简介:
SQLite (http://www.sqlite.org/docs.html) 是一个轻量级的关系数据库。iOS SDK 很早就支持了 SQLite，在使用时，只需要加入 libsqlite3.dylib 依赖以及引入 sqlite3.h 头文件即可。但是，原生的 SQLite API 在使用上相当不友好，在使用时，非常不便。于是，开源社区中就出现了一系列将 SQLite API 进行封装的库，而 FMDB (https://github.com/ccgus/fmdb) 则是开源社区中的优秀者。
使用: (BESTAccountsManager 为账号数据管理分类, BESTAccountItem 为账号模型)
static FMDatabase *_db;
static BESTAccountsManager *sharedManager = nil;
// 单例
+ (instancetype)sharedManager {
@synchronized (self) {
if (sharedManager == nil) {
sharedManager = [[BESTAccountsManager alloc] init];
}
}
return sharedManager;
}
// 打开数据库
- (void)openAccountManager {
NSString *path = [[NSSearchPathForDirectoriesInDomains(NSDocumentationDirectory, NSUserDomainMask, YES) lastObject] stringByAppendingPathComponent:@"AccountManager.db"];
_db = [FMDatabase databaseWithPath:path];
if ([_db open]) {
BOOL res = [[BESTAccountsManager sharedManager] createTable];
if (!res) {
NSLog(@"create table Accounts failed!");
}
}
}
// 创建数据库
- (BOOL)createTable {
NSString *sql = [NSString stringWithFormat:@"CREATE TABLE IF NOT EXISTS ‘Account‘(‘id‘ PRIMARY KEY AUTOINCREMENT NOT NULL, ‘UserName‘ TEXT NOT NULL, ‘Password‘ TEXT NOT NULL, ‘Host‘ TEXT NOT NULL)"];
return [_db executeUpdate:sql];
}
// 增
- (void)insertAccountItem:(BESTAccountItem *)item {
if ([_db open]) {
NSString *sql = [NSString stringWithFormat:@"INSERT INTO ‘Account‘ (‘UserName‘, ‘Password‘, ‘Host‘) VALUES (‘%@‘, ‘%@‘, ‘%@‘)", item.userName, item.password, item.host];
BOOL res = [_db executeUpdate:sql];
if (res) {
NSLog(@"insert account item succeed!");
} else {
NSLog(@"insert account item failed!");
}
}
[_db close];
}
// 删
- (void)deleteAccountItem:(BESTAccountItem *)item {
if ([_db open]) {
NSString *sql = [NSString stringWithFormat:@"DELETE FROM ‘Account‘ WHERE ‘UserName‘ = ‘%@‘ AND ‘Host‘ = ‘%@‘", item.userName, item.host];
BOOL res = [_db executeUpdate:sql];
if (res) {
NSLog(@"delete account item succeed!");
} else {
NSLog(@"delete account item failed!");
}
}
[_db close];
}
// 改
- (void)updataAccountItem:(BESTAccountItem *)item {
if ([_db open]) {
NSString *sql = [NSString stringWithFormat:@"UPDATE ‘Account‘ SET ‘Password‘ = ‘%@‘ WHERE ‘UserName‘ = ‘%@‘ AND ‘Host‘ = ‘%@‘", item.password, item.userName, item.host];
BOOL res = [_db executeUpdate:sql];
if (res) {
NSLog(@"update account item succeed!");
} else {
NSLog(@"update account item failed!");
}
}
[_db close];
}
// 查
- (NSArray *)queryAccountItems {
NSMutableArray *accounts = [NSMutableArray array];
if ([_db open]) {
NSString *sql = [NSString stringWithFormat:@"SELECT * FROM ‘Account‘"];
FMResultSet *set = [_db executeQuery:sql];
while ([set next]) {
BESTAccountItem *item = [[BESTAccountItem alloc] init];
item.userName = [set stringForColumn:@"UserName"];
item.password = [set stringForColumn:@"Password"];
item.host = [set stringForColumn:@"Host"];
[accounts addObject:item];
}
}
[_db close];
return accounts;
}