CSV-Text File

Create a text file and fill in with the passed content

Syntax

var outcome = utils.createTextFile(String fileName, String fileContent, Boolean overwrite, Long directoryId);

Details

Argument	Description
	fileName -file name; it can includes a subpath to append to the base path specified through directoryId
fileContent	text content to save
overwrite	true to overwrite the file content if already exists, falseto ignore this operation and returns false as result
directoryId	directory identifier, used to define the absolute path, in the central server, where the file will be stored; if null, there must be one only entry for this application
outcome	true in case of the operation has beenexecuted successfully, an exception otherwise

Create a text file with specify charset and fill in with the passed content

Syntax

var outcome = utils.createTextFile(String fileName, String fileContent, 
    Boolean overwrite, Long directoryId, String charsetName
);

Details

Argument	Description
	fileName -file name; it can includes a subpath to append to the base path specified through directoryId
fileContent	text content to save
overwrite	true to overwrite the file content if already exists, falseto ignore this operation and returns false as result
directoryId	directory identifier, used to define the absolute path, in the central server, where the file will be stored; if null, there must be one only entry for this application
outcome	true in case of the operation has beenexecuted successfully, an exception otherwise
charsetName	name charset

Writing a very long text file on the server file system

From 5.3.1 version

Write a very long text file on the server file system, through a 3 steps approach:

first, open the output stream, through the "opeTextFile" method
next, add as many rows as you need, by invoking the "writeTotextFile" method multiple times, for each row to add
finally, close the output stream, by invoking the "closeTextFile"

Data could be retrieved from a SQL query, through the executeQueryWithCallback method, since this will ensure a limited amount of memory consumption.

Syntax for openTextFile method

var fileId = utils.openTextFile(fileName, overwrite, directoryId, fileAppend);

var fileId = utils.openTextFile(fileName, overwrite, directoryId, fileAppend, charsetName);

Details

Argument

	Description
fileName	text file name to create within the specified directory
overwrite	flag true\|false used to define whether the file must overwrite a previous one
directoryId	directory identifier, used to define the absolute path, in the central server, where the file will be stored; if null, there must be one only entry for this application
fileAppend	flag true\|false used to define if rows to add must be appneded at the end of an already existing file
fileId	a text id, representing the output stream, to refer in the next two methods.
charsetName	name charset

Syntax for writeToTextFile method

var fileId = utils.writeToTextFile(fileId, row)

Details

Argument	Description
fileId	a text id, representing the output stream, needed to work qwith the correct output stream
row	a text to write; this text does NOT contain a return carriage, so it is up to the programmer to add it, if needed (e.g. "\r\n")

Syntax for closeTextFile method

Argument	Description
fileId	a text id, representing the output stream, needed to work qwith the correct output stream

Example

// open the text file, in order to write into it
var fileId = utils.openTextFile(
    "abc.txt",true,9, true
);

// declare a callback function, invoked by a SQL query, used to write a single line into the text file
var processRow = function(jsonRow) \{
    var row = jsonRow.userCodeId+","+jsonRow.description+"\r\n"; // or any other custom logic to use to produce a text content
    utils.writeToTextFile(fileId,row);
\}

// execute the SQL query, whose result set will be read row by row, by invoking each time the specified callback
utils.executeQueryWithCallback(
    "processRow", // callback function, invoked for each record coming from the query, whose argument will receive a JSON object representing the record
    "SELECT U.USER_CODE_ID,U.DESCRIPTION,U.PASSWORD,U.DATE_EXPIRATION_PASSWORD,U.ROW_VERSION FROM PRM01_USERS U",
    null,
    false,
    true,
    []
);

// close the text file, after reading all records from the query
utils.closeTextFile(fileId);

Read a text file located on the server

var textString = utils.readTextFile(filePath);

Important note: please do not use this method in case of a very long text file (e.g. > 10MB), since it can consume an excessive amount of memory on the server and reduce the scalability of your application. In case of very long files, use the method described below.

