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admin\n","bash","",[1535,1589,1590],{"__ignoreMap":1587},[1591,1592,1595,1599,1603,1606,1609,1612,1615,1618,1621,1625,1628],"span",{"class":1593,"line":1594},"line",1,[1591,1596,1598],{"class":1597},"sYGMc","docker",[1591,1600,1602],{"class":1601},"sIEYB"," exec",[1591,1604,1605],{"class":1601}," -it",[1591,1607,1608],{"class":1601}," mongo-demo",[1591,1610,1611],{"class":1601}," mongosh",[1591,1613,1614],{"class":1601}," -u",[1591,1616,1617],{"class":1601}," root",[1591,1619,1620],{"class":1601}," -p",[1591,1622,1624],{"class":1623},"smPcV"," 123456",[1591,1626,1627],{"class":1601}," --authenticationDatabase",[1591,1629,1630],{"class":1601}," admin\n",[1531,1632,1633,1634,1636],{},"进入后切换到 ",[1535,1635,1537],{}," 数据库：",[1582,1638,1642],{"className":1639,"code":1640,"language":1641,"meta":1587,"style":1587},"language-js shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","use blog_demo;\n","js",[1535,1643,1644],{"__ignoreMap":1587},[1591,1645,1646,1650],{"class":1593,"line":1594},[1591,1647,1649],{"class":1648},"sndM8","use blog_demo",[1591,1651,1653],{"class":1652},"s86vT",";\n",[1531,1655,1656,1657,1660,1661,1663,1664,1667],{},"MySQL 里的条件查询写在 ",[1535,1658,1659],{},"WHERE"," 后面，MongoDB 则写在 ",[1535,1662,1545],{}," 的第一个参数里，而且条件本身是一个 ",[1551,1665,1666],{},"JavaScript 对象","。比如「精确匹配」就是把字段和值直接写进对象：",[1582,1669,1671],{"className":1639,"code":1670,"language":1641,"meta":1587,"style":1587},"db.user.find({ city: '北京' });\n",[1535,1672,1673],{"__ignoreMap":1587},[1591,1674,1675,1678,1681,1683,1685,1689,1692,1695,1699,1702,1705,1708,1711,1714,1717],{"class":1593,"line":1594},[1591,1676,1677],{"class":1648},"db",[1591,1679,1680],{"class":1652},".",[1591,1682,1541],{"class":1648},[1591,1684,1680],{"class":1652},[1591,1686,1688],{"class":1687},"swgpB","find",[1591,1690,1691],{"class":1648},"(",[1591,1693,1694],{"class":1652},"{",[1591,1696,1698],{"class":1697},"sd2Uz"," 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的用户\n",[1591,1742,1744,1746,1748,1750,1752,1754,1756,1758,1761,1763,1766,1769,1771,1774,1776,1778,1780],{"class":1593,"line":1743},2,[1591,1745,1677],{"class":1648},[1591,1747,1680],{"class":1652},[1591,1749,1541],{"class":1648},[1591,1751,1680],{"class":1652},[1591,1753,1688],{"class":1687},[1591,1755,1691],{"class":1648},[1591,1757,1694],{"class":1652},[1591,1759,1760],{"class":1697}," age",[1591,1762,1701],{"class":1652},[1591,1764,1765],{"class":1652}," {",[1591,1767,1768],{"class":1697}," $gt",[1591,1770,1701],{"class":1652},[1591,1772,1773],{"class":1623}," 25",[1591,1775,1713],{"class":1652},[1591,1777,1713],{"class":1652},[1591,1779,1716],{"class":1648},[1591,1781,1653],{"class":1652},[1531,1783,1784,1785,1788,1789,1792],{},"可以打个比喻：直接写 ",[1535,1786,1787],{},"age: 25"," 像是跟店员说「我要 25 号货架」；写 ",[1535,1790,1791],{},"age: { $gt: 25 }"," 像是递上一张小纸条，纸条上写着「25 号往后的货架都要」。