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MongoClient",[1577,1792,1793],{"class":1721},"(url)",[1577,1795,1748],{"class":1591},[1577,1797,1799],{"class":1579,"line":1798},5,[1577,1800,1754],{"emptyLinePlaceholder":1753},[1577,1802,1804,1807,1810,1813,1816],{"class":1579,"line":1803},6,[1577,1805,1806],{"class":1714},"async",[1577,1808,1809],{"class":1714}," function",[1577,1811,1812],{"class":1595}," main",[1577,1814,1815],{"class":1591},"()",[1577,1817,1818],{"class":1591}," {\n",[1577,1820,1822,1826],{"class":1579,"line":1821},7,[1577,1823,1825],{"class":1824},"s8pZq","    try",[1577,1827,1818],{"class":1591},[1577,1829,1831,1834,1837,1840,1843,1846],{"class":1579,"line":1830},8,[1577,1832,1833],{"class":1824},"        await",[1577,1835,1836],{"class":1721}," client",[1577,1838,1839],{"class":1591},".",[1577,1841,1842],{"class":1595},"connect",[1577,1844,1815],{"class":1845},"sd2Uz",[1577,1847,1748],{"class":1591},[1577,1849,1851,1854,1856,1859,1861,1863,1866,1868,1870],{"class":1579,"line":1850},9,[1577,1852,1853],{"class":1721},"        console",[1577,1855,1839],{"class":1591},[1577,1857,1858],{"class":1595},"log",[1577,1860,1734],{"class":1845},[1577,1862,1737],{"class":1591},[1577,1864,1865],{"class":1587},"连接成功",[1577,1867,1737],{"class":1591},[1577,1869,1745],{"class":1845},[1577,1871,1748],{"class":1591},[1577,1873,1875],{"class":1579,"line":1874},10,[1577,1876,1754],{"emptyLinePlaceholder":1753},[1577,1878,1880,1883,1886,1888,1890,1892,1895,1897,1899,1901,1903,1905],{"class":1579,"line":1879},11,[1577,1881,1882],{"class":1714},"        const",[1577,1884,1885],{"class":1721}," db",[1577,1887,1728],{"class":1591},[1577,1889,1836],{"class":1721},[1577,1891,1839],{"class":1591},[1577,1893,1894],{"class":1595},"db",[1577,1896,1734],{"class":1845},[1577,1898,1737],{"class":1591},[1577,1900,1658],{"class":1587},[1577,1902,1737],{"class":1591},[1577,1904,1745],{"class":1845},[1577,1906,1748],{"class":1591},[1577,1908,1910,1912,1915,1917,1919,1921,1924,1926,1928,1930,1932,1934],{"class":1579,"line":1909},12,[1577,1911,1882],{"class":1714},[1577,1913,1914],{"class":1721}," user",[1577,1916,1728],{"class":1591},[1577,1918,1885],{"class":1721},[1577,1920,1839],{"class":1591},[1577,1922,1923],{"class":1595},"collection",[1577,1925,1734],{"class":1845},[1577,1927,1737],{"class":1591},[1577,1929,1662],{"class":1587},[1577,1931,1737],{"class":1591},[1577,1933,1745],{"class":1845},[1577,1935,1748],{"class":1591},[1577,1937,1939],{"class":1579,"line":1938},13,[1577,1940,1754],{"emptyLinePlaceholder":1753},[1577,1942,1944],{"class":1579,"line":1943},14,[1577,1945,1947],{"class":1946},"syuKq","        // 后续操作都基于 user 这个集合\n",[1577,1949,1951,1954,1957],{"class":1579,"line":1950},15,[1577,1952,1953],{"class":1591},"    }",[1577,1955,1956],{"class":1824}," finally",[1577,1958,1818],{"class":1591},[1577,1960,1962,1964,1966,1968,1971,1973],{"class":1579,"line":1961},16,[1577,1963,1833],{"class":1824},[1577,1965,1836],{"class":1721},[1577,1967,1839],{"class":1591},[1577,1969,1970],{"class":1595},"close",[1577,1972,1815],{"class":1845},[1577,1974,1748],{"class":1591},[1577,1976,1978],{"class":1579,"line":1977},17,[1577,1979,1980],{"class":1591},"    }\n",[1577,1982,1984],{"class":1579,"line":1983},18,[1577,1985,1986],{"class":1591},"}\n",[1577,1988,1990],{"class":1579,"line":1989},19,[1577,1991,1754],{"emptyLinePlaceholder":1753},[1577,1993,1995,1998,2000],{"class":1579,"line":1994},20,[1577,1996,1997],{"class":1595},"main",[1577,1999,1815],{"class":1721},[1577,2001,1748],{"class":1591},[1531,2003,2004],{},"几个关键步骤：",[2006,2007,2008,2015,2021,2031],"ul",{},[2009,2010,2011,2014],"li",{},[1574,2012,2013],{},"new MongoClient(url)","：创建客户端实例，此时还没有真正连接。",[2009,2016,2017,2020],{},[1574,2018,2019],{},"await client.connect()","：发起连接，网络不通或账号密码错误会在这里抛错。",[2009,2022,2023,2026,2027,2030],{},[1574,2024,2025],{},"client.db('blog_demo')","：选中数据库；",[1574,2028,2029],{},"db.collection('user')","：选中集合。