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// dbasik provides a service with which to convert spreadsheets containing
// data to JSON for further processing.
// Copyright (C) 2024 M R Lemon
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
package main
import (
"database/sql"
"errors"
"time"
)
// ErrRecordNotFound A custom err to return from our Get() method when looking up a Datamap
// that doesn't exist
var (
ErrRecordNotFound = errors.New("record not found")
)
// A Models struct wraps the DatmapModel. We can add other models to this as
// we progress
type Models struct {
Datamaps datamapModel
DatamapLines datamapLineModel
}
// DatamapLine holds the data parsed from each line of a submitted Datamap CSV file.
// The fields need to be exported otherwise they won't be included when encoding
// the struct to json.
type DatamapLine struct {
ID int64 `json:"id"`
Key string `json:"key"`
Sheet string `json:"sheet"`
DataType string `json:"datatype"`
CellRef string `json:"cellref"`
}
type datamapLineModel struct {
DB *sql.DB
}
// Datamap includes a slice of DatamapLine objects alongside header metadata
type Datamap struct {
ID int64 `json:"id"`
Name string `json:"name"`
Description string `json:"description"`
Created time.Time `json:"created"`
DMLs []DatamapLine `json:"datamap_lines"`
}
type datamapModel struct {
DB *sql.DB
}
// GetSheetsFromDM extracts a set of sheet names from a Datamap struct
func GetSheetsFromDM(dm Datamap) []string {
// this is basically how sets are done in Go - see https://www.sohamkamani.com/golang/sets/
sheets := map[string]struct{}{}
for _, dml := range dm.DMLs {
sheets[dml.Sheet] = struct{}{}
}
var out []string
for sheet := range sheets {
out = append(out, sheet)
}
return out
}
func NewModels(db *sql.DB) Models {
return Models{
Datamaps: datamapModel{DB: db},
DatamapLines: datamapLineModel{DB: db},
}
}
func (m *datamapLineModel) Insert(dm Datamap, dmls []DatamapLine) (int, error) {
var datamapID int64
tx, err := m.DB.Begin()
if err != nil {
return 0, err
}
err = m.DB.QueryRow(`INSERT INTO datamaps (name, description, created)
VALUES ($1, $2, CURRENT_TIMESTAMP)
RETURNING id`, dm.Name, dm.Description).Scan(&datamapID)
if err != nil {
return 0, err
}
stmt, err := tx.Prepare(`INSERT INTO datamap_lines
(datamap_id, key, sheet, data_type, cellref)
VALUES ($1, $2, $3, $4, $5)`)
if err != nil {
return 0, err
}
defer stmt.Close()
for _, line := range dmls {
_, err := stmt.Exec(
int64(datamapID),
line.Key,
line.Sheet,
line.DataType,
line.CellRef)
if err != nil {
tx.Rollback()
return 0, err
}
}
tx.Commit()
return int(datamapID), nil
}
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