从NSMutable字典中分离键和对象,并使用sqlite的insert命令中的值

Question

大家好,我正在iphone中开发一个sqlite应用程序.因为我是这个应用程序的新手,我不知道如何在sqlite的insert语句的命令中使用NSMutableDictionary中的键和对象.例如,我想要以下面的格式插入语句.

插入TABLENAME(列名称作为NSMUTABLEDICTIONRY的键)值(作为来自NSMUTABLEDICTIONARY的对象)请帮助我.谢谢

Answer 1

我实际上对SQL知之甚少,但也许这样的东西可以帮助你:

NSDictionary *myDictionary = [NSDictionary dictionaryWithObjectsAndKeys:
                              @"Foo", @"Bar",
                              @"Foz", @"Baz",
                              nil];

NSMutableString *keys = [NSMutableString string];
NSMutableString *values = [NSMutableString string];
for (NSString *key in myDictionary) {
    [keys appendFormat:@"%@,", key];
    [values appendFormat:@"%@,", [myDictionary objectForKey:key]];
}
// remove last ,
[keys deleteCharactersInRange:NSMakeRange([keys length]-1, 1)];
[values deleteCharactersInRange:NSMakeRange([values length]-1, 1)]; 
NSString *sqlQuery = [NSString stringWithFormat:@"INSERT INTO TABLENAME %@ VALUES %@", keys, values];

// sqlQuery = INSERT INTO TABLENAME Bar,Baz VALUES Foo,Foz