func (b *sqlBuilder) QueryRow(query interface{}, args ...interface{}) (*sql.Row, error) {
switch q := query.(type) {
case *exql.Statement:
return b.sess.StatementQueryRow(q, args...)
case string:
return b.sess.StatementQueryRow(exql.RawSQL(q), args...)
case db.RawValue:
return b.QueryRow(q.Raw(), q.Arguments()...)
default:
return nil, fmt.Errorf("Unsupported query type %T.", query)
}
}
// FindTablePrimaryKeys allows sqladapter find a table's primary keys.
func (d *database) FindTablePrimaryKeys(tableName string) ([]string, error) {
pk := make([]string, 0, 1)
stmt := exql.RawSQL(fmt.Sprintf("PRAGMA TABLE_INFO('%s')", tableName))
rows, err := d.Query(stmt)
if err != nil {
return nil, err
}
columns := []struct {
Name string `db:"name"`
PK int `db:"pk"`
}{}
if err := sqlbuilder.NewIterator(rows).All(&columns); err != nil {
return nil, err
}
maxValue := -1
for _, column := range columns {
if column.PK > 0 && column.PK > maxValue {
maxValue = column.PK
}
}
if maxValue > 0 {
for _, column := range columns {
if column.PK > 0 {
pk = append(pk, column.Name)
}
}
}
return pk, nil
}