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之后，我们把视角切回客户端：写查询不只是「挑字段」，实际开发中还要按条件查数据、复用查询语句、一次拿回互相关联的多层数据。",[1531,1535,1536,1537,1541,1542,1545,1546,1549,1550,1553],{},"学完这篇文章，你能熟练使用查询的四个常用技能：给字段传",[1538,1539,1540],"strong",{},"参数","、用",[1538,1543,1544],{},"变量","动态传值、用",[1538,1547,1548],{},"别名","重复查询同一字段，以及用",[1538,1551,1552],{},"嵌套查询","一次取回关联数据。这些技能覆盖了日常查询的大部分场景。",[1555,1556],"hr",{},[1526,1558,1560],{"id":1559},"字段参数","🧱 字段参数",[1531,1562,1563,1564,1568],{},"查询字段可以像函数一样接收参数。比如「按 id 查单个用户」，先在 Schema 的 ",[1565,1566,1567],"code",{},"Query"," 里声明参数：",[1570,1571,1576],"pre",{"className":1572,"code":1573,"language":1574,"meta":1575,"style":1575},"language-graphql shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","type Query {\n    users: [User!]!\n    user(id: ID!): User\n}\n","graphql","",[1565,1577,1578,1586,1592,1598],{"__ignoreMap":1575},[1579,1580,1583],"span",{"class":1581,"line":1582},"line",1,[1579,1584,1585],{},"type Query {\n",[1579,1587,1589],{"class":1581,"line":1588},2,[1579,1590,1591],{},"    users: [User!]!\n",[1579,1593,1595],{"class":1581,"line":1594},3,[1579,1596,1597],{},"    user(id: ID!): User\n",[1579,1599,1601],{"class":1581,"line":1600},4,[1579,1602,1603],{},"}\n",[1531,1605,1606,1609,1610,1613,1614,1617],{},[1565,1607,1608],{},"user(id: ID!)"," 表示这个查询必须传一个 ",[1565,1611,1612],{},"ID"," 类型的 ",[1565,1615,1616],{},"id"," 参数。客户端这样写：",[1570,1619,1621],{"className":1572,"code":1620,"language":1574,"meta":1575,"style":1575},"{\n    user(id: \"1\") {\n        username\n        age\n    }\n}\n",[1565,1622,1623,1628,1633,1638,1643,1649],{"__ignoreMap":1575},[1579,1624,1625],{"class":1581,"line":1582},[1579,1626,1627],{},"{\n",[1579,1629,1630],{"class":1581,"line":1588},[1579,1631,1632],{},"    user(id: \"1\") {\n",[1579,1634,1635],{"class":1581,"line":1594},[1579,1636,1637],{},"        username\n",[1579,1639,1640],{"class":1581,"line":1600},[1579,1641,1642],{},"        age\n",[1579,1644,1646],{"class":1581,"line":1645},5,[1579,1647,1648],{},"    }\n",[1579,1650,1652],{"class":1581,"line":1651},6,[1579,1653,1603],{},[1531,1655,1656,1657,1663],{},"服务端这边，参数通过 resolver 函数的",[1538,1658,1659,1660],{},"第二个参数 ",[1565,1661,1662],{},"args"," 拿到：",[1570,1665,1669],{"className":1666,"code":1667,"language":1668,"meta":1575,"style":1575},"language-js shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","const resolvers = {\n    Query: {\n        user: (parent, args) => users.find((item) => item.id === args.id),\n    },\n};\n","js",[1565,1670,1671,1688,1699,1768,1773],{"__ignoreMap":1575},[1579,1672,1673,1677,1681,1685],{"class":1581,"line":1582},[1579,1674,1676],{"class":1675},"s50WR","const",[1579,1678,1680],{"class":1679},"sndM8"," resolvers ",[1579,1682,1684],{"class":1683},"s86vT","=",[1579,1686,1687],{"class":1683}," {\n",[1579,1689,1690,1694,1697],{"class":1581,"line":1588},[1579,1691,1693],{"class":1692},"sd2Uz","    Query",[1579,1695,1696],{"class":1683},":",[1579,1698,1687],{"class":1683},[1579,1700,1701,1705,1707,1710,1714,1717,1720,1723,1726,1729,1732,1735,1738,1740,1743,1745,1747,1750,1752,1755,1758,1760,1762,1765],{"class":1581,"line":1594},[1579,1702,1704],{"class":1703},"swgpB","        