\u3053\u306e\u8a18\u4e8b\u306f\u30bf\u30a4\u30c8\u30eb\u306e\u901a\u308a\u300cSQLite\u3092\u4f7f\u3063\u3066ToDo\u30ea\u30b9\u30c8\u30a2\u30d7\u30ea\u3092\u4f5c\u6210\u300d\u306e\u7b2c\u4e09\u90e8\u306b\u306a\u308b\u306e\u3067\u3001\u524d\u56de\u307e\u3067\u306e\u8a18\u4e8b\u3092\u65e2\u306b\u8aad\u3093\u3067\u304f\u3060\u3055\u3063\u3066\u3044\u308b\u65b9\u3092\u5bfe\u8c61\u306b\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
\u3053\u306e\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u306e\u30e1\u30a4\u30f3\u306f\u3001\u9078\u629e\u3055\u308c\u305ftodo\u30a2\u30a4\u30c6\u30e0\u3092\u8868\u793a\u3059\u308b\u3053\u3068\u3067\u3059\u3002todo\u30b9\u30c6\u30fc\u30bf\u30b9\u3092\u66f4\u65b0\u3059\u308b\u65b9\u6cd5\u3082\u6271\u3044\u307e\u3059\u3002<\/p>\n
\u3053\u306e\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u3067\u306f\u3001todo\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306e\u6700\u5f8c\u306e\u5909\u6570complete \u306estatus(\u5b9f\u884c\u4e2d or \u5b8c\u4e86)\u3092\u53d6\u5f97\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u65e2\u306b\u8a2d\u5b9a\u3057\u305f\u901a\u308a\u3001complete\u30d5\u30a3\u30fc\u30eb\u30c9\u306e\u5024\u306fboolean(1= \u6b63\u30012=\u507d)\u3067\u3059\u3002\u3053\u306e\u5024\u3092\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u304b\u3089\u53d6\u308a\u51fa\u3057\u3001todo\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u95a2\u9023\u3065\u3051\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
\u307e\u305a\u3001\u6700\u521d\u306b\u3001\u3053\u306e\u5024\u3092\u53d6\u5f97\u3059\u308b\u305f\u3081\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u4f5c\u6210\u3057\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n
todo.h<\/strong> \u3092\u958b\u304d\u3001\u4ee5\u4e0b\u306e\u30b3\u30fc\u30c9\u3092\u8ffd\u52a0\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n #import <\/span><Foundation\/Foundation.h><\/p>\n #import <\/span><sqlite3.h><\/p>\n \n @interface<\/span> Todo : NSObject {<\/p>\n <\/span><\/span>sqlite3<\/span> *<\/span>database;<\/span><\/p>\n <\/span><\/span>NSString *<\/span>text<\/span>;<\/span><\/p>\n <\/span><\/span>NSInteger<\/span> <\/span>primaryKey;<\/span><\/p>\n <\/span><\/span>NSInteger <\/span>priority<\/span>;<\/span><\/p>\n <\/span>NSInteger<\/span> status;<\/p>\n <\/span>BOOL<\/span> dirty;<\/p>\n }<\/p>\n \n @property (<\/span>assign, <\/span>nonatomic, <\/span>readonly) NSInteger primaryKey;<\/span><\/p>\n @property (<\/span>nonatomic, <\/span>retain) NSString *text;<\/span><\/p>\n @property<\/span> (nonatomic<\/span>) NSInteger priority;<\/p>\n @property<\/span> (nonatomic<\/span>) NSInteger status;<\/p>\n \n – (id<\/span>)initWithPrimaryKey:(NSInteger<\/span>)pk database:(sqlite3<\/span> *)db;<\/p>\n – (void<\/span>)updateStatus:(NSInteger<\/span>) newStatus;<\/p>\n – (void<\/span>)updatePriority:(NSInteger<\/span>) newPriority;<\/p>\n – (void<\/span>)dehydrate;<\/p>\n \n @end<\/p>\n<\/blockquote>\n \u3053\u3053\u3067\u306f\u3044\u304f\u3064\u304b\u306e\u5909\u66f4\u304c\u3042\u308a\u307e\u3059\u3002\u307e\u305a\u3001NSinteger\u30b9\u30c6\u30fc\u30bf\u30b9\u3092\u8ffd\u52a0\u3057\u307e\u3057\u305f\u3002\u3053\u308c\u306f\u3001todo\u304c\u5b8c\u4e86\u3057\u305f\u304b\u3069\u3046\u304b\u306e\u30b9\u30c6\u30fc\u30bf\u30b9\u306b\u95a2\u9023\u3065\u3051\u3089\u308c\u308b\u30d7\u30ed\u30d1\u30c6\u30a3\u3067\u3059\u3002\u3055\u3089\u306b\u3001\u305d\u308c\u304b\u3089property\u3092\u4f5c\u6210\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n \u6b21\u306b\u3001dirty\u3068\u547c\u3070\u308c\u308bBOOL\u5024\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n \u3053\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092todo\u304c\u5909\u66f4\u3055\u308c\u3066\u3044\u308b\u5834\u5408\u3092\u793a\u3059\u305f\u3081\u306b\u4f7f\u3044\u307e\u3059\u3002<\/p>\n \u3053\u308c\u304c\u3069\u306e\u3088\u3046\u306a\u5f79\u5272\u3092\u679c\u305f\u3059\u306e\u304b\u306f\u3001dehydrate<\/strong> \u30e1\u30bd\u30c3\u30c9\u3092\u5b9f\u88c5\u3059\u308b\u3068\u304d\u306b\u5206\u304b\u308a\u307e\u3059\u3002<\/p>\n \u52a0\u3048\u3066\u3001\u4ee5\u4e0b\u306e\uff13\u3064\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u5ba3\u8a00\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n updateStatus<\/strong> – \u30b9\u30c6\u30fc\u30bf\u30b9\u306e\u5024\u3092\u66f4\u65b0\u3057\u305f\u3044\u6642\u306b\u547c\u3073\u51fa\u3059\u30e1\u30bd\u30c3\u30c9\u3067\u3059\u3002<\/p>\n updatePriority<\/strong> – \u540c\u3058\u3088\u3046\u306b\u3001priority\u3092\u66f4\u65b0\u3057\u305f\u3044\u6642\u306b\u547c\u3073\u51fa\u3059\u30e1\u30bd\u30c3\u30c9\u3067\u3059\u3002<\/p>\n dehydrate<\/strong> – \u57fa\u672c\u7684\u306b\u3001todo\u306e\u72b6\u614b\u3092\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306b\u4fdd\u5b58\u3059\u308b\u6642\u306b\u4f7f\u3044\u307e\u3059\u3002\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u7d42\u4e86\u6642\u306b\u5404Todo\u9805\u76ee\u306b\u5bfe\u3057\u3066\u3001\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3059\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n status\u5909\u6570\u3092synthesize\u884c\u306b\u8ffd\u52a0\u3059\u308b\u306e\u3092\u5fd8\u308c\u306a\u3044\u3088\u3046\u306b\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n \u4ee5\u524d\u884c\u3063\u305f\u306e\u3068\u540c\u69d8\u306b\u3001\u30b3\u30f3\u30d1\u30a4\u30eb\u3055\u308c\u305fdehydration\u30b9\u30c6\u30fc\u30c8\u30e1\u30f3\u30c8\u3092\u4fdd\u6301\u3059\u308b\u305f\u3081\u306b\u3001\u9759\u7684\u306asqlite3_stmt \u3092\u4f5c\u6210\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n