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MySQL，招聘要求里出现频率很高。",[1559,1720,1721,1724],{},[1545,1722,1723],{},"生态成熟","：文档、教程、工具都很丰富，和 Node.js 搭配开发是非常常见的组合。",[1531,1726,1727],{},"对前端同学来说，学会 MySQL 就等于补上了后端开发里数据存储这一环，之后写接口、做项目就有了完整的链路。",[1535,1729],{},[1526,1731,1733],{"id":1732},"用-docker-安装-mysql","🛠 用 Docker 安装 MySQL",[1531,1735,1736,1737,1739],{},"安装 MySQL 有多种方式，本课程推荐用 ",[1545,1738,1244],{}," 运行。好处是：一条命令就能启动一个干净的 MySQL 环境，不污染你的电脑，不想要了删掉容器就行。",[1531,1741,1742,1743,1691,1746,1749],{},"本文及本课程基于 ",[1545,1744,1745],{},"MySQL 8.x",[1545,1747,1748],{},"Docker 运行环境","编写和验证。",[1531,1751,1752],{},"如果你还没有安装 Docker，先安装 Docker Desktop（官网下载对应系统版本即可）。装好后打开终端，执行：",[1661,1754,1758],{"className":1755,"code":1756,"language":1757,"meta":1666,"style":1666},"language-bash shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","docker run --name mysql8 -e MYSQL_ROOT_PASSWORD=123456 -p 3306:3306 -d mysql:8\n","bash",[1579,1759,1760],{"__ignoreMap":1666},[1670,1761,1762,1766,1770,1773,1776,1779,1782,1786,1789,1792,1795],{"class":1672,"line":1673},[1670,1763,1765],{"class":1764},"sYGMc","docker",[1670,1767,1769],{"class":1768},"sIEYB"," run",[1670,1771,1772],{"class":1768}," --name",[1670,1774,1775],{"class":1768}," mysql8",[1670,1777,1778],{"class":1768}," -e",[1670,1780,1781],{"class":1768}," MYSQL_ROOT_PASSWORD=",[1670,1783,1785],{"class":1784},"smPcV","123456",[1670,1787,1788],{"class":1768}," -p",[1670,1790,1791],{"class":1768}," 3306:3306",[1670,1793,1794],{"class":1768}," -d",[1670,1796,1797],{"class":1768}," mysql:8\n",[1531,1799,1800],{},"这条命令各部分的意思是：",[1556,1802,1803,1813,1822,1828,1834],{},[1559,1804,1805,1808,1809,1812],{},[1579,1806,1807],{},"--name mysql8","：给容器起名叫 ",[1579,1810,1811],{},"mysql8","，方便后续操作。",[1559,1814,1815,1818,1819,1821],{},[1579,1816,1817],{},"-e MYSQL_ROOT_PASSWORD=123456","：设置 root 用户的密码为 ",[1579,1820,1785],{},"，学习阶段用简单密码即可。",[1559,1823,1824,1827],{},[1579,1825,1826],{},"-p 3306:3306","：把容器的 3306 端口映射到本机的 3306 端口，3306 是 MySQL 的默认端口。",[1559,1829,1830,1833],{},[1579,1831,1832],{},"-d","：让容器在后台运行。",[1559,1835,1836,1839],{},[1579,1837,1838],{},"mysql:8","：使用 MySQL 8 版本的镜像。",[1531,1841,1842],{},"第一次执行会自动下载镜像，耐心等待下载完成即可。",[1844,1845,1846],"warning",{},[1531,1847,1848,1849,1852],{},"Docker Desktop 的界面会不定期更新，按钮名称和入口位置可能与你看到的略有不同。以上流程仅供参考，核心思路不变：用 ",[1579,1850,1851],{},"docker run"," 启动容器，操作时以你本地的实际界面和命令行为准。",[1683,1854,1855],{},[1531,1856,1857,1858,1861,1862,1864],{},"之后电脑重启，容器会停止，执行 ",[1579,1859,1860],{},"docker start mysql8"," 就能再次启动，不需要重新执行 ",[1579,1863,1851],{},"。",[1535,1866],{},[1526,1868,1870],{"id":1869},"连接-mysql-并验证","🛠 连接 MySQL 并验证",[1531,1872,1873],{},"容器启动后，我们用 MySQL 自带的命令行客户端连上去验证一下。