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// SPDX-License-Identifier: GPL-3.0-or-later
package postgres
import (
"context"
"database/sql"
)
func (p *Postgres) doQueryRow(query string, v any) error {
ctx, cancel := context.WithTimeout(context.Background(), p.Timeout.Duration())
defer cancel()
return p.db.QueryRowContext(ctx, query).Scan(v)
}
func (p *Postgres) doDBQueryRow(db *sql.DB, query string, v any) error {
ctx, cancel := context.WithTimeout(context.Background(), p.Timeout.Duration())
defer cancel()
return db.QueryRowContext(ctx, query).Scan(v)
}
func (p *Postgres) doQuery(query string, assign func(column, value string, rowEnd bool)) error {
return p.doDBQuery(p.db, query, assign)
}
func (p *Postgres) doDBQuery(db *sql.DB, query string, assign func(column, value string, rowEnd bool)) error {
ctx, cancel := context.WithTimeout(context.Background(), p.Timeout.Duration())
defer cancel()
rows, err := db.QueryContext(ctx, query)
if err != nil {
return err
}
defer func() { _ = rows.Close() }()
return readRows(rows, assign)
}
func readRows(rows *sql.Rows, assign func(column, value string, rowEnd bool)) error {
if assign == nil {
return nil
}
columns, err := rows.Columns()
if err != nil {
return err
}
values := makeValues(len(columns))
for rows.Next() {
if err := rows.Scan(values...); err != nil {
return err
}
for i, l := 0, len(values); i < l; i++ {
assign(columns[i], valueToString(values[i]), i == l-1)
}
}
return rows.Err()
}
func valueToString(value any) string {
v, ok := value.(*sql.NullString)
if !ok || !v.Valid {
return ""
}
return v.String
}
func makeValues(size int) []any {
vs := make([]any, size)
for i := range vs {
vs[i] = &sql.NullString{}
}
return vs
}
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