user",[1579,1706,1696],{"class":1683},[1579,1708,1709],{"class":1683}," (",[1579,1711,1713],{"class":1712},"sK9QF","parent",[1579,1715,1716],{"class":1683},",",[1579,1718,1719],{"class":1712}," args",[1579,1721,1722],{"class":1683},")",[1579,1724,1725],{"class":1675}," =>",[1579,1727,1728],{"class":1679}," users",[1579,1730,1731],{"class":1683},".",[1579,1733,1734],{"class":1703},"find",[1579,1736,1737],{"class":1679},"(",[1579,1739,1737],{"class":1683},[1579,1741,1742],{"class":1712},"item",[1579,1744,1722],{"class":1683},[1579,1746,1725],{"class":1675},[1579,1748,1749],{"class":1679}," item",[1579,1751,1731],{"class":1683},[1579,1753,1754],{"class":1679},"id ",[1579,1756,1757],{"class":1683},"===",[1579,1759,1719],{"class":1679},[1579,1761,1731],{"class":1683},[1579,1763,1764],{"class":1679},"id)",[1579,1766,1767],{"class":1683},",\n",[1579,1769,1770],{"class":1581,"line":1600},[1579,1771,1772],{"class":1683},"    },\n",[1579,1774,1775],{"class":1581,"line":1645},[1579,1776,1777],{"class":1683},"};\n",[1531,1779,1780],{},"resolver 函数有固定的参数结构，常用的是前两个：",[1782,1783,1784,1790],"ul",{},[1785,1786,1787,1789],"li",{},[1565,1788,1713],{},"：上一层解析出来的数据，顶层查询用不到，嵌套时很关键，后面会看到。",[1785,1791,1792,1794],{},[1565,1793,1662],{},"：客户端传来的参数对象，客户端传了什么这里就有什么。",[1796,1797,1798],"tip",{},[1531,1799,1800,1801,1804],{},"参数的类型和是否必传（",[1565,1802,1803],{},"!","）都写在 Schema 里。客户端少传了必传参数，或者类型不对，执行前就会校验失败，不需要我们在 resolver 里手动检查。",[1555,1806],{},[1526,1808,1810],{"id":1809},"查询变量","✨ 查询变量",[1531,1812,1813,1814,1817],{},"上面的例子里，",[1565,1815,1816],{},"\"1\""," 是直接写死在查询语句里的。真实项目中 id 来自用户点击，是动态的，总不能每次拼字符串。GraphQL 为此提供了**变量（Variables）**机制：",[1570,1819,1821],{"className":1572,"code":1820,"language":1574,"meta":1575,"style":1575},"query GetUser($id: ID!) {\n    user(id: $id) {\n        username\n        age\n    }\n}\n",[1565,1822,1823,1828,1833,1837,1841,1845],{"__ignoreMap":1575},[1579,1824,1825],{"class":1581,"line":1582},[1579,1826,1827],{},"query GetUser($id: ID!) {\n",[1579,1829,1830],{"class":1581,"line":1588},[1579,1831,1832],{},"    user(id: $id) {\n",[1579,1834,1835],{"class":1581,"line":1594},[1579,1836,1637],{},[1579,1838,1839],{"class":1581,"line":1600},[1579,1840,1642],{},[1579,1842,1843],{"class":1581,"line":1645},[1579,1844,1648],{},[1579,1846,1847],{"class":1581,"line":1651},[1579,1848,1603],{},[1531,1850,1851],{},"几个新语法：",[1782,1853,1854,1864,1881],{},[1785,1855,1856,1859,1860,1863],{},[1565,1857,1858],{},"query GetUser","：给这次查询起个名字（操作名），",[1565,1861,1862],{},"GetUser"," 方便调试和日志排查。",[1785,1865,1866,1869,1870,1873,1874,1876,1877,1880],{},[1565,1867,1868],{},"($id: ID!)","：声明一个变量 ",[1565,1871,1872],{},"$id","，类型是 ",[1565,1875,1612],{}," 且必传。变量名以 ",[1565,1878,1879],{},"$"," 开头。",[1785,1882,1883,1886],{},[1565,1884,1885],{},"user(id: $id)","：在查询里使用这个变量。",[1531,1888,1889,1890,1893],{},"变量的值不写在查询语句里，而是作为",[1538,1891,1892],{},"独立的 JSON"," 一起发给服务端。在 Apollo Sandbox 左下角的 Variables 面板里填：",[1570,1895,1899],{"className":1896,"code":1897,"language":1898,"meta":1575,"style":1575},"language-json shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","{\n    \"id\": \"1\"\n}\n","json",[1565,1900,1901,1905,1927],{"__ignoreMap":1575},[1579,1902,1903],{"class":1581,"line":1582},[1579,1904,1627],{"class":1683},[1579,1906,1907,1910,1912,1915,1917,1920,1924],{"class":1581,"line":1588},[1579,1908,1909],{"class":1683},"    \"",[1579,1911,1616],{"class":1675},[1579,1913,1914],{"class":1683},"\"",[1579,1916,1696],{"class":1683},[1579,1918,1919],{"class":1683}," \"",[1579,1921,1923],{"class":1922},"sIEYB","1",[1579,1925,1926],{"class":1683},"\"\n",[1579,1928,1929],{"class":1581,"line":1594},[1579,1930,1603],{"class":1683},[1531,1932,1933],{},"这样做有两个明显的好处：查询语句本身可以固定下来复用，只有值在变；同时避免了拼字符串带来的转义问题，和 