Details

Argument	Description
filePath	Filepath + Filename of the file to read
textString	The content of the read file

Read a text file located on the server with a specific charset

A text file can be saved with different charset formats. You have to know in advance which format to use. Examples of formats are: UTF-8 or Windows-1252

var textString = utils.readTextFile(filePath, charSet);

Details

Argument	Description
filePath	Filepath + Filename of the file to read
charSet	the charset to use when reading the text file
textString	The content of the read file

Read a very long text file

From 5.3.1 version

In case of a very long text file, it would be better to read it row by row, in order to limit the amount of data stored in the server.

The following method requires a callback function, which will be invoked automatically, for each line read from the file. The current line (string) will be passed forward to the callback method.

utils.readTextFile(String fileName,Long directoryId,String callbackFunName);

Details

Argument	Description
fileName	text file name to read
directoryId	directory id, identifying where the file is located; can work both with server file system and Google Cloud Storage
callbackFunName	callback function name, invoked by this one for each row

Read a very long text file with charset

From 5.3.1 version

In case of a very long text file, it would be better to read it row by row, in order to limit the amount of data stored in the server.

The following method requires a callback function, which will be invoked automatically, for each line read from the file. The current line (string) will be passed forward to the callback method.

utils.readTextFile(String fileName,Long directoryId,String callbackFunName,String charset);

Details

Argument	Description
filePath	text file name to read
directoryId	directory id, identifying where the file is located; can work both with server file system and Google Cloud Storage
callbackFunName	callback function name, invoked by this one for each row
charset	charset to use when reading file; e.g. UTF-8

Read a very long text file located on the server with charset

From 5.3.1 version

In case of a very long text file, it would be better to read it row by row, in order to limit the amount of data stored in the server.

The following method requires a callback function, which will be invoked automatically, for each line read from the file. The current line (string) will be passed forward to the callback method.

utils.readTextFile(String filePath,String callbackFunName,String charset);

Details

Argument	Description
filePath	absolute path on the server file system, including the file name to read
callbackFunName	callback function name, invoked by this one for each row
charset	charset to use when reading file; e.g. UTF-8

Delete a file previously stored in a specific path

Syntax

var outcome = utils.deleteFile(String fileName,Long directoryId);

Details

Argument	Description
fileName	it can includes a subpath to append to the base path specified through directoryId
directoryId	directory identifier, used to define the absolute path, in the central server, where the file will be stored; if null, there must be one only entry for this application
outcome	true in case of the operation has beenexecuted successfully, an exception otherwise

Read the specified URL and convert the HTML content to an image and save it to the server file system.

Syntax

utils.convertUrlToImage(String url, String imagePath);

Details

url: URL to read, related to HTML content 
imagePath: absolute path + image file name where saving the image 
fire an exception in case of errors.

Reading the HTML content and convert it to an image and save the image to the server file system.

Syntax

utils.convertHtmlToImage(String html, String imagePath);

Details

html: HTML content to read 
imagePath: absolute path + image file name where saving the image 
fire an exception in case of errors.

Reading a csv file stored in the specified path

Read up to the specified number of rows, starting from the specified index (0..x) from the csv file stored in the specified path and get back the content of a specific folder

dirId path identifier
fileName name of the csv file
attributeNames, list of attributes, assigned to each column, starting from leftmost column to the right

Syntax

var list = utils.getCsvContent(String sep,String dirId,String fileName,Integer startRow,Integer blockSize,Boolean removeEmptyValues,String... attributeNames);

Important note: this method should NOT be used in case of very long CSV files, since it can consume a large amount of memory on the server. In case of a very long CSV file, please refer the next method.

Details

 sep tokens separator: ; or ,
 dirId: path identifier; optional and helpful for files stored in the cloud; you can set it to null, to save temporarelly the uploaded file in the tmp dir of the application server
 fileName: name of the csvfile

startRow row index; if null it is the first row, i.e. 0

blockSize max number of rows to read, if available; if null it is set to 10000

attributeNames, list of attributes, assigned to each column, starting from leftmost column to the right

 return a list of js objects, where each object is expressed as a set of couples <attributename, related value>

A list of js objects, where each object is expressed as a set of couples <attributename, related value>; a 0 length list in case of no more rows available.
It supports also nested objects and list of objects: it depends on the definition of the attribute lists.
A few examples of attributes:
[ "attr1", "subobject.attrsub1", "subobject.attrsub2", "sublist[0].subattr3","sublist[0].subattr4","sublist[1].subattr5" ]

Reading a very long csv file stored in the specified path

From 5.3.2 version

In case of very long CSV files to read (e.g. > 1MB), it would be better to avoid reading the whole content and maintain it in the server memory, until the end of its processing: this could lead to an excessive amount of memory consumption.

The best approach consists of reading that file row by row and maintain in memory only one row per time. The following method allows to do it: a callback function is used to process a single row and it is invoked automatically when reading the CSV file.

Syntax

utils.readCSVFile(
  fileName,
  directoryId,
  sep,
  skipFirstRow,
  callbackFunName,
  attributeNames
);

Details

Argument	Description
filenName	CSV file name to read from the specified directory
directoryId	directory identifier, used to define the absolute path, in the central server, where the file is already located
sep	field separator; allowed values: , or ;
skipFirstRowflag	true\|false, indicating whether the first row in the file should me skipped, for instance because it contains the column header names.
callbackFunName	callback function name which will be invoked for each row read from the CSV file. Such a function must be declared before the invocation of this one, and must include and argument used to pass forward the js object representing data read for theCS
attributeNames	will be created and filled with the values coming from the fields, each with the specified attribute name

Example

var processRow = function(row) \{
    utils.log(
        row.userCodeId+"-"+row.password+"-"+row.rowVersion+"-"+row.dateExpirationPassword,
        "INFO"
    );
\}

utils.readCSVFile(
    "myfile.csv", // file name
    9, // data source id
    ",", // separator
    false, 
    "processRow", // callback function name
    ["userCodeId","password","rowVersion","dateExpirationPassword"]
);

Reading a very long csv file stored in the specified path and write it directly to a database table

From 5.3.2 version

The best approach consists of reading that file row by row and maintain in memory only one row per time. The following method allows to do it; moreover, this method is optimized in case you need to load data into a database table.

This methods allows to read part of data from the CSV file and part from default values. You can also read only a part of the columns provided in the CSV file.

Syntax

var processedRows = utils.readCSVFileAndWriteToTable( 
  fileName,
  directoryId,
  sep,
  skipFirstRow,
  datastoreId,
  tableName,
  defaultFieldNames,
  csvFields
);

Details

Argument	Description
filenName	CSV file name to read from the specified directory
directoryId	directory identifier, used to define the absolute path, in the central server, where the file is already located; can be null
sep	field separator; allowed values: , or ;
skipFirstRowflag	true or false, indicating whether the first row in the file should me skipped, for instance because it contains the column header names.
datastoreId	data source id which identifies where the table to load is located
tableName	name of the table where data will be loaded
defaultFieldNames	javascript object containing the list of additional table fields to fill in, expressed as field name + value; example: { STATUS: "E", CREATE_DATE: new java.sql.Date() }
csvFields	list of javascript objects, one for each CSV column; the object structure can contains optionally these attributes: { fieldName: "....", convertToSqlDate: "yyyy-MM-dd", convertToSqlTimestamp: "yyyy-MM-dd HH:mm:ss" }. This object allows to define whether the CSV column must be used to fill in the corresponding table field specified through "fieldName" attribute; if this attribute is omitted, the CSV column is ignored when importing the row; the other two attributes (convertXXXX) are optional and must be used in case a CSV column must be mapped to a DATE or DATETIME table field. Another property is trim: true

Example

var processedRows = utils.readCSVFileAndWriteToTable(
    "myproducts.csv", // file name
    9, // data source id
    ",", // separator
    false, 
    null, // data source id: default database schema
    "MY_TABLE", // table name where inserting data
    \{ // these are the default values to include in every INSERT
       STATUS: "E", 
       CREATE_DATE: new java.sql.Timestamp(),
       USER_ID_CREATE: userInfo.username,
       ROW_VERSION: 1
    \},
    [ // this is the list of CSV columns
    \{ fieldName: "PRODUCT_CODE" \},
    \{\}, // second CSV column ignored, since it does not contain the "fieldName" attribute
    \{ fieldName: "DESCRIPTION" \},
    \{ fieldName: "START_DATE", convertToSqlDate: "yyyy-MM-dd" \}, // we suppose that this column contains a date expressed in such format
    \{ fieldName: "ID", progressive: "INTERNAL_UUID" \}
    ]
);

Writing a csv file on the server file system

Write a CSV file on the server file system, starting from a list of data provided in input.

Data could be retrieved from a SQL query, through the executeQuery method.

Syntax

var outcome = utils.createCSVFile(
  fileName,
  overwrite,
  directoryId, 
  data, 
  sep,
  languageId,
  exportAttributes,
  exportColumns,
  formatColumns,
  printTitles,
  fileAppend
);

Details

Argument	Description
filenName	CSV file name to create within the specified directory
directoryId	directory identifier, used to define the absolute path, in the central server, where the file will be stored; if null, there must be one only entry for this application
data	list of js objects, one for each row to save into the CSV file
sep	field separator; allowed values: , or ;
languageId	IT, EN, ...
exportAttributes	list of attribute names to export into the CSV file
exportColums	list of column headers to include as the first row in the CSV file
formatColumns	optional list of formatters to apply to the data defined in each js object, in order to convert data to text (e.g. "0.00" to covnert a number to string)
printTitles	flag true\|false, indicating whether the column headers must be included as the first row in the CSV file
outcome	"" in case of the operation has been executed successfully, the error message otherwise

Writing a very long csv file on the server file system

From 5.3.2 version

Write a very long CSV file on the server file system, through a 3 steps approach:

first, open the output stream, through the "openCSVFile" method
next, add as many rows as you need, by invoking the "writeToCSVFile" method multiple times, for each row to add
finally, close the output stream, by invoking the "closeCSVFile"

Data could be retrieved from a SQL query, through the executeQueryWithCallback method, since this will ensure a limited amount of memory consumption.

Syntax for openCSVFile method

var fileId = utils.openCSVFile(fileName, overwrite, directoryId, sep, fileAppend, attributesToWrite, formatters)

Details

Argument	Description
fileName	CSV file name to create within the specified directory
overwrite	flag true\|false used to define whether the file must overwrite a previous one
directoryId	directory identifier, used to define the absolute path, in the central server, where the file will be stored; if null, there must be one only entry for this application
sep	field separator; allowed values: , or ;
fileAppend	flag true\|false used to define if rows to add must be appneded at the end of an already existing file
attributesToWrite	list of attribute names to export into the CSV file
formatters	optional list of formatters to apply to the data defined in each js object, in order to convert data to text (e.g. "0.00" to covnert a number to string)
fileId	a text id, representing the output stream, to refer in the next two methods.

Syntax for writeToCSVFile method

var fileId = utils.writeToCSVFile(fileId, obj)

Details

Argument	Description
fileId	a text id, representing the output stream, needed to work qwith the correct output stream
obj	javascript object, containing data to write as a row in the CSV file; data contains attributes referred in the previous method through "attributrstoWrite" argument

Syntax for closeCSVFile method

var fileId = utils.closeCSVFile(fileId)

Details

Argument	Description
fileId	a text id, representing the output stream, needed to work qwith the correct output stream

Example

// open the CSV file, in order to write into it
var fileId = utils.openCSVFile(
    "ab.csv",true,9, ",",true,
    ["userCodeId","password","rowVersion","dateExpirationPassword"],
    [null,null,null,null]
);

