巨大的json对象出类拔萃？
我有一个PHP应用程序，它有一个超过10000行的表，我试图通过我的ROR应用程序将其导出到excel表，但我的请求是通过PHP应用程序在服务器上超时。所以我想知道是否有任何优雅的方式来解决这个问题。 我想出了两个解决方案。 首先是进行批处理（需要阅读我的新内容），另一个是我的php应用程序将发送一个大的json对象，我的ruby应用程序将读取json对象将数据写入excel表并发回excel sheet。所以我想问一下是否有更好的方法来处理这个问题？ 我怎样才能将json转换为excel我做了google并且确实找到了excel到json但反之亦然。 有什么建议？
我有一些时间所以我在ruby1.9中构建了一个json来excel csv转换器：
它从一个文件中读取并将其写入另一个文件。
json2excel.rb
def json2excel(fromFile, toFile) pos = 0 while true c = fromFile.read(1);pos += 1 if c == ' ' or c == "\n" or c == "\r" # whitespace elsif c == '[' # first bracket begins! attributes = [] while true c = fromFile.read(1);pos += 1 if c == '{' # now an object starts object = Hash.new while true puts "!!!" c = fromFile.read(1);pos += 1 if c == '"' # new attribute starts name = "" while true c = fromFile.read(1);pos += 1 if c == '"' break else name += c end end attributes << name unless attributes.include? name # scan for : while true c = fromFile.read(1);pos += 1 if c == ':' break elsif c == ' ' or c == '\n' or c == '\r' # whitespace is ok else raise "4malformed json for excel conversion! char: #{c.inspect} position: #{pos}" end end # scan for staring value while true c = fromFile.read(1);pos += 1 if c == '"' # string follows value = "" value << c while true c = fromFile.read(1);pos += 1 value << c if c == '"' break end end c = fromFile.read(1);pos += 1 break elsif c == ' ' or c == '\n' or c == '\r' # whitespace is ok elsif "1234567890".include? c # number follows value = "" value << c while true c = fromFile.read(1);pos += 1 if "1234567890".include? c value << c else break end end break elsif c == "t" # true follows c = fromFile.read(3);pos += 3 if c != "rue" raise "excpected true but found t#{c.inspect} position: #{pos}" end value = "true" c = fromFile.read(1);pos += 1 break elsif c == "f" # false follows c = fromFile.read(4);pos += 4 if c != "alse" raise "excpected false but found f#{c.inspect} position: #{pos}" end value = "false" c = fromFile.read(1);pos += 1 break else raise "5malformed json for excel conversion! char: #{c.inspect} position: #{pos}" end end # value starts object[name] = value puts object end puts "c: #{c.inspect}" if c == "," # comma is ok! just take many of them, does not hurt. elsif c == ' ' or c == '\n' or c == '\r' # whitespace is ok elsif c == "}" # object ends! break else raise "3malformed json for excel conversion! char: #{c.inspect} position: #{pos}" end end attributes.each{|attr| value = object[attr] raise "expected object #{object} to have attribute #{attr} position: #{pos}" if value.nil? toFile.write(value) toFile.write(',') } toFile.write("\"\"\r\n") # this is the csv new line. a new object begins here elsif c == ' ' or c == '\n' or c == '\r' # whitespace is ok elsif c == ']' attributes.each{ |attr| toFile.write(attr.inspect) toFile.write(",") } toFile.write("\"\"\r\n") # this is the csv new line. a new object begins here # the end of the file c = fromFile.read() if c != '' raise "end of listing was reached. skipping #{c.size} character after position #{pos}: #{c.inspect}" end break elsif c == ',' # comma is ok! just take many of them, does not hurt. else raise "2malformed json for excel conversion! char: #{c.inspect} position: #{pos}" end end break else raise "1malformed json for excel conversion! char: #{c.inspect} position: #{pos}" end end end json2excel(File.open('json.txt'), File.open('excel.csv', 'wb'))
json.txt
[{"id": 1,"pro_id": 3,"pro_name": "asdf","cli_id": 113,"cli_name": "tyuryt"} , {"id": 1,"pro_id": 3,"pro_name": "asdf","cli_id": 113,"cli_name": "tyuryt"}]
excel.csv
1,3,"asdf",113,"tyuryt","" 1,3,"asdf",113,"tyuryt","" "id","pro_id","pro_name","cli_id","cli_name",""
您的列名称位于文件的末尾。
如果在第一个对象之后引入新属性，则并非所有列都具有相同的元素数。
注意：它不会将所有内容加载到内存中，但会尽快将其写入文件。
它没有做什么：
- 负数
- 数字与
.在他们中 - 字符串中包含
"in。