SQL 里用预编译参数防注入是同一个思路。",[1555,1935],{},[1526,1937,1939],{"id":1938},"别名一次查多份","⚡ 别名：一次查多份",[1531,1941,1942,1943,1946],{},"有时候想在一次请求里对比两个用户，直接写两遍 ",[1565,1944,1945],{},"user"," 会字段冲突：",[1570,1948,1950],{"className":1572,"code":1949,"language":1574,"meta":1575,"style":1575},"{\n    first: user(id: \"1\") {\n        username\n    }\n    second: user(id: \"2\") {\n        username\n    }\n}\n",[1565,1951,1952,1956,1961,1965,1969,1974,1978,1983],{"__ignoreMap":1575},[1579,1953,1954],{"class":1581,"line":1582},[1579,1955,1627],{},[1579,1957,1958],{"class":1581,"line":1588},[1579,1959,1960],{},"    first: user(id: \"1\") {\n",[1579,1962,1963],{"class":1581,"line":1594},[1579,1964,1637],{},[1579,1966,1967],{"class":1581,"line":1600},[1579,1968,1648],{},[1579,1970,1971],{"class":1581,"line":1645},[1579,1972,1973],{},"    second: user(id: \"2\") {\n",[1579,1975,1976],{"class":1581,"line":1651},[1579,1977,1637],{},[1579,1979,1981],{"class":1581,"line":1980},7,[1579,1982,1648],{},[1579,1984,1986],{"class":1581,"line":1985},8,[1579,1987,1603],{},[1531,1989,1990,1991,1994],{},"**别名（Alias）**的语法是 ",[1565,1992,1993],{},"别名: 原字段","，返回结果的键名也会变成别名：",[1570,1996,1998],{"className":1896,"code":1997,"language":1898,"meta":1575,"style":1575},"{\n    \"data\": {\n        \"first\": { \"username\": \"小明\" },\n        \"second\": { \"username\": \"小美\" }\n    }\n}\n",[1565,1999,2000,2004,2017,2053,2084,2088],{"__ignoreMap":1575},[1579,2001,2002],{"class":1581,"line":1582},[1579,2003,1627],{"class":1683},[1579,2005,2006,2008,2011,2013,2015],{"class":1581,"line":1588},[1579,2007,1909],{"class":1683},[1579,2009,2010],{"class":1675},"data",[1579,2012,1914],{"class":1683},[1579,2014,1696],{"class":1683},[1579,2016,1687],{"class":1683},[1579,2018,2019,2022,2026,2028,2030,2033,2035,2039,2041,2043,2045,2048,2050],{"class":1581,"line":1594},[1579,2020,2021],{"class":1683},"        \"",[1579,2023,2025],{"class":2024},"sYGMc","first",[1579,2027,1914],{"class":1683},[1579,2029,1696],{"class":1683},[1579,2031,2032],{"class":1683}," {",[1579,2034,1919],{"class":1683},[1579,2036,2038],{"class":2037},"smPcV","username",[1579,2040,1914],{"class":1683},[1579,2042,1696],{"class":1683},[1579,2044,1919],{"class":1683},[1579,2046,2047],{"class":1922},"小明",[1579,2049,1914],{"class":1683},[1579,2051,2052],{"class":1683}," },\n",[1579,2054,2055,2057,2060,2062,2064,2066,2068,2070,2072,2074,2076,2079,2081],{"class":1581,"line":1600},[1579,2056,2021],{"class":1683},[1579,2058,2059],{"class":2024},"second",[1579,2061,1914],{"class":1683},[1579,2063,1696],{"class":1683},[1579,2065,2032],{"class":1683},[1579,2067,1919],{"class":1683},[1579,2069,2038],{"class":2037},[1579,2071,1914],{"class":1683},[1579,2073,1696],{"class":1683},[1579,2075,1919],{"class":1683},[1579,2077,2078],{"class":1922},"小美",[1579,2080,1914],{"class":1683},[1579,2082,2083],{"class":1683}," }\n",[1579,2085,2086],{"class":1581,"line":1645},[1579,2087,1648],{"class":1683},[1579,2089,2090],{"class":1581,"line":1651},[1579,2091,1603],{"class":1683},[1531,2093,2094],{},"别名不光用于带参数字段，任何字段重名冲突时都可以用它解决，是查询里很顺手的小工具。",[1555,2096],{},[1526,2098,2100],{"id":2099},"嵌套查询与-resolver-链","🛠 嵌套查询与 resolver 链",[1531,2102,2103,2104,2107,2108,2111],{},"GraphQL 一次取回关联数据的能力，是它相比 REST 的一个突出优势。