在哪里和Sqlite声明

Question

我在以下SQL语句中组合两个WHERE语句时遇到问题：

query = [[NSString alloc] initWithFormat: @"SELECT Name, Description,Postcode,AddressLine1, ImageURL, Free, Area, OpeningTimes, NearestTube, Cost,UniqueID, URL, Number, FirstLetter FROM MainDetails WHERE Free ='Y' AND FirstLetter = '%@%'",tmpLike];

我想说Free在哪里等于Y而FirstLetter等于tmplike，但是上面没有用。

有人可以帮忙吗？

Answer 1

您使用通配符，因此您希望LIKE不等于（=）;

... WHERE Free ='Y' AND FirstLetter LIKE '%@%'"

Answer 2

尝试从最后删除％

query = [[NSString alloc] initWithFormat: @"SELECT Name, Description,Postcode,AddressLine1, ImageURL, Free, Area, OpeningTimes, NearestTube, Cost,UniqueID, URL, Number, FirstLetter FROM MainDetails WHERE Free ='Y' AND FirstLetter = '%@'",tmpLike];

Answer 3

尝试使用escape char'/'

 query = [[NSString alloc] initWithFormat: @"SELECT Name, Description,Postcode,AddressLine1, ImageURL, Free, Area, OpeningTimes, NearestTube, Cost,UniqueID, URL, Number, FirstLetter FROM MainDetails WHERE Free ='Y' AND FirstLetter = '%@\%'",tmpLike];

Answer 4

使用此工作正常

query = [[NSString alloc] initWithFormat: @"SELECT Name, Description,Postcode,AddressLine1, ImageURL, Free, Area, OpeningTimes, NearestTube, Cost,UniqueID, URL, Number, FirstLetter FROM MainDetails WHERE Free ='Y' AND FirstLetter LIKE '%@ %%'",tmpLike];

Answer 5

也许只是括号？

... WHERE (Free ='Y') AND (FirstLetter LIKE '%@')",tmpLike];