外层对象告诉 MongoDB 查哪个字段，内层对象告诉它用什么规则匹配。",[1531,1794,1795],{},"常用的比较操作符有这几个：",[1797,1798,1799,1811],"table",{},[1800,1801,1802],"thead",{},[1803,1804,1805,1808],"tr",{},[1806,1807,1724],"th",{},[1806,1809,1810],{},"含义",[1812,1813,1814,1825,1835,1845,1855,1865],"tbody",{},[1803,1815,1816,1822],{},[1817,1818,1819],"td",{},[1535,1820,1821],{},"$gt",[1817,1823,1824],{},"大于（>）",[1803,1826,1827,1832],{},[1817,1828,1829],{},[1535,1830,1831],{},"$gte",[1817,1833,1834],{},"大于等于（>=）",[1803,1836,1837,1842],{},[1817,1838,1839],{},[1535,1840,1841],{},"$lt",[1817,1843,1844],{},"小于（\u003C）",[1803,1846,1847,1852],{},[1817,1848,1849],{},[1535,1850,1851],{},"$lte",[1817,1853,1854],{},"小于等于（\u003C=）",[1803,1856,1857,1862],{},[1817,1858,1859],{},[1535,1860,1861],{},"$ne",[1817,1863,1864],{},"不等于（!=）",[1803,1866,1867,1872],{},[1817,1868,1869],{},[1535,1870,1871],{},"$in",[1817,1873,1874],{},"在指定数组之内",[1531,1876,1877],{},"两个常用的操作符可以组合在同一个字段上，比如「年龄在 22 到 28 之间」：",[1582,1879,1881],{"className":1639,"code":1880,"language":1641,"meta":1587,"style":1587},"db.user.find({ age: { $gte: 22, $lte: 28 } });\n",[1535,1882,1883],{"__ignoreMap":1587},[1591,1884,1885,1887,1889,1891,1893,1895,1897,1899,1901,1903,1905,1908,1910,1913,1916,1919,1921,1924,1926,1928,1930],{"class":1593,"line":1594},[1591,1886,1677],{"class":1648},[1591,1888,1680],{"class":1652},[1591,1890,1541],{"class":1648},[1591,1892,1680],{"class":1652},[1591,1894,1688],{"class":1687},[1591,1896,1691],{"class":1648},[1591,1898,1694],{"class":1652},[1591,1900,1760],{"class":1697},[1591,1902,1701],{"class":1652},[1591,1904,1765],{"class":1652},[1591,1906,1907],{"class":1697}," $gte",[1591,1909,1701],{"class":1652},[1591,1911,1912],{"class":1623}," 22",[1591,1914,1915],{"class":1652},",",[1591,1917,1918],{"class":1697}," $lte",[1591,1920,1701],{"class":1652},[1591,1922,1923],{"class":1623}," 28",[1591,1925,1713],{"class":1652},[1591,1927,1713],{"class":1652},[1591,1929,1716],{"class":1648},[1591,1931,1653],{"class":1652},[1531,1933,1934,1936],{},[1535,1935,1871],{}," 表示「字段值在数组里的任意一个就算匹配」，比如查询北京或上海的用户：",[1582,1938,1940],{"className":1639,"code":1939,"language":1641,"meta":1587,"style":1587},"db.user.find({ city: { $in: ['北京', '上海'] } });\n",[1535,1941,1942],{"__ignoreMap":1587},[1591,1943,1944,1946,1948,1950,1952,1954,1956,1958,1960,1962,1964,1967,1969,1972,1974,1976,1978,1980,1982,1985,1987,1990,1993,1995,1997],{"class":1593,"line":1594},[1591,1945,1677],{"class":1648},[1591,1947,1680],{"class":1652},[1591,1949,1541],{"class":1648},[1591,1951,1680],{"class":1652},[1591,1953,1688],{"class":1687},[1591,1955,1691],{"class":1648},[1591,1957,1694],{"class":1652},[1591,1959,1698],{"class":1697},[1591,1961,1701],{"class":1652},[1591,1963,1765],{"class":1652},[1591,1965,1966],{"class":1697}," $in",[1591,1968,1701],{"class":1652},[1591,1970,1971],{"class":1648}," [",[1591,1973,1710],{"class":1652},[1591,1975,1707],{"class":1601},[1591,1977,1710],{"class":1652},[1591,1979,1915],{"class":1652},[1591,1981,1704],{"class":1652},[1591,1983,1984],{"class":1601},"上海",[1591,1986,1710],{"class":1652},[1591,1988,1989],{"class":1648},"] ",[1591,1991,1992],{"class":1652},"}",[1591,1994,1713],{"class":1652},[1591,1996,1716],{"class":1648},[1591,1998,1653],{"class":1652},[1531,2000,2001,2003],{},[1535,2002,1861],{}," 则反过来，比如查询「不在北京的用户」：",[1582,2005,2007],{"className":1639,"code":2006,"language":1641,"meta":1587,"style":1587},"db.user.find({ city: { $ne: '北京' } });\n",[1535,2008,2009],{"__ignoreMap":1587},[1591,2010,2011,2013,2015,2017,2019,2021,2023,2025,2027,2029,2031,2034,2036,2038,2040,2042,2044,2046,2048],{"class":1593,"line":1594},[1591,2012,1677],{"class":1648},[1591,2014,1680],{"class":1652},[1591,2016,1541],{"class":1648},[1591,2018,1680],{"class":1652},[1591,2020,1688],{"class":1687},[1591,2022,1691],{"class":1648},[1591,2024,1694],{"class":1652},[1591,2026,1698],{"class":1697},[1591,2028,1701],{"class":1652},[1591,2030,1765],{"class":1652},[1591,2032,2033],{"class":1697}," $ne",[1591,2035,1701],{"class":1652},[1591,2037,1704],{"class":1652},[1591,2039,1707],{"class":1601},[1591,2041,1710],{"class":1652},[1591,2043,1713],{"class":1652},[1591,2045,1713],{"class":1652},[1591,2047,1716],{"class":1648},[1591,2049,1653],{"class":1652},[1572,2051],{},[1526,2053,2055],{"id":2054},"逻辑操作符and-与-or","✨ 逻辑操作符：$and 与 $or",[1531,2057,2058],{},"一个字段的条件可以用内层对象组合，但「多个字段之间的与、或」就要用到逻辑操作符了。",[1531,2060,2061,2067],{},[1551,2062,2063,2066],{},[1535,2064,2065],{},"$and"," 表示所有条件同时成立","。它接收一个条件数组，比如查询「年龄大于 25 并且城市是深圳」：",[1582,2069,2071],{"className":1639,"code":2070,"language":1641,"meta":1587,"style":1587},"db.user.find({\n    $and: [{ age: { $gt: 25 } }, { city: '深圳' }],\n});\n",[1535,2072,2073,2090,2139],{"__ignoreMap":1587},[1591,2074,2075,2077,2079,2081,2083,2085,2087],{"class":1593,"line":1594},[1591,2076,1677],{"class":1648},[1591,2078,1680],{"class":1652},[1591,2080,1541],{"class":1648},[1591,2082,1680],{"class":1652},[1591,2084,1688],{"class":1687},[1591,2086,1691],{"class":1648},[1591,2088,2089],{"class":1652},"{\n",[1591,2091,2092,2095,2097,2099,2101,2103,2105,2107,2109,2111,2113,2115,2118,2120,2122,2124,2126,2129,2131,2133,2136],{"class":1593,"line":1743},[1591,2093,2094],{"class":1697},"    $and",[1591,2096,1701],{"class":1652},[1591,2098,1971],{"class":1648},[1591,2100,1694],{"class":1652},[1591,2102,1760],{"class":1697},[1591,2104,1701],{"class":1652},[1591,2106,1765],{"class":1652},[1591,2108,1768],{"class":1697},[1591,2110,1701],{"class":1652},[1591,2112,1773],{"class":1623},[1591,2114,1713],{"class":1652},[1591,2116,2117],{"class":1652}," },",[1591,2119,1765],{"class":1652},[1591,2121,1698],{"class":1697},[1591,2123,1701],{"class":1652},[1591,2125,1704],{"class":1652},[1591,2127,2128],{"class":1601},"深圳",[1591,2130,1710],{"class":1652},[1591,2132,1713],{"class":1652},[1591,2134,2135],{"class":1648},"]",[1591,2137,2138],{"class":1652},",\n",[1591,2140,2142,2144,2146],{"class":1593,"line":2141},3,[1591,2143,1992],{"class":1652},[1591,2145,1716],{"class":1648},[1591,2147,1653],{"class":1652},[2149,2150,2151],"tip",{},[1531,2152,2153,2154,2156,2157,2160,2161,2163],{},"其实 ",[1535,2155,2065],{}," 大部分时候可以省略：同一个条件对象里写多个字段，默认就是「并且」的关系。上面的查询写成 ",[1535,2158,2159],{},"{ age: { $gt: 25 }, city: '深圳' }"," 效果完全一样，日常更推荐这种简洁写法。",[1535,2162,2065],{}," 主要用于需要对同一字段写多个并列条件的少数场景。",[1531,2165,2166,2172],{},[1551,2167,2168,2171],{},[1535,2169,2170],{},"$or"," 表示任意一个条件成立即可","。