ios 通过第三方FMDB来读取db数据库的数据

第一步：在新建项目中把FMDB类库加进项目中，如图：



第二步：将做好的.db数据库放到以下目录中：

/Users/apple/Library/Application Support/iPhone Simulator/6.1/Applications/06A47F8B-23EA-48D5-80A5-54CF37D0D8B8/Documents/TCFexam.db
数据库如图：




第三步：输入以下代码：
//
// TextOneViewController.m
// TCFExamTextOne
//
// Created by apple on 13-7-13.
// Copyright (c) 2013年 apple. All rights reserved.
//

#import "TextOneViewController.h"
#import "FMDatabase.h"
#import "FMResultSet.h"

@interface TextOneViewController ()

@end

@implementation TextOneViewController

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}

- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view from its nib.
}

- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}

- (IBAction)DidSearch:(id)sender
{
NSArray* paths = NSSearchPathForDirectoriesInDomains( NSDocumentDirectory , NSUserDomainMask , YES );
NSString* documentPath = [ paths objectAtIndex: 0 ];

NSString* dbPath = [ documentPath stringByAppendingPathComponent: @"TCFexam.db" ];

FMDatabase* database = [ FMDatabase databaseWithPath: dbPath ];
if ( ![ database open ] )
{
return;
}

// 查找表 AllTheQustions
FMResultSet* resultSet = [ database executeQuery: @"select * from AllTheQustions" ];

// 逐行读取数据
while ( [ resultSet next ] )
{
// 对应字段来取数据
NSString* history = [ resultSet stringForColumn: @"History" ];
NSString* question = [ resultSet stringForColumn: @"Question" ];
NSLog( @"history: %@ , question: %@" , history , question );
}

[ database close ];

}
@end

第四步：输出效果如下：