这两步只是拿到操作入口，不会真的访问数据库。",[2009,2032,2033,2036,2037,2040],{},[1574,2034,2035],{},"try/finally"," 保证无论中间是否出错，最后都会执行 ",[1574,2038,2039],{},"client.close()"," 关闭连接，避免脚本卡住不退出。",[1531,2042,2043,2044,2047,2048,2050,2051,2053],{},"可以打个比喻：",[1574,2045,2046],{},"client"," 像拨通电话，",[1574,2049,1894],{}," 像找到对应的部门，",[1574,2052,1923],{}," 像找到部门里具体负责的那个人，找到人之后才能开始办事。",[2055,2056,2057],"warning",{},[1531,2058,2059,2060,2063,2064,2067],{},"真实项目中密码不能写死在代码里，要放到环境变量中（比如用 ",[1574,2061,2062],{},".env"," 文件配合 ",[1574,2065,2066],{},"process.env"," 读取），避免提交到代码仓库泄露。学习阶段写死即可，心里有这根弦就行。",[1543,2069],{},[1526,2071,2073],{"id":2072},"完整的增删改查","🛠 完整的增删改查",[1531,2075,2076,2077,2080],{},"下面这个 ",[1574,2078,2079],{},"crud.js"," 覆盖了日常开发中的完整 CRUD：新增、查列表、按 id 查单个、更新、删除。",[1567,2082,2084],{"className":1704,"code":2083,"filename":2079,"language":1707,"meta":1572,"style":1572},"const { MongoClient, ObjectId } = require('mongodb');\n\nconst url = 'mongodb://root:123456@localhost:27017';\nconst client = new MongoClient(url);\n\nasync function main() {\n    try {\n        await client.connect();\n        const user = client.db('blog_demo').collection('user');\n\n        // 新增用户\n        const result = await user.insertOne({\n            username: '小美',\n            age: 22,\n            city: '深圳',\n        });\n        console.log('新增成功，_id =', result.insertedId);\n\n        // 查询用户列表\n        const list = await user.find().toArray();\n        console.log('用户列表：', list);\n\n        // 按 id 查询单个用户\n        const one = await user.findOne({ _id: new ObjectId(result.insertedId) });\n        console.log('按 id 查询：', one);\n\n        // 更新用户\n        await user.updateOne(\n            { _id: new ObjectId(result.insertedId) },\n            { $set: { age: 23 } }\n        );\n\n        // 删除用户\n        await user.deleteOne({ _id: new ObjectId(result.insertedId) });\n    } finally {\n        await client.close();\n    }\n}\n\nmain();\n",[1574,2085,2086,2118,2122,2138,2154,2158,2170,2176,2190,2230,2234,2239,2263,2281,2294,2310,2319,2349,2353,2358,2387,2413,2418,2424,2476,2502,2507,2513,2528,2555,2581,2589,2594,2600,2640,2649,2664,2669,2674,2679],{"__ignoreMap":1572},[1577,2087,2088,2090,2092,2094,2097,2100,2102,2104,2106,2108,2110,2112,2114,2116],{"class":1579,"line":1580},[1577,2089,1715],{"class":1714},[1577,2091,1718],{"class":1591},[1577,2093,1790],{"class":1721},[1577,2095,2096],{"class":1591},",",[1577,2098,2099],{"class":1721}," ObjectId ",[1577,2101,1725],{"class":1591},[1577,2103,1728],{"class":1591},[1577,2105,1731],{"class":1595},[1577,2107,1734],{"class":1721},[1577,2109,1737],{"class":1591},[1577,2111,1740],{"class":1587},[1577,2113,1737],{"class":1591},[1577,2115,1745],{"class":1721},[1577,2117,1748],{"class":1591},[1577,2119,2120],{"class":1579,"line":1602},[1577,2121,1754],{"emptyLinePlaceholder":1753},[1577,2123,2124,2126,2128,2130,2132,2134,2136],{"class":1579,"line":1614},[1577,2125,1715],{"class":1714},[1577,2127,1761],{"class":1721},[1577,2129,1764],{"class":1591},[1577,2131,1767],{"class":1591},[1577,2133,1770],{"class":1587},[1577,2135,1737],{"class":1591},[1577,2137,1748],{"class":1591},[1577,2139,2140,2142,2144,2146,2148,2150,2152],{"class":1579,"line":1777},[1577,2141,1715],{"class":1714},[1577,2143,1782],{"class":1721},[1577,2145,1764],{"class":1591},[1577,2147,1787],{"class":1591},[1577,2149,1790],{"class":1595},[1577,2151,1793],{"class":1721},[1577,2153,1748],{"class":1591},[1577,2155,2156],{"class":1579,"line":1798},[1577,2157,1754],{"emptyLinePlaceholder":1753},[1577,2159,2160,2162,2164,2166,2168],{"class":1579,"line":1803},[1577,2161,1806],{"class":1714},[1577,2163,1809],{"class":1714},[1577,2165,1812],{"class":1595},[1577,2167,1815],{"class":1591},[1577,2169,1818],{"class":1591},[1577,2171,2172,2174],{"class":1579,"line":1821},[1577,2173,1825],{"class":1824},[1577,2175,1818],{"class":1591},[1577,2177,2178,2180,2182,2184,2186,2188],{"class":1579,"line":1830},[1577,2179,1833],{"class":1824},[1577,2181,1836],{"class":1721},[1577,2183,1839],{"class":1591},[1577