FMDB
来源：互联网 发布：淘宝促销广告语大全 编辑：程序博客网 时间：2024/05/29 15:22
//
// LKViewController.m
// 01-FMDB01-基本使用
//
// Created by apple on 14-7-25.
// Copyright (c) 2014年 Lenny. All rights reserved.
//
#import "ViewController.h"
#import "FMDB.h"
@interface ViewController ()
@property (nonatomic, strong) FMDatabase *db;
@end
@implementation ViewController
- (void)viewDidLoad
{
[super viewDidLoad];
// 1.获得数据库文件的路径
NSString *doc = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
NSString *filename = [doc stringByAppendingPathComponent:@"students.sqlite"];
// 2.得到数据库
FMDatabase *db = [FMDatabase databaseWithPath:filename];
// 3.打开数据库
if ([db open]) {
// 4.创表
BOOL result = [db executeUpdate:@"CREATE TABLE IF NOT EXISTS t_student (id integer PRIMARY KEY AUTOINCREMENT, name text NOT NULL, age integer NOT NULL);"];
if (result) {
NSLog(@"成功创表");
} else {
NSLog(@"创表失败");
}
}
self.db = db;
}
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
[self delete];
[self insert];
[self query];
}
- (void)insert
{
for (int i = 0; i<10; i++) {
NSString *name = [NSString stringWithFormat:@"jack-%d", arc4random_uniform(100)];
// executeUpdate : 不确定的参数用?来占位
[self.db executeUpdate:@"INSERT INTO t_student (name, age) VALUES (?, ?);", name, @(arc4random_uniform(40))];
// [self.db executeUpdate:@"INSERT INTO t_student (name, age) VALUES (?, ?);" withArgumentsInArray:@[name, @(arc4random_uniform(40))]];
// executeUpdateWithFormat : 不确定的参数用%@、%d等来占位
// [self.db executeUpdateWithFormat:@"INSERT INTO t_student (name, age) VALUES (%@, %d);", name, arc4random_uniform(40)];
}
}
- (void)delete
{
// [self.db executeUpdate:@"DELETE FROM t_student;"];
[self.db executeUpdate:@"DROP TABLE IF EXISTS t_student;"];
[self.db executeUpdate:@"CREATE TABLE IF NOT EXISTS t_student (id integer PRIMARY KEY AUTOINCREMENT, name text NOT NULL, age integer NOT NULL);"];
}
- (void)query
{
// 1.执行查询语句
FMResultSet *resultSet = [self.db executeQuery:@"SELECT * FROM t_student"];
// 2.遍历结果
while ([resultSet next]) {
int ID = [resultSet intForColumn:@"id"];
NSString *name = [resultSet stringForColumn:@"name"];
int age = [resultSet intForColumn:@"age"];
NSLog(@"%d %@ %d", ID, name, age);
}
}
@end
