小编Dan*_*ord的帖子

我正在尝试在Angular 2中创建一个WebSocket服务.这是我到目前为止所拥有的:

import {Injectable} from "angular2/core"
@Injectable()
export class ServerService {

    public ws:WebSocket;

    public myData = {};

    constructor() {
        let ws = new WebSocket('ws://localhost:8080/');

        ws.onopen = (event:Event) => {
            console.log("Socket has been opened!");
        };

        ws.onmessage = (event:Event) => {
            this.myData = JSON.parse(event.data);
        };
    };
}

问题是,在onmessage运行时,this关键字变为WebSocket对象,而不是我的ServerService对象.

似乎我的箭头功能充当了标准功能.可能是什么导致了这个？还有另一种方法可以回到ServerService对象吗？

我正在尝试动态构建一个具有 X 个条件的原始 SQL 查询。我正在使用此页面上的信息：https : //docs.microsoft.com/en-us/ef/core/querying/raw-sql

目前我有类似的东西：

String rawQuery = "SELECT * FROM ItemsTable WHERE ";

foreach (f in FilterList) {
  rawQuery = rawQuery + String.Format(f.condition, f.userInput);
  // f.condition is something like "Name LIKE {0}"
}

var filteredItems = context.ItemsTable
  .FromSql(rawQuery)
  .ToList();

问题是，我的参数在使用 .FromSql() 时没有被替换，所以我很容易受到 SQL 注入攻击。

有没有办法使用 .FromSql() 来完成这个任务？

或者，还有其他方法可以防止 SQL 注入吗？

我使用 Rocket、Diesel 和 SQLite 构建了一个 API。在本地运行良好。

现在我想将我的 API 部署到 Heroku。我不再举这个例子了。我已尽可能严格遵循随附的说明。但是，构建步骤返回以下错误：

error: linking with `cc` failed: exit code: 1
  |
  = note: "cc" "-Wl,--as-needed" "-Wl,-z,noexecstack" "-m64" "-Wl,--eh-frame-hdr" "-L" "/tmp/codon/tmp/cache/multirust/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib" "/tmp/codon/tmp/cache/target/release/deps/cardbox_api-1b33053639456c47.cardbox_api.2391d6uc-cgu.0.rcgu.o" "/tmp/codon/tmp/cache/target/release/deps/cardbox_api-1b33053639456c47.cardbox_api.2391d6uc-cgu.1.rcgu.o" "/tmp/codon/tmp/cache/target/release/deps/cardbox_api-1b33053639456c47.cardbox_api.2391d6uc-cgu.10.rcgu.o" "/tmp/codon/tmp/cache/target/release/deps/cardbox_api-1b33053639456c47.cardbox_api.2391d6uc-cgu.11.rcgu.o" "/tmp/codon/tmp/cache/target/release/deps/cardbox_api-1b33053639456c47.cardbox_api.2391d6uc-cgu.12.rcgu.o" "/tmp/codon/tmp/cache/target/release/deps/cardbox_api-1b33053639456c47.cardbox_api.2391d6uc-cgu.13.rcgu.o" "/tmp/codon/tmp/cache/target/release/deps/cardbox_api-1b33053639456c47.cardbox_api.2391d6uc-cgu.14.rcgu.o" "/tmp/codon/tmp/cache/target/release/deps/cardbox_api-1b33053639456c47.cardbox_api.2391d6uc-cgu.15.rcgu.o" "/tmp/codon/tmp/cache/target/release/deps/cardbox_api-1b33053639456c47.cardbox_api.2391d6uc-cgu.2.rcgu.o" "/tmp/codon/tmp/cache/target/release/deps/cardbox_api-1b33053639456c47.cardbox_api.2391d6uc-cgu.3.rcgu.o" "/tmp/codon/tmp/cache/target/release/deps/cardbox_api-1b33053639456c47.cardbox_api.2391d6uc-cgu.4.rcgu.o" "/tmp/codon/tmp/cache/target/release/deps/cardbox_api-1b33053639456c47.cardbox_api.2391d6uc-cgu.5.rcgu.o" "/tmp/codon/tmp/cache/target/release/deps/cardbox_api-1b33053639456c47.cardbox_api.2391d6uc-cgu.6.rcgu.o" "/tmp/codon/tmp/cache/target/release/deps/cardbox_api-1b33053639456c47.cardbox_api.2391d6uc-cgu.7.rcgu.o" "/tmp/codon/tmp/cache/target/release/deps/cardbox_api-1b33053639456c47.cardbox_api.2391d6uc-cgu.8.rcgu.o" "/tmp/codon/tmp/cache/target/release/deps/cardbox_api-1b33053639456c47.cardbox_api.2391d6uc-cgu.9.rcgu.o" "-o" "/tmp/codon/tmp/cache/target/release/deps/cardbox_api-1b33053639456c47" "/tmp/codon/tmp/cache/target/release/deps/cardbox_api-1b33053639456c47.xdi22qyw1jm4dgn.rcgu.o" "-Wl,--gc-sections" "-pie" "-Wl,-zrelro" "-Wl,-znow" "-Wl,-O1" "-nodefaultlibs" "-L" "/tmp/codon/tmp/cache/target/release/deps" "-L" "/tmp/codon/tmp/cache/target/release/build/ring-0f13c32780184988/out" "-L" "/tmp/codon/tmp/cache/multirust/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib" "-Wl,-Bstatic" "/tmp/codon/tmp/cache/target/release/deps/libuuid-ce4969afc97ad8b9.rlib" "/tmp/codon/tmp/cache/target/release/deps/libjsonwebtoken-44a266ecba46fbf1.rlib" "/tmp/codon/tmp/cache/target/release/deps/libpem-d45dd6ee3de1c97b.rlib" "/tmp/codon/tmp/cache/target/release/deps/libregex-c1e1617462b9257c.rlib" "/tmp/codon/tmp/cache/target/release/deps/libthread_local-3948ce50dadeb546.rlib" "/tmp/codon/tmp/cache/target/release/deps/libregex_syntax-54ff6446d5044f96.rlib" "/tmp/codon/tmp/cache/target/release/deps/libaho_corasick-c99fa63c4b172ad4.rlib" "/tmp/codon/tmp/cache/target/release/deps/libsimple_asn1-4334711a5a537225.rlib" "/tmp/codon/tmp/cache/target/release/deps/libnum_bigint-109e809cd264f00a.rlib" "/tmp/codon/tmp/cache/target/release/deps/libchrono-3405124ec15564a1.rlib" "/tmp/codon/tmp/cache/target/release/deps/libnum_integer-137bdd49e20d58ff.rlib" "/tmp/codon/tmp/cache/target/release/deps/libnum_traits-2d6f0e657d8b410e.rlib" "/tmp/codon/tmp/cache/target/release/deps/libring-fea6120cdf068f14.rlib" "/tmp/codon/tmp/cache/target/release/deps/libspin-8b88071a74fd1146.rlib" "/tmp/codon/tmp/cache/target/release/deps/libuntrusted-07c812cecbdda234.rlib" "/tmp/codon/tmp/cache/target/release/deps/libreqwest-b54031f22b1a4160.rlib" "/tmp/codon/tmp/cache/target/release/deps/libhyper_tls-b12b7cccc6f3158b.rlib" "/tmp/codon/tmp/cache/target/release/deps/libipnet-5dd6b6b4ddc5ef77.rlib" …