上一篇我们在 Schema 里写过 ",[1565,2105,2106],{},"User"," 和 ",[1565,2109,2110],{},"Article"," 的关联，现在把它实现完整。",[1531,2113,2114,2115,2118],{},"先是模拟数据，文章里用 ",[1565,2116,2117],{},"authorId"," 记录作者：",[1570,2120,2123],{"className":1666,"code":2121,"filename":2122,"language":1668,"meta":1575,"style":1575},"export const users = [\n    { id: '1', username: '小明', age: 20 },\n    { id: '2', username: '小美', age: 22 },\n];\n\nexport const articles = [\n    { id: '1', title: 'GraphQL 入门', authorId: '1' },\n    { id: '2', title: 'Vue3 实战', authorId: '1' },\n    { id: '3', title: 'Node.js 基础', authorId: '2' },\n];\n","data.js",[1565,2124,2125,2142,2185,2223,2231,2237,2250,2293,2333,2376],{"__ignoreMap":1575},[1579,2126,2127,2131,2134,2137,2139],{"class":1581,"line":1582},[1579,2128,2130],{"class":2129},"s8pZq","export",[1579,2132,2133],{"class":1675}," const",[1579,2135,2136],{"class":1679}," users ",[1579,2138,1684],{"class":1683},[1579,2140,2141],{"class":1679}," [\n",[1579,2143,2144,2147,2150,2152,2155,2157,2160,2162,2165,2167,2169,2171,2173,2175,2178,2180,2183],{"class":1581,"line":1588},[1579,2145,2146],{"class":1683},"    {",[1579,2148,2149],{"class":1692}," id",[1579,2151,1696],{"class":1683},[1579,2153,2154],{"class":1683}," '",[1579,2156,1923],{"class":1922},[1579,2158,2159],{"class":1683},"'",[1579,2161,1716],{"class":1683},[1579,2163,2164],{"class":1692}," username",[1579,2166,1696],{"class":1683},[1579,2168,2154],{"class":1683},[1579,2170,2047],{"class":1922},[1579,2172,2159],{"class":1683},[1579,2174,1716],{"class":1683},[1579,2176,2177],{"class":1692}," age",[1579,2179,1696],{"class":1683},[1579,2181,2182],{"class":2037}," 20",[1579,2184,2052],{"class":1683},[1579,2186,2187,2189,2191,2193,2195,2198,2200,2202,2204,2206,2208,2210,2212,2214,2216,2218,2221],{"class":1581,"line":1594},[1579,2188,2146],{"class":1683},[1579,2190,2149],{"class":1692},[1579,2192,1696],{"class":1683},[1579,2194,2154],{"class":1683},[1579,2196,2197],{"class":1922},"2",[1579,2199,2159],{"class":1683},[1579,2201,1716],{"class":1683},[1579,2203,2164],{"class":1692},[1579,2205,1696],{"class":1683},[1579,2207,2154],{"class":1683},[1579,2209,2078],{"class":1922},[1579,2211,2159],{"class":1683},[1579,2213,1716],{"class":1683},[1579,2215,2177],{"class":1692},[1579,2217,1696],{"class":1683},[1579,2219,2220],{"class":2037}," 22",[1579,2222,2052],{"class":1683},[1579,2224,2225,2228],{"class":1581,"line":1600},[1579,2226,2227],{"class":1679},"]",[1579,2229,2230],{"class":1683},";\n",[1579,2232,2233],{"class":1581,"line":1645},[1579,2234,2236],{"emptyLinePlaceholder":2235},true,"\n",[1579,2238,2239,2241,2243,2246,2248],{"class":1581,"line":1651},[1579,2240,2130],{"class":2129},[1579,2242,2133],{"class":1675},[1579,2244,2245],{"class":1679}," articles ",[1579,2247,1684],{"class":1683},[1579,2249,2141],{"class":1679},[1579,2251,2252,2254,2256,2258,2260,2262,2264,2266,2269,2271,2273,2276,2278,2280,2283,2285,2287,2289,2291],{"class":1581,"line":1980},[1579,2253,2146],{"class":1683},[1579,2255,2149],{"class":1692},[1579,2257,1696],{"class":1683},[1579,2259,2154],{"class":1683},[1579,2261,1923],{"class":1922},[1579,2263,2159],{"class":1683},[1579,2265,1716],{"class":1683},[1579,2267,2268],{"class":1692}," title",[1579,2270,1696],{"class":1683},[1579,2272,2154],{"class":1683},[1579,2274,2275],{"class":1922},"GraphQL 