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csv.go
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csv.go
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package main
import (
"encoding/csv"
"errors"
"fmt"
"io"
"os"
"strings"
"unicode/utf8"
)
func containsDelimiter(col string) bool {
return strings.Contains(col, ";") || strings.Contains(col, ",") ||
strings.Contains(col, "|") || strings.Contains(col, "\t") ||
strings.Contains(col, "^") || strings.Contains(col, "~")
}
// Parse columns from first header row or from flags
func parseColumns(reader *csv.Reader, skipHeader bool, fields string) ([]string, error) {
var err error
var columns []string
if fields != "" {
columns = strings.Split(fields, ",")
if skipHeader {
reader.Read() //Force consume one row
}
} else {
columns, err = reader.Read()
if err != nil {
return nil, err
}
}
for _, col := range columns {
if containsDelimiter(col) {
return columns, errors.New("delimiter in header column detected: " + col)
}
}
for i, col := range columns {
columns[i] = postgresify(col)
}
return columns, nil
}
func copyCSVRows(i *Import, reader *csv.Reader, ignoreErrors bool, delimiter string, columns []string) (error, int, int) {
success := 0
failed := 0
for {
cols := make([]interface{}, len(columns))
record, err := reader.Read()
if err == io.EOF {
break
}
if err != nil {
line := strings.Join(record, delimiter)
failed++
if ignoreErrors {
os.Stderr.WriteString(string(line))
continue
} else {
err = errors.New(fmt.Sprintf("%s: %s", err, line))
return err, success, failed
}
}
//Loop ensures we don't insert too many values and that
//values are properly converted into empty interfaces
for i, col := range record {
cols[i] = col
}
err = i.AddRow(cols...)
if err != nil {
line := strings.Join(record, delimiter)
failed++
if ignoreErrors {
os.Stderr.WriteString(string(line))
continue
} else {
err = errors.New(fmt.Sprintf("%s: %s", err, line))
return err, success, failed
}
}
success++
}
return nil, success, failed
}
func importCSV(filename string, connStr string, schema string, tableName string, ignoreErrors bool, skipHeader bool, fields string, delimiter string) error {
file, err := os.Open(filename)
if err != nil {
return err
}
defer file.Close()
db, err := connect(connStr, schema)
if err != nil {
return err
}
defer db.Close()
bar := NewProgressBar(file)
reader := csv.NewReader(io.TeeReader(file, bar))
reader.Comma, _ = utf8.DecodeRuneInString(delimiter)
reader.LazyQuotes = true
columns, err := parseColumns(reader, skipHeader, fields)
if err != nil {
return err
}
reader.FieldsPerRecord = len(columns)
i, err := NewCSVImport(db, schema, tableName, columns)
if err != nil {
return err
}
bar.Start()
err, success, failed := copyCSVRows(i, reader, ignoreErrors, delimiter, columns)
bar.Finish()
if err != nil {
lineNumber := success + failed
if !skipHeader {
lineNumber++
}
return errors.New(fmt.Sprintf("line %d: %s", lineNumber, err))
} else {
fmt.Println(fmt.Sprintf("%d rows imported into %s.%s", success, schema, tableName))
if ignoreErrors && failed > 0 {
fmt.Println(fmt.Sprintf("%d rows could not be imported into %s.%s and have been written to stderr.", failed, schema, tableName))
}
return i.Commit()
}
}