比如查询「年龄小于 23，或者在上海的用户」：",[1582,2174,2176],{"className":1639,"code":2175,"language":1641,"meta":1587,"style":1587},"db.user.find({\n    $or: [{ age: { $lt: 23 } }, { city: '上海' }],\n});\n",[1535,2177,2178,2194,2241],{"__ignoreMap":1587},[1591,2179,2180,2182,2184,2186,2188,2190,2192],{"class":1593,"line":1594},[1591,2181,1677],{"class":1648},[1591,2183,1680],{"class":1652},[1591,2185,1541],{"class":1648},[1591,2187,1680],{"class":1652},[1591,2189,1688],{"class":1687},[1591,2191,1691],{"class":1648},[1591,2193,2089],{"class":1652},[1591,2195,2196,2199,2201,2203,2205,2207,2209,2211,2214,2216,2219,2221,2223,2225,2227,2229,2231,2233,2235,2237,2239],{"class":1593,"line":1743},[1591,2197,2198],{"class":1697},"    $or",[1591,2200,1701],{"class":1652},[1591,2202,1971],{"class":1648},[1591,2204,1694],{"class":1652},[1591,2206,1760],{"class":1697},[1591,2208,1701],{"class":1652},[1591,2210,1765],{"class":1652},[1591,2212,2213],{"class":1697}," $lt",[1591,2215,1701],{"class":1652},[1591,2217,2218],{"class":1623}," 23",[1591,2220,1713],{"class":1652},[1591,2222,2117],{"class":1652},[1591,2224,1765],{"class":1652},[1591,2226,1698],{"class":1697},[1591,2228,1701],{"class":1652},[1591,2230,1704],{"class":1652},[1591,2232,1984],{"class":1601},[1591,2234,1710],{"class":1652},[1591,2236,1713],{"class":1652},[1591,2238,2135],{"class":1648},[1591,2240,2138],{"class":1652},[1591,2242,2243,2245,2247],{"class":1593,"line":2141},[1591,2244,1992],{"class":1652},[1591,2246,1716],{"class":1648},[1591,2248,1653],{"class":1652},[1531,2250,2251,2252,2254,2255,2257,2258,2260,2261,2263],{},"注意对比一下：",[1535,2253,1871],{}," 是「同一个字段，匹配多个值」，",[1535,2256,2170],{}," 是「多个条件（可以是不同字段），满足一个即可」。查「北京或上海」用 ",[1535,2259,1871],{}," 更简洁；条件横跨不同字段时用 ",[1535,2262,2170],{},"。",[1572,2265],{},[1526,2267,2269],{"id":2268},"字段投影只返回需要的字段","💡 字段投影：只返回需要的字段",[1531,2271,2272,2274,2275,2278],{},[1535,2273,1545],{}," 默认把文档的",[1551,2276,2277],{},"所有字段","都返回。但接口往往只需要其中两三个字段，全都传回去既浪费网络流量，也可能泄露敏感信息（比如密码字段）。",[1531,2280,2281,2283,2284,2287,2288,2290],{},[1535,2282,1545],{}," 的",[1551,2285,2286],{},"第二个参数","专门用来控制返回哪些字段，这叫",[1551,2289,1561],{},"（Projection）：",[1582,2292,2294],{"className":1639,"code":2293,"language":1641,"meta":1587,"style":1587},"// 只返回 username 和 age\ndb.user.find({ age: { $gt: 25 } }, { username: 1, age: 1 });\n",[1535,2295,2296,2301],{"__ignoreMap":1587},[1591,2297,2298],{"class":1593,"line":1594},[1591,2299,2300],{"class":1739},"// 只返回 username 和 age\n",[1591,2302,2303,2305,2307,2309,2311,2313,2315,2317,2319,2321,2323,2325,2327,2329,2331,2333,2335,2338,2340,2343,2345,2347,2349,2351,2353,2355],{"class":1593,"line":1743},[1591,2304,1677],{"class":1648},[1591,2306,1680],{"class":1652},[1591,2308,1541],{"class":1648},[1591,2310,1680],{"class":1652},[1591,2312,1688],{"class":1687},[1591,2314,1691],{"class":1648},[1591,2316,1694],{"class":1652},[1591,2318,1760],{"class":1697},[1591,2320,1701],{"class":1652},[1591,2322,1765],{"class":1652},[1591,2324,1768],{"class":1697},[1591,2326,1701],{"class":1652},[1591,2328,1773],{"class":1623},[1591,2330,1713],{"class":1652},[1591,2332,2117],{"class":1652},[1591,2334,1765],{"class":1652},[1591,2336,2337],{"class":1697}," username",[1591,2339,1701],{"class":1652},[1591,2341,2342],{"class":1623}," 1",[1591,2344,1915],{"class":1652},[1591,2346,1760],{"class":1697},[1591,2348,1701],{"class":1652},[1591,2350,2342],{"class":1623},[1591,2352,1713],{"class":1652},[1591,2354,1716],{"class":1648},[1591,2356,1653],{"class":1652},[1531,2358,2359,2360,2363,2364,2367,2368,2371,2372,2375],{},"投影对象里写 ",[1535,2361,2362],{},"1"," 表示「我要这个字段」。