入门",[1579,2277,2159],{"class":1683},[1579,2279,1716],{"class":1683},[1579,2281,2282],{"class":1692}," authorId",[1579,2284,1696],{"class":1683},[1579,2286,2154],{"class":1683},[1579,2288,1923],{"class":1922},[1579,2290,2159],{"class":1683},[1579,2292,2052],{"class":1683},[1579,2294,2295,2297,2299,2301,2303,2305,2307,2309,2311,2313,2315,2317,2319,2321,2323,2325,2327,2329,2331],{"class":1581,"line":1985},[1579,2296,2146],{"class":1683},[1579,2298,2149],{"class":1692},[1579,2300,1696],{"class":1683},[1579,2302,2154],{"class":1683},[1579,2304,2197],{"class":1922},[1579,2306,2159],{"class":1683},[1579,2308,1716],{"class":1683},[1579,2310,2268],{"class":1692},[1579,2312,1696],{"class":1683},[1579,2314,2154],{"class":1683},[1579,2316,1033],{"class":1922},[1579,2318,2159],{"class":1683},[1579,2320,1716],{"class":1683},[1579,2322,2282],{"class":1692},[1579,2324,1696],{"class":1683},[1579,2326,2154],{"class":1683},[1579,2328,1923],{"class":1922},[1579,2330,2159],{"class":1683},[1579,2332,2052],{"class":1683},[1579,2334,2336,2338,2340,2342,2344,2347,2349,2351,2353,2355,2357,2360,2362,2364,2366,2368,2370,2372,2374],{"class":1581,"line":2335},9,[1579,2337,2146],{"class":1683},[1579,2339,2149],{"class":1692},[1579,2341,1696],{"class":1683},[1579,2343,2154],{"class":1683},[1579,2345,2346],{"class":1922},"3",[1579,2348,2159],{"class":1683},[1579,2350,1716],{"class":1683},[1579,2352,2268],{"class":1692},[1579,2354,1696],{"class":1683},[1579,2356,2154],{"class":1683},[1579,2358,2359],{"class":1922},"Node.js 基础",[1579,2361,2159],{"class":1683},[1579,2363,1716],{"class":1683},[1579,2365,2282],{"class":1692},[1579,2367,1696],{"class":1683},[1579,2369,2154],{"class":1683},[1579,2371,2197],{"class":1922},[1579,2373,2159],{"class":1683},[1579,2375,2052],{"class":1683},[1579,2377,2379,2381],{"class":1581,"line":2378},10,[1579,2380,2227],{"class":1679},[1579,2382,2230],{"class":1683},[1531,2384,2385,2386,2388,2389,2392],{},"Schema 里让 ",[1565,2387,2106],{}," 带上 ",[1565,2390,2391],{},"articles"," 字段：",[1570,2394,2396],{"className":1572,"code":2395,"language":1574,"meta":1575,"style":1575},"type Article {\n    id: ID!\n    title: String!\n}\n\ntype User {\n    id: ID!\n    username: String!\n    articles: [Article!]!\n}\n",[1565,2397,2398,2403,2408,2413,2417,2421,2426,2430,2435,2440],{"__ignoreMap":1575},[1579,2399,2400],{"class":1581,"line":1582},[1579,2401,2402],{},"type Article {\n",[1579,2404,2405],{"class":1581,"line":1588},[1579,2406,2407],{},"    id: ID!\n",[1579,2409,2410],{"class":1581,"line":1594},[1579,2411,2412],{},"    title: String!\n",[1579,2414,2415],{"class":1581,"line":1600},[1579,2416,1603],{},[1579,2418,2419],{"class":1581,"line":1645},[1579,2420,2236],{"emptyLinePlaceholder":2235},[1579,2422,2423],{"class":1581,"line":1651},[1579,2424,2425],{},"type User {\n",[1579,2427,2428],{"class":1581,"line":1980},[1579,2429,2407],{},[1579,2431,2432],{"class":1581,"line":1985},[1579,2433,2434],{},"    username: String!\n",[1579,2436,2437],{"class":1581,"line":2335},[1579,2438,2439],{},"    articles: [Article!]!\n",[1579,2441,2442],{"class":1581,"line":2378},[1579,2443,1603],{},[1531,2445,2446,2447,2450,2451,2457,2458,2460],{},"关键在 resolvers。