首先我们要在.h中导入头文件
#import
#import "Model.h"
当然不要忘记导入sqlite的库
然后实现一些方法
{
//给数据库创建一个指针；
sqlite3 * sqliteDB;
NSString *newpath;
}
//单例
+(instancetype)shareData;
//初始化数据库
-(void)create;
//添加数据
-(void)insert:(Model *)mo;
//查询数据
-(NSMutableArray *)select;
////关闭数据库
//-(void)open;
//关闭数据库
-(void)close;
@end
其次实在.m中实现这些方法
static LoadData * ld = nil;
@implementation LoadData
//单例
+(instancetype)shareData{
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
ld = [[LoadData alloc]init];
});
return ld;
}
+(instancetype)allocWithZone:(struct _NSZone *)zone{
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
ld = [super allocWithZone:zone];
});
return ld;
}
-(id)copy{
return self;
}
-(id)mutableCopy{
return self;
}
//初始化数据库
-(void)create{
//创建沙盒路径
NSString * path = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)objectAtIndex:0];
//创建沙盒路径下的.db文件
newpath = [path stringByAppendingPathComponent:@"by.db"];
//打开数据库
sqlite3_open([newpath UTF8String], &sqliteDB);
//添加表格
[self inittable];
}
//创建表格
-(void)inittable{
//创建sql语句
const char * sql = "create table imgtable ( id integer primary key, image text)";
//创建预编译指针
sqlite3_stmt * stmt;
//把sql语句绑定到预编译指针中
sqlite3_prepare(sqliteDB, sql, -1, &stmt, nil);
//执行
sqlite3_step(stmt);
//释放预编译指针
sqlite3_finalize(stmt);
}
//添加数据
-(void)insert:(Model *)mo{
// const char * sqla = "insert into aiya values(null,?)";
//创建sql语句
const char * sql = "insert into imgtable values (null,?)";
sqlite3_stmt * stmt;
sqlite3_prepare(sqliteDB, sql, -1, &stmt, nil);
sqlite3_bind_text(stmt, 1, [mo.img UTF8String], -1, nil);
//绑定问号
// sqlite3_step(stmt);
if (sqlite3_step(stmt) == SQLITE_DONE) {
NSLog(@"成功");
}
sqlite3_finalize(stmt);
}
//查询数据
-(NSMutableArray *)select{
const char * sql = "select * from imgtable";
sqlite3_stmt * stmt;
sqlite3_prepare(sqliteDB, sql, -1, &stmt, nil);
NSMutableArray * arr = [[NSMutableArray alloc]init];
while (sqlite3_step(stmt) == SQLITE_ROW) {
Model * M = [[Model alloc]init];
M.img = [NSString stringWithUTF8String:(const char *)sqlite3_column_text(stmt, 1)];
NSData * data = [[NSData alloc]initWithBase64Encoding:M.img];
[arr addObject:data];
}
return arr;
}
//关闭数据库
-(void)close{
sqlite3_close(sqliteDB);
}
然后在viewcontroller中设置两个按钮并实现其方法
self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"name" style:UIBarButtonItemStyleDone target:self action:@selector(back)];;
-(void)back{
Model * m = [[Model alloc]init];
NSData * data = UIImageJPEGRepresentation(self.img.image, 0.5f);
m.img = [data base64Encoding];
[[LoadData shareData]insert:m];
MyViewController * my = [[MyViewController alloc]init];
[self.navigationController pushViewController:my animated:YES];
}