iOS持久化

/* Returns the default singleton instance.*/
+ (NSFileManager *)defaultManager;

- (BOOL)createDirectoryAtPath:(NSString *)path withIntermediateDirectories:(BOOL)createIntermediates attributes:(NSDictionary *)attributes error:(NSError **)error;

- (NSArray *)contentsOfDirectoryAtPath:(NSString *)path error:(NSError **)error;

- (BOOL)copyItemAtPath:(NSString *)srcPath toPath:(NSString *)dstPath error:(NSError **)error;
- (BOOL)moveItemAtPath:(NSString *)srcPath toPath:(NSString *)dstPath error:(NSError **)error;
- (BOOL)linkItemAtPath:(NSString *)srcPath toPath:(NSString *)dstPath error:(NSError **)error;
- (BOOL)removeItemAtPath:(NSString *)path error:(NSError **)error;

@interface Address : NSObject<NSCoding>{
    NSString *country;
    NSString *city;
}
@property(nonatomic,copy) NSString *country;
@property(nonatomic,copy) NSString *city;
@end
//////////////////////////////////////////////////////
#import "Address.h"

@implementation Address
@synthesize country;
@synthesize city;

- (void)encodeWithCoder:(NSCoder *)aCoder{
    [aCoder encodeObject:country forKey:@"country"];
    [aCoder encodeObject:city forKey:@"city"];
}

- (id)initWithCoder:(NSCoder *)aDecoder{
    if (self = [super init]) {
        [self setCountry:[aDecoder decodeObjectForKey:@"country"]];
        [self setCity:[aDecoder decodeObjectForKey:@"city"]];
    }
    return self;
}

@end

#import <Foundation/Foundation.h>
#import "Address.h"
@interface User : NSObject<NSCoding>{
    NSString *_name;
    NSString *_password;

    Address *_address;
}
@property(nonatomic,copy) NSString *name;
@property(nonatomic,copy) NSString *password;
@property(nonatomic,retain) Address *address;

@end
/////////////////////////////////////////////////////////
#import "User.h"

@implementation User
@synthesize name = _name;
@synthesize password = _password;
@synthesize address = _address;

- (void)encodeWithCoder:(NSCoder *)aCoder{
    [aCoder encodeObject:_name forKey:@"name"];
    [aCoder encodeObject:_password forKey:@"password"];
    [aCoder encodeObject:_address forKey:@"address"];
}
- (id)initWithCoder:(NSCoder *)aDecoder{
    if (self = [super init]) {
        [self setName:[aDecoder decodeObjectForKey:@"name"]];
        [self setPassword:[aDecoder decodeObjectForKey:@"password"]];
        [self setAddress:[aDecoder decodeObjectForKey:@"address"]];
    }
    return self;
}
@end

Address *myAddress = [[[Address alloc] init] autorelease];
myAddress.country = @"中国";
myAddress.city = @"杭州";
 
User *user = [[[User alloc] init] autorelease];
user.name = @"卢克";
user.password = @"lukejin";
user.address = myAddress;

[NSKeyedArchiver archiveRootObject:user toFile:@"/Users/Luke/Desktop/user"];

id object = [NSKeyedUnarchiver unarchiveObjectWithFile:@"/Users/Luke/Desktop/user"];
NSLog(@"Object Class : %@",[object class]);

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/	PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
	<key>$archiver</key>
	<string>NSKeyedArchiver</string>
	<key>$objects</key>
	<array>
		<string>$null</string>
		<dict>
			<key>$class</key>
			<dict>
				<key>CF$UID</key>
				<integer>8</integer>
			</dict>
			<key>address</key>
			<dict>
				<key>CF$UID</key>
				<integer>4</integer>
			</dict>
			<key>name</key>
			<dict>
				<key>CF$UID</key>
				<integer>2</integer>
			</dict>
			<key>password</key>
			<dict>
				<key>CF$UID</key>
				<integer>3</integer>
			</dict>
		</dict>
		<string>卢克</string>
		<string>lukejin</string>
		<dict>
			<key>$class</key>
			<dict>
				<key>CF$UID</key>
				<integer>7</integer>
			</dict>
			<key>city</key>
			<dict>
				<key>CF$UID</key>
				<integer>6</integer>
			</dict>
			<key>country</key>
			<dict>
				<key>CF$UID</key>
				<integer>5</integer>
			</dict>
		</dict>
		<string>中国</string>
		<string>杭州</string>
		<dict>
			<key>$classes</key>
			<array>
				<string>Address</string>
				<string>NSObject</string>
			</array>
			<key>$classname</key>
			<string>Address</string>
		</dict>
		<dict>
			<key>$classes</key>
			<array>
				<string>User</string>
				<string>NSObject</string>
			</array>
			<key>$classname</key>
			<string>User</string>
		</dict>
	</array>
	<key>$top</key>
	<dict>
		<key>root</key>
		<dict>
			<key>CF$UID</key>
			<integer>1</integer>
		</dict>
	</dict>
	<key>$version</key>
	<integer>100000</integer>
</dict>
</plist>