执行后你会发现结果里多了一个 ",[1535,2365,2366],{},"_id","：它是 MongoDB 自动给每条文档生成的主键，",[1551,2369,2370],{},"默认总是返回","。如果不要它，需要显式写 ",[1535,2373,2374],{},"_id: 0"," 把它关掉：",[1582,2377,2379],{"className":1639,"code":2378,"language":1641,"meta":1587,"style":1587},"db.user.find({ age: { $gt: 25 } }, { username: 1, age: 1, _id: 0 });\n",[1535,2380,2381],{"__ignoreMap":1587},[1591,2382,2383,2385,2387,2389,2391,2393,2395,2397,2399,2401,2403,2405,2407,2409,2411,2413,2415,2417,2419,2421,2423,2425,2427,2429,2431,2434,2436,2439,2441,2443],{"class":1593,"line":1594},[1591,2384,1677],{"class":1648},[1591,2386,1680],{"class":1652},[1591,2388,1541],{"class":1648},[1591,2390,1680],{"class":1652},[1591,2392,1688],{"class":1687},[1591,2394,1691],{"class":1648},[1591,2396,1694],{"class":1652},[1591,2398,1760],{"class":1697},[1591,2400,1701],{"class":1652},[1591,2402,1765],{"class":1652},[1591,2404,1768],{"class":1697},[1591,2406,1701],{"class":1652},[1591,2408,1773],{"class":1623},[1591,2410,1713],{"class":1652},[1591,2412,2117],{"class":1652},[1591,2414,1765],{"class":1652},[1591,2416,2337],{"class":1697},[1591,2418,1701],{"class":1652},[1591,2420,2342],{"class":1623},[1591,2422,1915],{"class":1652},[1591,2424,1760],{"class":1697},[1591,2426,1701],{"class":1652},[1591,2428,2342],{"class":1623},[1591,2430,1915],{"class":1652},[1591,2432,2433],{"class":1697}," _id",[1591,2435,1701],{"class":1652},[1591,2437,2438],{"class":1623}," 0",[1591,2440,1713],{"class":1652},[1591,2442,1716],{"class":1648},[1591,2444,1653],{"class":1652},[2446,2447,2448],"warning",{},[1531,2449,2450,2451,2453,2454,2463,2464,2467,2468,2470],{},"投影有个容易踩的坑：除了 ",[1535,2452,2366],{},"，",[1551,2455,2456,2458,2459,2462],{},[1535,2457,2362],{},"（要）和 ",[1535,2460,2461],{},"0","（不要）不能混用","。写成 ",[1535,2465,2466],{},"{ username: 1, age: 0 }"," 会报错。要么统一写「我要哪些」，要么统一写「我不要哪些」，两种风格二选一，",[1535,2469,2366],{}," 是例外，可以随时单独关闭。",[1531,2472,2473],{},"可以打个比喻：投影就像去打印店复印证件，勾选「只要姓名和年龄」两项，店员就只印这两栏，其余内容不复印。",[1572,2475],{},[1526,2477,2479],{"id":2478},"排序与分页sortlimitskip","⚡ 排序与分页：sort、limit、skip",[1531,2481,2482,2483,2486,2487,2489,2490,2493],{},"查出来的数据往往还要排个序。",[1535,2484,2485],{},"sort()"," 接收一个对象，",[1535,2488,2362],{}," 表示升序（从小到大），",[1535,2491,2492],{},"-1"," 表示降序（从大到小）：",[1582,2495,2497],{"className":1639,"code":2496,"language":1641,"meta":1587,"style":1587},"// 按年龄从大到小排序\ndb.user.find().sort({ age: -1 });\n",[1535,2498,2499,2504],{"__ignoreMap":1587},[1591,2500,2501],{"class":1593,"line":1594},[1591,2502,2503],{"class":1739},"// 