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该文件是对对象类型进行encoding 以及 decoding操作的方法
1. 该文件是 sqlite3 单例数据库对Model 对象进行增.删.查.改
1. 而Model文件夹下面的TestModel 则是继承自Model 的一种自定义model (也就是我们项目中的自定义的Model),
2.如此,我们自己项目中的自定义model 只要继承字Model 类就可以了,
3.但还要在自定义的TestModel中添加以下改动: self.ID属性是从父类Model中继承来的 而Model 的ID属性被设置为数据库的主键, 因此不可以为空,需要将TestModel的一个属性替代ID属性,既作为主键;
.h文件
.m文件
#import "NSObject+NSCoding.h"
#import <objc/runtime.h>
#import <UIKit/UIKit.h>
@implementation NSObject (NSCoding)
- (NSMutableDictionary *)propertiesForClass:(Class)klass {
NSMutableDictionary *results = [[NSMutableDictionary alloc] init];
unsigned int outCount, i;
//通过运行时获取 该类所有属性列表
objc_property_t *properties = class_copyPropertyList(klass, &outCount);
for(i = 0; i < outCount; i++) {
objc_property_t property = properties[i];
NSString *pname = [NSString stringWithCString:property_getName(property) encoding:NSUTF8StringEncoding];
NSString *pattrs = [NSString stringWithCString:property_getAttributes(property) encoding:NSUTF8StringEncoding];
pattrs = [[pattrs componentsSeparatedByString:@","] objectAtIndex:0];
pattrs = [pattrs substringFromIndex:1];
[results setObject:pattrs forKey:pname];
}
free(properties);
if ([klass superclass] != [NSObject class]) {
[results addEntriesFromDictionary:[self propertiesForClass:[klass superclass]]];
}
return results;
}
- (NSDictionary *)properties {
return [self propertiesForClass:[self class]];
}
- (void)autoEncodeWithCoder:(NSCoder *)coder {
NSDictionary *properties = [self properties];
for (NSString *key in properties) {
NSString *type = [properties objectForKey:key];
id value;
unsigned long long ullValue;
BOOL boolValue;
float floatValue;
double doubleValue;
NSInteger intValue;
unsigned long ulValue;
long longValue;
unsigned unsignedValue;
short shortValue;
NSString *className;
NSMethodSignature *signature = [self methodSignatureForSelector:NSSelectorFromString(key)];
NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:signature];
[invocation setSelector:NSSelectorFromString(key)];
[invocation setTarget:self];
switch ([type characterAtIndex:0]){
case ‘@‘: // object
if ([[type componentsSeparatedByString:@"\""] count] > 1) {
className = [[type componentsSeparatedByString:@"\""] objectAtIndex:1];
Class class = NSClassFromString(className);
#warning UIImage类型的属性不归档 add by yhy›
if ([className isEqualToString:@"UIImage"]) {
//如果属性是UIImage类型的，不进行归档
break;
}
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Warc-performSelector-leaks"
value = [self performSelector:NSSelectorFromString(key)];
#pragma clang diagnostic pop
// only decode if the property conforms to NSCoding
if([class conformsToProtocol:@protocol(NSCoding)]){
[coder encodeObject:value forKey:key];
}
}
break;
case ‘c‘: // bool
[invocation invoke];
[invocation getReturnValue:&boolValue];
[coder encodeObject:[NSNumber numberWithBool:boolValue] forKey:key];
break;
case ‘f‘: // float
[invocation invoke];
[invocation getReturnValue:&floatValue];
[coder encodeObject:[NSNumber numberWithFloat:floatValue] forKey:key];
break;
case ‘d‘: // double
[invocation invoke];
[invocation getReturnValue:&doubleValue];
[coder encodeObject:[NSNumber numberWithDouble:doubleValue] forKey:key];
break;
case ‘i‘: // int
[invocation invoke];
[invocation getReturnValue:&intValue];
[coder encodeObject:[NSNumber numberWithInt:(int)intValue] forKey:key];
break;
case ‘L‘: // unsigned long
[invocation invoke];
[invocation getReturnValue:&ulValue];
[coder encodeObject:[NSNumber numberWithUnsignedLong:ulValue] forKey:key];
break;
case ‘Q‘: // unsigned long long
