在MySQL数据库表列中使用PyQt5插入图像文件

问题描述

我一直很难在MysqL表中插入图像。我已经使用QFileDialog来浏览和显示图像。但是，保存后，每当我单击以检查表列中的BLOB时，都不会保存任何内容。我尝试进行一些研究，但我意识到将图像作为文本文件插入sql命令中是错误的。老师，请问，重组我以下代码并实现插入图像的最佳方法是什么？

class TestReg(QWidget):

    def __init__(self):
        super().__init__()
        self.ui = Ui_TestRegForm()
        self.ui.setupUi(self)

        #Calling browseImage
        self.ui.browse_btn.clicked.connect(self.browseImage)

        #Calling insertPers
        self.ui.save_btn.clicked.connect(self.insertPers)

    #browses person's picture and displays using label called image_label
    def browseImage(self):
        file_name = QFileDialog.getopenFileName(self,'Open File','c:\\','Image Files (*.png *.jpg *gif)')
        image_path = file_name[0]
        pixmap = Qpixmap(image_path)
        self.ui.image_label.setpixmap(Qpixmap(pixmap))

    #Inserts person into database
    def insertPers(self):
        try:
            con = MysqLdb.connect(host="localhost",user="root",password="",database="somedb")
            with con:
                cur = con.cursor()
                cur.execute("INSERT INTO persons(name,photo)" "VALUES('%s','%s')" % (''.join(self.ui.name_edit.text()),''.join(self.ui.image_label.text()))
                con.commit()
                self.displayDialog(QMessageBox.information,"Registration","Person has been added successfully")
        except MysqLdb.Error as e:
            self.displayDialog(QMessageBox.Warning,str(e))
        except TypeError as e:
            self.displayDialog(QMessageBox.Warning,str(e))
        except ValueError as e:
            self.displayDialog(QMessageBox.Warning,str(e))

解决方法

您不应连接变量以构建查询，而应使用占位符，否则您的代码将容易受到SQL Injection攻击的影响。另一方面，您必须使用QBuffer作为中介将QPixmap（而不是文本）转换为字节：

con = MySQLdb.connect(host="localhost",user="root",password="",database="somedb")
with con:
    cur = con.cursor()
    name = self.ui.name_edit.text()
    buff = QBuffer()
    buff.open(QIODevice.WriteOnly)
    pixmap = QPixmap(self.ui.image_label.pixmap())
    pixmap.save(buff,"PNG")
    binary_img = buff.data().toBase64().data()
    cur.execute("INSERT INTO persons(name,photo) VALUES (%s,%s)",(name,binary_img))
    con.commit()

mysql pyqt5 python qpixmap