BSC链智能合约搭建
代码语言：javascript复制
#include "vntlib.h"
KEY address owner;
KEY uint32 last_completed_migration;
constructor Migrations()
{
owner = GetSender();
}
void onlyOwner()
{
Require(Equal(owner, GetSender()), "is not owner");
}
MUTABLE
void setCompleted(uint32 completed)
{
onlyOwner();
last_completed_migration = completed;
}
UNMUTABLE
uint32 get_last_completed_migration()
{
return last_completed_migration;
}
初始化migrate智能合约
bottle需要有一个migrate智能合约才能使用bottle migrate功能，该智能合约包含特定的接口，会在第一次执行botlte migrate时部署，此后将不会更新。在使用bottle init创建新项目时，会默认创建该智能合约。
// Deploy a single contract without constructor arguments
deployer.deploy(A);
// Deploy a single contract with constructor arguments
deployer.deploy(A, arg1, arg2, ...);
// Don't deploy this contract if it has already been deployed
deployer.deploy(A, {overwrite: false});
// Set a maximum amount of gas and `from` address for the deployment
deployer.deploy(A, {gas: 4612388, from: "0x...."});
// External dependency example:
//
// For this example, our dependency provides an address when we're deploying to the
// live network, but not for any other networks like testing and development.
// When we're deploying to the live network we want it to use that address, but in
// testing and development we need to deploy a version of our own. Instead of writing
// a bunch of conditionals, we can simply use the `overwrite` key.
deployer.deploy(SomeDependency, {overwrite: false});
