sqlite只支持一些基本类型的存储（如TEXT，INTEGER，BLOB，REAL），但OC对象肯定无法直接通过存储sqlite中。
当然可以通过nskeyedarchiver进行归档，下面会介绍如何把OC对象存入sqlite的方法。话不多说：

一、把对象存入sqlite中
1、把对象转换成字典

id obj;
NSMutableDictionary *dic = [NSMutableDictionary dictionary];
unsigned int propsCount;
objc_property_t *props = class_copyPropertyList([obj class], &propsCount);
for(int i = 0;i < propsCount; i++)
{
    objc_property_t prop = props[i];

    NSString *propName = [NSString stringWithUTF8String:property_getName(prop)];

    if ([propName hasSuffix:@"Url"]) {
        continue;
    }

    id value = [obj valueForKey:propName];
    if(value == nil)
    {
        value = [NSNull null];
    }
    else
    {
        value = [self getObjectInternal:value];
        [dic setObject:value forKey:propName];
    }
}
free(props);
return dic;

2、把字典转换成字符串存储

    NSError *error = nil;
    NSData *result = [NSJSONSerialization dataWithJSONObject:dic                                    options:kNilOptions error:&error];

    NSString *jsonString = [[NSString alloc] initWithData:result                              encoding:NSUTF8StringEncoding];

最后把字符串存储到sqlite中。

二、从sqlite中取出对象
1、取出转换成NSDictionary

NSString *str = [rs stringForColumn:@"***"]; 
NSData* data = [str dataUsingEncoding:NSUTF8StringEncoding];
__autoreleasing NSError* error = nil;

NSDictionary *dict = [NSJSONSerialization            JSONObjectWithData:data options:kNilOptions error:&error];

2、从NSDictionary转换为OC对象

id obj = [[[obj class] alloc] init];
if (dict) {
        for (NSString *key in [dict keyEnumerator]) {
            if([key isEqualToString:@"***"]){
                obj.*** = [[keyedValues objectForKey:@"***"] intValue];
            }else if([key isEqualToString:@"***"]){
                obj.*** = [[keyedValues objectForKey:@"***"] boolValue];
            }
        }
    }