Ios 在Swift 3中将图像写入SQLite

那么直截了当地说问题。将图像写入数据库，然后读取它会产生两组不同的代码。据我所知，代码将图像转换为NSData，然后将其写入DB。然后它从数据库中读回它，然后将它转换回图片形式

下面是“选择”按钮的代码，它将NSData传递给全局变量，以便以后使用

@IBAction func btnCCTV1(_ sender: Any) {


    // Put Your Image URL
    let url:NSURL = NSURL(string : "http://cctv-sg.com/images/sr/01.jpg")!
    // It Will turn Into Data
    let imageData : NSData = NSData.init(contentsOf: url as URL)!
    // Data Will Encode into Base64
    let str64 = imageData.base64EncodedData(options: .lineLength64Characters)
    // Now Base64 will Decode Here
    let data: NSData = NSData(base64Encoded: str64 , options: .ignoreUnknownCharacters)!
    // turn  Decoded String into Data
    let dataImage = UIImage(data: data as Data)
    // pass the data image to image View.:)
    viewImage.image = dataImage

    print("====64====")
    print (str64)
    print(imageData)

    GlobalVar.data64 = imageData as NSData
    GlobalVar.imageByte=dataImage




}

然后我们就有了将数据保存到数据库的功能

@IBAction func btnSave(_ sender: Any) {

    let contactDB = FMDatabase(path: databasePath as String)



    print("==image====")
   // print(GlobalVar.imageByte)

    if (contactDB?.open())! {

        let insertSQL = "INSERT INTO CAMLOCATION (camname, latitude, longitude, description, photo) VALUES ('\(txtCamname.text!)', '\(txtLatitude.text!)', '\(txtLongitude.text!)', '\(txtDescription.text!)', '\(GlobalVar.data64)')"

        let result = contactDB?.executeUpdate(insertSQL,
                                              withArgumentsIn: nil)

        if !result! {
            lblResult.text = "Failed to add contact"
            print("Error: \(contactDB?.lastErrorMessage())")
        } else {
            lblResult.text = "Contact Added"
            txtCamname.text = ""
            txtLatitude.text = ""
            txtLongitude.text = ""
            txtDescription.text = ""
        }
    } else {
        print("Error: \(contactDB?.lastErrorMessage())")
    }

}

最后，使用find函数检索所述结果。它使用相机名称进行搜索

//====================================FIND BUTTON================================

@IBAction func btnFind(_ sender: Any) {

    let contactDB = FMDatabase(path: databasePath as String)



    print("========btnFind===========")

    if (contactDB?.open())! {
        let querySQL = "SELECT camname, latitude, longitude, description, photo FROM CAMLOCATION WHERE camname = '\(txtID.text!)'"

    //var blob: Data?
        print(querySQL)
        let results:FMResultSet? = contactDB?.executeQuery(querySQL,
                                                           withArgumentsIn: nil)

        //http://stackoverflow.com/questions/29067242/display-image-from-sqlite-blob-in-swift

        if results?.next() == true {
            txtCamname.text = results?.string(forColumn: "camname")
            txtLatitude.text = results?.string(forColumn: "latitude")
            txtLongitude.text = results?.string(forColumn: "longitude")
            txtDescription.text = results?.string(forColumn: "description")
            GlobalVar.data64 = results!.data(forColumn: "photo") as NSData

            print("$$$$$$$$$$$$$$$$$$$$$$$")

            print(GlobalVar.data64)

            // let correctPicture = results?.data(forColumn:"photo")

            //GlobalVar.imageByteGet = results?(forColumn:"photo")

            //blob = results?.data(forColumn: "photo")

            //  let ima = NSImage.init(data: blob!)

            // turn  Decoded String into Data

            let dataImage = UIImage(data: GlobalVar.data64 as Data)
            // pass the data image to image View.:)
            viewImage.image = dataImage

            //  print(imageByteGet)

            // viewImage.image = UIImage(data: imageByteGet!)

            //GlobalVar.display64 = results!.data(forColumn: "photo")
            lblResult.text = "Record Found"

        } else {

            lblResult.text = "Record not found"
            txtCamname.text = ""
            txtLatitude.text = ""
            txtLongitude.text = ""
            txtDescription.text = ""

        }
        contactDB?.close()
    } else {
        print("Error: \(contactDB?.lastErrorMessage())")
    }



    print("========Attempting decoding...===========")




    print("========Decoding....Done. Image should appear.===========")
}

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问题是，检索结果与我输入的结果不同。感谢您的帮助。谢谢。

如果您需要帮助，我建议您只需重新编写代码，将图像存储在磁盘上；对我来说，这是更好的解决办法。如果您这样做，您的DB可以存储到映像的路径

酷炫易学的lib帮助您实现轻松存储。一般算法为：

• 为所有图像选择唯一字段
• 使用SDWebImage的storeForKey将图像保存在磁盘上的某个位置
• 需要时使用imageForKey检索图像

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嗯，很有趣。我会考虑这个选择。