iOS FMDB的使用(增,删,改,查,sqlite存取图片)

在上一篇博客我对sqlite的基本使用进行了详细介绍...

但是在实际开发中原生使用的频率是很少的...

这篇博客我将会较全面的介绍FMDB的使用...

例: 增,删,改,查,sqlite存取图片

有关框架的导入我在上一篇博客进行了详细介绍这里就不在介绍,没有看到上一篇博客的可以点击下面的连接.

iOS sqlite3 的基本使用(增 删 改 查)

接下来我会按照上篇博客的顺序,模式进行介绍.

(增删改查与sqlite存取图片我会通过两个工程介绍)

创建数据库与表

代码:

@interface ViewController ()

@property (nonnull, strong) FMDatabase * database;

@end

- (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,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");
}

}

图片(创建数据库与表)



增

代码:

- (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];
}

图片(增)



删

代码:

- (IBAction)delete:(id)sender {

if ([self.database open]) {
for (NSInteger i = 0; i < 100; i ++) {

BOOL flag = [self.database executeUpdate:@"delete from t_testOfFMDB where id < 50"];

if (flag) {
NSLog(@"删除成功");
}else{
NSLog(@"删除失败");
}

}
}
[self.database close];

}

图片(删)



改

代码:

- (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];
}

图片(改)



查

代码:

- (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];
}

图片(查)



整体代码

//
//  ViewController.m
//  FMDB的使用
//
//  Created by ma c on 16/5/10.
//  Copyright © 2016年 xubaoaichiyu. All
1406c
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,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 open]) {

BOOL flag = [self.database executeUpdate:@"delete from t_testOfFMDB"];

if (flag) {
NSLog(@"删除成功");
}else{
NSLog(@"删除失败");
}

}
[self.database close];

}
- (IBAction)update:(id)sender {

if ([self.database open]) {

NSData * data = UIImageJPEGRepresentation([UIImage imageNamed:@"CX.jpg"], 1);

BOOL flag = [self.database executeUpdate:@"update t_testOfFMDB set image = ?",data];

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]) {

NSData * data = [resultSet dataForColumn:@"image"];

UIImage * image = [UIImage imageWithData:data];

self.imageView.image = image;

}

}
[self.database close];
}

@end