,2185,1842],{"class":1595},[1577,2187,1815],{"class":1845},[1577,2189,1748],{"class":1591},[1577,2191,2192,2194,2196,2198,2200,2202,2204,2206,2208,2210,2212,2214,2216,2218,2220,2222,2224,2226,2228],{"class":1579,"line":1850},[1577,2193,1882],{"class":1714},[1577,2195,1914],{"class":1721},[1577,2197,1728],{"class":1591},[1577,2199,1836],{"class":1721},[1577,2201,1839],{"class":1591},[1577,2203,1894],{"class":1595},[1577,2205,1734],{"class":1845},[1577,2207,1737],{"class":1591},[1577,2209,1658],{"class":1587},[1577,2211,1737],{"class":1591},[1577,2213,1745],{"class":1845},[1577,2215,1839],{"class":1591},[1577,2217,1923],{"class":1595},[1577,2219,1734],{"class":1845},[1577,2221,1737],{"class":1591},[1577,2223,1662],{"class":1587},[1577,2225,1737],{"class":1591},[1577,2227,1745],{"class":1845},[1577,2229,1748],{"class":1591},[1577,2231,2232],{"class":1579,"line":1874},[1577,2233,1754],{"emptyLinePlaceholder":1753},[1577,2235,2236],{"class":1579,"line":1879},[1577,2237,2238],{"class":1946},"        // 新增用户\n",[1577,2240,2241,2243,2246,2248,2251,2253,2255,2258,2260],{"class":1579,"line":1909},[1577,2242,1882],{"class":1714},[1577,2244,2245],{"class":1721}," result",[1577,2247,1728],{"class":1591},[1577,2249,2250],{"class":1824}," await",[1577,2252,1914],{"class":1721},[1577,2254,1839],{"class":1591},[1577,2256,2257],{"class":1595},"insertOne",[1577,2259,1734],{"class":1845},[1577,2261,2262],{"class":1591},"{\n",[1577,2264,2265,2268,2271,2273,2276,2278],{"class":1579,"line":1938},[1577,2266,2267],{"class":1845},"            username",[1577,2269,2270],{"class":1591},":",[1577,2272,1767],{"class":1591},[1577,2274,2275],{"class":1587},"小美",[1577,2277,1737],{"class":1591},[1577,2279,2280],{"class":1591},",\n",[1577,2282,2283,2286,2288,2292],{"class":1579,"line":1943},[1577,2284,2285],{"class":1845},"            age",[1577,2287,2270],{"class":1591},[1577,2289,2291],{"class":2290},"smPcV"," 22",[1577,2293,2280],{"class":1591},[1577,2295,2296,2299,2301,2303,2306,2308],{"class":1579,"line":1950},[1577,2297,2298],{"class":1845},"            city",[1577,2300,2270],{"class":1591},[1577,2302,1767],{"class":1591},[1577,2304,2305],{"class":1587},"深圳",[1577,2307,1737],{"class":1591},[1577,2309,2280],{"class":1591},[1577,2311,2312,2315,2317],{"class":1579,"line":1961},[1577,2313,2314],{"class":1591},"        }",[1577,2316,1745],{"class":1845},[1577,2318,1748],{"class":1591},[1577,2320,2321,2323,2325,2327,2329,2331,2334,2336,2338,2340,2342,2345,2347],{"class":1579,"line":1977},[1577,2322,1853],{"class":1721},[1577,2324,1839],{"class":1591},[1577,2326,1858],{"class":1595},[1577,2328,1734],{"class":1845},[1577,2330,1737],{"class":1591},[1577,2332,2333],{"class":1587},"新增成功，_id =",[1577,2335,1737],{"class":1591},[1577,2337,2096],{"class":1591},[1577,2339,2245],{"class":1721},[1577,2341,1839],{"class":1591},[1577,2343,2344],{"class":1721},"insertedId",[1577,2346,1745],{"class":1845},[1577,2348,1748],{"class":1591},[1577,2350,2351],{"class":1579,"line":1983},[1577,2352,1754],{"emptyLinePlaceholder":1753},[1577,2354,2355],{"class":1579,"line":1989},[1577,2356,2357],{"class":1946},"        // 查询用户列表\n",[1577,2359,2360,2362,2365,2367,2369,2371,2373,2376,2378,2380,2383,2385],{"class":1579,"line":1994},[1577,2361,1882],{"class":1714},[1577,2363,2364],{"class":1721}," list",[1577,2366,1728],{"class":1591},[1577,2368,2250],{"class":1824},[1577,2370,1914],{"class":1721},[1577,2372,1839],{"class":1591},[1577,2374,2375],{"class":1595},"find",[1577,2377,1815],{"class":1845},[1577,2379,1839],{"class":1591},[1577,2381,2382],{"class":1595},"toArray",[1577,2384,1815],{"class":1845},[1577,2386,1748],{"class":1591},[1577,2388,2390,2392,2394,2396,2398,2400,2403,2405,2407,2409,2411],{"class":1579,"line":2389},21,[1577,2391,1853],{"class":1721},[1577,2393,1839],{"class":1591},[1577,2395,1858],{"class":1595},[1577,2397,1734],{"class":1845},[1577,2399,1737],{"class":1591},[1577,2401,2402],{"class":1587},"用户列表：",[1577,2404,1737],{"class":1591},[1577,2406,2096],{"class":1591},[1577,2408,2364],{"class":1721},[1577,2410,1745],{"class":1845},[1577,2412,1748],{"class":1591},[1577,2414,2416],{"class":1579,"line":2415},22,[1577,2417,1754],{"emptyLinePlaceholder":1753},[1577,2419,2421],{"class":1579,"line":2420},23,[1577,2422,2423],{"class":1946},"        // 按 id 查询单个用户\n",[1577,2425,2427,2429,2432,2434,2436,2438,2440,2443,2445,2448,2451,2453,2455,2458,2460,2463,2465,2467,2470,2472,2474],{"class":1579,"line":2426},24,[1577,2428,1882],{"class":1714},[1577,2430,2431],{"class":1721}," one",[1577,2433,1728],{"class":1591},[1577,2435,2250],{"class":1824},[1577,2437,1914],{"class":1721},[1577,2439,1839],{"class":1591},[1577,2441,2442],{"class":1595},"findOne",[1577,2444,1734],{"class":1845},[1577,2446,2447],{"class":1591},"{",[1577,2449,2450],{"class":1845}," _id",[1577,2452,2270],{"class":1591},[1577,2454,1787],{"class":1591},[1577,2456,2457],{"class":1595}," ObjectId",[1577,2459,1734],{"class":1845},[1577,2461,2462],{"class":1721},"result",[1577,2464,1839],{"class":1591},[1577,2466,2344],{"class":1721},[1577,2468,2469],{"class":1845},") ",[1577,2471,1725],{"class":1591},[1577,2473,1745],{"class":1845},[1577,2475,1748],{"class":1591},[1577,2477,2479,2481,2483,2485,2487,2489,2492,2494,2496,2498,2500],{"class":1579,"line":2478},25,[1577,2480,1853],{"class":1721},[1577,2482,1839],{"class":1591},[1577,2484,1858],{"class":1595},[1577,2486,1734],{"class":1845},[1577,2488,1737],{"class":1591},[1577,2490,2491],{"class":1587},"按 id 查询：",[1577,2493,1737],{"class":1591},[1577,2495,2096],{"class":1591},[1577,2497,2431],{"class":1721},[1577,2499,1745],{"class":1845},[1577,2501,1748],{"class":1591},[1577,2503,2505],{"class":1579,"line":2504},26,[1577,2506,1754],{"emptyLinePlaceholder":1753},[1577,2508,2510],{"class":1579,"line":2509},27,[1577,2511,2512],{"class":1946},"        // 更新用户\n",[1577,2514,2516,2518,2520,2522,2525],{"class":1579,"line":2515},28,[1577,2517,1833],{"class":1824},[1577,2519,1914],{"class":1721},[1577,2521,1839],{"class":1591},[1577,2523,2524],{"class":1595},"updateOne",[1577,2526,2527],{"class":1845},"(\n",[1577,2529,2531,2534,2536,2538,2540,2542,2544,2546,2548,2550,2552],{"class":1579,"line":2530},29,[1577,2532,2533],{"class":1591},"            {",[1577,2535,2450],{"class":1845},[1577,2537,2270],{"class":1591},[1577,2539,1787],{"class":1591},[1577,2541,2457],{"class":1595},[1577,2543,1734],{"class":1845},[1577,2545,2462],{"class":1721},[1577,2547,1839],{"class":1591},[1577,2549,2344],{"class":1721},[1577,2551,2469],{"class":1845},[1577,2553,2554],{"class":1591},"},\n",[1577,2556,2558,2560,2563,2565,2567,2570,2572,2575,2578],{"class":1579,"line":2557},30,[1577,2559,2533],{"class":1591},[1577,2561,2562],{"class":1845}," $set",[1577,2564,2270],{"class":1591},[1577,2566,1718],{"class":1591},[1577,2568,2569],{"class":1845}," age",[1577,2571,2270],{"class":1591},[1577,2573,2574],{"class":2290}," 23",[1577,2576,2577],{"class":1591}," }",[1577,2579,2580],{"class":1591}," }\n",[1577,2582,2584,2587],{"class":1579,"line":2583},31,[1577,2585,2586],{"class":1845},"        )",[1577,2588,1748],{"class":1591},[1577,2590,2592],{"class":1579,"line":2591},32,[1577,2593,1754],{"emptyLinePlaceholder":1753},[1577,2595,2597],{"class":1579,"line":2596},33,[1577,2598,2599],{"class":1946},"        // 删除用户\n",[1577,2601,2603,2605,2607,2609,2612,2614,2616,2618,2620,2622,2624,2626,2628,2630,2632,2634,2636,2638],{"class":1579,"line":2602},34,[1577,2604,1833],{"class":1824},[1577,2606,1914],{"class":1721},[1577,2608,1839],{"class":1591},[1577,2610,2611],{"class":1595},"deleteOne",[1577,2613,1734],{"class":1845},[1577,2615,2447],{"class":1591},[1577,2617,2450],{"class":1845},[1577,2619,2270],{"class":1591},[1577,2621,1787],{"class":1591},[1577,2623,2457],{"class":1595},[1577,2625,1734],{"class":1845},[1577,2627,2462],{"class":1721},[1577,2629,1839],{"class":1591},[1577,2631,2344],{"class":1721},[1577,2633,2469],{"class":1845},[1577,2635,1725],{"class":1591},[1577,2637,1745],{"class":1845},[1577,2639,1748],{"class":1591},[1577,2641,2643,2645,2647],{"class":1579,"line":2642},35,[1577,2644,1953],{"class":1591},[1577,2646,1956],{"class":1824},[1577,2648,1818],{"class":1591},[1577,2650,2652,2654,2656,2658,2660,2662],{"class":1579,"line":2651},36,[1577,2653,1833],{"class":1824},[1577,2655,1836],{"class":1721},[1577,2657,1839],{"class":1591},[1577,2659,1970],{"class":1595},[1577,2661,1815],{"class":1845},[1577,2663,1748],{"class":1591},[1577,2665,2667],{"class":1579,"line":2666},37,[1577,2668,1980],{"class":1591},[1577,2670,2672],{"class":1579,"line":2671},38,[1577,2673,1986],{"class":1591},[1577,2675,2677],{"class":1579,"line":2676},39,[1577,2678,1754],{"emptyLinePlaceholder":1753},[1577,2680,2682,2684,2686],{"class":1579,"line":2681},40,[1577,2683,1997],{"class":1595},[1577,2685,1815],{"class":1721},[1577,2687,1748],{"class":1591},[1531,2689,2690,2691,2694],{},"运行 ",[1574,2692,2693],{},"node crud.js","，就能看到新增、查询、更新、删除依次生效。",[1651,2696,2697],{},[1531,2698,2699,2700,2703,2704,2707,2708,2710,2711,1645,2713,2716],{},"注意 ",[1574,2701,2702],{},"ObjectId"," 的用法：MongoDB 的 ",[1574,2705,2706],{},"_id"," 不是普通字符串，而是一个特殊的对象类型。从 ",[1574,2709,1740],{}," 包里引入 ",[1574,2712,2702],{},[1574,2714,2715],{},"new ObjectId(id字符串)"," 包一层才能按 id 查询，直接传字符串是查不到的。这是新手很容易踩的坑。",[1543,2718],{},[1526,2720,2722],{"id":2721},"结合-express-写一个接口","💡 结合 Express 写一个接口",[1531,2724,2725,2726,2729,2730,2733],{},"最后把知识串起来，写一个简洁的 Express 接口：访问 ",[1574,2727,2728],{},"GET /users"," 返回用户列表。Express 基于 ",[1538,2731,2732],{},"5.x"," 版本，先安装：",[1567,2735,2737],{"className":1569,"code":2736,"language":1571,"meta":1572,"style":1572},"npm install express\n",[1574,2738,2739],{"__ignoreMap":1572},[1577,2740,2741,2743,2745],{"class":1579,"line":1580},[1577,2742,1605],{"class":1583},[1577,2744,1619],{"class":1587},[1577,2746,2747],{"class":1587}," express\n",[1567,2749,2752],{"className":1704,"code":2750,"filename":2751,"language":1707,"meta":1572,"style":1572},"const express = require('express');\nconst { MongoClient } = require('mongodb');\n\nconst url = 'mongodb://root:123456@localhost:27017';\nconst client = new MongoClient(url);\n\nconst app = express();\n\napp.get('/users', async (req, res) => {\n    const user = client.db('blog_demo').collection('user');\n    const list = await user.find().toArray();\n    res.json(list);\n});\n\nasync function main() {\n    await client.connect();\n\n    app.listen(3000, () => {\n        console.log('服务已启动：http://localhost:3000');\n    });\n}\n\nmain();\n","server.js",[1574,2753,2754,2778,2804,2808,2824,2840,2844,2860,2864,2907,2948,2974,2993,3001,3005,3017,3032,3036,3060,3081,3089,3093,3097],{"__ignoreMap":1572},[1577,2755,2756,2758,2761,2763,2765,2767,2769,2772,2774,2776],{"class":1579,"line":1580},[1577,2757,1715],{"class":1714},[1577,2759,2760],{"class":1721}," express ",[1577,2762,1764],{"class":1591},[1577,2764,1731],{"class":1595},[1577,2766,1734],{"class":1721},[1577,2768,1737],{"class":1591},[1577,2770,2771],{"class":1587},"express",[1577,2773,1737],{"class":1591},[1577,2775,1745],{"class":1721},[1577,2777,1748],{"class":1591},[1577,2779,2780,2782,2784,2786,2788,2790,2792,2794,2796,2798,2800,2802],{"class":1579,"line":1602},[1577,2781,1715],{"class":1714},[1577,2783,1718],{"class":1591},[1577,2785,1722],{"class":1721},[1577,2787,1725],{"class":1591},[1577,2789,1728],{"class":1591},[1577,2791,1731],{"class":1595},[1577,2793,1734],{"class":1721},[1577,2795,1737],{"class":1591},[1577,2797,1740],{"class":1587},[1577,2799,1737],{"class":1591},[1577,2801,1745],{"class":1721},[1577,2803,1748],{"class":1591},[1577,2805,2806],{"class":1579,"line":1614},[1577,2807,1754],{"emptyLinePlaceholder":1753},[1577,2809,2810,2812,2814,2816,2818,2820,2822],{"class":1579,"line":1777},[1577,2811,1715],{"class":1714},[1577,2813,1761],{"class":1721},[1577,2815,1764],{"class":1591},[1577,2817,1767],{"class":1591},[1577,2819,1770],{"class":1587},[1577,2821,1737],{"class":1591},[1577,2823,1748],{"class":1591},[1577,2825,2826,2828,2830,2832,2834,2836,2838],{"class":1579,"line":1798},[1577,2827,1715],{"class":1714},[1577,2829,1782],{"class":1721},[1577,2831,1764],{"class":1591},[1577,2833,1787],{"class":1591},[1577,2835,1790],{"class":1595},[1577,2837,1793],{"class":1721},[1577,2839,1748],{"class":1591},[1577,2841,2842],{"class":1579,"line":1803},[1577,2843,1754],{"emptyLinePlaceholder":1753},[1577,2845,2846,2848,2851,2853,2856,2858],{"class":1579,"line":1821},[1577,2847,1715],{"class":1714},[1577,2849,2850],{"class":1721}," app ",[1577,2852,1764],{"class":1591},[1577,2854,2855],{"class":1595}," express",[1577,2857,1815],{"class":1721},[1577,2859,1748],{"class":1591},[1577,2861,2862],{"class":1579,"line":1830},[1577,2863,1754],{"emptyLinePlaceholder":1753},[1577,2865,2866,2869,2871,2874,2876,2878,2881,2883,2885,2888,2891,2895,2897,2900,2902,2905],{"class":1579,"line":1850},[1577,2867,2868],{"class":1721},"app",[1577,2870,1839],{"class":1591},[1577,2872,2873],{"class":1595},"get",[1577,2875,1734],{"class":1721},[1577,2877,1737],{"class":1591},[1577,2879,2880],{"class":1587},"/users",[1577,2882,1737],{"class":1591},[1577,2884,2096],{"class":1591},[1577,2886,2887],{"class":1714}," async",[1577,2889,2890],{"class":1591}," (",[1577,2892,2894],{"class":2893},"sK9QF","req",[1577,2896,2096],{"class":1591},[1577,2898,2899],{"class":2893}," res",[1577,2901,1745],{"class":1591},[1577,2903,2904],{"class":1714}," =>",[1577,2906,1818],{"class":1591},[1577,2908,2909,2912,2914,2916,2918,2920,2922,2924,2926,2928,2930,2932,2934,2936,2938,2940,2942,2944,2946],{"class":1579,"line":1874},[1577,2910,2911],{"class":1714},"    const",[1577,2913,1914],{"class":1721},[1577,2915,1728],{"class":1591},[1577,2917,1836],{"class":1721},[1577,2919,1839],{"class":1591},[1577,2921,1894],{"class":1595},[1577,2923,1734],{"class":1845},[1577,2925,1737],{"class":1591},[1577,2927,1658],{"class":1587},[1577,2929,1737],{"class":1591},[1577,2931,1745],{"class":1845},[1577,2933,1839],{"class":1591},[1577,2935,1923],{"class":1595},[1577,2937,1734],{"class":1845},[1577,2939,1737],{"class":1591},[1577,2941,1662],{"class":1587},[1577,2943,1737],{"class":1591},[1577,2945,1745],{"class":1845},[1577,2947,1748],{"class":1591},[1577,2949,2950,2952,2954,2956,2958,2960,2962,2964,2966,2968,2970,2972],{"class":1579,"line":1879},[1577,2951,2911],{"class":1714},[1577,2953,2364],{"class":1721},[1577,2955,1728],{"class":1591},[1577,2957,2250],{"class":1824},[1577,2959,1914],{"class":1721},[1577,2961,1839],{"class":1591},[1577,2963,2375],{"class":1595},[1577,2965,1815],{"class":1845},[1577,2967,1839],{"class":1591},[1577,2969,2382],{"class":1595},[1577,2971,1815],{"class":1845},[1577,2973,1748],{"class":1591},[1577,2975,2976,2979,2981,2984,2986,2989,2991],{"class":1579,"line":1909},[1577,2977,2978],{"class":1721},"    res",[1577,2980,1839],{"class":1591},[1577,2982,2983],{"class":1595},"json",[1577,2985,1734],{"class":1845},[1577,2987,2988],{"class":1721},"list",[1577,2990,1745],{"class":1845},[1577,2992,1748],{"class":1591},[1577,2994,2995,2997,2999],{"class":1579,"line":1938},[1577,2996,1725],{"class":1591},[1577,2998,1745],{"class":1721},[1577,3000,1748],{"class":1591},[1577,3002,3003],{"class":1579,"line":1943},[1577,3004,1754],{"emptyLinePlaceholder":1753},[1577,3006,3007,3009,3011,3013,3015],{"class":1579,"line":1950},[1577,3008,1806],{"class":1714},[1577,3010,1809],{"class":1714},[1577,3012,1812],{"class":1595},[1577,3014,1815],{"class":1591},[1577,3016,1818],{"class":1591},[1577,3018,3019,3022,3024,3026,3028,3030],{"class":1579,"line":1961},[1577,3020,3021],{"class":1824},"    await",[1577,3023,1836],{"class":1721},[1577,3025,1839],{"class":1591},[1577,3027,1842],{"class":1595},[1577,3029,1815],{"class":1845},[1577,3031,1748],{"class":1591},[1577,3033,3034],{"class":1579,"line":1977},[1577,3035,1754],{"emptyLinePlaceholder":1753},[1577,3037,3038,3041,3043,3046,3048,3051,3053,3056,3058],{"class":1579,"line":1983},[1577,3039,3040],{"class":1721},"    