Constants The encoding used by all converters. This Hash holds the built-in converters of that can be accessed by name. You can select with or through the options Hash passed to.:integer Converts any field Integer accepts.:float Converts any field Float accepts.:numeric A combination of:integer and:float.:date Converts any field Date::parse accepts.:datetime Converts any field DateTime::parse accepts.:all All built-in converters. A combination of:datetime and:numeric. All built-in converters transcode field data to UTF-8 before attempting a conversion.

• Java Load Csv File

If your data cannot be transcoded to UTF-8 the conversion will fail and the field will remain unchanged. This Hash is intentionally left unfrozen and users should feel free to add values to it that can be accessed by all objects.

Short Ruby on Rails screencasts containing tips, tricks and tutorials. Great for both novice and experienced web developers. A Guide to the Ruby CSV Library, Part I. Related Topics: News. You don’t want to import a file with 300,000 lines all at once on a computer with 512MB RAM and.

Short Ruby on Rails. Allow users to import records into the database by uploading a CSV or Excel document. Here I show how to use Roo to parse these files and.

To add a combo field, the value should be an of names. Combo fields can be nested with other combo fields. The options used when no overrides are given by calling code. They are::colsep ',':rowsep:auto:quotechar ':fieldsizelimit nil:converters nil:unconvertedfields nil:headers false:returnheaders false:headerconverters nil:skipblanks false:forcequotes false A Regexp used to find and convert some common Date formats. A Regexp used to find and convert some common DateTime formats. A Struct contains details about a field’s position in the data source it was read from.

Will pass this Struct to some blocks that make decisions based on field structure. See CSV.convertfields for an example. Index The zero-based index of the field in its row. Line The line of the data source this row is from.

Header The header for the column, when available. This Hash holds the built-in header converters of that can be accessed by name. You can select with or through the options Hash passed to.:downcase Calls downcase on the header.:symbol The header is downcased, spaces are replaced with underscores, non-word characters are dropped, and finally tosym is called.

All built-in header converters transcode header data to UTF-8 before attempting a conversion. If your data cannot be transcoded to UTF-8 the conversion will fail and the header will remain unchanged. This Hash is intetionally left unfrozen and users should feel free to add values to it that can be accessed by all objects. To add a combo field, the value should be an of names. Combo fields can be nested with other combo fields. The version of the installed library. This method allows you to serialize an of Ruby objects to a or File of data.

This is not as powerful as Marshal or YAML, but perhaps useful for spreadsheet and database interaction. Out of the box, this method is intended to work with simple data objects or Structs. It will serialize a list of instance variables and/or Struct.members. If you need need more complicated serialization, you can control the process by adding methods to the class to be serialized. A class method csvmeta is responsible for returning the first row of the document (as an ). This row is considered to be a Hash of the form key1,value1,key2,value2, expects to find a class key with a value of the stringified class name and will create this, if you do not define this method.

This method is only called on the first object of the. The next method you can provide is an instance method called csvheaders. This method is expected to return the second line of the document (again as an ), which is to be used to give each column a header. By default, will set an instance variable if the field header starts with an @ character or call send passing the header as the method name and the field value as an argument.

Java Load Csv File

This method is only called on the first object of the. Finally, you can provide an instance method called csvdump, which will be passed the headers.

This should return an of fields that can be serialized for this object. This method is called once for every object in the. The io parameter can be used to serialize to a File, and options can be anything accepts.

This method is a convenience for building Unix-like filters for data. Each row is yielded to the provided block which can alter it as needed. After the block returns, the row is appended to output altered or not. The input and output arguments can be anything accepts (generally or IO objects).

If not given, they default to ARGF and $stdout. The options parameter is also filtered down to after some clever key parsing. Any key beginning with:in or:input will have that leading identifier stripped and will only be used in the options Hash for the input object. Keys starting with:out or:output affect only output. All other keys are assigned to both objects. The:outputrowsep option defaults to $INPUTRECORDSEPARATOR ( $/). This method is intended as the primary interface for reading files.

You pass a path and any options you wish to set for the read. Each row of file will be passed to the provided block in turn.

The options parameter can be anything understands. This method also understands an additional:encoding parameter that you can use to specify the Encoding of the data in the file to be read. You must provide this unless your data is in Encoding::defaultexternal. Will use this to determine how to parse the data. You may provide a second Encoding to have the data transcoded as it is read.

For example, encoding: 'UTF-32BE:UTF-8' would read UTF-32BE data from the file but transcode it to UTF-8 before parses it. This method wraps a you provide, or an empty default, in a object which is passed to the provided block. You can use the block to append rows to the and when the block exits, the final will be returned. Note that a passed is modfied by this method. Call dup before passing if you need a new. The options parameter can be anything understands. This method understands an additional:encoding parameter when not passed a to set the base Encoding for the output.

Needs this hint if you plan to output non-ASCII compatible data. # File csv.rb, line 1105 def self. Load( ioorstr, options = Hash. New) csv = new( ioorstr, options) # load meta information meta = Hash. csv. Shift cls = meta 'class'. Inject( Object) do c, const c.

Constget( const) end # load headers headers = csv. Shift # unserialize each object stored in the file results = csv.

