FMDB数据库使用

FMDatabase 数据库

1. 下载 FMDatabase

    https ://github.com/ccgus/ fmdb

    导入下载里面的 src 文件，删了 fmdb .m文件

2. 引入 framework:libsqlite3. dylib

3. 引入头文件

    #import " FMDatabase.h ”

    数据库文件要兼容 iPhone4 和 iPhone5 需要放在 Document 或 Library 目录中 , 先判断 Document/Library 中数据库文件 ( 一般是 . sqlite 后缀 ) 是否存在 , 如果不存在则从 工程 (bundle) 中把数据库文件拷贝到 Document 中或 Library 中。

以下是我是我工程中用过的一个数据库操作代码，记下来，免得忘记了：

//数据库操作，1代表增减，2代表删除，3，代表查询，4，代表修改
-(void)operateDB:(NSInteger)num andRow:(NSInteger)row status:(NSInteger)status{
    self.deleteOld = YES;
    self.dbFile = @"shopCar_db.sqlite";
    NSFileManager *manager = [NSFileManager defaultManager];
    NSString *dbPath = [Utilities documentsPath:self.dbFile];
    
    //没存在则拷贝到document
    if (![manager fileExistsAtPath:dbPath]) {
        NSString *bundlePath = [Utilities bundlePath:self.dbFile];
        if ([manager copyItemAtPath:bundlePath toPath:dbPath error:nil]) {
            NSLog(@"copy ok...");
        }
        else
        {
            NSLog(@"copy error...");
        }
    }
    else{
        if (self.deleteOld) {
            NSLog(@"delete old and create new..");
            NSString *bundlePath = [Utilities bundlePath:self.dbFile];
            [manager removeItemAtPath:dbPath error:nil];
            [manager copyItemAtPath:bundlePath toPath:dbPath error:nil];
        }
        else
        {
            NSLog(@"do nothing...");
        }
        
    }
    
    
    FMDatabase *db = [FMDatabase databaseWithPath:dbPath];
    NSLog(@"begin to db...");
    if ([db open]) {
        if(status == 1){
            NSLog(@"增减.......");
        }
        if(status == 2){
            NSString *sql = [NSString stringWithFormat:@"delete from shopCar_tb where id = %i",row];
            [db executeUpdate:sql];
        }
        if(status == 3){
            NSLog(@"查询........");
        }
        if(status == 4){
            NSString *sql = [NSString stringWithFormat:@"UPDATE shopCar_tb SET num = '%d' WHERE id = %d",num,row];
            [db executeUpdate:sql];
        }
        NSString *sql = @"select * from shopCar_tb";
        FMResultSet *result = [db executeQuery:sql];
        _mutableArrayData = [[NSMutableArray alloc] init];
        [_mutableArrayData removeAllObjects];
        [_mutableDictionayData removeAllObjects];
        while ([result next]) {
            _mutableDictionayData = [[NSMutableDictionary alloc] init];
            NSString *sid = [result stringForColumn:@"id"];
            [_mutableDictionayData setObject:sid forKey:@"id"];
            
            NSString *name = [result stringForColumn:@"name"];
            [_mutableDictionayData setObject:name forKey:@"name"];
            
            NSString *gid = [result stringForColumn:@"gid"];
            [_mutableDictionayData setObject:gid forKey:@"gid"];
            
            NSString *num = [result stringForColumn:@"num"];
            [_mutableDictionayData setObject:num forKey:@"num"];
            NSLog(@"num = %i",[num intValue]);
            
            NSString *price = [result stringForColumn:@"price"];
            [_mutableDictionayData setObject:price forKey:@"price"];
            
            NSString *path = [result stringForColumn:@"path"];
            [_mutableDictionayData setObject:path forKey:@"path"];
            
            [_mutableArrayData addObject:_mutableDictionayData];
        }
        
    }
    [db close];
    
    NSLog(@"end db...");
    
    
}

FMDB数据库使用说明连接： http://www.highoncoding.com/Articles/836_Persisting_iOS_Application_Data_in_SQLite_Database_Using_FMDB.aspx