Ios 如何将select语句与objc中的多个where值一起使用？

我认为这不是正确的格式，因为控制台在nslog处停止检索所有权结果。我需要解决这个问题吗？创建临时表以存储qr的where，然后搜索where用户？或者我可以只更新我的sql语句吗

[database executeQuery:@"select * from ownership where qrcode = ? and user = ?;", ktQRcode, userktid];

NSLog(@"retrieving ownership results through qrcode and userid");

while ([results next]) {

    OWNERSHIP *ktownership = [OWNERSHIP new];

    ktownership.uniqueIDownership = [results intForColumn:@"id"];

    ktownership.user = [results intForColumn:@"user"];

    ktownership.qrcode = [results intForColumn:@"qrcode"];

    ktownership.create_at = [results dateForColumn:@"create_at"];

    [foundOwnership addObject:ktownership];

    ownershipcount = [foundOwnership count];

    NSLog(@"addnewownership count: %lu", foundOwnership.count);

    NSLog(@"addnewownership Array: %@", foundOwnership);

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您没有向我们显示分配

结果的位置

变量。您还应检查故障，例如：

FMResultSet *results = [database executeQuery:@"select * from ownership where qrcode = ? and user = ?;", ktQRcode, userktid];

if (!results) {
    NSLog(@"select error: %@", [database lastErrorMessage]);
} else {
    NSLog(@"retrieving ownership results through qrcode and userid");
}

while ([results next]) {

    OWNERSHIP *ktownership = [OWNERSHIP new];

    // the rest of your code here
}

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“它停止”是什么意思？您是否收到错误消息或堆栈跟踪？你有没有不小心在那一行设置了一个断点（空白处的蓝色标志）？好的，我就这么做了，但是我没有收到错误消息，所以我现在做的是只选择where qrcode=？然后我只在ktownership.user==useridI的情况下将结果添加到我的数组。我不明白这个问题：你是说当你将

user

条件添加到

where

子句时，你没有得到任何记录，但是如果你从SQL中省略它，你会得到很多记录，包括你最初寻找的记录？您绝对不应该检索所有内容，然后手动对其进行筛选。听起来似乎存在一些简单的数据问题，但根据提供的有限信息，根本不清楚问题是什么。