执行：",[1661,1875,1877],{"className":1755,"code":1876,"language":1757,"meta":1666,"style":1666},"docker exec -it mysql8 mysql -uroot -p\n",[1579,1878,1879],{"__ignoreMap":1666},[1670,1880,1881,1883,1886,1889,1891,1894,1897],{"class":1672,"line":1673},[1670,1882,1765],{"class":1764},[1670,1884,1885],{"class":1768}," exec",[1670,1887,1888],{"class":1768}," -it",[1670,1890,1775],{"class":1768},[1670,1892,1893],{"class":1768}," mysql",[1670,1895,1896],{"class":1768}," -uroot",[1670,1898,1899],{"class":1768}," -p\n",[1531,1901,1902,1903,1905,1906,1909],{},"回车后会提示输入密码，输入刚才设置的 ",[1579,1904,1785],{},"（输入时不会显示字符，正常现象），再按回车。看到 ",[1579,1907,1908],{},"mysql>"," 提示符，就说明连接成功了。",[1531,1911,1912],{},"接着执行第一条 SQL 语句，查看数据库版本：",[1661,1914,1916],{"className":1663,"code":1915,"language":1665,"meta":1666,"style":1666},"SELECT VERSION();\n",[1579,1917,1918],{"__ignoreMap":1666},[1670,1919,1920],{"class":1672,"line":1673},[1670,1921,1915],{},[1531,1923,1924,1925,1928,1929,1932],{},"能看到类似 ",[1579,1926,1927],{},"8.x.x"," 的版本号输出，恭喜你，MySQL 环境已经准备就绪。想退出客户端时，输入 ",[1579,1930,1931],{},"exit"," 回车即可。",[1683,1934,1935],{},[1531,1936,1937],{},"日常开发中，很多人会用图形化工具（如 TablePlus、DBeaver）连接数据库，看表、写 SQL 都更直观。学习阶段先跟着命令行把 SQL 练熟，之后可以再按喜好选择工具。",[1535,1939],{},[1526,1941,1943],{"id":1942},"小节总结","🧾 小节总结",[1556,1945,1946,1949,1952,1955,1958,1964],{},[1559,1947,1948],{},"数据库是长期存储和管理数据的软件，可以用 Excel 类比：数据库像工作簿，表像 sheet，行像一条记录。",[1559,1950,1951],{},"MySQL 是关系型数据库，数据存放在二维表中，表和表之间可以建立关联。",[1559,1953,1954],{},"SQL 是操作关系型数据库的通用语言，语法接近自然语言。",[1559,1956,1957],{},"MySQL 开源免费、使用广泛，和 Node.js 搭配开发很常见。",[1559,1959,1960,1961,1864],{},"用 Docker 一条命令即可运行 MySQL 8：",[1579,1962,1963],{},"docker run --name mysql8 -e MYSQL_ROOT_PASSWORD=123456 -p 3306:3306 -d mysql:8",[1559,1965,1966,1967,1970,1971,1974],{},"用 ",[1579,1968,1969],{},"docker exec -it mysql8 mysql -uroot -p"," 进入客户端，执行 ",[1579,1972,1973],{},"SELECT VERSION();"," 验证连接。",[1535,1976],{},[1526,1978,1980],{"id":1979},"知识问答","❓ 知识问答",[1531,1982,1983],{},[1545,1984,1985],{},"Q1：localStorage 也能存数据，为什么还要学数据库？",[1531,1987,1988],{},"localStorage 存在浏览器里，只能存少量文本，且换台设备就没有了。数据库存储在服务器上，容量大、能多人同时读写、数据有统一的管理和备份，是真实项目的标准做法。",[1531,1990,1991],{},[1545,1992,1993],{},"Q2：SQL 和 MySQL 是一回事吗？",[1531,1995,1996],{},"不是。SQL 是一门查询语言，MySQL 是一个数据库软件，我们用 SQL 语言去操作 MySQL。可以类比：SQL 像普通话，MySQL 像一个听得懂普通话的人。",[1531,1998,1999],{},[1545,2000,2001],{},"Q3：为什么推荐用 Docker 而不是直接安装 MySQL？",[1531,2003,2004],{},"直接安装需要处理系统配置、服务启动等细节，容易遇到环境差异问题。Docker 把环境打包好了，一条命令就能得到一致的 MySQL 环境，删除时也不留残余，适合学习阶段。",[1531,2006,2007],{},[1545,2008,2009],{},"Q4：容器删掉后，里面的数据还在吗？",[1531,2011,2012],{},"容器删除后数据会一起消失。学习阶段这反而方便，随时可以推倒重来。需要长期保存数据时，可以挂载数据卷，本文暂不展开。",[1531,2014,2015],{},[1545,2016,2017],{},"Q5：端口 3306 被占用了怎么办？",[1531,2019,2020,2021,2024],{},"说明本机 3306 端口已有程序在使用。