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package csv |
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import ( |
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"adrianolaselva.github.io/csvql/pkg/exportdata" |
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"database/sql" |
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"encoding/csv" |
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"fmt" |
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"github.com/schollz/progressbar/v3" |
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"os" |
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"path/filepath" |
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) |
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const ( |
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fileModeDefault os.FileMode = 0644 |
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) |
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type csvExport struct { |
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rows *sql.Rows |
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bar *progressbar.ProgressBar |
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file *os.File |
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exportPath string |
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columns []string |
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} |
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func NewCsvExport(rows *sql.Rows, exportPath string, bar *progressbar.ProgressBar) exportdata.Export { |
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return &csvExport{rows: rows, exportPath: exportPath, bar: bar} |
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} |
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// Export rows in file |
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func (c *csvExport) Export() error { |
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if err := c.loadColumns(); err != nil { |
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return fmt.Errorf("failed to load columns: %w", err) |
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} |
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if err := c.openFile(); err != nil { |
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return fmt.Errorf("failed to open file: %w", err) |
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} |
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w := csv.NewWriter(c.file) |
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defer w.Flush() |
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if err := w.Write(c.columns); err != nil { |
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return fmt.Errorf("failed to write headers: %w", err) |
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} |
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for c.rows.Next() { |
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_ = c.bar.Add(1) |
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if err := c.readAndAppendFile(w); err != nil { |
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return fmt.Errorf("failed to read and append line in file: %w", err) |
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} |
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} |
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return nil |
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} |
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// readAndAppendFile read line and append in file |
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func (c *csvExport) readAndAppendFile(w *csv.Writer) error { |
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values := make([]interface{}, len(c.columns)) |
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pointers := make([]interface{}, len(c.columns)) |
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for i := range values { |
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pointers[i] = &values[i] |
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} |
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if err := c.rows.Scan(pointers...); err != nil { |
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return fmt.Errorf("failed to load row: %w", err) |
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} |
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if err := w.Write(c.convertToStringArray(values)); err != nil { |
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return fmt.Errorf("failed to write row: %w", err) |
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} |
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return nil |
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} |
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// convertToStringArray convert string array to string array |
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func (c *csvExport) convertToStringArray(records []interface{}) []string { |
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values := make([]string, 0, len(records)) |
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for _, r := range records { |
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values = append(values, r.(string)) |
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} |
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return values |
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} |
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// Close execute in defer |
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func (c *csvExport) Close() error { |
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defer func(file *os.File) { |
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_ = file.Close() |
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}(c.file) |
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return nil |
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} |
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// openFile open file |
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func (c *csvExport) openFile() error { |
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if _, err := os.Stat(c.exportPath); !os.IsNotExist(err) { |
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err := os.Remove(c.exportPath) |
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if err != nil { |
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return fmt.Errorf("failed to remove file: %w", err) |
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} |
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} |
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if err := os.MkdirAll(filepath.Dir(c.exportPath), os.ModePerm); err != nil { |
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return fmt.Errorf("failed to create path: %w", err) |
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} |
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file, err := os.OpenFile(c.exportPath, os.O_APPEND|os.O_CREATE|os.O_WRONLY, fileModeDefault) |
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if err != nil { |
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return fmt.Errorf("failed to open file %s: %w", c.exportPath, err) |
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} |
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c.file = file |
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return nil |
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} |
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// loadColumns load columns |
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func (c *csvExport) loadColumns() error { |
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columns, err := c.rows.Columns() |
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if err != nil { |
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return fmt.Errorf("failed to load columns: %w", err) |
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} |
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c.columns = columns |
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return nil |
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} |
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adrianolaselva /
csvql
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