如何使用QLineEdit text从Postgresql提取数据到QtableWidgit

问题描述

我试图使用if语句向QTableWidget从Postgresql获取数据,但是当我应用变量并分配空值(无)时,表中没有任何显示。而且我不能在QlineEdit中使用where子句。是否有任何可能的方法可以重现此代码,使其正常工作?

def LoadData(self):
    name = self.Name_search.text()
    conn = psycopg2.connect(
            database = "postgres",user = "postgres",password = "**********",host = "localhost",port = "5432"
            ) 
    if name is None:
    with conn:
        cur = conn.cursor()
        rows = cur.execute("Select * from swimming_pool_users where name = '%s'",(name))
        data = cur.fetchall()
        for row in data:
            self.AddTable(row)
        cur.close()
        
def AddTable(self,columns):
    rowPosition = self.tableWidget2.rowCount()
    self.tableWidget2.insertRow(rowPosition)
    for i,column in enumerate(columns):
        self.tableWidget2.setItem(rowPosition,i,QtWidgets.QTableWidgetItem(str(column)))
def ClearTableData (self):
    while (self.tableWidget2.rowCount() > 0):
        self.tableWidget2.removeRow(0)

解决方法

我真的不明白您到底想要什么,但这是一个如何将数据从Postgresql数据库显示到QtableWidgit的示例

def exemple_Qtablewidgit(self):
        connection = psycopg2.connect(user="postgres",password="password",host="localhost",database="database")
        self.cur = connection.cursor()

        name = self.lineEdit.text()

        self.cur.execute(''' SELECT * FROM exemple WHERE name =%s''',(name,))
        data = self.cur.fetchall()

        if data :
            self.tableWidget.setRowCount(0)

            self.tableWidget.insertRow(0)
            for row,form in enumerate(data):
                for column,item in enumerate(form):
                    self.tableWidget.setItem(row,column,QTableWidgetItem(str(item)))
                    column += 1 

                row_position  = self.tableWidget.rowCount()
                self.tableWidget_3.insertRow(row_position)