csv,groovy , Refer to column headings csv Groovy


Refer to column headings csv Groovy

Question:

Tag: csv,groovy

I'm trying to figure out if there's a way of accessing column headings in a CSV using OpenCSV in groovy? This is what I have:

@GrabConfig( systemClassLoader=true )
@Grab( 'mysql:mysql-connector-java:5.1.27' )
@Grab(group = 'net.sf.opencsv', module = 'opencsv', version = '2.3')
import groovy.sql.Sql
import au.com.bytecode.opencsv.CSVReader
import au.com.bytecode.opencsv.CSVParser
def sql = Sql.newInstance("jdbc:mysql://localhost:3306/nid", "developer","whatever", "com.mysql.jdbc.Driver")
def notes = sql.dataSet("vdc_notifications")
def TEST_FILE_NAME = 'C:\\Users\\me\\Desktop\\test.csv'

List<String[]> rows = new CSVReader(new FileReader(new File(TEST_FILE_NAME)), CSVParser.DEFAULT_SEPARATOR, CSVParser.DEFAULT_ESCAPE_CHARACTER, CSVParser.DEFAULT_QUOTE_CHARACTER).readAll()

What i'm trying to get to is being able to do:

rows.each() { row -> println row.some_column_name }

Answer:

usually the first row of a CSV file contains the names of the columns. so you can either use a simple parsing approach and take the first row for the header:

@Grab('net.sf.opencsv:opencsv:2.3')
import au.com.bytecode.opencsv.CSVReader
import au.com.bytecode.opencsv.bean.CsvToBean;
import au.com.bytecode.opencsv.bean.HeaderColumnNameMappingStrategy;

def csv = """\
name,age
Charlie,23
Billy,64"""

// read the files and keep the first one as the header
def csvr = new CSVReader(new StringReader(csv))
def header
while ((line=csvr.readNext())) {
    if (!header) {
        header = line
    } else {
        // create a map from the header and the line
        println([header,line].transpose().collectEntries())
    }
}

Or you can use the CsvToBean and the HeaderColumnNameMappingStrategy to create beans:

class Person {
    String name
    Integer age
}

// use the mapper
def ctb = new CsvToBean<Person>()
def hcnms = new HeaderColumnNameMappingStrategy<Person>()
hcnms.type = Person
println ctb.parse(hcnms, new StringReader(csv))

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