PackageManager/Client/Database/InstalledPkgs.go

package Database

import (
	"database/sql"
	"time"

	_ "github.com/mattn/go-sqlite3"
)

func IsPackageInstalled(name, version string) (int64, error) {
	var (
		row *sql.Row
		id  int64
		err error
	)

	row = DB.QueryRow(`
SELECT id FROM installed_packages WHERE name = ? AND version = ?;
	`, name, version)

	err = row.Scan(&id)
	return id, err
}

func InsertPackage(name, version string, depIds []int64) error {
	var (
		stmt   *sql.Stmt
		result sql.Result
		pkgId  int64
		depId  int64
		err    error
	)

	stmt, err = DB.Prepare("INSERT INTO installed_packages(name, version, installed_at) VALUES(?,?,?)")
	if err != nil {
		return err
	}

	result, err = stmt.Exec(name, version, time.Now().Unix())
	if err != nil {
		return err
	}

	pkgId, err = result.LastInsertId()
	if err != nil {
		return err
	}

	for _, depId = range depIds {
		stmt, err = DB.Prepare("INSERT INTO dependancy_linker(package_id, dependancy_id) VALUES(?,?)")
		if err != nil {
			return err
		}

		_, err = stmt.Exec(pkgId, depId)
		if err != nil {
			return err
		}
	}

	return err
}