按年龄从大到小排序\n",[1591,2505,2506,2508,2510,2512,2514,2516,2519,2521,2524,2526,2528,2530,2532,2535,2537,2539,2541],{"class":1593,"line":1743},[1591,2507,1677],{"class":1648},[1591,2509,1680],{"class":1652},[1591,2511,1541],{"class":1648},[1591,2513,1680],{"class":1652},[1591,2515,1688],{"class":1687},[1591,2517,2518],{"class":1648},"()",[1591,2520,1680],{"class":1652},[1591,2522,2523],{"class":1687},"sort",[1591,2525,1691],{"class":1648},[1591,2527,1694],{"class":1652},[1591,2529,1760],{"class":1697},[1591,2531,1701],{"class":1652},[1591,2533,2534],{"class":1652}," -",[1591,2536,2362],{"class":1623},[1591,2538,1713],{"class":1652},[1591,2540,1716],{"class":1648},[1591,2542,1653],{"class":1652},[1531,2544,2545,2547,2548,2550],{},[1535,2546,2485],{}," 跟在 ",[1535,2549,1545],{}," 后面链式调用即可，也可以指定多个排序字段，先按前一个排、相同再按后一个排。",[1531,2552,2553,2554,2557,2558,2561,2562,2565,2566,2569],{},"分页则靠 ",[1535,2555,2556],{},"limit()"," 和 ",[1535,2559,2560],{},"skip()"," 这对组合：",[1535,2563,2564],{},"limit(n)"," 限制最多返回 n 条，",[1535,2567,2568],{},"skip(n)"," 跳过前 n 条。假设每页显示 2 条，取第 2 页就是「跳过前 2 条，再取 2 条」：",[1582,2571,2573],{"className":1639,"code":2572,"language":1641,"meta":1587,"style":1587},"// 每页 2 条，查询第 2 页（页码从 1 开始算）\ndb.user.find().sort({ age: -1 }).skip(2).limit(2);\n",[1535,2574,2575,2580],{"__ignoreMap":1587},[1591,2576,2577],{"class":1593,"line":1594},[1591,2578,2579],{"class":1739},"// 每页 2 条，查询第 2 页（页码从 1 开始算）\n",[1591,2581,2582,2584,2586,2588,2590,2592,2594,2596,2598,2600,2602,2604,2606,2608,2610,2612,2614,2616,2619,2621,2624,2626,2628,2631,2633,2635,2637],{"class":1593,"line":1743},[1591,2583,1677],{"class":1648},[1591,2585,1680],{"class":1652},[1591,2587,1541],{"class":1648},[1591,2589,1680],{"class":1652},[1591,2591,1688],{"class":1687},[1591,2593,2518],{"class":1648},[1591,2595,1680],{"class":1652},[1591,2597,2523],{"class":1687},[1591,2599,1691],{"class":1648},[1591,2601,1694],{"class":1652},[1591,2603,1760],{"class":1697},[1591,2605,1701],{"class":1652},[1591,2607,2534],{"class":1652},[1591,2609,2362],{"class":1623},[1591,2611,1713],{"class":1652},[1591,2613,1716],{"class":1648},[1591,2615,1680],{"class":1652},[1591,2617,2618],{"class":1687},"skip",[1591,2620,1691],{"class":1648},[1591,2622,2623],{"class":1623},"2",[1591,2625,1716],{"class":1648},[1591,2627,1680],{"class":1652},[1591,2629,2630],{"class":1687},"limit",[1591,2632,1691],{"class":1648},[1591,2634,2623],{"class":1623},[1591,2636,1716],{"class":1648},[1591,2638,1653],{"class":1652},[1531,2640,2641,2642,2644],{},"配合排序，这条查询会按年龄降序取第 2 页，也就是年龄较小的王五和赵六前面被跳过的两人之后的两条。写分页时建议总是带上 ",[1535,2643,2485],{},"，否则返回顺序不固定，翻页可能出现重复或漏数据。",[2149,2646,2647],{},[1531,2648,2649,2651,2652,2655,2656,2659],{},[1535,2650,2560],{}," 的原理是「先扫描再丢弃」，翻页越深要跳过的数据越多，速度就越慢。数据量变大后，常用做法是改用",[1551,2653,2654],{},"条件范围翻页","：记住上一页末尾的值（比如年龄），下一页用 ",[1535,2657,2658],{},"{ age: { $lt: 上一页末尾年龄 } }"," 接着查。知道有这回事即可，后续用到再深入。",[1572,2661],{},[1526,2663,2665],{"id":2664},"统计数量countdocuments","🛠 统计数量：countDocuments",[1531,2667,2668,2669,2672,2673,2675],{},"有时我们不需要数据本身，只想知道「有多少条」，比如列表页顶部的「共 N 位用户」。