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 应用程序将它导出到一个 Excel 表中,但是我的请求在服务器上被 PHP 应用程序超时。所以我想知道有没有优雅的方式来解决这个问题。我想出了2个解决方案。首先是进行批处理(需要阅读,因为我是新手),另一个是我的 php 应用程序将发送一个大的 json 对象,我的 ruby 应用程序将读取该 json 对象将数据写入 excel 表并发回excel表格。所以我想问是否有更好的方法来处理这个问题?以及如何将 json 转换为 excel 我做了谷歌并找到了 excel 到 json 但反之亦然。有什么建议么?
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我有一些时间,所以我在 ruby1.9 中构建了一个 json 到 excel csv 转换器:
它从一个文件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",""
您的列名在文件的末尾。
如果在第一个对象之后引入新属性,则并非所有列的元素计数都相同。
注意:它不会将所有内容加载到内存中,而是尽快将其写入文件。
它不做什么:
- 负数
- 带有 a
.
的数字 - 里面有字符串
"
。
于 2013-06-21T10:24:44.627 回答