表 返回值为BOOL
BOOL flag = [self.database executeUpdate:@"create table if not exists t_testOfFMDB (id integer primary key autoincrement,name text)"];
if (flag) {
NSLog(@"成功建表");
}else{
NSLog(@"失败建表");
}
//关闭数据库
[self.database close];
}else{
NSLog(@"打开数据库失败");
}
}
- (IBAction)insert:(id)sender {
if ([self.database open]) {
for (NSInteger i = 0; i < 100; i ++) {
BOOL flag = [self.database executeUpdate:@"insert into t_testOfFMDB (name) values(?)",[NSString stringWithFormat:@"旭宝爱吃鱼--%zd",arc4random_uniform(99)]];
if (flag) {
NSLog(@"插入成功");
}else{
NSLog(@"插入失败");
}
}
}
[self.database close];
}
- (IBAction)update:(id)sender {
if ([self.database open]) {
for (NSInteger i = 0; i < 100; i ++) {
BOOL flag = [self.database executeUpdate:@"update t_testOfFMDB set name = 'hello world' where id > 50"];
if (flag) {
NSLog(@"修改成功");
}else{
NSLog(@"修改失败");
}
}
}
[self.database close];
}
- (IBAction)update:(id)sender {
if ([self.database open]) {
for (NSInteger i = 0; i < 100; i ++) {
BOOL flag = [self.database executeUpdate:@"update t_testOfFMDB set name = 'hello world' where id > 50"];
if (flag) {
NSLog(@"修改成功");
}else{
NSLog(@"修改失败");
}
}
}
[self.database close];
}
- (IBAction)select:(id)sender {
if ([self.database open]) {
//返回查询数据的结果集
FMResultSet * resultSet = [self.database executeQuery:@"select * from t_testOfFMDB"];
//查询表中的每一个记录
while ([resultSet next]) {
NSString * name = [resultSet stringForColumn:@"name"];
NSLog(@"%@",name);
}
}
[self.database close];
}
@end
sqlite存取图片
这里有几点注意:
- 图片无法直接存入数据库中需要把图片转换为二进制后存入数据库
- 二进制存储的格式为 blob
整体代码
//
// ViewController.m
// FMDB的使用
//
// Created by ma c on 16/5/10.
// Copyright © 2016年 xubaoaichiyu. All rights reserved.
//
#import "ViewController.h"
#import "FMDB.h"
@interface ViewController ()
@property (nonnull, strong) FMDatabase * database;
@property (weak, nonatomic) IBOutlet UIImageView *imageView;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
//数据库在沙盒中的路径
NSString * fileName = [[NSSearchPathForDirectoriesInDomains(13, 1, 1)lastObject]stringByAppendingPathComponent:@"testOfFMDB.sqlite"];
NSLog(@"%@",fileName);
//创建数据库
self.database = [[FMDatabase alloc]initWithPath:fileName];
//打开数据库
if ([self.database open]) {
NSLog(@"打开数据库成功");
//创建表 返回值为BOOL
BOOL flag = [self.database executeUpdate:@"create table if not exists t_testOfFMDB (id integer primary key autoincrement,image blob)"];
if (flag) {
NSLog(@"成功建表");
}else{
NSLog(@"失败建表");
}
//关闭数据库
[self.database close];
}else{
NSLog(@"打开数据库失败");
}
}
- (IBAction)insert:(id)sender {
if ([self.database open]) {
NSData * data = UIImageJPEGRepresentation([UIImage imageNamed:@"BG.jpg"], 1);
BOOL flag = [self.database executeUpdate:@"insert into t_testOfFMDB (image) values(?)",data];
if (flag) {
NSLog(@"插入成功");
}else{
NSLog(@"插入失败");
}
}
[self.database close];
}
- (IBAction)delete:(id)sender {
if ([self.database op