// declare a callback function, invoked by a SQL query, used to write a single line into the CSV file
var processRow = function(jsonRow) \{
    utils.writeToCSVFile(fileId,jsonRow);
\}

// execute the SQL query, whose result set will be read row by row, by invoking each time the specified callback
utils.executeQueryWithCallback(
    "processRow", // callback function, invoked for each record coming from the query, whose argument will receive a JSON object representing the record
    "SELECT U.USER_CODE_ID,U.DESCRIPTION,U.PASSWORD,U.DATE_EXPIRATION_PASSWORD,U.ROW_VERSION FROM PRM01_USERS U",
    null,
    false,
    true,
    []
);

// close the CSV file, after reading all records from the query
utils.closeCSVFile(fileId);

Writing a very long csv file on the server file system from a SQL query

From 5.3.2 version

Write a very long CSV file on the server file system, starting from a SQL query.

var errorMsg = utils.createCSVFileFromSQLQuery(
   fileName, overwrite, directoryId, sep, languageId, printTitles, fileAppend, formatColumns,
   datasourceId,
   sqlQuery,
   pars
);

Details

Argument	Description
fileName	CSV file name to create within the specified directory
overwrite	flag true/false used to define whether the file must overwrite a previous one
directoryId	directory identifier, used to define the absolute path, in the central server, where the file will be stored; if null, there must be one only entry for this application
sep	field separator; allowed values: , or ;
languageId	language to use when formatting date values
printTitles	flag true/false used to incude a first row within the CSV file related to the SELECT field names
fileAppend	flag true/false used to define if rows to add must be appneded at the end of an already existing file
formatColumns	optional list of formatters to apply to the data defined in each js object, in order to convert data to text (e.g. "0.00" to covnert a number to string)
datasourceId	datasource id which identifies the database schema where reading data
sqlQuery	SQL query to execute, in order to fill in the CSV file
pars	list of javascript values, related to binding variables expressed as ?

Example

var errors = utils.createCSVFileFromSQLQuery(
   "mycsffile.csv", 
   false, // overwrite, 
   xyz, // directoryId where the file csv will be created
   ";", // separator to use among the CSV fields
   "IT", // languageId
   true, // printTitles
   false, //  fileAppend
   null, // formatColumns
   datasourceId,
   "SELECT FIELD1,FIELD2,FIELD3 FROM MYTABLE WHERE FIELDX=?",
   ["VALUEFORFIELDX"]
);

Writing data to CloudSQL from a CSV file stored in Google Cloud Storage

From 5.3.2 version

Starting from a CSV file stored in Google Cloud Storage, this method allows to load the whole content to a CloudSQL instance, in the specified table/schema, always in append mode.

In order to use this function, a Google cloud administrator must set the correct grants to the GCS and CloudSQL services.

utils.importDataInCloudSQL(instance, bucketPath, dbSchema, dataSourceId, tableName, where, timeout, columns);

Details

Argument	Description
instance	CloudSQL instance name; this value is reported within the Google Cloud Console
bucketPath	GCS bucket name + subpath + file name for the CSV, expressed as gs://bucketname/filename.csv
dbSchema	database schema where the table to load is located
dataSourceId	datasource id related to the schema specified with the previous argument
tableName	table where saving data coming from the CSV file
where	can be null; optional WHERE condition to include in the SQL query automatically executed (every 2 seconds) in order to check out if the data to import has been loaded. In null, it is assumed that the table is empty and the executed query would be "SELECT COUNT() FROM tablename". This method terminates when the returned value is > 0. If this argument is filled in, the query would be "SELECT COUNT() from tablename WHERE yourwhere". Again, the method terminates when there is at least one record
timeout	max number of seconds to wait before a timeout is fired, waiting from the completition of data loading on the table
columns	list of table fields where the CSV data will be saved: these fields must be as many as the number of columns in the CSV file

Example

var processedRows = utils.importDataInCloudSQL(
    "cloudsqlinstancename",
    "gs://mybucket/myfile.csv",
    "mydatabaseschema",
    mydatasourceid,
    "mytable",
    "MYFIELD = 'XYZ' ",
    50,// max number of seconds to wait
    ["STATISTICS","VALUE","POSITION","DDS","TOTALE","PERCENTUALE"] // table field names/CSV columns
);
utils.debug("Processed Rows: " + processedRows);

var response = utils.importDataInCloudSQL(
    "cloudsqlinstancename",
    "gs://mybucket/myfile.csv",
    "mydatabaseschema",
    mydatasourceid,
    "mytable",
    "MYFIELD = 'XYZ' ",
    50,// max number of seconds to wait
    ["STATISTICS","VALUE","POSITION","DDS","TOTALE","PERCENTUALE"] // table field names/CSV columns
);
utils.debug("Processed Id: " + response.name);
utils.debug("Rows: " + response.processedRows);
utils.debug("Status: " + response.status);
utils.debug("Start: " + response.startTime);
utils.debug("End: " + response.endTime);
utils.debug("Operation Type: " + response.operationType)

Getting the charset for a text type file

From 6.0.2 version

Starting from text type file stored in the server file system, it returns the file charset.

Syntax

 var string = utils.getTxtFileCharset(String fileName)

The return value can be any of the following:

Chinese
- ISO-2022-CN
- BIG-5
- EUC-TW
- HZ-GB-2312
- GB-18030
Cyrillic
- ISO-8859-5
- KOI8-R
- WINDOWS-1251
- MACCYRILLIC
- IBM866
- IBM855
Greek
- ISO-8859-7
- WINDOWS-1253
Hebrew
- ISO-8859-8
- WINDOWS-1255
Japanese
- ISO-2022-JP
- Shift_JIS
- EUC-JP
Korean
- ISO-2022-KR
- EUC-KR
Unicode
- UTF-8
- UTF-16BE / UTF-16LE
- UTF-32BE / UTF-32LE / X-ISO-10646-UCS-4-3412 / X-ISO-10646-UCS-4-2143
Others
- WINDOWS-1252
- US-ASCII

Create a text file and fill in with the passed content ​

Create a text file with specify charset and fill in with the passed content ​

Writing a very long text file on the server file system ​

Read a text file located on the server ​

Read a text file located on the server with a specific charset​

Read a very long text file​

Read a very long text file with charset​

Read a very long text file located on the server with charset​

Delete a file previously stored in a specific path ​

Read the specified URL and convert the HTML content to an image and save it to the server file system.​

Reading the HTML content and convert it to an image and save the image to the server file system.​

Reading a csv file stored in the specified path ​

Reading a very long csv file stored in the specified path ​

Reading a very long csv file stored in the specified path and write it directly to a database table ​

Writing a csv file on the server file system ​

Writing a very long csv file on the server file system ​

Writing a very long csv file on the server file system from a SQL query ​

Writing data to CloudSQL from a CSV file stored in Google Cloud Storage ​

Getting the charset for a text type file ​

Create a text file and fill in with the passed content

Create a text file with specify charset and fill in with the passed content

Writing a very long text file on the server file system

Read a text file located on the server

Read a text file located on the server with a specific charset

Read a very long text file

Read a very long text file with charset

Read a very long text file located on the server with charset

Delete a file previously stored in a specific path

Read the specified URL and convert the HTML content to an image and save it to the server file system.

Reading the HTML content and convert it to an image and save the image to the server file system.

Reading a csv file stored in the specified path

Reading a very long csv file stored in the specified path

Reading a very long csv file stored in the specified path and write it directly to a database table

Writing a csv file on the server file system

Writing a very long csv file on the server file system

Writing a very long csv file on the server file system from a SQL query

Writing data to CloudSQL from a CSV file stored in Google Cloud Storage

Getting the charset for a text type file