ETH与EOS两者智能合约进行简单的对比。
1、编译智能合约（合约编译成.wasm与.abi格式后即可部署到区块链）
[root@C03-12U-26 testcontract]# cat testcontract.cpp
#include <eosiolib/eosio.hpp>
class [[eosio::contract]] testcontract : public eosio::contract
{
public:
testcontract( eosio::name receiver, eosio::name code, eosio::datastream<const char*> ds )
: eosio::contract(receiver, code, ds), _students(receiver, code.value)
{}
//添加学生
[[eosio::action]]
void add(eosio::name user, std::string studentName,std::string studentGender,uint32_t studentAge,uint32_t studentHeight)
{
require_auth(user);
eosio::print("Add student ", studentName);
_students.emplace(get_self(), [&](auto& p) {
p.id = _students.available_primary_key();
p.studentName = studentName;
p.studentGender = studentGender;
p.studentAge = studentAge;
p.studentHeight = studentHeight;
});
}
//根据主键删除学生
[[eosio::action]]
void del(eosio::name user, uint64_t id)
{
require_auth(user);
eosio::print("Del student", id);
auto itr = _students.find(id);
if (itr != _students.end()) {
_students.erase(itr);
}
}
//根据主键修改学生
[[eosio::action]]
void update(eosio::name user, uint64_t id,std::string studentName,std::string studentGender,uint32_t studentAge,uint32_t studentHeight)
{
require_auth(user);
eosio::print("update student", studentName);
auto itr = _students.find(id);
if (itr != _students.end())
{
_students.modify(itr, user, [&]( auto& p ) {
p.studentName = studentName;
p.studentGender = studentGender;
p.studentAge = studentAge;
p.studentHeight = studentHeight;
});
}
}
//清空表,待定
[[eosio::action]]
void clear(eosio::name user)
{
require_auth(user);
std::vector<uint64_t> keysForDeletion;
for(auto& item : _students) {
keysForDeletion.push_back(item.id);
}
for (uint64_t key : keysForDeletion) {
eosio::print("remove from _students ", key);
auto itr = _students.find(key);
if (itr != _students.end()) {
_students.erase(itr);
}
}
}
//private: -- not private so the cleos get table call can see the table data.
// create the multi index tables to store the data
struct [[eosio::table]] students
{
uint64_t id; // primary key
std::string studentName;
std::string studentGender;
uint32_t studentAge;
uint32_t studentHeight;
uint64_t primary_key() const { return id; }
uint64_t by_age() const {return studentAge; }
};
//数据表根据age排序
typedef eosio::multi_index<"students"_n, students, eosio::indexed_by<"studentage"_n, eosio::const_mem_fun<students, uint64_t, &students::by_age>>> studentstable;
//students数据库表
studentstable _students;
};
EOSIO_DISPATCH( testcontract, (add)(del)(update)(clear))
2、部署智能合约
解锁账号钱包
cleos -u https://jungle2.cryptolions.io:443 wallet unlock -n zmcheng-wallet
部署合约
cleos -u https://jungle2.cryptolions.io:443 set contract zmcheng12345 /root/github.com/testcontract -p zmcheng12345@active
Reading WASM from /root/github.com/testcontract/testcontract.wasm...
Publishing contract...
executed transaction: 785f421fe911a142b7cc4b15131cf3f4947847531ed8c52150aa148fe405ea0d 7536 bytes 1560 us
# eosio <= eosio::setcode {"account":"zmcheng12345","vmtype":0,"vmversion":0,"code":"0061736d0100000001d0012060000060037f7e7e0...
# eosio <= eosio::setabi {"account":"zmcheng12345","abi":"0e656f73696f3a3a6162692f312e3100050361646400050475736572046e616d650...
warning: transaction executed locally, but may not be confirmed by the network yet
调用合约（增删改查）
[root@C03-12U-26 testcontract]# cleos -u https://jungle2.cryptolions.io:443 push action zmcheng12345 add '["zmcheng12345","zmcheng","male",25,170]' -p zmcheng12345@active
executed transaction: a64271659aea1ce07fd05a4ff1bb0188c441de04263f3a18b819cbee205d2bbd 128 bytes 273 us
# zmcheng12345 <= zmcheng12345::add {"user":"zmcheng12345","studentName":"zmcheng","studentGender":"male","studentAge":25,"studentHeight...
>> Add student zmcheng
warning: transaction executed locally, but may not be confirmed by the network yet ]
[root@C03-12U-26 testcontract]# cleos -u https://jungle2.cryptolions.io:443 get table zmcheng12345 zmcheng12345 students
{
"rows": [{
"id": 0,
"studentName": "zmcheng",
"studentGender": "male",
"studentAge": 25,
"studentHeight": 170
},{
"id": 1,
"studentName": "www",
"studentGender": "male",
"studentAge": 26,
"studentHeight": 170
}
],
"more": false
}
[root@C03-12U-26 testcontract]# cleos -u https://jungle2.cryptolions.io:443 push action zmcheng12345 update '["zmcheng12345",1,"www","male",12,123]' -p zmcheng12345@active
executed transaction: 765c35452964de54771c3fe505daad272a8a53ec61954a2cc43350f7f84e86e3 128 bytes 213 us
# zmcheng12345 <= zmcheng12345::update {"user":"zmcheng12345","id":1,"studentName":"www","studentGender":"male","studentAge":12,"studentHei...
>> update studentwww
warning: transaction executed locally, but may not be confirmed by the network yet ]
[root@C03-12U-26 testcontract]# cleos -u https://jungle2.cryptolions.io:443 get table zmcheng12345 zmcheng12345 students
{
"rows": [{
"id": 0,
"studentName": "zmcheng",
"studentGender": "male",
"studentAge": 25,
"studentHeight": 170
},{
"id": 1,
"studentName": "www",
"studentGender": "male",
"studentAge": 12,
"studentHeight": 123
}
],
"more": false
}
[root@C03-12U-26 testcontract]#
[root@C03-12U-26 testcontract]# cleos -u https://jungle2.cryptolions.io:443 push action zmcheng12345 del '["zmcheng12345",1]' -p zmcheng12345@active
executed transaction: 1a64a42ebccac0f9b7061c42a0fa8daaebe7b1a18db1cb058fe479608ee9170a 112 bytes 255 us
# zmcheng12345 <= zmcheng12345::del {"user":"zmcheng12345","id":1}
>> Del student1
warning: transaction executed locally, but may not be confirmed by the network yet ]
[root@C03-12U-26 testcontract]# cleos -u https://jungle2.cryptolions.io:443 get table zmcheng12345 zmcheng12345 students
{
"rows": [{
"id": 0,
"studentName": "zmcheng",
"studentGender": "male",
"studentAge": 25,
"studentHeight": 170
}
],
"more": false
}