第一步：插入libsqlite3.tbd

插入libsqlite3.tbd

第二步：viewController.m全部代码

//
//  ViewController.m
//  FMDataBase数据库
//
//  Created by qianfeng on 16/9/25.
//  Copyright © 2016年 qianfeng. All rights reserved.
//

#import "ViewController.h"
#import "FMDB.h"
@interface ViewController ()
@end
/*
 FMDB的简单使用：
 */
@implementation ViewController

/*
 NSSearchPathForDirectoriesInDomains:查找路径，在（cache，user）下载
 NSCachesDirectory:library 的caches 快速存储目录路径
 NSUserDomainMask：用户安装目录
 YES：表示完整路径
 */
-(NSString *)databasePath
{
    NSString *cachepath = NSSearchPathForDirectoriesInDomains
(NSCachesDirectory, 
NSUserDomainMask, YES)[0];
    return [cachepath stringByAppendingPathComponent:@"data.db"];
}

- (void)viewDidLoad {
    [super viewDidLoad];
    /*
     1.创建/打开数据库
     */
    FMDatabase *database = [FMDatabase databaseWithPath:
         [self databasePath] ];
    [database open];
    NSLog(@"cachePath == %@",[self databasePath]);
    
    
    /*
     2.创建表
     */
    NSString *sql_createTable = @"create table if not exists 
book(id integer primary key autoincrement,name text ,price double)";
    [database executeUpdate:sql_createTable];
    
    
    /*
     3.插入数据
     */
    NSString *sql_insert = @"insert into book (name , price) 
                                values (?, ?)";
    for (int i = 0; i < 10;i ++ ){
        [database executeUpdate:sql_insert,
             [NSString stringWithFormat:@"name%d",i+1], @(20+i)];
    }
    

    /*
     4.查询
     */
    NSString *sql_select = @"select * from book";
    FMResultSet *resultSet = [database executeQuery:sql_select];
    while (resultSet.next) {
        NSString *name = [resultSet stringForColumn:@"name"];
        NSLog(@"name == %@",name);
    }
}
@end