小编Ale*_*sio的帖子

我是Graphviz的新手,我正在尝试绘制一个以实体为中心的树(我正在使用该twopi命令).

• 如果我把overlap=true它重叠,即使它有很多空间引起重叠的标签.
• 如果我放overlap=false,标签变得太小.

如何在没有重叠的情况下获得第一种情况？

完整代码:

digraph g {
    graph [ fontname = "Helvetica",
        fontsize = 10,
        size = "500,500",
        splines=true,
        overlap=false,
        ratio=.5 ];
    node [  shape = plaintext,
        fontname = "Helvetica" ];

    root="owl:Thing";
    "owl:Thing" -> "Work";
    "Work" -> "WrittenWork";
    "Work" -> "Software";
    "Work" -> "Website";
    "Work" -> "Film";
    "owl:Thing" -> "Agent";
    "Agent" -> "Organisation";
    "Organisation" -> "Non-ProfitOrganisation";
    "Organisation" -> "GeopoliticalOrganisation";
    "Organisation" -> "SambaSchool";
    "Agent" -> "Person";
    "Person" -> "Athlete";
    "Person" -> "OfficeHolder";
    "Person" -> …

我是目标C的新手,我需要执行一个查询,在php中可能如下:

$alreadyDone = array();
do {
    $query = "SELECT * FROM myTable WHERE id NOT IN (".implode(",", $alreadyDone).")";
    $res = mysql_query($query);
    $n = mysql_num_rows($res);
    while ($r = mysql_fetch_assoc($res)) {
        // do some stuff
        $alreadyDone[] = $r['id'];
    }
} while ($n > 1);

我的第一个问题是:是否有一个类似于sql"NOT IN"的函数？

但是我试着自己制作它,然后我选择了行并将其放入NSArray *alreadyDone.第二个问题:我如何在Core Data中构建一个查询NSPredicate来比较一个字段和我已经拥有的对象,在示例中每个元素都是alreadyDone？

非常感谢您的回答,对不起我的英语(我是意大利语).