Question

从xcode运行以下查询。然而，它没有返回任何结果。我很确定它应该返回结果，并且可以通过从sqlite浏览器运行相同的查询来确认相同的结果。但是，在xcode中，sqlite3_step返回代码101。我在这做错了什么？

    NSMutableArray *pages = [[NSMutableArray alloc] init];

    char *query = " \
    drop table if exists tempT; \
    \
    create temporary table tempT \
    as \
    select \
    Page \
    from \
    ( \
     select 1 as Sort, 'Home' as Page \
     union \
     select 2 as Sort, 'Research' as Page \
     union \
     select distinct 3 as Sort, Category as Page from Researches \
     union \
     select 4 as Sort, 'Drafts' as Page \
     union \
     select 5 as Sort, 'Outbox' as Page \
     union \
     select 6 as Sort, 'Download' as Page \
     union \
     select 7 as Sort, 'Settings' as Page \
     union \
     select 8 as Sort, 'Deleted' as Page \
     ) as Sub \
    ORDER BY Sort, Page \
    ; \
     \
    select Page from tempT order by rowid \
    ";
    sqlite3_stmt *stmt;
    if (sqlite3_prepare_v2(database, query, -1, &stmt, nil) == SQLITE_OK)
    {
        while (sqlite3_step(stmt) == SQLITE_ROW)
        {
            [pages addObject: [NSString stringWithUTF8String: (char *)sqlite3_column_text(stmt, 0)]];
        }

        sqlite3_finalize(stmt);
    }

    return pages;

Answer 1

sqlite3_prepare_v2只准备第一个语句，你必须单独运行3个语句。

请参阅：http://www.sqlite.org/c3ref/prepare.html

如果pzTail不为NULL，则* pzTail指向zSql中第一个SQL语句结尾之后的第一个字节。这些例程只编译zSql中的第一个语句，因此* pzTail指向仍未编译的内容。

SQLite查询不返回结果

1 个答案: