//业务处理层.h文件
//首先导入数据库头文件 类头文件
#import <sqlite3.h>
#import “Model.h”
@interface LoadData : NSObject
//全局变量
{
sqlite3 *ss;
}
//单例类
+(instancetype)initShaertData;
//打开数据库
-(void)initOpenData;
//添加
-(void)addData:(Model *)mm;
//查询
-(NSMutableArray *)getAllData;
//关闭
-(void)close;
@end
//业务处理层.m文件 也是sqlite数据方法实现的界面
#import “LoadData.h”
////静态指针
static LoadData *ld = nil;
@implementation LoadData
//单例类
+(instancetype)initShaertData{
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
ld = [[LoadData alloc]init];
});
return ld;
}
+(instancetype)allocWithZone:(struct _NSZone *)zone{
if (!ld) {
ld = [super allocWithZone:zone];
}
return ld;
}
-(id)copy{
return self;
}
-(id)mutableCopy{
return self;
}
//打开数据库
-(void)initOpenData{
NSString *path = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)objectAtIndex:0];
NSString *newpath = [path stringByAppendingPathComponent:@”sy.db”];
NSLog(@”new == %@”,newpath);
if (sqlite3_open([newpath UTF8String],&(ss)) == SQLITE_OK) {
NSLog(@”打开了”);
[self initTable];
}
}
//初始化数据库
-(void)initTable{
const char *sql = “create table if not exists zoo(id intager primary key, imgName text,img BLOB)”;
sqlite3_stmt *stmt;
sqlite3_prepare(ss, sql, -1, &stmt, nil);
sqlite3_step(stmt);
sqlite3_finalize(stmt);
}
//添加数据库
-(void)addData:(Model *)mm{
const char *sql = “insert into zoo values(null,?,?)”;
sqlite3_stmt *stmt;
sqlite3_prepare(ss, sql, -1, &stmt, nil);
sqlite3_bind_text(stmt, 1, [mm.imgName UTF8String], -1, SQLITE_TRANSIENT);
sqlite3_bind_text(stmt, 2, [mm.img bytes], (int)[mm.img length], SQLITE_TRANSIENT);
if (sqlite3_step(stmt) == SQLITE_DONE) {
NSLog(@”添加成功”);
}
sqlite3_finalize(stmt);
}
//查询数据库
-(NSMutableArray *)getAllData{
const char *sql = “select *from zoo”;
sqlite3_stmt *stmt;
sqlite3_prepare(ss, sql, -1, &stmt, nil);
NSMutableArray *arr = [[NSMutableArray alloc]init];
while (sqlite3_step(stmt) == SQLITE_ROW) {
Model *mm = [[Model alloc]init];
mm.imgName = [NSString stringWithUTF8String:(const char *) sqlite3_column_text(stmt, 1)];
mm.img = [NSData dataWithBytes:sqlite3_column_blob(stmt, 2) length:sqlite3_column_bytes(stmt, 2)];
[arr addObject:mm];
}
sqlite3_finalize(stmt);
return arr;
}
//关闭数据库
-(void)close{
sqlite3_close(ss);
}
@end
Model.h层文件定义属性
@property(nonatomic,strong)NSString *imgName;
@property(nonatomic,strong)NSData *img;