[invocation invoke];
[invocation getReturnValue:&ullValue];
[coder encodeObject:[NSNumber numberWithUnsignedLongLong:ullValue] forKey:key];
break;
case ‘l‘: // long
[invocation invoke];
[invocation getReturnValue:&longValue];
[coder encodeObject:[NSNumber numberWithLong:longValue] forKey:key];
break;
case ‘s‘: // short
[invocation invoke];
[invocation getReturnValue:&shortValue];
[coder encodeObject:[NSNumber numberWithShort:shortValue] forKey:key];
break;
case ‘I‘: // unsigned
[invocation invoke];
[invocation getReturnValue:&unsignedValue];
[coder encodeObject:[NSNumber numberWithUnsignedInt:unsignedValue] forKey:key];
break;
default:
break;
}
}
}
- (void)autoDecode:(NSCoder *)coder {
NSDictionary *properties = [self properties];
for (NSString *key in properties) {
NSString *type = [properties objectForKey:key];
id value;
NSNumber *number;
NSInteger i;
CGFloat f;
BOOL b;
double d;
unsigned long ul;
unsigned long long ull;
long longValue;
unsigned unsignedValue;
short shortValue;
NSString *className;
switch ([type characterAtIndex:0]) {
case ‘@‘: // object
if ([[type componentsSeparatedByString:@"\""] count] > 1) {
className = [[type componentsSeparatedByString:@"\""] objectAtIndex:1];
Class class = NSClassFromString(className);
#warning UIImage类型的属性不归档 add by yhy
if ([className isEqualToString:@"UIImage"]) {
//如果属性是UIImage类型的，不进行反归档
break;
}
// only decode if the property conforms to NSCoding
if ([class conformsToProtocol:@protocol(NSCoding )]){
value = [coder decodeObjectForKey:key];
[self setValue:value forKey:key];
}
}
break;
case ‘c‘: // bool
number = [coder decodeObjectForKey:key];
b = [number boolValue];
[self setValue:@(b) forKey:key];
break;
case ‘f‘: // float
number = [coder decodeObjectForKey:key];
f = [number floatValue];
[self setValue:@(f) forKey:key];
break;
case ‘d‘: // double
number = [coder decodeObjectForKey:key];
d = [number doubleValue];
[self setValue:@(d) forKey:key];
break;
case ‘i‘: // int
number = [coder decodeObjectForKey:key];
i = [number intValue];
[self setValue:@(i) forKey:key];
break;
case ‘L‘: // unsigned long
number = [coder decodeObjectForKey:key];
ul = [number unsignedLongValue];
[self setValue:@(ul) forKey:key];
break;
case ‘Q‘: // unsigned long long
number = [coder decodeObjectForKey:key];
ull = [number unsignedLongLongValue];
[self setValue:@(ull) forKey:key];
break;
case ‘l‘: // long
number = [coder decodeObjectForKey:key];
longValue = [number longValue];
[self setValue:@(longValue) forKey:key];
break;
case ‘I‘: // unsigned
number = [coder decodeObjectForKey:key];
unsignedValue = [number unsignedIntValue];
[self setValue:@(unsignedValue) forKey:key];
break;
case ‘s‘: // short
number = [coder decodeObjectForKey:key];
shortValue = [number shortValue];
[self setValue:@(shortValue) forKey:key];
break;
default:
break;
}
}
}
@end
.h文件
.m文件
#import <sqlite3.h>
#import "DatabaseHandle.h"
#import "Model.h"
#define ARCHIVERKEY @"archiver"
static DatabaseHandle *dataHandle =nil;
@implementation DatabaseHandle
+ (DatabaseHandle*)shardInstnce{
@synchronized(self){
if (dataHandle == nil) {
dataHandle = [[DatabaseHandle alloc]init];
}
return dataHandle;
}
}
//打开数据库
static sqlite3 *db = nil;
- (void)openDB{
if (db !=nil) {
return;
}
NSString *filePath = [self useCachesPathSqlite:@"WatchBall.sqlite"];
NSLog(@"db filePath = %@",filePath);
int result = sqlite3_open(filePath.UTF8String, &db);
if (result ==SQLITE_OK) {
NSString *createModelSql = @"CREATE TABLE ModelList(ID TEXT PRIMARY KEY,title TEXT,imageUrl TEXT,data BLOB)";
//执行参数?