注意 ",[1565,2448,2449],{},"users"," 数组里的用户对象",[1538,2452,2453,2454,2456],{},"并没有 ",[1565,2455,2391],{}," 属性","，所以需要给 ",[1565,2459,2106],{}," 类型单独写一个 resolver，告诉 GraphQL「用户的文章怎么取」：",[1570,2462,2464],{"className":1666,"code":2463,"language":1668,"meta":1575,"style":1575},"const resolvers = {\n    Query: {\n        users: () => users,\n        user: (parent, args) => users.find((item) => item.id === args.id),\n    },\n    User: {\n        articles: (parent) =>\n            articles.filter((item) => item.authorId === parent.id),\n    },\n};\n",[1565,2465,2466,2476,2484,2500,2550,2554,2563,2579,2617,2621],{"__ignoreMap":1575},[1579,2467,2468,2470,2472,2474],{"class":1581,"line":1582},[1579,2469,1676],{"class":1675},[1579,2471,1680],{"class":1679},[1579,2473,1684],{"class":1683},[1579,2475,1687],{"class":1683},[1579,2477,2478,2480,2482],{"class":1581,"line":1588},[1579,2479,1693],{"class":1692},[1579,2481,1696],{"class":1683},[1579,2483,1687],{"class":1683},[1579,2485,2486,2489,2491,2494,2496,2498],{"class":1581,"line":1594},[1579,2487,2488],{"class":1703},"        users",[1579,2490,1696],{"class":1683},[1579,2492,2493],{"class":1683}," ()",[1579,2495,1725],{"class":1675},[1579,2497,1728],{"class":1679},[1579,2499,1767],{"class":1683},[1579,2501,2502,2504,2506,2508,2510,2512,2514,2516,2518,2520,2522,2524,2526,2528,2530,2532,2534,2536,2538,2540,2542,2544,2546,2548],{"class":1581,"line":1600},[1579,2503,1704],{"class":1703},[1579,2505,1696],{"class":1683},[1579,2507,1709],{"class":1683},[1579,2509,1713],{"class":1712},[1579,2511,1716],{"class":1683},[1579,2513,1719],{"class":1712},[1579,2515,1722],{"class":1683},[1579,2517,1725],{"class":1675},[1579,2519,1728],{"class":1679},[1579,2521,1731],{"class":1683},[1579,2523,1734],{"class":1703},[1579,2525,1737],{"class":1679},[1579,2527,1737],{"class":1683},[1579,2529,1742],{"class":1712},[1579,2531,1722],{"class":1683},[1579,2533,1725],{"class":1675},[1579,2535,1749],{"class":1679},[1579,2537,1731],{"class":1683},[1579,2539,1754],{"class":1679},[1579,2541,1757],{"class":1683},[1579,2543,1719],{"class":1679},[1579,2545,1731],{"class":1683},[1579,2547,1764],{"class":1679},[1579,2549,1767],{"class":1683},[1579,2551,2552],{"class":1581,"line":1645},[1579,2553,1772],{"class":1683},[1579,2555,2556,2559,2561],{"class":1581,"line":1651},[1579,2557,2558],{"class":1692},"    User",[1579,2560,1696],{"class":1683},[1579,2562,1687],{"class":1683},[1579,2564,2565,2568,2570,2572,2574,2576],{"class":1581,"line":1980},[1579,2566,2567],{"class":1703},"        articles",[1579,2569,1696],{"class":1683},[1579,2571,1709],{"class":1683},[1579,2573,1713],{"class":1712},[1579,2575,1722],{"class":1683},[1579,2577,2578],{"class":1675}," =>\n",[1579,2580,2581,2584,2586,2589,2591,2593,2595,2597,2599,2601,2603,2606,2608,2611,2613,2615],{"class":1581,"line":1985},[1579,2582,2583],{"class":1679},"            articles",[1579,2585,1731],{"class":1683},[1579,2587,2588],{"class":1703},"filter",[1579,2590,1737],{"class":1679},[1579,2592,1737],{"class":1683},[1579,2594,1742],{"class":1712},[1579,2596,1722],{"class":1683},[1579,2598,1725],{"class":1675},[1579,2600,1749],{"class":1679},[1579,2602,1731],{"class":1683},[1579,2604,2605],{"class":1679},"authorId ",[1579,2607,1757],{"class":1683},[1579,2609,2610],{"class":1679}," parent",[1579,2612,1731],{"class":1683},[1579,2614,1764],{"class":1679},[1579,2616,1767],{"class":1683},[1579,2618,2619],{"class":1581,"line":2335},[1579,2620,1772],{"class":1683},[1579,2622,2623],{"class":1581,"line":2378},[1579,2624,1777],{"class":1683},[1531,2626,2627,2628,2630,2631,2633,2634,2639,2640,2643],{},"这里 ",[1565,2629,1713],{}," 参数就登场了：当客户端查询某个用户的 ",[1565,2632,2391],{}," 时，",[1538,2635,2636,2638],{},[1565,2637,1713],{}," 就是上一层解析出来的那个用户对象","，我们用 ",[1565,2641,2642],{},"parent.id"," 去文章数组里过滤出他的作品。",[1531,2645,2646,2647,2650,2651,2654],{},"整个过程像接力赛：",[1565,2648,2649],{},"Query.users"," 先跑出用户列表，然后对每个用户，",[1565,2652,2653],{},"User.articles"," 接过「棒」（parent），跑出他的文章。