Inject( Array. New) do all, row begin obj = cls. Csvload( meta, headers, row) rescue NoMethodError obj = cls. Allocate headers.

Zip( row) do name, value if name 0 ?@ obj. Instancevariableset( name, value) else obj. Send( name, value) end end end all. This constructor will wrap either a or IO object passed in data for reading and/or writing. In addition to the instance methods, several IO methods are delegated.

(See for a complete list.) If you pass a for data, you can later retrieve it (after writing to it, for example) with CSV.string. Note that a wrapped will be positioned at at the beginning (for reading).

If you want it at the end (for writing), use. If you want any other positioning, pass a preset StringIO object instead. You may set any reading and/or writing preferences in the options Hash. Available options are::colsep The placed between each field. This will be transcoded into the data’s Encoding before parsing.:rowsep The appended to the end of each row. This can be set to the special:auto setting, which requests that automatically discover this from the data. Auto-discovery reads ahead in the data looking for the next ' r n', ' n', or ' r' sequence.

A sequence will be selected even if it occurs in a quoted field, assuming that you would have the same line endings there. If none of those sequences is found, data is ARGF, STDIN, STDOUT, or STDERR, or the stream is only available for output, the default $INPUTRECORDSEPARATOR ( $/) is used. Obviously, discovery takes a little time. Set manually if speed is important. Also note that IO objects should be opened in binary mode on Windows if this feature will be used as the line-ending translation can cause problems with resetting the document position to where it was before the read ahead. This will be transcoded into the data’s Encoding before parsing.:quotechar The character used to quote fields.

This has to be a single character. This is useful for application that incorrectly use ' as the quote character instead of the correct '. Will always consider a double sequence this character to be an escaped quote. This will be transcoded into the data’s Encoding before parsing.:fieldsizelimit This is a maximum size will read ahead looking for the closing quote for a field.

(In truth, it reads to the first line ending beyond this size.) If a quote cannot be found within the limit will raise a, assuming the data is faulty. You can use this limit to prevent what are effectively DoS attacks on the parser. However, this limit can cause a legitimate parse to fail and thus is set to nil, or off, by default.:converters An of names from the Hash and/or lambdas that handle custom conversion. A single converter doesn’t have to be in an.

All built-in converters try to transcode fields to UTF-8 before converting. The conversion will fail if the data cannot be transcoded, leaving the field unchanged.:unconvertedfields If set to true, an unconvertedfields method will be added to all returned rows (Array or ) that will return the fields as they were before conversion. Note that:headers supplied by or were not fields of the document and thus will have an empty attached.:headers If set to:firstrow or true, the initial row of the file will be treated as a row of headers.

If set to an, the contents will be used as the headers. If set to a, the is run through a call of with the same:colsep,:rowsep, and:quotechar as this instance to produce an of headers. Free airsoft guns.

This setting causes to return rows as objects instead of Arrays and to return objects instead of an of Arrays.:returnheaders When false, header rows are silently swallowed. If set to true, header rows are returned in a object with identical headers and fields (save that the fields do not go through the converters).:writeheaders When true and:headers is set, a header row will be added to the output.:headerconverters Identical in functionality to:converters save that the conversions are only made to header rows.

All built-in converters try to transcode headers to UTF-8 before converting. The conversion will fail if the data cannot be transcoded, leaving the header unchanged.:skipblanks When set to a true value, will skip over any rows with no content.:forcequotes When set to a true value, will quote all fields it creates. See CSV::DEFAULTOPTIONS for the default settings. Options cannot be overridden in the instance methods for performance reasons, so be sure to set what you want here. This method opens an IO object, and wraps that with. This is intended as the primary interface for writing a file.

You must pass a filename and may optionally add a mode for Ruby’s open. You may also pass an optional Hash containing any options understands as the final argument. This method works like Ruby’s open call, in that it will pass a object to a provided block and close it when the block terminates, or it will return the object when no block is provided. ( Note: This is different from the Ruby 1.8 library which passed rows to the block. Use for that behavior.) You must provide a mode with an embedded Encoding designator unless your data is in Encoding::defaultexternal. Will check the Encoding of the underlying IO object (set by the mode you pass) to determine how to parse the data.

You may provide a second Encoding to have the data transcoded as it is read just as you can with a normal call to IO::open. For example, 'rb:UTF-32BE:UTF-8' would read UTF-32BE data from the file but transcode it to UTF-8 before parses it. An opened object will delegate to many IO methods for convenience. You may call:. binmode.

binmode?. close. closeread. closewrite. closed?. eof.

eof?. externalencoding. fcntl. fileno. flock.

flush. fsync. internalencoding. ioctl. isatty. path.

pid. pos. pos=. reopen.

seek. stat. sync.

sync=. tell.

toi. toio. truncate. tty?. Use to slurp a file into an of Arrays.

Pass the path to the file and any options understands. This method also understands an additional:encoding parameter that you can use to specify the Encoding of the data in the file to be read.

You must provide this unless your data is in Encoding::defaultexternal. Will use this to determine how to parse the data. You may provide a second Encoding to have the data transcoded as it is read. For example, encoding: 'UTF-32BE:UTF-8' would read UTF-32BE data from the file but transcode it to UTF-8 before parses it.