sqlite3_exec(db, [createModelSql UTF8String], NULL, NULL, NULL);
}
}
- (void)closeDB{
int result = sqlite3_close(db);
if (result ==SQLITE_OK) {
db = nil;
NSLog(@"关闭成功");
}
}
//插入收藏活动
- (void)insertNewactivity:(Model *)model{
[self openDB];
static sqlite3_stmt *stmt = nil;
NSString *sql = @"insert into ModelList(ID,title,imageUrl,data) values (?,?,?,?)";
int result = sqlite3_prepare_v2(db, sql.UTF8String, -1, &stmt, nil);
if (result ==SQLITE_OK) {
sqlite3_bind_text(stmt, 1, [model.ID UTF8String], -1, nil);
sqlite3_bind_text(stmt, 2, [model.title UTF8String], -1, nil);
sqlite3_bind_text(stmt, 3, [model.imageUrl UTF8String], -1, nil);
NSString *archiverKey = [NSString stringWithFormat:@"%@%@",ARCHIVERKEY,model.ID];
NSData *data = [self dataOfArchiverObject:model forKey:archiverKey];
sqlite3_bind_blob(stmt, 4, [data bytes], (int)[data length], nil);
sqlite3_step(stmt);
}
sqlite3_finalize(stmt);
}
- (void)deleteModelByID:(NSString *)ID{
[self openDB];
NSString *deleteSQL = [NSString stringWithFormat:@"delete from ModelList where ID =‘%@‘",ID];
char * error =nil;
int result = sqlite3_exec(db, deleteSQL.UTF8String, NULL, NULL, &error);
if (result == SQLITE_OK) {
NSLog(@"删除成功");
}else{
NSLog(@"删除失败 error = %s",error);
}
}
- (Model*)selectModelWithID:(NSString *)ID{
[self openDB];
sqlite3_stmt *stmt = nil;
NSString *sql = @"select data from ModelList where ID = ?";
int result = sqlite3_prepare_v2(db, [sql UTF8String], -1, &stmt, NULL);
Model *model = nil;
if (result ==SQLITE_OK) {
sqlite3_bind_text(stmt, 1, [ID UTF8String], -1, NULL);
if (sqlite3_step(stmt) ==SQLITE_ROW) {
NSData *data = [NSData dataWithBytes:sqlite3_column_blob(stmt, 0) length:sqlite3_column_bytes(stmt, 0)];
NSString *archiver = [NSString stringWithFormat:@"%@%@",ARCHIVERKEY,ID];
model = [self unarchiverObject:data forKey:archiver];
}
}
sqlite3_finalize(stmt);
return model;
}
- (NSArray*)selectAllModel{
[self openDB];
sqlite3_stmt *stmt = nil;
NSString *sql = @"select ID,data from ModelList";
int result = sqlite3_prepare_v2(db, [sql UTF8String], -1, &stmt, NULL);
NSMutableArray *activityArray = [NSMutableArray array];
if (result == SQLITE_OK) {
while (sqlite3_step(stmt) ==SQLITE_ROW) {
NSString *ID = [NSString stringWithUTF8String:(const char*)sqlite3_column_text(stmt, 0)];
NSData *data = [NSData dataWithBytes:sqlite3_column_blob(stmt, 1) length:sqlite3_column_bytes(stmt, 1)];
NSString *modelKey = [NSString stringWithFormat:@"%@%@",ARCHIVERKEY,ID];
Model * model = [self unarchiverObject:data forKey:modelKey];
[activityArray addObject:model];
NSLog(@"%@",model);
}
}
sqlite3_finalize(stmt);
if (activityArray.count ==0) {
return nil;
}
return activityArray;
}
- (BOOL)isFavoriteModelWithID:(NSString *)ID{
Model *model = [self selectModelWithID:ID];
if (model ==nil) {
NSLog(@"没有收藏该条目");
return NO;
}
NSLog(@"已经收藏");
return YES;
}
#pragma ---文件路径处理----
////文件夹路径处理
- (NSString*)useCachesPathSqlite:(NSString*)databaseName{
NSString *caches = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES).lastObject;
NSString *filePath = [caches stringByAppendingPathComponent:databaseName];
return filePath;
}
#pragma ---归档处理---
- (NSData *)dataOfArchiverObject:(id)object forKey:(NSString*)key{
NSMutableData *data = [NSMutableData data];
NSKeyedArchiver *archiver = [[NSKeyedArchiver alloc]initForWritingWithMutableData:data];
[archiver encodeObject:object forKey:key];
[archiver finishEncoding];
return data;
}
- (id)unarchiverObject:(NSData*)data forKey:(NSString *)key{
NSKeyedUnarchiver *unarchiver = [[NSKeyedUnarchiver alloc]initForReadingWithData:data];
id object = [unarchiver decodeObjectForKey:key];
[unarchiver finishDecoding];
return object;
}
@end
.h文件
.m文件
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原文地址：http://www.cnblogs.com/zhouyubo/p/4555754.html
