3

我已通过单击saveInfo按钮将图像和文本保存到sqlite3数据库中。 

- (IBAction)saveInfo:(id)sender {

    // Prepare the query string.
    NSString *query;

    if (self.recordIDToEdit == -1) {

        query = [NSString stringWithFormat:@"insert into empInfo values('%@', '%@','%@','%@','%@','%@' )", self.txtEmpCode.text, self.txtName.text, self.txtDesignation.text,self.txtDepartment.text,self.txtTagline.text,self.saveImage.image];
    }

    else{

        query = [NSString stringWithFormat:@"update empInfo set name='%@',empInfoCode='%@',designation='%@',department='%@',tagLine='%@',photo='%@' where empInfoCode=%d", self.txtEmpCode.text,self.txtName.text, self.txtDesignation.text,self.txtTagline.text,self.txtDepartment.text,self.saveImage.image, self.recordIDToEdit];

    }


    // Execute the query.--------------

        [self.dbManager executeQuery:query];

    //   If the query is sucessfull the show this in the dubugger.
    if (self.dbManager.affectedRows != 0) {

        NSLog(@"Query was executed successfully. Affected rows = %d", self.dbManager.affectedRows);

        // Here we inform the delegate that editing in app is finished.

        [self.delegate editingInfoWasFinished];

        // Pop the view controller.
        [self.navigationController popViewControllerAnimated:YES];
    }
    else{
        NSLog(@"%d",self.dbManager.affectedRows);
        NSLog(@"---Could not execute the query.----");
    }

}

然后我用这个方法加载数据，我可以访问文本数据但不能用这个方法加载图像。

-(void)loadInfoToEdit{

    // Create the query.

    NSString *query = [NSString stringWithFormat:@"select * from empInfo where empInfoCode=%d", self.recordIDToEdit];

    // Load the relevant data.

    NSArray *results = [[NSArray alloc] initWithArray:[self.dbManager loadDataFromDB:query]];

    // Setting the loaded data to the textfields and imageView.
.
    self.txtEmpCode.text = [[results objectAtIndex:0] objectAtIndex:[self.dbManager.arrColumnNames indexOfObject:@"empInfoCode"]];

    self.txtName.text = [[results objectAtIndex:0] objectAtIndex:[self.dbManager.arrColumnNames indexOfObject:@"name"]];

    self.txtDesignation.text = [[results objectAtIndex:0] objectAtIndex:[self.dbManager.arrColumnNames indexOfObject:@"designation"]];

     self.txtTagline.text = [[results objectAtIndex:0] objectAtIndex:[self.dbManager.arrColumnNames indexOfObject:@"tagLine"]];

    self.txtDepartment.text = [[results objectAtIndex:0] objectAtIndex:[self.dbManager.arrColumnNames indexOfObject:@"department"]];

self.saveImage.image = [[results objectAtIndex:0] objectAtIndex:[self.dbManager.arrColumnNames indexOfObject:@"photo"]];

  //  NSLog(@"This photo has:%@",[[results objectAtIndex:0]objectAtIndex:[self.dbManager.arrColumnNames indexOfObject:@"photo"]]);

  //  self.saveImage.image= [[results objectAtIndex:0]objectAtIndex:[self.dbManager.arrColumnNames indexOfObject:@"photo"]];

//    NSLog(@"This Nsdata object has %@",img);
//    self.saveImage.image = [UIImage imageWithData:img];

}

如何将图像加载到saveImage(UIImageView property) 中？

4

2 回答 2

3

您应该将图像保存在文档目录中。为此，您应该首先将图像转换为数据，然后将该数据保存（或写入）到documentdirectory. 并且您应该将图像名称保存到您的sqlite database

现在，当您从数据库中获取数据时，您将获得 imagename，imagename您可以从中获取保存的图像数据，document directory并将该数据转换为图像并可以根据需要使用。

例子 ：

保存图片，

   NSString *docsDir = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)objectAtIndex:0];

 NSString *profilePicturePath = [docsDir stringByAppendingPathComponent:@"profilePicture"];

 NSData *data = UIImageJPEGRepresentation(yourImage, 1.0);

 [data writeToFile:profilePicturePath atomically:NO];

您可以检索图像，例如，

 UIImage *img = [UIImage imageWithData:[NSData dataWithContentsOfFile:profilePicturePath]];
于 2016-07-20T13:16:49.297 回答
0

您不能像保存字符串数据一样保存图像。您必须将图像转换为 NSData，然后使用

sqlite3_bind_blob(statement, 2, [imgData bytes], [imgData length], SQLITE_TRANSIENT);

有关更多信息，请参阅此；

于 2016-07-20T13:00:41.253 回答