这时用 ",[1535,2670,2671],{},"countDocuments()","，参数和 ",[1535,2674,1545],{}," 的条件写法一样：",[1582,2677,2679],{"className":1639,"code":2678,"language":1641,"meta":1587,"style":1587},"// 统计北京的用户数量\ndb.user.countDocuments({ city: '北京' });\n",[1535,2680,2681,2686],{"__ignoreMap":1587},[1591,2682,2683],{"class":1593,"line":1594},[1591,2684,2685],{"class":1739},"// 统计北京的用户数量\n",[1591,2687,2688,2690,2692,2694,2696,2699,2701,2703,2705,2707,2709,2711,2713,2715,2717],{"class":1593,"line":1743},[1591,2689,1677],{"class":1648},[1591,2691,1680],{"class":1652},[1591,2693,1541],{"class":1648},[1591,2695,1680],{"class":1652},[1591,2697,2698],{"class":1687},"countDocuments",[1591,2700,1691],{"class":1648},[1591,2702,1694],{"class":1652},[1591,2704,1698],{"class":1697},[1591,2706,1701],{"class":1652},[1591,2708,1704],{"class":1652},[1591,2710,1707],{"class":1601},[1591,2712,1710],{"class":1652},[1591,2714,1713],{"class":1652},[1591,2716,1716],{"class":1648},[1591,2718,1653],{"class":1652},[1531,2720,2721,2722,2724,2725,2728],{},"返回 ",[1535,2723,2362],{},"。条件传空对象 ",[1535,2726,2727],{},"{}"," 就是统计集合里的全部文档：",[1582,2730,2732],{"className":1639,"code":2731,"language":1641,"meta":1587,"style":1587},"db.user.countDocuments({});\n",[1535,2733,2734],{"__ignoreMap":1587},[1591,2735,2736,2738,2740,2742,2744,2746,2748,2750,2752],{"class":1593,"line":1594},[1591,2737,1677],{"class":1648},[1591,2739,1680],{"class":1652},[1591,2741,1541],{"class":1648},[1591,2743,1680],{"class":1652},[1591,2745,2698],{"class":1687},[1591,2747,1691],{"class":1648},[1591,2749,2727],{"class":1652},[1591,2751,1716],{"class":1648},[1591,2753,1653],{"class":1652},[1572,2755],{},[1526,2757,2759],{"id":2758},"小节总结","🧾 小节总结",[2761,2762,2763,2783,2792,2814,2829],"ul",{},[2764,2765,2766,2767,2769,2770,2772,2773,2772,2775,2772,2777,2772,2779,2772,2781,2263],"li",{},"比较操作符以 ",[1535,2768,1728],{}," 开头，写成字段的内层对象：",[1535,2771,1821],{}," / ",[1535,2774,1831],{},[1535,2776,1841],{},[1535,2778,1851],{},[1535,2780,1861],{},[1535,2782,1871],{},[2764,2784,2785,2786,2789,2790,2263],{},"同字段多条件写在一个对象里，如 ",[1535,2787,2788],{},"{ $gte: 22, $lte: 28 }","；多字段默认是「并且」，跨字段「或者」用 ",[1535,2791,2170],{},[2764,2793,2794,2796,2797,2799,2800,2802,2803,2805,2806,2557,2808,2810,2811,2813],{},[1535,2795,1545],{}," 第二个参数做字段投影，写 ",[1535,2798,2362],{}," 表示返回该字段；",[1535,2801,2366],{}," 默认返回，显式设 ",[1535,2804,2461],{}," 才隐藏；",[1535,2807,2362],{},[1535,2809,2461],{}," 不能混用（",[1535,2812,2366],{}," 除外）。",[2764,2815,2816,2819,2820,2822,2823,2825,2826,2828],{},[1535,2817,2818],{},"sort({ age: -1 })"," 降序、",[1535,2821,2362],{}," 升序；",[1535,2824,2560],{}," + ",[1535,2827,2556],{}," 实现分页，翻页深时会变慢。",[2764,2830,2831,2834,2835,2837],{},[1535,2832,2833],{},"countDocuments(条件)"," 统计匹配的文档数量，传 ",[1535,2836,2727],{}," 统计全部。",[1572,2839],{},[1526,2841,2843],{"id":2842},"知识问答","❓ 知识问答",[1531,2845,2846],{},[1551,2847,2848,2849,2557,2852,2855],{},"Q1：",[1535,2850,2851],{},"{ city: '北京' }",[1535,2853,2854],{},"{ city: { $in: ['北京'] } }"," 有什么区别？",[1531,2857,2858,2859,2861,2862,2864,2865,2263],{},"对单个值来说两者效果一样，直接用等值写法 ",[1535,2860,2851],{}," 更简洁。",[1535,2863,1871],{}," 的价值在于一次匹配多个值，比如 ",[1535,2866,2867],{},"{ city: { $in: ['北京', '上海'] } }",[1531,2869,2870],{},[1551,2871,2872,2873,2876],{},"Q2：",[1535,2874,2875],{},"$gt: 25"," 会包含 25 岁的人吗？",[1531,2878,2879,2880,2882,2883,2885,2886,2888,2889,2263],{},"不会。",[1535,2881,1821],{}," 是严格大于，要包含 25 请用 ",[1535,2884,1831],{},"。