DART somo la 45: Jinai ys kutuma mysql database

Sasa rudi kwenye software yako uliokuwa ukitumia toka masomo yaliotangulia. Kwa mimi natumia webstorm hivyo nitaifunguwa webstorm kisha nita open project ambayo yumeitengeneza. Kumbuka utaikuta kwenye disk c kama ilivyoelekezwa kwenye somo lililopita.

Baada ya kuifunguwa project yako utaona kuna mafolda na mafaili kadhaa kama inavyoonyeshwa kwenye picha hapo chini. Unachotakiw akufanya nikubofya folda lililoandikwa bin humo utakuta faili limendaika tehama.dart hilo ndio faili ambalo tutakwenda kulifanyia kazi.

Humo utakuta kuna baadhi ya code tayari zipo sasa futa zote pawe patupu, ili tuanze upya kabisa. Kwanza kabisa tutaanza na ku import dart mysql package kwa kutumia import 'package:mysql1/mysql1.dart';

Hakikisha tayari una jina la database, username, na password ya hiyo database.  Sasa vizuri uwe na database kutoka kwenye real hosting, hata hivyo unaweza kutumia free kama nilivyokuelekeza katika somo lililopita, ijapokuwa database za free baadhi ya vipengele vinaweza vikasumbuwa. Hapa nakwenda kutumia real database kutoka kwenye hosting ya kulipia,  hivyo ni matumaini yangu utaelewa vyema.

1. Jinsi ya kuunganisha database:

Hatuwa ya kwanza ni kuu ganisha database yako.

import 'package:mysql1/mysql1.dart';

import 'package:test/expect.dart';

import 'dart:async';

Future main() async {

 //funguwa connection

 final conn = await MySqlConnection.connect(ConnectionSettings(

     host: 'mydbhost.com',

     port: 3306,

     user: 'test',

     db: 'user_test',

     password: 'pass'));

if(conn !=isNull){

 print("connected");

}else{

 print("failed to connect");

}

 await conn.close();

}

Hapo nimetumia async  programming kwa ajili ya kupata future.kisha nikatengeneza fariable ambayo itatumia kuangalia connection ambayo ni conn. Baada ya hapo hatuwa inayofuata ni kutengeneza table. Mpaka sasa kwenye database yangu hakuna table.

Nakwenda kutengeneza table yenye column 3 ambazo ni id, jina, email. Tafadhali rejea mafunzo ya datbase kama concept hizi za kutumia dtabase zinakusumbuwa tutatumia query hii CREATE TABLE users (id int NOT NULL AUTO_INCREMENT PRIMARY KEY, name varchar(255), email varchar(255), age int

Angalia mfano hapo chini:-

import 'package:mysql1/mysql1.dart';

import 'package:test/expect.dart';

import 'dart:async';

Future main() async {

 //funguwa connection

 final conn = await MySqlConnection.connect(ConnectionSettings(

     host: 'mydbhost.com',

     port: 3306,

     user: 'test',

     db: 'user_test',

     password: 'pass'));

if(conn !=isNull){

 print("connected");

}else{

 print("failed to connect");

}

// Create a table

 await conn.query(

     'CREATE TABLE users (id int NOT NULL AUTO_INCREMENT PRIMARY KEY, name varchar(255), email varchar(255), age int)');

 await conn.close();

}

Hapo utaona tayari database yetu ina table ya users yenye column 4 mabzo ni id, age, name na email. Hatuwa inayouata ni kuingiza data kwenye table yetu.

import 'package:mysql1/mysql1.dart';

import 'package:test/expect.dart';

import 'dart:async';

Future main() async {

 //funguwa connection

 final conn = await MySqlConnection.connect(ConnectionSettings(

     host: 'mydbhost.com',

     port: 3306,

     user: 'test',

     db: 'user_test',

     password: 'pass'));

if(conn !=isNull){

 print("connected");

}else{

 print("failed to connect");