Todo.m<\/strong> \u3092\u958b\u3044\u3066\u3001\u4ee5\u4e0b\u3092\u8ffd\u52a0\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n static<\/span> sqlite3_stmt *init_statement = nil<\/span>;<\/p>\n static<\/span> sqlite3_stmt *dehydrate_statment = nil<\/span>;<\/p>\n \n @implementation Todo<\/span><\/p>\n @synthesize<\/span> primaryKey,text,priority,status;<\/p>\n<\/blockquote>\n \u30e1\u30bd\u30c3\u30c9\u3092\u5b9f\u88c5\u3057\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n – (void<\/span>)updateStatus:(NSInteger<\/span>)newStatus {<\/p>\n <\/span>self<\/span>.status<\/span> = newStatus;<\/p>\n <\/span>dirty<\/span> = YES<\/span>;<\/p>\n <\/span><\/p>\n }<\/p>\n \n – (void<\/span>)updatePriority:(NSInteger<\/span>)newPriority {<\/p>\n <\/span>self<\/span>.priority<\/span> = newPriority;<\/p>\n <\/span>dirty<\/span> = YES<\/span>;<\/p>\n }<\/p>\n \n – (void<\/span>) dehydrate {<\/p>\n <\/span>if<\/span>(dirty<\/span>) {<\/p>\n <\/span><\/p>\n <\/span><\/span>if<\/span> (<\/span>dehydrate_statment == <\/span>nil<\/span>) {<\/span><\/p>\n <\/span><\/span>const<\/span> <\/span>char<\/span> *sql = <\/span>“UPDATE todo SET priority = ?,complete = ? WHERE pk=?”;<\/span><\/p>\n <\/span>if<\/span> (sqlite3_prepare_v2<\/span>(database<\/span>, sql, –1<\/span>, &dehydrate_statment<\/span>, NULL<\/span>) != SQLITE_OK<\/span>) {<\/p>\n <\/span><\/span>NSAssert1<\/span>(<\/span>0<\/span>, <\/span>@”Error: failed to prepare statement with message ‘%s’.”, <\/span>sqlite3_errmsg<\/span>(<\/span>database<\/span>));<\/span><\/p>\n <\/span>}<\/p>\n <\/span>}<\/p>\n <\/span><\/p>\n <\/span><\/span>sqlite3_bind_int<\/span>(<\/span>dehydrate_statment, <\/span>3<\/span>, <\/span>self<\/span>.<\/span>primaryKey);<\/span><\/p>\n <\/span><\/span>sqlite3_bind_int<\/span>(<\/span>dehydrate_statment, <\/span>2<\/span>, <\/span>self<\/span>.<\/span>status);<\/span><\/p>\n <\/span><\/span>sqlite3_bind_int<\/span>(<\/span>dehydrate_statment, <\/span>1<\/span>, <\/span>self<\/span>.<\/span>priority);<\/span><\/p>\n <\/span><\/span>int<\/span> success = <\/span>sqlite3_step<\/span>(<\/span>dehydrate_statment);<\/span><\/p>\n <\/span><\/p>\n <\/span>if<\/span> (success != SQLITE_DONE<\/span>) {<\/p>\n <\/span><\/span>NSAssert1<\/span>(<\/span>0<\/span>, <\/span>@”Error: failed to save priority with message ‘%s’.”, <\/span>sqlite3_errmsg<\/span>(<\/span>database<\/span>));<\/span><\/p>\n <\/span>}<\/p>\n <\/span><\/p>\n <\/span><\/span>sqlite3_reset<\/span>(<\/span>dehydrate_statment);<\/span><\/p>\n <\/span>dirty<\/span> = NO<\/span>;<\/p>\n <\/span>}<\/p>\n <\/span><\/p>\n }<\/p>\n \n @end<\/p>\n<\/blockquote>\n \u6700\u521d\u306e\u4e8c\u3064\u306e\u30e1\u30bd\u30c3\u30c9(udpateStatus \u3068 