將NSMutable數組傳遞到Sqlite3

我有一個NSMutable數組，用於保存通過iphone從外部傳感器捕獲的數據。我想將該數組轉儲到另一個文件中的數據庫中。我不知道它是如何完成的。將NSMutable數組傳遞到Sqlite3

Database類

- (id) init { 
    self = [super init]; 

    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,  NSUserDomainMask, YES); 
    NSString *documentsDirecotry = [paths objectAtIndex:0]; 
    NSString *databaseFilePath = [documentsDirecotry stringByAppendingPathComponent:@"ForceGaugeDatabase"]; 

    BOOL databaseExists = [[NSFileManager defaultManager] fileExistsAtPath:databaseFilePath]; 
    database = [[FMDatabase alloc] initWithPath:databaseFilePath]; 
    if(!databaseExists){ 
     [self createDatabase]; 
    } 
    return self; 
} 


-(void) createDatabase{ 

    [database open]; 

    NSString *query = [NSString stringWithString:@"CREATE TABLE forcegauge (forcelb INTEGER, forcekg INTEGER, forcenewton INTEGER, forceoz INTEGER, analoginput INTEGER);"]; 
    if([database executeUpdate:query]) { 

     for(int i = 0; i < 6 ; i++) { 
      query = [NSString stringWithFormat:@"insert into forcegauge (forcelb, forcekg, forcenewton, forceoz, analoginput) values (%d,20,30,40,100,9);", i]; 
      [database executeUpdate:query]; 

      query = [NSString stringWithFormat:@"insert into forcegauge (forcelb, forcekg, forcenewton, forceoz, analoginput) values (%d,34,45,55,90,2);", i]; 
      [database executeUpdate:query]; 

      query = [NSString stringWithFormat:@"insert into forcegauge (forcelb, forcekg, forcenewton, forceoz, analoginput) values (%d,35,55,65,95,3);", i]; 
      [database executeUpdate:query]; 

      query = [NSString stringWithFormat:@"insert into forcegauge (forcelb, forcekg, forcenewton, forceoz, analoginput) values (%d,40, 53, 67,90,4);", i]; 
      [database executeUpdate:query]; 
     } 
    } else { 
     NSLog(@"Error Creating Table"); 
    } 
    [database close];  
}

類帶的NSMutableArray。

-(void) forceCalculationKg{ 
    NSNumber *number = [controller. analogInValues objectAtIndex:0]; 
    [controller enableDigitalInputs:YES]; 
    double value = [number doubleValue]; 
    double force; 
    force = 0.2908 *pow(2.718,(1.2089 * value)); 
    double forcekg; 
    forcekg = force/2.2; 
    [kgarray addObject:[NSNumber numberWithDouble:forcekg]]; 

    forceoutput.text = [NSString stringWithFormat:@" %0.1f", forcekg]; 
}

因此，這裏kgarray包含所有通過連接的外部傳感器進行更新的數據。我想將由kgarray保存的數據傳輸到ForceGaugeDatabase。

來源

2011-08-05 ilaunchpad

是否要更新表中的現有行或插入新行？在您的代碼片段中，您已經有了一個如何將新行插入到表中的示例。 –

@lunatic我想插入新的表格。那些插入僅僅是一個測試。但是我在另一個類中有五個NSMutable數組，它們擁有從外部傳感器捕獲的不同值，並且它們現在都擁有雙打。所以我必須將其解壓縮爲NSNumber並將其存儲到變量中。我不知道如何將這些NSNumbers傳遞到數據庫中。 – ilaunchpad

要將數組中的行插入到表中，需要遍歷數組並執行查詢。

NSUInteger totalRows = [firstArray count]; // I suppose, that each array has the same number of items 
for (NSUInteger i = 0; i < totalRows; ++i) { 
    NSNumber *forcelb = [firstArray objectAtIndex:i]; 
    NSNumber *forcekg = [secondArray objectAtIndex:i]; 
    ..... 
    NSString *query = [NSString stringWithFormat:@"insert into forcegauge (forcelb, forcekg, forcenewton, forceoz, analoginput) values (%f , %f, 53, 67,90,4);", [forcelb doubleValue], [forcekg doubleValue]]; 
    [database executeUpdate:query]; 
}

來源

2011-08-05 19:30:32

將NSMutable數組傳遞到Sqlite3

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