app",[1577,3042,1839],{"class":1591},[1577,3044,3045],{"class":1595},"listen",[1577,3047,1734],{"class":1845},[1577,3049,3050],{"class":2290},"3000",[1577,3052,2096],{"class":1591},[1577,3054,3055],{"class":1591}," ()",[1577,3057,2904],{"class":1714},[1577,3059,1818],{"class":1591},[1577,3061,3062,3064,3066,3068,3070,3072,3075,3077,3079],{"class":1579,"line":1989},[1577,3063,1853],{"class":1721},[1577,3065,1839],{"class":1591},[1577,3067,1858],{"class":1595},[1577,3069,1734],{"class":1845},[1577,3071,1737],{"class":1591},[1577,3073,3074],{"class":1587},"服务已启动：http://localhost:3000",[1577,3076,1737],{"class":1591},[1577,3078,1745],{"class":1845},[1577,3080,1748],{"class":1591},[1577,3082,3083,3085,3087],{"class":1579,"line":1994},[1577,3084,1953],{"class":1591},[1577,3086,1745],{"class":1845},[1577,3088,1748],{"class":1591},[1577,3090,3091],{"class":1579,"line":2389},[1577,3092,1986],{"class":1591},[1577,3094,3095],{"class":1579,"line":2415},[1577,3096,1754],{"emptyLinePlaceholder":1753},[1577,3098,3099,3101,3103],{"class":1579,"line":2420},[1577,3100,1997],{"class":1595},[1577,3102,1815],{"class":1721},[1577,3104,1748],{"class":1591},[1531,3106,3107],{},"和一次性脚本不同，服务是长期运行的，所以我们只在启动时连接一次数据库，之后每个请求都复用这个连接，不需要每次请求都 connect 和 close。",[1531,3109,2690,3110,3113,3114,3117],{},[1574,3111,3112],{},"node server.js","，浏览器访问 ",[1574,3115,3116],{},"http://localhost:3000/users","，就能看到 JSON 格式的用户列表。到这里，浏览器、Node.js、MongoDB 这条完整链路就打通了。",[1543,3119],{},[1526,3121,3123],{"id":3122},"小节总结","🧾 小节总结",[2006,3125,3126,3133,3148,3157,3186,3195],{},[2009,3127,3128,3129,3132],{},"mongodb 是官方 Node.js 驱动，连接串格式为 ",[1574,3130,3131],{},"mongodb://账号:密码@地址:端口","。",[2009,3134,3135,3136,3138,3139,3141,3142,3144,3145,3147],{},"用 ",[1574,3137,2013],{}," 创建客户端，",[1574,3140,2019],{}," 建立连接，",[1574,3143,2035],{}," 保证 ",[1574,3146,2039],{}," 一定执行。",[2009,3149,3150,3151,3153,3154,3156],{},"通过 ",[1574,3152,2025],{}," 选数据库、",[1574,3155,2029],{}," 选集合，拿到集合后即可操作。",[2009,3158,3159,3161,3162,3165,3166,3168,3169,3172,3173,3175,3176,3178,3179,3182,3183,3185],{},[1574,3160,2257],{}," 新增后用 ",[1574,3163,3164],{},"result.insertedId"," 拿新文档的 ",[1574,3167,2706],{},"；",[1574,3170,3171],{},"find().toArray()"," 查列表；",[1574,3174,2442],{}," 查单个；",[1574,3177,2524],{}," 配合 ",[1574,3180,3181],{},"$set"," 更新；",[1574,3184,2611],{}," 删除。",[2009,3187,3188,3190,3191,3194],{},[1574,3189,2706],{}," 是 ObjectId 类型，按 id 查询要用 ",[1574,3192,3193],{},"new ObjectId(id)"," 转换，不能直接传字符串。",[2009,3196,3197],{},"Express 服务在启动时连接一次数据库，各请求复用连接，不要每次请求都重新连接。",[1543,3199],{},[1526,3201,3203],{"id":3202},"知识问答","❓ 知识问答",[1531,3205,3206],{},[1538,3207,3208],{},"Q1：为什么脚本报错说连接被拒绝？",[1531,3210,3211,3212,3214,3215,3218],{},"先检查 ",[1574,3213,1644],{}," 容器是否在运行（",[1574,3216,3217],{},"docker ps","），再确认连接串里的账号、密码、端口和启动容器时设置的一致。容器没启动或密码写错都会导致连接失败。",[1531,3220,3221],{},[1538,3222,3223,3224,3227,3228,3231],{},"Q2：",[1574,3225,3226],{},"client.db()"," 和 ",[1574,3229,3230],{},"db.collection()"," 会访问数据库吗？",[1531,3233,3234,3235,1561,3238,1561,3241,3244],{},"不会。这两步只是拿到操作入口，真正的网络请求发生在 ",[1574,3236,3237],{},"connect()",[1574,3239,3240],{},"find()",[1574,3242,3243],{},"insertOne()"," 这些操作上。所以即使数据库或集合还不存在，这两行也不会报错。",[1531,3246,3247],{},[1538,3248,3249,3250,3252],{},"Q3：为什么用字符串形式的 ",[1574,3251,2706],{}," 查询返回 null？",[1531,3254,3255,3256,3258,3259,3261,3262,3264,3265,3132],{},"MongoDB 的 ",[1574,3257,2706],{}," 是 ObjectId 类型，和字符串不相等。要从 ",[1574,3260,1740],{}," 包引入 ",[1574,3263,2702],{},"，写成 ",[1574,3266,3267],{},"findOne({ _id: new ObjectId(id) })",[1531,3269,3270],{},[1538,3271,3272,3273,3275],{},"Q4：每次操作完都要调用 ",[1574,3274,2039],{}," 吗？",[1531,3277,3278],{},"一次性脚本需要，否则进程不会退出。Express 这类长期运行的服务则相反，只在启动时连接一次并持续复用，进程关闭时才需要关闭连接。",[1531,3280,3281],{},[1538,3282,3283],{},"Q5：密码写在代码里有什么风险？",[1531,3285,3286,3287,3289,3290,3293],{},"代码一旦提交到 Git 仓库或被他人看到，数据库密码就泄露了。