updatePriority)\u306f\u3001\u5206\u304b\u308a\u3084\u3059\u3044\u3067\u3059\u3002\u3053\u308c\u3089\u306f\u3001todo\u306epriority\u3068status\u3092\u66f4\u65b0\u3057\u3001dirty\u30d7\u30ed\u30d1\u30c6\u30a3\u3092 1 \u306b\u8a2d\u5b9a\u3057\u307e\u3059\u3002<\/p>\n \u3053\u308c\u306f\u3001todo\u304c\u5909\u66f4\u3055\u308c\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306b\u4fdd\u5b58\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u3068\u3044\u3046\u5370\u3067\u3059\u3002<\/p>\n \u6700\u5f8c\u306b\u3001dehydrate \u30e1\u30bd\u30c3\u30c9\u3067\u3059\u3002\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u7d42\u4e86\u6642\u306b\u5404todo\u306b\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3057\u307e\u3059\u3002dirty \u30d7\u30ed\u30d1\u30c6\u30a3\u304cYES\u306a\u3089\u3001\u65b0\u3057\u3044\u30c7\u30fc\u30bf\u3092\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306b\u767b\u9332\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n \u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306e\u30b3\u30fc\u30c9\u306f\u3001\u524d\u306e\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u306e\u30b3\u30fc\u30c9\u306b\u4f3c\u3066\u3044\u307e\u3059\u3002\u307e\u305a\u3001dehydrate_statement \u304c nil \u304b\u3069\u3046\u304b\u8abf\u3079\u307e\u3059\u3002<\/p>\n \u3053\u308c\u306f\u3001\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u304c\u547c\u3073\u51fa\u3055\u308c\u305f\u6700\u521d\u306e\u6642\u3060\u3051\u306b\u5b9f\u884c\u3055\u308c\u307e\u3059\u3002<\/p>\n \u6b21\u306b\u3001update\u6587\u3092\u4f5c\u6210\u3057\u3001bind \u306b\u3088\u3063\u3066\u5404\u201d\uff1f\u201d\u306b\u5909\u6570\u3092\u3042\u3066\u306f\u3081\u307e\u3059\u3002\u6ce8\u610f\u3059\u3079\u304d\u306f\u3001\u6570\u5b57\u304c\u3001\u5de6\u304b\u3089\u53f3\u3078\u201d\uff1f\u201d\u306e\u756a\u53f7\u3092\u8868\u3057\u3066\u3044\u308b\u3053\u3068\u3067\u3059\u3002<\/p>\n \u6700\u5f8c\u306b\u3001sqlite3_step\u3092\u547c\u3073\u51fa\u3057\u3066\u3001SQLite\u30b9\u30c6\u30fc\u30c8\u30e1\u30f3\u30c8\u3092\u5b9f\u884c\u3057\u3001\u305d\u3057\u3066\u3001\u30b9\u30c6\u30fc\u30c8\u30e1\u30f3\u30c8\u3092\u30ea\u30bb\u30c3\u30c8\u3057\u307e\u3059\u3002<\/p>\n Todo.m<\/strong> \u3067\u6700\u5f8c\u306b\u3059\u308b\u306e\u306f\u3001complete\u30d5\u30a3\u30fc\u30eb\u30c9\u3092\u53d6\u5f97\u3059\u308b\u305f\u3081\u306b\u3001initWithPrimaryKey \u30e1\u30bd\u30c3\u30c9\u5185\u306eSELECT\u6587\u3092\u5909\u66f4\u3059\u308b\u3053\u3068\u3067\u3059\u3002<\/p>\n \u4ee5\u4e0b\u306e\u3088\u3046\u306b\u30b3\u30fc\u30c9\u3092\u5909\u66f4\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n @synthesize<\/span> primaryKey,text,priority,status;<\/p>\n \n – (id<\/span>)initWithPrimaryKey:(NSInteger<\/span>)pk database:(sqlite3<\/span> *)db {<\/p>\n\n
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