同理 ",[1535,2887,1841],{}," 是严格小于，包含边界用 ",[1535,2890,1851],{},[1531,2892,2893],{},[1551,2894,2895,2896,2899,2900,2902],{},"Q3：为什么我的投影里写了 ",[1535,2897,2898],{},"username: 1","，结果还是有 ",[1535,2901,2366],{},"？",[1531,2904,2905,2907,2908,2910,2911,2263],{},[1535,2906,2366],{}," 是主键，默认总是返回，不受投影里 ",[1535,2909,2362],{}," 列表的影响。不想要它就显式写 ",[1535,2912,2374],{},[1531,2914,2915],{},[1551,2916,2917,2918,2921,2922,2925],{},"Q4：",[1535,2919,2920],{},"skip(0).limit(2)"," 和直接 ",[1535,2923,2924],{},"limit(2)"," 一样吗？",[1531,2927,2928,2929,2931],{},"一样，跳过 0 条等于不跳过。",[1535,2930,2560],{}," 只在翻到第 2 页及以后才真正发挥作用，第 1 页可以省略不写。",[1531,2933,2934],{},[1551,2935,2936,2937,2939],{},"Q5：分页查询不带 ",[1535,2938,2485],{}," 会有什么问题？",[1531,2941,2942],{},"不排序时文档的返回顺序不固定，翻页过程中可能出现同一条数据在多个页面重复出现，或者某些数据始终翻不到。分页前建议先确定排序字段。",[1572,2944],{},[1526,2946,2948],{"id":2947},"小练习","🧪 小练习",[1531,2950,2951,2952,2954],{},"在 ",[1535,2953,1541],{}," 集合中完成下面两步查询：",[2956,2957,2958],"ol",{},[2764,2959,2960,2961,2557,2964,2967,2968,2970],{},"查询年龄大于 23 且不在北京的用户，只返回 ",[1535,2962,2963],{},"username",[1535,2965,2966],{},"city"," 两个字段（不要 ",[1535,2969,2366],{},"）。",[1582,2972,2974],{"className":1639,"code":2973,"language":1641,"meta":1587,"style":1587},"// 请在这里编写代码\n",[1535,2975,2976],{"__ignoreMap":1587},[1591,2977,2978],{"class":1593,"line":1594},[1591,2979,2973],{"class":1739},[2956,2981,2982],{"start":1743},[2764,2983,2984],{},"按年龄从小到大排序，每页 2 条，查询第 2 页。",[1582,2986,2987],{"className":1639,"code":2973,"language":1641,"meta":1587,"style":1587},[1535,2988,2989],{"__ignoreMap":1587},[1591,2990,2991],{"class":1593,"line":1594},[1591,2992,2973],{"class":1739},[1572,2994],{},[1531,2996,2997],{},"🎉 恭喜你已经掌握条件查询与常用操作符的技能啦！下一篇我们聊聊文档与数据类型，看看 MongoDB 里的嵌套文档、数组这些灵活结构该怎么玩。",[2999,3000,3001],"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 .smPcV, html code.shiki .smPcV{--shiki-light:#F76D47;--shiki-default:#F78C6C;--shiki-dark:#F78C6C}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 .sndM8, html code.shiki .sndM8{--shiki-light:#90A4AE;--shiki-default:#EEFFFF;--shiki-dark:#BABED8}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 pre.shiki code .sd2Uz, html code.shiki .sd2Uz{--shiki-light:#E53935;--shiki-default:#F07178;--shiki-dark:#F07178}html pre.shiki code .syuKq, html code.shiki .syuKq{--shiki-light:#90A4AE;--shiki-light-font-style:italic;--shiki-default:#546E7A;--shiki-default-font-style:italic;--shiki-dark:#676E95;--shiki-dark-font-style:italic}",{"title":1587,"searchDepth":1743,"depth":1743,"links":3003},[3004,3005,3006,3007,3008,3009,3010,3011,3012],{"id":1528,"depth":1743,"text":1529},{"id":1576,"depth":1743,"text":1577},{"id":2054,"depth":1743,"text":2055},{"id":2268,"depth":1743,"text":2269},{"id":2478,"depth":1743,"text":2479},{"id":2664,"depth":1743,"text":2665},{"id":2758,"depth":1743,"text":2759},{"id":2842,"depth":1743,"text":2843},{"id":2947,"depth":1743,"text":2948},"掌握比较与逻辑操作符、字段投影、排序分页，从集合中精确找出想要的数据。","md",null,{},{"title":1323},{"title":1521,"description":3013},"zzwQ2riqeY",[3021,3023],{"title":1284,"path":1320,"stem":1321,"description":3022,"children":-1},"学会数据库与集合的概念，掌握 insertOne、find、updateOne、deleteOne 四种基本操作。",{"title":1327,"path":1328,"stem":1329,"description":3024,"children":-1},"理解 _id 与 ObjectId，掌握嵌套文档和数组的存取与查询，学会 MongoDB 的建模思路。",1784715109781]