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73 lines
1.6 KiB
73 lines
1.6 KiB
package themis
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import (
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"database/sql"
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"fmt"
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"strings"
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)
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func FormatRows(rows *sql.Rows) (string, error) {
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sb := strings.Builder{}
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cols, err := rows.Columns()
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if err != nil {
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return "", fmt.Errorf("failed to get rows columns: %w", err)
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}
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c := make([]string, len(cols))
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for i := range c {
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c[i] = " %-*s "
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}
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pattern := fmt.Sprintf("|%s|\n", strings.Join(c, "|"))
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lengths := make([]int, len(cols))
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for i := range lengths {
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lengths[i] = len(cols[i])
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}
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scanned := make([][]any, 0)
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for rows.Next() {
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row := make([]interface{}, len(cols))
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for i := range row {
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row[i] = new(sql.NullString)
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}
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if err := rows.Scan(row...); err != nil {
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return "", fmt.Errorf("failed to scan next row: %w", err)
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}
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scanned = append(scanned, row) // keep track of row for later
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for i, a := range row {
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s := a.(*sql.NullString)
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if len(s.String) > lengths[i] {
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lengths[i] = len(s.String)
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}
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}
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}
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// Write column names
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curr := make([]any, 0, 2*len(cols))
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for i := range lengths {
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curr = append(curr, lengths[i], cols[i])
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}
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sb.WriteString(fmt.Sprintf(pattern, curr...))
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// Write header separator row
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curr = curr[:0] // empty slice but preserve capacity
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for i := range lengths {
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curr = append(curr, lengths[i], strings.Repeat("-", lengths[i]))
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}
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sb.WriteString(fmt.Sprintf(pattern, curr...))
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// iterate rows and write each one
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for _, r := range scanned {
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curr = curr[:0] // empty slice but preserve capacity
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for i := range lengths {
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s := r[i].(*sql.NullString)
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curr = append(curr, lengths[i], *s)
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}
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sb.WriteString(fmt.Sprintf(pattern, curr...))
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}
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return sb.String(), nil
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}
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