真实项目要用环境变量管理，并确保 ",[1574,3288,2062],{}," 文件在 ",[1574,3291,3292],{},".gitignore"," 中。",[1543,3295],{},[1526,3297,3299],{"id":3298},"小练习","🧪 小练习",[1531,3301,3302,3303,3306,3307,3132],{},"练习一：参照本文示例，写一个 ",[1574,3304,3305],{},"getUserByName"," 函数，接收用户名参数，返回对应的用户文档，查不到时返回 ",[1574,3308,3309],{},"null",[1567,3311,3313],{"className":1704,"code":3312,"filename":2079,"language":1707,"meta":1572,"style":1572},"const { MongoClient } = require('mongodb');\n\nconst url = 'mongodb://root:123456@localhost:27017';\nconst client = new MongoClient(url);\n\nasync function getUserByName(username) {\n    // 请在这里编写代码\n}\n",[1574,3314,3315,3341,3345,3361,3377,3381,3398,3403],{"__ignoreMap":1572},[1577,3316,3317,3319,3321,3323,3325,3327,3329,3331,3333,3335,3337,3339],{"class":1579,"line":1580},[1577,3318,1715],{"class":1714},[1577,3320,1718],{"class":1591},[1577,3322,1722],{"class":1721},[1577,3324,1725],{"class":1591},[1577,3326,1728],{"class":1591},[1577,3328,1731],{"class":1595},[1577,3330,1734],{"class":1721},[1577,3332,1737],{"class":1591},[1577,3334,1740],{"class":1587},[1577,3336,1737],{"class":1591},[1577,3338,1745],{"class":1721},[1577,3340,1748],{"class":1591},[1577,3342,3343],{"class":1579,"line":1602},[1577,3344,1754],{"emptyLinePlaceholder":1753},[1577,3346,3347,3349,3351,3353,3355,3357,3359],{"class":1579,"line":1614},[1577,3348,1715],{"class":1714},[1577,3350,1761],{"class":1721},[1577,3352,1764],{"class":1591},[1577,3354,1767],{"class":1591},[1577,3356,1770],{"class":1587},[1577,3358,1737],{"class":1591},[1577,3360,1748],{"class":1591},[1577,3362,3363,3365,3367,3369,3371,3373,3375],{"class":1579,"line":1777},[1577,3364,1715],{"class":1714},[1577,3366,1782],{"class":1721},[1577,3368,1764],{"class":1591},[1577,3370,1787],{"class":1591},[1577,3372,1790],{"class":1595},[1577,3374,1793],{"class":1721},[1577,3376,1748],{"class":1591},[1577,3378,3379],{"class":1579,"line":1798},[1577,3380,1754],{"emptyLinePlaceholder":1753},[1577,3382,3383,3385,3387,3390,3392,3394,3396],{"class":1579,"line":1803},[1577,3384,1806],{"class":1714},[1577,3386,1809],{"class":1714},[1577,3388,3389],{"class":1595}," getUserByName",[1577,3391,1734],{"class":1591},[1577,3393,1666],{"class":2893},[1577,3395,1745],{"class":1591},[1577,3397,1818],{"class":1591},[1577,3399,3400],{"class":1579,"line":1821},[1577,3401,3402],{"class":1946},"    // 请在这里编写代码\n",[1577,3404,3405],{"class":1579,"line":1830},[1577,3406,1986],{"class":1591},[1531,3408,3409,3410,3413],{},"练习二：给 Express 服务再加一个 ",[1574,3411,3412],{},"GET /users/:name"," 接口，根据路径中的用户名查询单个用户并返回 JSON。",[1567,3415,3417],{"className":1704,"code":3416,"filename":2751,"language":1707,"meta":1572,"style":1572},"app.get('/users/:name', async (req, res) => {\n    // 请在这里编写代码\n});\n",[1574,3418,3419,3454,3458],{"__ignoreMap":1572},[1577,3420,3421,3423,3425,3427,3429,3431,3434,3436,3438,3440,3442,3444,3446,3448,3450,3452],{"class":1579,"line":1580},[1577,3422,2868],{"class":1721},[1577,3424,1839],{"class":1591},[1577,3426,2873],{"class":1595},[1577,3428,1734],{"class":1721},[1577,3430,1737],{"class":1591},[1577,3432,3433],{"class":1587},"/users/:name",[1577,3435,1737],{"class":1591},[1577,3437,2096],{"class":1591},[1577,3439,2887],{"class":1714},[1577,3441,2890],{"class":1591},[1577,3443,2894],{"class":2893},[1577,3445,2096],{"class":1591},[1577,3447,2899],{"class":2893},[1577,3449,1745],{"class":1591},[1577,3451,2904],{"class":1714},[1577,3453,1818],{"class":1591},[1577,3455,3456],{"class":1579,"line":1602},[1577,3457,3402],{"class":1946},[1577,3459,3460,3462,3464],{"class":1579,"line":1614},[1577,3461,1725],{"class":1591},[1577,3463,1745],{"class":1721},[1577,3465,1748],{"class":1591},[1543,3467],{},[1531,3469,3470],{},"🎉 恭喜你已经掌握在 Node.js 中操作 MongoDB 的技能啦！下一篇我们学习 Mongoose，它能给集合加上字段约束和校验，让数据操作更规范、更省心。",[3472,3473,3474],"style",{},"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 .s86vT, html code.shiki .s86vT{--shiki-light:#39ADB5;--shiki-default:#89DDFF;--shiki-dark:#89DDFF}html pre.shiki code .swgpB, html code.shiki .swgpB{--shiki-light:#6182B8;--shiki-default:#82AAFF;--shiki-dark:#82AAFF}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: 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