98 lines
2.5 KiB
Go
98 lines
2.5 KiB
Go
// Package qsql implements SQL queries for the lazy, in the good ol' hashtable
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// or list of hashtable format.
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package qsql
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import (
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"database/sql"
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"errors"
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)
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// ErrDBIsNil is returned when the *sql.DB inside DB is nil.
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var ErrDBIsNil = errors.New("qsql: db is nil")
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// DB wraps an sql.DB around a custom DB.
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//
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// If you're hardcore and want to create one without New(),
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// you should &qsql.DB{*db}.
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type DB struct {
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sql.DB
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}
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// Exec behaves the same as sql.DB.Exec, however it does not wrap the last
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// insert ID and rows affected into an interface.
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func (d *DB) Exec(query string, params ...interface{}) (int, int, error) {
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res, err := d.DB.Exec(query, params...)
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lid, _ := res.LastInsertId()
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ra, _ := res.RowsAffected()
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return int(lid), int(ra), err
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}
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// ExecNoRes returns sql.DB.Exec without Result.
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func (d *DB) ExecNoRes(query string, params ...interface{}) error {
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_, err := d.DB.Exec(query, params...)
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return err
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}
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// Query queries the database for multiple rows. See sql.DB.Query.
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func (d *DB) Query(query string, params ...interface{}) ([]map[string]String, error) {
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return d.query(query, false, params...)
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}
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// QueryRow queries the database for one row. See sql.DB.QueryRow.
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func (d *DB) QueryRow(query string, params ...interface{}) (map[string]String, error) {
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// sql.Row does not have .Columns(), so we can't really use db.QueryRow.
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// Instead, we use .query, telling it to return after the first row is extracted.
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m, err := d.query(query, true, params...)
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if len(m) > 0 {
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return m[0], err
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}
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return nil, err
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}
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func (d *DB) query(query string, only1 bool, params ...interface{}) ([]map[string]String, error) {
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rows, err := d.DB.Query(query, params...)
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if err != nil {
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return nil, err
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}
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defer rows.Close()
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cols, err := rows.Columns()
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if err != nil {
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return nil, err
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}
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var returnSlice []map[string]String
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for rows.Next() {
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m, args := buildMapAndArgsSlice(cols)
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err := rows.Scan(args...)
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if err != nil {
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return nil, err
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}
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returnSlice = append(returnSlice, depointify(m))
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if only1 {
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return returnSlice, rows.Err()
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}
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}
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return returnSlice, rows.Err()
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}
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func buildMapAndArgsSlice(cols []string) (map[string]*string, []interface{}) {
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m := make(map[string]*string, len(cols))
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sl := make([]interface{}, 0, len(cols))
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for _, col := range cols {
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var newS string
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m[col] = &newS
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sl = append(sl, &newS)
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}
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return m, sl
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}
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func depointify(from map[string]*string) map[string]String {
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m := make(map[string]String, len(from))
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for k, v := range from {
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if v == nil {
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v = new(string)
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}
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m[k] = String(*v)
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}
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return m
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}
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