connection(specification,action)
report_state("error in connection: [%s] %s@%s to %s:%s",
action or "unknown",
specification.database or "no database",
specification.username or "no username",
specification.host or "no host",
specification.port or "no port"
)
end
local function datafetched(specification,query,converter)
if not query or query == "" then
report_state("no valid query")
return { }, { }
end
local id = specification.id
local session, connection
if id then
local c = cache[id]
if c then
session = c.session
connection = c.connection
end
if not connection then
session = initialize()
connection = connect(session,specification)
if not connection then
for i=1,nofretries do
sleep(retrydelay)
report_state("retrying to connect: [%s.%s] %s@%s to %s:%s",
id,i,
specification.database or "no database",
specification.username or "no username",
specification.host or "no host",
specification.port or "no port"
)
connection = connect(session,specification)
if connection then
break
end
end
end
if connection then
cache[id] = { session = session, connection = connection }
end
end
else
session = initialize()
connection = connect(session,specification)
if not connection then
for i=1,nofretries do
sleep(retrydelay)
report_state("retrying to connect: [%s] %s@%s to %s:%s",
i,
specification.database or "no database",
specification.username or "no username",
specification.host or "no host",
specification.port or "no port"
)
connection = connect(session,specification)
if connection then
break
end
end
end
end
if not connection then
report_state("error in connection: %s@%s to %s:%s",
specification.database or "no database",
specification.username or "no username",
specification.host or "no host",
specification.port or "no port"
)
return { }, { }
end
query = lpegmatch(querysplitter,query)
local result, message, okay
for i=1,#query do
local q = query[i]
local r, m = connection:execute(q)
if m then
report_state("error in query, stage: %s",string.collapsespaces(q))
message = message and format("%s\n%s",message,m) or m
end
if type(r) == "table" then
result = r
okay = true
elseif not m then
okay = true
end
end
local data, keys
if result then
if converter then
data = converter.swiglib(result)
else
keys = result.names
data = { }
for i=1,result.nofrows do
data[i] = result:hash()
end
end
result:finish() -- result:close()
elseif message then
report_state("message %s",message)
end
if not keys then
keys = { }
end
if not data then
data = { }
end
if not id then
connection:close()
session:close()
end
return data, keys
end
local function execute(specification)
if trace_sql then
report_state("executing library")
end
if not validspecification(specification) then
report_state("error in specification")
return
end
local query = dataprepared(specification)
if not query then
report_state("error in preparation")
return
end
local data, keys = datafetched(specification,query,specification.converter)
if not data then
report_state("error in fetching")
return
end
local one = data[1]
if one then
setmetatable(data,{ __index = one } )
end
return data, keys
end
local wraptemplate = [[
local mysql = require("swiglib.mysql.core") -- will be stored in method
local fetch_fields = mysql.util_mysql_fetch_fields_from_current_row
local converters = utilities.sql.converters
local deserialize = utilities.sql.deserialize
local tostring = tostring
local tonumber = tonumber
local booleanstring = string.booleanstring
%s
return function(result)
if not result then
return { }
end
local nofrows = result.nofrows or 0
if nofrows == 0 then
return { }
end
local noffields = result.noffields or 0
local target = { } -- no %s needed here
result = result._result_
for i=1,nofrows do
local cells = fetch_fields(result)
target[%s] = {
%s
}
end
return target
end
]]
local celltemplate = "cells[%s]"
methods.swiglib = {
runner = function() end, -- never called
execute = execute,
initialize = initialize, -- returns session
usesfiles = false,
wraptemplate = wraptemplate,
celltemplate = celltemplate,
}
|