【发布时间】：2013-03-07 05:06:20
【问题描述】：
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *path = [documentsDirectory stringByAppendingPathComponent:@"image.sqlite"];
if (sqlite3_open_v2([path UTF8String], &database, SQLITE_OPEN_READWRITE, NULL) == SQLITE_OK)
{
if(selectStmt == nil)
{
const char *sql = "insert into imagetb(imagename,image) Values(?,?)";
if(sqlite3_prepare_v2(database, sql, -1, &selectStmt, NULL) != SQLITE_OK)
// NSAssert1(0, @"Error while creating add statement. '%s'", sqlite3_errmsg(database));
NSLog(@"%s",sqlite3_errmsg(database));
}
sqlite3_bind_text(selectStmt, 1, [@"test.png" UTF8String], -1, SQLITE_TRANSIENT);
sqlite3_bind_blob(selectStmt, 2, [data1 bytes], [data1 length], SQLITE_TRANSIENT);
if(SQLITE_DONE != sqlite3_step(selectStmt))
NSLog(@"get: %s",sqlite3_errmsg(database));
else
NSLog(@"scan data added");
}
//showimage
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
if (sqlite3_open([path UTF8String], &database) == SQLITE_OK)
{
const char *sql = "select * from imagetb";// LIMIT 0,100 ";// where status = 1 ";
sqlite3_stmt *selectstatment;
if (sqlite3_prepare_v2(database, sql, -1, &selectstatment, NULL) == SQLITE_OK)
{
while (sqlite3_step(selectstatment) == SQLITE_ROW)
{
NSString *getorgstrid = [NSString stringWithUTF8String:(char *)sqlite3_column_text(selectstatment, 0)];
NSLog(@"id->%@",getorgstrid);
[getid addObject:getorgstrid];
NSString *getorgstrname = [NSString stringWithUTF8String:(char *)sqlite3_column_text(selectstatment, 1)];
NSLog(@"name->%@",getorgstrname);
[getname addObject:getorgstrname];
NSData *getorgstrimage = [[NSData alloc] initWithBytes:sqlite3_column_blob(selectstatment,2)length:sqlite3_column_bytes(selectstatment, 2)];
[getimage addObject:getorgstrimage];
}
}
sqlite3_finalize(selectstatment);
}
//[tblorgland reloadData];
UIImage *image1 = [UIImage imageWithData:[getimage lastObject]];
NSLog(@"image%@",image1);
[getImageview setImage:image1];
[pool release];
==============================================================================
- (NSString *) getDBPath
{
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory , NSUserDomainMask, YES);
NSString *documentsDir = [paths objectAtIndex:0];
return [documentsDir stringByAppendingPathComponent:@"image.sqlite"];
}
- (void)viewDidLoad
{
[super viewDidLoad];
getid=[[NSMutableArray alloc]init];
getname=[[NSMutableArray alloc]init];
getimage=[[NSMutableArray alloc]init];
[self downloadimage];
[self makeDBCopyAsNeeded];
}
-(void)downloadimage
{
NSLog(@"Downloading...");
UIImage *image = [[UIImage alloc] initWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:@"http://0.tqn.com/d/graphicssoft/1/7/g/A/5/psptubezdotcom_003.png"]]];
NSLog(@"%f,%f",image.size.width,image.size.height);
NSString *docDir = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
NSLog(@"%@",docDir);
NSLog(@"saving png");
pngFilePath = [NSString stringWithFormat:@"%@/test.png",docDir];
data1 = [NSData dataWithData:UIImagePNGRepresentation(image)];
img=[[UIImage alloc]initWithData:data1];
[data1 writeToFile:pngFilePath atomically:YES];
NSLog(@"saving jpeg");
NSString *jpegFilePath = [NSString stringWithFormat:@"%@/test.jpeg",docDir];
NSLog(@"jpegFilePath:%@",jpegFilePath);
data2 = [NSData dataWithData:UIImageJPEGRepresentation(image, 1.0f)];
[data2 writeToFile:jpegFilePath atomically:YES];
NSLog(@"saving image done");
[image release];
}
- (void) makeDBCopyAsNeeded
{
BOOL success;
NSFileManager *fileManager = [NSFileManager defaultManager];
NSError *error;
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *writableDBPath = [documentsDirectory stringByAppendingPathComponent:@"image.sqlite"];
success = [fileManager fileExistsAtPath:writableDBPath];
NSString *dbPath = [self getDBPath];
NSLog(@"%@",dbPath);
if (success)
{
NSLog(@"Database Success Created");
return;
}
NSString *defaultDBPath = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"image.sqlite"];
success = [fileManager copyItemAtPath:defaultDBPath toPath:writableDBPath error:&error];
if (!success)
{
NSLog(@"Database:->%s",sqlite3_errmsg(database));
}
}
【问题讨论】：
-
您可以将图像的路径存储到数据库中，而不是存储整个图像
-
看看 SO 问题 :stackoverflow.com/questions/5039343/… 。希望这会对你有所帮助。
-
将图像写入文件系统要好得多。您可以引用数据库中的文件名。
-
S 最好将图像存储在 Document 目录中，并使用一些唯一的 id 作为图像名称，以便更好地使用..
-
我会存储图片的地址。当需要将图片加载到 UIImageView 时，使用 imageWithContentsOfFile 将图片加载到 UIImageView
标签： iphone ios objective-c sqlite