四个注意点: 1.创建表时,声明字段类型为二进制 blob NSString *INEditorTableName = @"create table In_Editor(picUrls blob not null)"; 2.插入sql语句,把NSArray转换为NSData类型 NSData *dataImageUrls = [NSKeyedArchiver archivedDataWithRootObject:model.imageUrls]; 3.不能用 [NSString stringWithFormat: @"sql"]; [_db executeUpdate: @"insert into In_Editor ( picUrls) values (?);",dataImageUrls]; 4.读取数据: NSArray *imageArr = [NSKeyedUnarchiver unarchiveObjectWithData:picUrls] // 如果不注意,上面几点,可能会出现下面错误: * Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFData objectForKey:]: unrecognized selector sent to instance 0x6b46c80'
注: NSArray 与 NSData的相互转换 二进制 将NSArray转化为NSData类型 :NSData *data = [NSKeyedArchiver archivedDataWithRootObject:Array]; 将NSData转化为NSArray类型 :NSArray *array = [NSKeyedUnarchiver unarchiveObjectWithData:data]; Integer:值是signedinteger类型,大小可以是1,2,3,4,6,8bytes REAL:浮点类型 TEXT:以UTF-8,UTF-16BEorUTF-16LE编码存储的字符类型 BLOB:二进制数据
参考:
http://www.4byte.cn/question/22141/saving-nsarray-in-sqlite-and-retrieving-it.html
http://www.chengxuyuans.com/iPhone_IOS/37789.html
时间: 2024-10-13 03:31:12