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main.go
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main.go
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package main
import (
"fmt"
"log"
"os"
"github.com/c4rnot/csv_to_gorm"
"gorm.io/driver/postgres"
"gorm.io/gorm"
)
type Apple struct {
gorm.Model // include ID, CretedAt, UpdatedAt, DeletedAt
Name string
Diameter float64
Popularity float64
Origin string
Discovered uint
ForCooking bool
ForEating bool
}
var (
colMap = map[string]int{
"Name": 1,
"Diameter": 2,
"Popularity": 3,
"Origin": 4,
"Discovered": 5,
"ForCooking": 6,
"ForEating": 7,
}
applesFileName = "apples.csv"
orangesFileName = "oranges.csv"
yieldFileName = "yield.csv"
lossesFileName = "pest_losses.csv"
exportersFileName = "biggest_exporters.csv"
)
type Orange struct {
gorm.Model // include ID, CretedAt, UpdatedAt, DeletedAt
Name string `xtg:"col:Name"`
Diameter float64 `xtg:"col:diameter"`
Popularity float64 `xtg:"col:Liked By"`
}
type Yield struct {
gorm.Model // include ID, CretedAt, UpdatedAt, DeletedAt
Name string `xtg:"col:Name"`
Product string `xtg:"mapConst:product"`
Year int `xtg:"intcols:colname"`
Yield float64 `xtg:"intcols:value"`
}
type PestLoss struct {
gorm.Model // include ID, CretedAt, UpdatedAt, DeletedAt
Name string `xtg:"col:Name"`
Cause string `xtg:"melt:colname"`
Loss float64 `xtg:"melt:value"`
}
type BiggestExporter struct {
gorm.Model // include ID, CretedAt, UpdatedAt, DeletedAt
Country string `xtg:"col:country"`
Type string `xtg:"melt:colname"`
ExportCode int `xtg:"melt:value"`
Year int `xtg:"intcols:colname"`
BiggestExporter string `xtg:"intcols:value"`
}
func main() {
// open the file to read and defer its closure
applesFile, err := os.Open(applesFileName)
if err != nil {
log.Fatal(err)
}
defer applesFile.Close()
// connect to the DB
dsn := os.Getenv("DATABASE_URL")
db, err := gorm.Open(postgres.Open(dsn), &gorm.Config{
CreateBatchSize: 1000,
})
if err != nil {
log.Fatal("failed to connect database ", err)
}
// Ensure the expected schema is applied to the database
err = db.AutoMigrate(&Apple{})
if err != nil {
log.Fatal("could not migrate schema ", err)
}
db.AutoMigrate(&Orange{})
db.AutoMigrate(&Yield{})
db.AutoMigrate(&PestLoss{})
db.AutoMigrate(&BiggestExporter{})
params := csv_to_gorm.Params{
ColMap: colMap,
FirstRowHasData: false,
}
// ** Guess separator example
// *******************************
sep, err := csv_to_gorm.GuessSeparator(applesFile)
if err != nil {
fmt.Println("Error guessing Separator", err.Error())
}
fmt.Println("Separator guessed to be: ", string(sep))
// ** Get headings example
// *******************************
headings, err := csv_to_gorm.GetHeadings(applesFile, sep)
if err != nil {
fmt.Println("Errorgetting headings", err.Error())
}
fmt.Println("CSV file column headings are: : ", headings)
// ** Get Database fields example
// *******************************
dbFields, err := csv_to_gorm.GetDbFields(&Apple{})
if err != nil {
fmt.Println("Errorgetting headings", err.Error())
}
fmt.Println("Database Fields are: : ", dbFields)
// ** Read csv to database example
// *******************************
// note, you need to typecast the returned interface so that Gorm knows what it is
apples, err := csv_to_gorm.CsvToSlice(applesFile, sep, &Apple{}, params)
apples = apples.([]Apple)
if err != nil {
fmt.Println("Error creating Apples", err)
}
fmt.Println("apples", apples)
db.Model(&Apple{}).Create(apples) // PASS
params = csv_to_gorm.Params{
FirstRowHasData: false,
}
orangesFile, err := os.Open(orangesFileName)
if err != nil {
log.Fatal(err)
}
defer orangesFile.Close()
oranges, err := csv_to_gorm.CsvToSlice(orangesFile, sep, &Orange{}, params)
oranges = oranges.([]Orange)
if err != nil {
fmt.Println("Error creating Oranges", err)
}
db.Model(&Orange{}).Create(oranges) // PASS
params = csv_to_gorm.Params{
FirstRowHasData: false,
ConstMap: map[string]string{"product": "apple"},
}
yieldFile, err := os.Open(yieldFileName)
if err != nil {
log.Fatal(err)
}
defer yieldFile.Close()
yields, err := csv_to_gorm.CsvToSlice(yieldFile, sep, &Yield{}, params)
yields = yields.([]Yield)
if err != nil {
fmt.Println("Error creating yields", err)
}
db.Model(&Yield{}).Create(yields) // PASS
params = csv_to_gorm.Params{
FirstRowHasData: false,
}
lossesFile, err := os.Open(lossesFileName)
if err != nil {
log.Fatal(err)
}
defer lossesFile.Close()
pestLosses, err := csv_to_gorm.CsvToSlice(lossesFile, sep, &PestLoss{}, params)
pestLosses = pestLosses.([]PestLoss)
if err != nil {
fmt.Println("Error creating pest_loses", err)
}
db.Model(&PestLoss{}).Create(pestLosses) // PASS
params = csv_to_gorm.Params{
FirstRowHasData: false,
}
exportersFile, err := os.Open(exportersFileName)
if err != nil {
log.Fatal(err)
}
defer exportersFile.Close()
biggestExporters, err := csv_to_gorm.CsvToSlice(exportersFile, sep, &BiggestExporter{}, params)
biggestExporters = biggestExporters.([]BiggestExporter)
if err != nil {
fmt.Println("Error creating exporters", err)
}
db.Model(&BiggestExporter{}).Create(biggestExporters) // PASS
// ** Excel col helpers example **
// *******************************
colID := "ABC"
colNo, err := csv_to_gorm.ExcelColIdToColNo(colID)
if err != nil {
fmt.Println(err.Error())
}
fmt.Println("Excel column "+colID, "equates to column number ", colNo)
colID, _ = csv_to_gorm.ExcelColNoToColId(colNo)
if err != nil {
fmt.Println(err.Error())
}
fmt.Println("Excel column number ", colNo, "equates to column ", colID)
}