Question

我正在尝试使用QLineEdit小部件从用户检索某些值。当QPushButton引发单击事件时，我希望从所有QLineEdit小部件中检索文本并将其存储在本地MySQL数据库中。但是，当我尝试在insert语句中使用字符串替换时，值不会被替换。这是我的sql语句：

sql = 'INSERT INTO jobs (incident_id, organization, organization_poc, media_type) VALUES ("%s", "%s", "%s", "%s")' % (self.edi_IncidentID.text(), self.edi_OrganizationAffected.text(), self.edi_OrganizationContact.text(), self.edi_MediaType.text())

所有self.edi_xxx变量都只是QLineEdit小部件。按下按钮时，会触发以下内容：

self.connect(btn_Submit, QtCore.SIGNAL('clicked()'), self.submitForm)

所有提交都是创建数据库对象并将值写入数据库。但是，为了调试我打印出构造的SQL语句，这就出现了： INSERT INTO作业（incident_id，organization，organization_poc，media_type）VALUES（“”，“”，“”，“”）。

我也尝试使用str（）函数将QString转换为字符串，但同样的事情发生了。

非常感谢任何帮助：）？

→

编辑：这是完整的代码减去导入：

class Database():
def __init__(self):
   self.db_host = "localhost"
   self.db_user = "***********"
   self.db_pass = "***********"
   self.db_name = "incidents"

def openConn(self):
   self.db = MySQLdb.connect(self.db_host, self.db_user, self.db_pass, self.db_name)

def closeConn(self):
   self.db.close()

def writeValues(self, sql):
   self.openConn()
   self.cursor = self.db.cursor()
   self.cursor.execute(sql)
   self.cursor.fetchone()
   self.closeConn()

class NewIncidentForm(QtGui.QWidget):
def __init__(self, parent=None):
    QtGui.QWidget.__init__(self, parent)

    self.setWindowTitle('New Incident')

    lbl_IncidentID = QtGui.QLabel('Incident ID:')
    lbl_MediaType = QtGui.QLabel('Media Type:')
    lbl_OrganizationAffected = QtGui.QLabel('Organization Affected:')
    lbl_OrganizationContact = QtGui.QLabel('Organization Point of Contact: ')

    self.edi_IncidentID = QtGui.QLineEdit()
    self.edi_MediaType = QtGui.QLineEdit()
    self.edi_OrganizationAffected = QtGui.QLineEdit()
    self.edi_OrganizationContact = QtGui.QLineEdit()


    btn_Submit = QtGui.QPushButton('Submit')

    grid = QtGui.QGridLayout()
    grid.setSpacing(10)

    grid.addWidget(lbl_IncidentID, 1, 0)
    grid.addWidget(self.edi_IncidentID, 1, 1)

    grid.addWidget(lbl_MediaType, 3, 0)
    grid.addWidget(self.edi_MediaType, 3, 1)

    grid.addWidget(lbl_OrganizationAffected, 4, 0)
    grid.addWidget(self.edi_OrganizationAffected, 4, 1)

    grid.addWidget(lbl_OrganizationContact, 5, 0)
    grid.addWidget(self.edi_OrganizationContact, 5, 1)

    grid.addWidget(btn_Submit, 15, 0)

    self.sql = 'INSERT INTO jobs (incident_id, organization, organization_poc, media_type) VALUES ("%s", "%s", "%s", "%s")' % (self.edi_IncidentID.text(), self.edi_OrganizationAffected.text(), self.edi_OrganizationContact.text(), self.edi_MediaType.text())
    self.connect(btn_Submit, QtCore.SIGNAL('clicked()'), self.submitForm)        

    self.setLayout(grid)
    self.resize(350, 300)

def submitForm(self):
    db = Database()
    db.writeValues(self.sql)

app = QtGui.QApplication(sys.argv)
qb = NewIncidentForm()
qb.show()
sys.exit(app.exec_())

Answer 1

：d QString有__str__个函数，所以试试这个：

self.sql = 'INSERT INTO jobs (incident_id, organization, organization_poc, media_type) VALUES ("%s", "%s", "%s", "%s")' % (''.join(self.edi_IncidentID.text()), ''.join(self.edi_OrganizationAffected.text()), ''.join(self.edi_OrganizationContact.text()), ''.join(self.edi_MediaType.text()))

添加''.join()

或者QString必须是Utf8（）

将self.edi_IncidentIS.text()更改为：

self.edi_IncidentIS.text().toUtf8()

整个指示：

self.sql = 'INSERT INTO jobs (incident_id, organization, organization_poc, media_type) VALUES ("%s", "%s", "%s", "%s")' % (self.edi_IncidentID.text().toUtf8(), self.edi_OrganizationAffected.text().toUtf8(), self.edi_OrganizationContact.text().toUtf8(), self.edi_MediaType.text().toUtf8())

Answer 2

原因很简单：

self.sql应该在 def submitForm（self）：

不在 def init （self，parent = None）：

因为其他人认为它是无效的！

Answer 3

程序缺少的另一部分是commit（）函数，用于在脚本的乞讨时存储数据或自动提交（true）

def closeConn(self):
self.db.close()
self.db.commit()

def submitForm(self):
db = Database()
self.sql = 'INSERT INTO jobs (incident_id, organization, organization_poc, media_type) VALUES ("%s", "%s", "%s", "%s")' % (self.edi_IncidentID.text(), self.edi_OrganizationAffected.text(), self.edi_OrganizationContact.text(), self.edi_MediaType.text())      
db.writeValues(self.sql)

Python / PyQT QString不会插入MySQL数据库

3 个答案: