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