不确定我的语法错误在哪里...
fruit这就是我创建android.database.sqlite.SQLiteException: near "trackuser":
syntax error (code 1 SQLITE_ERROR): , while compiling:
CREATE TABLE players(firstname TEXT, lastname TEXT, category INTEGER, wins INTEGER, losses INTEGER, trackuser INTEGER, FOREIGH KEY(trackuser) REFERENCES users(ID))
表的方式
users例如引用here
答案 0 :(得分：1)
您有一个拼写错误。您在main查询中使用public static void main(String[] args) {
ArrayList<URI> pageALinks = new ArrayList<>();
pageALinks.add(createURI("www.b.com"));
pageALinks.add(createURI("www.d.com"));
URI pageAURI = createURI("www.a.com");
WebPage pageA = new WebPage(pageAURI, new ArrayList<>(), pageALinks);
ArrayList<URI> pageBLinks = new ArrayList<>();
pageBLinks.add(createURI("www.c.com"));
pageBLinks.add(createURI("www.d.com"));
URI pageBURI = createURI("www.b.com");
WebPage pageB = new WebPage(pageBURI, new ArrayList<>(), pageBLinks);
ArrayList<URI> pageCLinks = new ArrayList<>();
URI pageCURI = createURI("www.c.com");
WebPage pageC = new WebPage(pageCURI, new ArrayList<>(), pageCLinks);
ArrayList<URI> pageDLinks = new ArrayList<>();
pageDLinks.add(createURI("www.a.com"));
URI pageDURI = createURI("www.d.com");
WebPage pageD = new WebPage(pageDURI, new ArrayList<>(), pageDLinks);
ArrayList<URI> pageELinks = new ArrayList<>();
pageELinks.add(createURI("www.d.com"));
URI pageEURI = createURI("www.e.com");
WebPage pageE = new WebPage(pageEURI, new ArrayList<>(), pageELinks);
HashSet<WebPage> pages = new HashSet<>();
pages.add(pageA);
pages.add(pageB);
pages.add(pageC);
pages.add(pageD);
pages.add(pageE);
HashMap<URI, HashSet<URI>> graph = makeGraph(pages);
HashMap<URI, Double> map = makePageRanks(graph, 0.85, 100, 0.00001);
}
而不是FOREIGH key。