客户端只需要一条查询：",[1570,2656,2658],{"className":1572,"code":2657,"language":1574,"meta":1575,"style":1575},"{\n    users {\n        username\n        articles {\n            title\n        }\n    }\n}\n",[1565,2659,2660,2664,2669,2673,2678,2683,2688,2692],{"__ignoreMap":1575},[1579,2661,2662],{"class":1581,"line":1582},[1579,2663,1627],{},[1579,2665,2666],{"class":1581,"line":1588},[1579,2667,2668],{},"    users {\n",[1579,2670,2671],{"class":1581,"line":1594},[1579,2672,1637],{},[1579,2674,2675],{"class":1581,"line":1600},[1579,2676,2677],{},"        articles {\n",[1579,2679,2680],{"class":1581,"line":1645},[1579,2681,2682],{},"            title\n",[1579,2684,2685],{"class":1581,"line":1651},[1579,2686,2687],{},"        }\n",[1579,2689,2690],{"class":1581,"line":1980},[1579,2691,1648],{},[1579,2693,2694],{"class":1581,"line":1985},[1579,2695,1603],{},[1531,2697,2698],{},"就能拿到「每个用户带着自己文章列表」的完整结构。换成 REST，这通常要先请求用户列表，再逐个请求文章接口，来回好几趟。",[2700,2701,2702],"warning",{},[1531,2703,2704,2705,2708,2709,2711,2712,2714],{},"只有",[1538,2706,2707],{},"当前类型本身没有的字段","才需要写类型级 resolver（如 ",[1565,2710,2653],{},"）。像 ",[1565,2713,2038],{}," 这种数据里本来就有的字段，GraphQL 会默认从对象上按字段名取，不用写。",[1555,2716],{},[1526,2718,2720],{"id":2719},"小节总结","🧾 小节总结",[1782,2722,2723,2732,2739,2745,2751],{},[1785,2724,2725,2726,2728,2729,2731],{},"查询字段可以声明参数，如 ",[1565,2727,1608],{},"，resolver 通过第二个参数 ",[1565,2730,1662],{}," 接收。",[1785,2733,2734,2735,2738],{},"用 ",[1565,2736,2737],{},"$变量"," 加独立 JSON 的方式动态传值，查询语句可复用，避免拼字符串。",[1785,2740,2734,2741,2744],{},[1565,2742,2743],{},"别名: 字段"," 可以在一次请求里重复查询同一字段，返回键名随别名。",[1785,2746,2747,2748,2750],{},"关联数据通过嵌套查询一次取回，类型级 resolver 用第一个参数 ",[1565,2749,1713],{}," 拿到上一层数据。",[1785,2752,2753],{},"数据对象上已有的字段不用写 resolver，GraphQL 默认按字段名取值。",[1555,2755],{},[1526,2757,2759],{"id":2758},"知识问答","❓ 知识问答",[1531,2761,2762],{},[1538,2763,2764,2765,2767],{},"Q1：操作名 ",[1565,2766,1862],{}," 是必须的吗？",[1531,2769,2770],{},"不是必须的，但建议养成习惯。服务端日志里会记录操作名，线上排查问题时能快速定位是哪次查询出的问题。",[1531,2772,2773],{},[1538,2774,2775],{},"Q2：变量能传对象、数组吗？",[1531,2777,2778,2779,2782],{},"可以。变量支持任何 Schema 里声明的类型，包括后面会讲的 ",[1565,2780,2781],{},"input"," 输入对象类型，Mutation 传复杂数据时就靠它。",[1531,2784,2785],{},[1538,2786,2787],{},"Q3：嵌套查询会不会有性能问题？",[1531,2789,2790,2791,2793],{},"有可能。比如每个用户的 ",[1565,2792,2391],{}," 都去查一次数据库，100 个用户就是 100 次查询，这就是常说的 N+1 问题。学习阶段不用担心，了解这个概念即可，实际项目可以用 DataLoader 批量合并查询。",[1531,2795,2796],{},[1538,2797,2798],{},"Q4：参数能传多个吗？",[1531,2800,2801,2802,2805,2806,2809,2810,2813],{},"可以，逗号分隔，例如 ",[1565,2803,2804],{},"articles(first: Int, after: String)","。resolver 里通过 ",[1565,2807,2808],{},"args.first","、",[1565,2811,2812],{},"args.after"," 取用，常用于分页。",[1531,2815,2816],{},[1538,2817,2818,2819,2821],{},"Q5：parent 在顶层 ",[1565,2820,1567],{}," 的 resolver 里是什么？",[1531,2823,2824,2825,2828],{},"顶层查询没有「上一层」，parent 是一个基本用不到的根值，所以惯例上直接用不到就不写它，或者写成 ",[1565,2826,2827],{},"_"," 占位。",[1555,2830],{},[1526,2832,2834],{"id":2833},"小练习","🧪 小练习",[1531,2836,2837,2838,2840,2841,2844,2845,2107,2847,2850],{},"练习一：给 ",[1565,2839,1567],{}," 增加一个 ",[1565,2842,2843],{},"article(id: ID!): Article"," 查询，用变量写出查询语句，在 Sandbox 里分别传入 ",[1565,2846,1816],{},[1565,2848,2849],{},"\"99\"","，观察找不到时返回什么。",[1570,2852,2854],{"className":1572,"code":2853,"language":1574,"meta":1575,"style":1575},"# 