sqlite xcode 查询子句

Posted 2023-03-23

【中文标题】sqlite xcode 查询子句

【英文标题】：sqlite xcode query clause

【发布时间】：2013-02-24 07:56:16

【问题描述】：

我对 sqlite 的查询遇到了一些奇怪的问题。 当我的 firstvar 值介于 30000 和 100000 之间时，我的查询不会返回任何内容。但是当 var 低于 30000 且大于 100000 时，它会。它在我的 xcode 应用程序中与在 sqlite 浏览器中相同。

SELECT * FROM OFFERS WHERE price > firstvar AND price < secondvar

这里是一些示例数据： http://www.purespain.com/example%20data.png

所以当我执行查询时

    SELECT * FROM OFFERS WHERE price > 40000 AND price < 300000

我没有输出，但有很多价格 (prijs) 应该符合标准。

例如当我表演时

  SELECT * FROM OFFERS WHERE price > 140000 AND price < 300000

或 SELECT * FROM OFFERS WHERE price > 0 AND price

那么我有正确的结果

执行查询的代码是：

-(NSMutableArray *)selectOffersWithOndergrens:(int)ondergrens andBovengrens:(int)bovengrens andSoort:(NSString *)soort

NSArray *path = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask , YES);
NSString *docpath = [path objectAtIndex:0];
dbPathString = [docpath stringByAppendingPathComponent:@"puurspanje.db"];

Offers = [[NSMutableArray alloc] init];

// Get all newsitems from the sqlite database
sqlite3_stmt *get_offers_stmt;
NSString *querysql = [[NSString alloc]init];
if (sqlite3_open([dbPathString UTF8String], &puurspanjeDB)==SQLITE_OK)
    [Offers removeAllObjects];

    if (![soort isEqual: @"alle"])
        querysql = [NSString stringWithFormat:@"SELECT * FROM OFFERS WHERE prijs > %d AND prijs < %d AND soort = (SELECT TYPE_ID FROM TYPES WHERE NAME LIKE '%@' )", ondergrens, bovengrens, soort];
    else
        querysql = [NSString stringWithFormat:@"SELECT * FROM OFFERS WHERE prijs > %d AND prijs < %d", ondergrens, bovengrens];

    

    const char* query_sql = [querysql UTF8String];

    if (sqlite3_prepare(puurspanjeDB, query_sql, -1, &get_offers_stmt, NULL)==SQLITE_OK) 
        while (sqlite3_step(get_offers_stmt)==SQLITE_ROW) 
            NSString *listing_ID = [[NSString alloc]initWithUTF8String:(const char *) sqlite3_column_text(get_offers_stmt, 1)];
            NSString *titel = [[NSString alloc]initWithUTF8String:(const char * )sqlite3_column_text(get_offers_stmt, 2)];
            NSString *omschrijving = [[NSString alloc]initWithUTF8String:(const char * )sqlite3_column_text(get_offers_stmt, 3)];
            NSString *prijs = [[NSString alloc]initWithUTF8String:(const char * )sqlite3_column_text(get_offers_stmt, 4)];
            NSString *referentie = [[NSString alloc]initWithUTF8String:(const char*)sqlite3_column_text(get_offers_stmt, 5)];
            NSString *slaapkamer = [[NSString alloc]initWithUTF8String:(const char*)sqlite3_column_text(get_offers_stmt, 6)];
            NSString *verdiep = [[NSString alloc]initWithUTF8String:(const char*)sqlite3_column_text(get_offers_stmt, 7)];
            NSString *badkamers = [[NSString alloc]initWithUTF8String:(const char*)sqlite3_column_text(get_offers_stmt, 8)];
            NSString *woonoppv = [[NSString alloc]initWithUTF8String:(const char*)sqlite3_column_text(get_offers_stmt, 9)];
            NSString *perceeloppv = [[NSString alloc]initWithUTF8String:(const char*)sqlite3_column_text(get_offers_stmt, 10)];
            NSString *kenmerken = [[NSString alloc]initWithUTF8String:(const char*)sqlite3_column_text(get_offers_stmt, 11)];
            NSString *buurtkenmerken = [[NSString alloc]initWithUTF8String:(const char*)sqlite3_column_text(get_offers_stmt, 12)];
            NSString *indeling = [[NSString alloc]initWithUTF8String:(const char*)sqlite3_column_text(get_offers_stmt, 13)];
            NSString *hypotheek = [[NSString alloc]initWithUTF8String:(const char*)sqlite3_column_text(get_offers_stmt, 14)];
            NSString *soort = [[NSString alloc]initWithUTF8String:(const char*)sqlite3_column_text(get_offers_stmt, 15)];



            Offer *offer = [[Offer alloc]initWithListing_ID:listing_ID andTitel:titel andOmschrijving:omschrijving andPrijs:prijs andReferentie:referentie andSlaapkamers:slaapkamer andVerdiep:verdiep andBadkamers:badkamers andWoonoppv:woonoppv andPerceeloppv:perceeloppv andKenmerken:kenmerken andBuurtKenmerken:buurtkenmerken andIndeling:indeling andHypotheek:hypotheek andSoort:soort];
            [Offers addObject:offer];
        
    

return Offers;

我不知道可能是什么原因。任何帮助表示赞赏。

乔纳斯

【问题讨论】：

没有足够的信息来回答。显示示例数据以及预期和实际输出。

阅读FAQ.

我在我的主题中添加了一些信息。我希望问题现在已经清楚了

我没有看到price 列？

price = prijs 我的原始查询是 select* from offer where prijs > 40000

【参考方案1】：

原因是我选择文本作为数据类型而不是数字，并且因为文本中有空格，结果显示不正常。