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区块链学习笔记(12)[ ETH-智能合约 ]

  • 2026-03-14 14:49:13
区块链学习笔记(12)[ ETH-智能合约 ]
智能合约是以太坊的精髓，也是以太坊和比特币的本质区别。
智能合约是运行在区块链上的一段代码，代码的逻辑定义了合约的内容。Solidity是智能合约常用的语言，具体代码就不研究了，毕竟我们以学习逻辑为主。
下图为一个公开拍卖的智能合约示例：
智能合约的创建和运行：
用户调用智能合约时，需要支付汽油费（Gas fee），不同的合约指令消耗的汽油费不一样。
在2021年8月之前，用户支付的所有汽油费，100%都归矿工所有，这笔钱全部作为矿工打包交易的奖励。
2021年8月之后，大部分汽油费被销毁，相当于从流通中永久移除了这部分ETH，小部分支付给了矿工（现在叫验证者）。
在调用智能合约时，有可能会出错。比如：账户里的余额不够支付汽油费。或者出现下列情况：
这时，会造成整个交易回滚，退回交易执行前的状态，并且已经消耗的汽油费不退。这相当于控制交易数量的措施。
嵌套调用规则：
在区块链中，code is law ,在智能合约设计时，一定要反复测试，一旦上链，就不可更改。
本文来自网友投稿或网络内容，如有侵犯您的权益请联系我们删除，联系邮箱：wyl860211@qq.com 。

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  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000715s ]
  11. SELECT * FROM `article` WHERE `id` < 474281 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001227s ]
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  13. SELECT * FROM `article` WHERE `id` < 474281 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.007282s ]
  14. SELECT * FROM `article` WHERE `id` < 474281 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001949s ]
  15. SELECT * FROM `article` WHERE `id` < 474281 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.004443s ]
0.225815s