请在这里编写代码\n",[1565,2855,2856],{"__ignoreMap":1575},[1579,2857,2858],{"class":1581,"line":1582},[1579,2859,2853],{},[1531,2861,2862,2863,2865,2866,2868,2869,2872],{},"练习二：模仿 ",[1565,2864,2653],{}," 的写法，给 ",[1565,2867,2110],{}," 类型加一个 ",[1565,2870,2871],{},"author: User!"," 字段并写出它的 resolver，然后在一次查询里取出「每篇文章的标题和作者名」。",[1570,2874,2876],{"className":1666,"code":2875,"language":1668,"meta":1575,"style":1575},"const resolvers = {\n    Article: {\n        // 请在这里编写代码\n    },\n};\n",[1565,2877,2878,2888,2897,2903,2907],{"__ignoreMap":1575},[1579,2879,2880,2882,2884,2886],{"class":1581,"line":1582},[1579,2881,1676],{"class":1675},[1579,2883,1680],{"class":1679},[1579,2885,1684],{"class":1683},[1579,2887,1687],{"class":1683},[1579,2889,2890,2893,2895],{"class":1581,"line":1588},[1579,2891,2892],{"class":1692},"    Article",[1579,2894,1696],{"class":1683},[1579,2896,1687],{"class":1683},[1579,2898,2899],{"class":1581,"line":1594},[1579,2900,2902],{"class":2901},"syuKq","        // 请在这里编写代码\n",[1579,2904,2905],{"class":1581,"line":1600},[1579,2906,1772],{"class":1683},[1579,2908,2909],{"class":1581,"line":1645},[1579,2910,1777],{"class":1683},[1555,2912],{},[1531,2914,2915],{},"🎉 恭喜你已经掌握 GraphQL 查询的常用技能啦！目前我们的数据还是只读的，下一篇学习 Mutation，实现数据的新增、更新和删除。",[2917,2918,2919],"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 .s50WR, html code.shiki .s50WR{--shiki-light:#9C3EDA;--shiki-default:#C792EA;--shiki-dark:#C792EA}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 .sd2Uz, html code.shiki .sd2Uz{--shiki-light:#E53935;--shiki-default:#F07178;--shiki-dark:#F07178}html pre.shiki code .swgpB, html code.shiki .swgpB{--shiki-light:#6182B8;--shiki-default:#82AAFF;--shiki-dark:#82AAFF}html pre.shiki code .sK9QF, html code.shiki .sK9QF{--shiki-light:#90A4AE;--shiki-light-font-style:italic;--shiki-default:#EEFFFF;--shiki-default-font-style:italic;--shiki-dark:#BABED8;--shiki-dark-font-style:italic}html pre.shiki code .sIEYB, html code.shiki .sIEYB{--shiki-light:#91B859;--shiki-default:#C3E88D;--shiki-dark:#C3E88D}html pre.shiki code .sYGMc, html code.shiki .sYGMc{--shiki-light:#E2931D;--shiki-default:#FFCB6B;--shiki-dark:#FFCB6B}html pre.shiki code .smPcV, html code.shiki .smPcV{--shiki-light:#F76D47;--shiki-default:#F78C6C;--shiki-dark:#F78C6C}html pre.shiki code .s8pZq, html code.shiki .s8pZq{--shiki-light:#39ADB5;--shiki-light-font-style:italic;--shiki-default:#89DDFF;--shiki-default-font-style:italic;--shiki-dark:#89DDFF;--shiki-dark-font-style:italic}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":1575,"searchDepth":1588,"depth":1588,"links":2921},[2922,2923,2924,2925,2926,2927,2928,2929],{"id":1528,"depth":1588,"text":1529},{"id":1559,"depth":1588,"text":1560},{"id":1809,"depth":1588,"text":1810},{"id":1938,"depth":1588,"text":1939},{"id":2099,"depth":1588,"text":2100},{"id":2719,"depth":1588,"text":2720},{"id":2758,"depth":1588,"text":2759},{"id":2833,"depth":1588,"text":2834},"掌握 GraphQL 查询的常用技能，学会字段参数、查询变量、别名，以及一次请求嵌套获取关联数据。","md",null,{},{"title":1363},{"title":1521,"description":2930},"myO8H1Bcn3",[2938,2940],{"title":1359,"path":1360,"stem":1361,"description":2939,"children":-1},"掌握 GraphQL Schema 的类型系统，学会标量类型、非空、列表、枚举的写法，并能描述对象之间的关联。",{"title":1367,"path":1368,"stem":1369,"description":2941,"children":-1},"掌握 GraphQL Mutation 的用法，学会用 input 类型组织入参，实现数据的新增、更新和删除。",1784715109961]