可以把映射改成本机的其他端口，比如 ",[1579,2022,2023],{},"-p 3307:3306","，连接时使用 3307 即可。",[1535,2026],{},[1526,2028,2030],{"id":2029},"小练习","🧪 小练习",[2032,2033,2034,2044],"ol",{},[1559,2035,2036,2037,2040,2041,2043],{},"停掉容器再启动一次：分别执行 ",[1579,2038,2039],{},"docker stop mysql8"," 和 ",[1579,2042,1860],{},"，然后重新进入客户端，验证容器可以反复使用。",[1559,2045,2046],{},"进入 MySQL 客户端后，执行一条 SQL 查看当前时间，试着自己写出来：",[1661,2048,2050],{"className":1663,"code":2049,"language":1665,"meta":1666,"style":1666},"-- 提示：使用 NOW() 函数\n-- 请在这里编写 SQL\n",[1579,2051,2052,2057],{"__ignoreMap":1666},[1670,2053,2054],{"class":1672,"line":1673},[1670,2055,2056],{},"-- 提示：使用 NOW() 函数\n",[1670,2058,2060],{"class":1672,"line":2059},2,[1670,2061,2062],{},"-- 请在这里编写 SQL\n",[1535,2064],{},[1531,2066,2067,2068,2070],{},"🎉 恭喜你已经掌握了数据库的基本概念，并在本地成功运行了 MySQL！下一篇我们学习数据库和数据表的增删改查，亲手创建属于我们的第一张 ",[1579,2069,1581],{}," 表。",[2072,2073,2074],"style",{},"html .light .shiki span {color: var(--shiki-light);background: var(--shiki-light-bg);font-style: var(--shiki-light-font-style);font-weight: var(--shiki-light-font-weight);text-decoration: var(--shiki-light-text-decoration);}html.light .shiki span {color: var(--shiki-light);background: var(--shiki-light-bg);font-style: var(--shiki-light-font-style);font-weight: var(--shiki-light-font-weight);text-decoration: var(--shiki-light-text-decoration);}html .default .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html .dark .shiki span {color: var(--shiki-dark);background: var(--shiki-dark-bg);font-style: var(--shiki-dark-font-style);font-weight: var(--shiki-dark-font-weight);text-decoration: var(--shiki-dark-text-decoration);}html.dark .shiki span {color: var(--shiki-dark);background: var(--shiki-dark-bg);font-style: var(--shiki-dark-font-style);font-weight: var(--shiki-dark-font-weight);text-decoration: var(--shiki-dark-text-decoration);}html pre.shiki code .sYGMc, html code.shiki .sYGMc{--shiki-light:#E2931D;--shiki-default:#FFCB6B;--shiki-dark:#FFCB6B}html pre.shiki code .sIEYB, html code.shiki .sIEYB{--shiki-light:#91B859;--shiki-default:#C3E88D;--shiki-dark:#C3E88D}html pre.shiki code .smPcV, html code.shiki .smPcV{--shiki-light:#F76D47;--shiki-default:#F78C6C;--shiki-dark:#F78C6C}",{"title":1666,"searchDepth":2059,"depth":2059,"links":2076},[2077,2078,2079,2080,2081,2082,2083,2084,2085],{"id":1528,"depth":2059,"text":1529},{"id":1539,"depth":2059,"text":1540},{"id":1644,"depth":2059,"text":1645},{"id":1700,"depth":2059,"text":1701},{"id":1732,"depth":2059,"text":1733},{"id":1869,"depth":2059,"text":1870},{"id":1942,"depth":2059,"text":1943},{"id":1979,"depth":2059,"text":1980},{"id":2029,"depth":2059,"text":2030},"了解数据库和 MySQL 是什么，学会用 Docker 在本地运行 MySQL 并成功连接。","md",null,{},{"title":1278},{"title":1521,"description":2086},"iIjr9tf8cE",[2094,2096],{"title":1268,"path":1269,"stem":1270,"description":2095,"children":-1},"学会用 Docker Compose 通过一个配置文件编排和管理多个容器。",{"title":1284,"path":1285,"stem":1286,"description":2097,"children":-1},"学会创建数据库和数据表，掌握 INSERT、SELECT、UPDATE、DELETE 四种基本操作。",1784715105014]