FMDB基本使用

1.打開資料庫

#import "ViewController.h"
#import "FMDB.h"


@interface ViewController ()

@property (nonatomic, strong) FMDatabase *db;

@end

@implementation ViewController





- (void)viewDidLoad {
    [super viewDidLoad];
    
    
    //打開資料庫
    [self dbOpen];


}


/**
 *  打開資料庫
 */
-(void)dbOpen
{
    //1.獲取資料庫文件的路徑
    NSString *doc=[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
    
    NSString *fileName=[doc stringByAppendingPathComponent:@"toothGroup.sqlite"];
    
    NSLog(@"%@",fileName);
    
    
    //2.獲得資料庫
    FMDatabase *db=[FMDatabase databaseWithPath:fileName];
   

    //3.打開資料庫
    if ([db open]) {
        
        //創建表的時候必須要有一個integer類型的，否則創建不成功
        
        NSString *create=@"create table if not exists t_group11(id integer primary key autoincrement,filename text NOT NULL,title text NOT NULL,price text NOT NULL,endTime text NOT NULL)";
        
        
        BOOL result=[db executeUpdate:create];
       
        
        if (result) {
            NSLog(@"創表成功");
        }
        else
        {
            NSLog(@"創表失敗");
        }
        
    }
    
    self.db=db;
}

2.插入數據

  //往資料庫插入數據 緩存數據
                if ([self.db open]) {
                
                NSString *sql=[NSString stringWithFormat: @"INSERT INTO t_group11 (filename,title,price,endTime) VALUES('%@','%@','%@','%@')",dict[@"filename"],dict[@"title"],dict[@"price"],dict[@"endTime"]];
                    
                    BOOL result=[self.db executeUpdate:sql];
                   
                    
                    if (result) {
                        NSLog(@"插入成功");
                    }
                    else
                    {
                        NSLog(@"插入失敗");
                    }
                    
                }
                

3.查詢數據

 // 1.執行查詢語句
    FMResultSet *resultSet = [self.db executeQuery:@"SELECT * FROM t_group11"];
    
    // 2.遍歷結果
        while ([resultSet next]) {
                 int ID = [resultSet intForColumn:@"id"];
            
            NSString *filename=[resultSet stringForColumn:@"filename"];
            NSString *title=[resultSet stringForColumn:@"title"];
             NSString *price=[resultSet stringForColumn:@"price"];
             NSString *endTime=[resultSet stringForColumn:@"endTime"];
            
                NSLog(@"%d %@ %@ %@ %@", ID, filename, title,price,endTime);
            }

4.刪除數據，表

 //刪除表
            [self.db executeUpdate:@"DROP TABLE IF EXISTS t_group11"];