sqlite之增删改查--简单的实现iOS收藏夹功能

使用sqlite可以实现简单的收藏夹功能，不多说直接上代码。

1.首先导入libsqlite3.0.dylib，libz.dylib两个类库

2.封装一个NSObject类型的类去管理 （即写sql语句）

在这个类里首先导入一个头文件和你建好的model类 （实现收藏本质是存model类）

model类只是建立需要的字符串(我只写了.h .m里什么都没写)

#import <Foundation/Foundation.h>

@interface TopicDB :
NSObject

@property(nonatomic,
retain)NSString *topic_id;

@property(nonatomic,
retain)NSString *topic_title;

@property(nonatomic,
retain)NSString *topic_name;

@property(nonatomic,
retain)NSString *topic_image;

@end

真正的部分是封装的这个管理类：

.h里声明相应方法，导入相应头文件

#import
<sqlite3.h>

#import "TopicDB.h"//我的那个model类
//创建、关闭数据库以及增删改查

+(void)open;

+ (void)close;

+(void)create;

+ (void)insert:(TopicDB *)mymodel;

+ (void)remove:(TopicDB *)mymodel;

+ (void)update;

+ (NSArray *)select;

.m里把这几个方法实现（直接上代码）

#import "DataBaseManager.h"
static
sqlite3 *dbPoint =
nil;

@implementation DataBaseManager
+ (void)open
{

if (dbPoint) {

return;
}

NSString *path = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,
NSUserDomainMask, YES)
firstObject];

path = [path
stringByAppendingPathComponent:@"travel_Topic.rdb"];

NSLog(@"%@", path);

int result = sqlite3_open(path.UTF8String, &dbPoint);

if (result == SQLITE_OK) {

NSLog(@"数据库打开成功");
}
}
+ (void)close
{

sqlite3_close(dbPoint);
}
+ (void)create
{
[self
open];

NSString *sql =
@"create table travel_Topic (title text, name text, image text, id text)";

sqlite3_exec(dbPoint, sql.UTF8String,
NULL, NULL,
NULL);
}
+ (void)insert:(TopicDB *)mymodel
{
[self
open];

NSString *sql = [NSString
stringWithFormat:@"insert into travel_Topic values ('%@','%@','%@','%@')", mymodel.topic_title ,mymodel.topic_name, mymodel.topic_image,
mymodel.topic_id];

sqlite3_exec(dbPoint, sql.UTF8String,
NULL, NULL,
NULL);
}
+ (void)remove:(TopicDB *)mymodel
{
[self
open];

NSString *sql = [NSString
stringWithFormat:@"delete from travel_Topic where title = '%@'",mymodel.topic_title];

sqlite3_exec(dbPoint, sql.UTF8String,
NULL, NULL,
NULL);
}
+ (void)update
{
[self
create];

NSString *sql =
@"update travel_Topic set name = '汲国兴250' where number = '250'";

sqlite3_exec(dbPoint, sql.UTF8String,
NULL, NULL,
NULL);


}
+ (NSArray *)select
{
[self
open];


//创建数据库替身

sqlite3_stmt *stmt =
nil;

NSString *sql =
@"select * from travel_Topic";

//执行语句

int result = sqlite3_prepare_v2(dbPoint, sql.UTF8String, -1, &stmt,
NULL);

//判断是否成功

if (result == SQLITE_OK) {


//创建数组用来保存查询的数据

NSMutableArray *arr = [NSMutableArray
array];

//如果还有下一行

while (sqlite3_step(stmt) ==
SQLITE_ROW) {

//获取数据

const unsigned
char * topic_title =
sqlite3_column_text(stmt, 0);

const unsigned
char * topic_name =
sqlite3_column_text(stmt, 1);

const unsigned
char * topic_image =
sqlite3_column_text(stmt, 2);

const unsigned
char * topic_id =
sqlite3_column_text(stmt, 3);

//封装成model

TopicDB *mymodel = [[TopicDB
alloc] init];
mymodel.topic_title = [NSString
stringWithUTF8String:(const
char *) topic_title];
mymodel.topic_name = [NSString
stringWithUTF8String:(const
char *) topic_name];
mymodel.topic_image = [NSString
stringWithUTF8String:(const
char *) topic_image];
mymodel.topic_id = [NSString
stringWithUTF8String:(const
char *) topic_id];
[arr
addObject:mymodel];
}

sqlite3_finalize(stmt);
//释放数据库替身

return arr;
}

sqlite3_finalize(stmt);

return [NSMutableArray
array];
}
3.在所需的页面（标签4中的详情页）创建一个收藏按钮，编写一个点击事件的方法（将相应的信息存到model类里）
如下：

-(void)collectionButton
{


//创建数据库
数据库内同一个表不会叠加 所以放心建。

[DataBaseManager
create];

//初始化model类存所需数据

TopicDB *model = [[TopicDB
alloc]init];

model.topic_title =
_str2;

model.topic_name =
_str1;

model.topic_image =
_str;

model.topic_id = [NSString
stringWithFormat:@"%lu",
_Travel_Topic_Sub_Id];

//alert提示框

_alertView = [[UIAlertView
alloc]initWithTitle:@"提示"
message:@"已收藏