hyc0812 / simple-storage-truffle

Simple Tutorial explaining how to deploy and interact with smart contract using truffle

Interact with blockchain and smart contract using truffle

Simple Tutorial explaining how to deploy and interact with smart contract using truffle

Run the code:

Spawn a development blockchain locally:

$ truffle develop

It will automatically start a truffle(develop) CLI.

Deploy the smart contract to the development blockchain:

> migrate --reset

Update data:

> let storage = await SimpleStorage.deployed()
> let data = await storage.updateData(10)

Might get message:

✓ Transaction submitted successfully. Hash: 0x3f6f0e5d0ceca3d0a3ecedf35a1b1ca54873e477f94bf9dedd79e8544dcc5293

Read data:

> let read = await storage.readData()
> read.toString()

Get message: '10'

Useful truffle commands:

To list all the accounts' address:

> let accounts = await web3.eth.getAccounts()
> accounts

'0x722CD3807110b915f97Ef732fa50d9c7Dd024f45',

'0x20f3a0D05b6D28e09259328184a126a28C48ec6d',

.....

find out a account address:

> accounts[0]

'0x722CD3807110b915f97Ef732fa50d9c7Dd024f45'

Create contract instance using specific account with a instance name:

> let myContract2 = await SimpleStorage.new("ss123", {from: accounts[9]})

✓ Transaction submitted successfully. Hash: 0x61e68f5097fdbb6b9f3d20c5509dc391ac1badefb04ff88c43c63730080e898a

Set the data:

> let update = await myContract2.updateData(33)

✓ Transaction submitted successfully. Hash: 0xa9de6b6e76f34227250e4ebfeb59617bd6e8de5e901dc3b42628f09219115123

Read data from another account:

> let read = await myContract2.readData({from: accounts[1]})
> read.toString()

'33'

Or read:

> (await myContract2.readData({from: accounts[1]})).toString()