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
		e   error
	)

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

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

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

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

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

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

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

	return e
}