	
- (BOOL)writeToFile:(NSString *)path atomically:(BOOL)useAuxiliaryFile;

	
NSMutableDictionary *dataDictionary = [[[NSMutableDictionary alloc] init] autorelease];
 [dataDictionary setValue:[NSNumber numberWithInt:222] forKey:@"intNumber"];
 [dataDictionary setValue:[NSArray arrayWithObjects:@"1",@"2", nil] forKey:@"testArray"];
 [dataDictionary writeToFile:@"/Users/Luke/Desktop/test.plist" atomically:YES];

	
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
	<key>intNumber</key>
	<integer>222</integer>
	<key>testArray</key>
	<array>
		<string>1</string>
		<string>2</string>
	</array>
</dict>
</plist>

	   
NSDictionary *dictionaryFromFile = [NSDictionary dictionaryWithContentsOfFile:@"/Users/Luke/Desktop/test.plist"];

	   
NSMutableDictionary *dataDictionary = [[[NSMutableDictionary alloc] init] autorelease];
[dataDictionary setValue:[NSNumber numberWithInt:222] forKey:@"intNumber"];
[dataDictionary setValue:[NSArray arrayWithObjects:@"1",@"2", nil] forKey:@"testArray"];

NSString *error;
NSData *xmlData = [NSPropertyListSerialization dataFromPropertyList:dataDictionary
                                                           format:NSPropertyListXMLFormat_v1_0
                                                 errorDescription:&error];
if(xmlData) {
    NSLog(@"No error creating XML data.");
    [xmlData writeToFile:@"/Users/Luke/Desktop/test2.plist" atomically:YES];
}
else {
    if (error) {
        NSLog(@"error:%@", error);
        [error release];
    }
}

	   
	NSDictionary *dictionaryFromFile = (NSDictionary *)[NSPropertyListSerialization 
 	                                                   propertyListWithData:[NSData dataWithContentsOfFile:@"/Users/Luke/Desktop/test2.plist"] 
	                                                    options:0
	                                                    format:NULL
	                                                    error:&error];

	   
$ sqlite3 test.db
SQLite version 3.7.5
Enter ".help" for instructions
Enter SQL statements terminated with a ";"
sqlite>create table if not exists names(id integer primary key asc, name text); 
sqlite> insert into names(name) values('Luke');
sqlite> select * from names;
1|Luke
sqlite> 

	   
sqlite3 *database;//sqlite3的类型其实只是一个结构体struct
NSArray *documentsPaths=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory 
                                                         , NSUserDomainMask 
                                                         , YES); 
NSString *databaseFilePath=[[documentsPaths objectAtIndex:0] stringByAppendingPathComponent:@"luke.db"];

//打开数据库
if (sqlite3_open([databaseFilePath UTF8String], &database)==SQLITE_OK) { 
    NSLog(@"open sqlite db ok."); 
    char *errorMsg; 
    const char *createSql="create table if not exists names (id integer primary key asc,name text)";
    //创建表
    if (sqlite3_exec(database, createSql, NULL, NULL, &errorMsg)==SQLITE_OK) { 
        NSLog(@"create ok."); 
    }else {
        NSLog(@"error: %s",errorMsg); 
        sqlite3_free(errorMsg);
    }
    
    
    //插入数据
    const char *insertSql="insert into names (name) values(\"Luke\")"; 
    if (sqlite3_exec(database, insertSql, NULL, NULL, &errorMsg) == SQLITE_OK) { 
        NSLog(@"insert ok."); 
    }else {
        NSLog(@"error: %s",errorMsg); 
        sqlite3_free(errorMsg); 
    }
    
    
    const char *selectSql="select id,name from names"; 
    sqlite3_stmt *statement; 
    if (sqlite3_prepare_v2(database, selectSql, -1, &statement, nil) == SQLITE_OK) { 
        NSLog(@"select ok.");
    }
    
    while (sqlite3_step(statement)==SQLITE_ROW) { 
        int _id=sqlite3_column_int(statement, 0); 
        char *name=(char *)sqlite3_column_text(statement, 1); 
        NSString *nameString = [NSString stringWithCString:name encoding:NSUTF8StringEncoding];
        NSLog(@"row>>id %i, name %@",_id,nameString); 
    }
    
    sqlite3_finalize(statement);
    
}

sqlite3_close(database);