從數據庫中選擇一條記錄Flask/Sqlite

我在python/flask中使用了一個函數來刪除我的數據庫中的一些記錄。我唯一的問題是，我只能用一個id刪除記錄從1到9 如果我嘗試刪除一條記錄與高於9的ID我得到的錯誤：從數據庫中選擇一條記錄Flask/Sqlite

ProgrammingError: Incorrect number of bindings supplied. The current statement uses 1, and there are 2 supplied.

瓶代碼：

@app.route('/change-teacher', methods = ['GET', 'POST']) 
def changeTeacher(): 
    teacherId = request.form['id'] 
    teachers = selectFromDatabaseWithVar("SELECT * FROM leraren WHERE id = ?", teacherId) 
    teacherData = [dict(id = row[0], naam = row[1], voornaam = row[2], foto = row[3], email = row[4]) for row in teachers] 
    return render_template("leraarAanpassen.html", teacherData = teacherData) 

@app.route('/change-teacher/action', methods = ['GET', 'POST']) 
def changeTeacherAction(): 
    teacherData = (request.form['name'], request.form['firstName'], request.form['email'], request.form['id']) 
    insertAndUpdateDatabase("UPDATE leraren SET naam = ?, voornaam = ?, email = ? WHERE id = ?", teacherData) 
    return redirect(url_for("teachers")) 

@app.route('/delete-teacher', methods = ['GET', 'POST']) 
def deleteTeacher(): 
    teacherId = request.form['id'] 
    insertAndUpdateDatabase("DELETE FROM leraren WHERE id = ?", teacherId) 
    return redirect(url_for("teachers"))

模板：

{% include "dashboard.html" %} 
{% block content %} 

<table> 
<tr> 
    <th>ID</th> 
    <th>NAAM</th> 
    <th>VOORNAAM</th> 
    <th>FOTO</th> 
    <th>EMAIL</th> 
    <th>EDIT</th> 
    <th>DELETE</th> 
</tr> 

{% for leraar in leraren %} 
<tr> 
    <td>{{ leraar.id }}</td> 
    <td>{{ leraar.naam }}</td> 
    <td>{{ leraar.voornaam }}</td> 
    <td>{{ leraar.foto }}</td> 
    <td>{{ leraar.email }}</td> 
    <td> 
     <form method="POST" action="/change-teacher"> 
      <button type="submit" name="id" value="{{ leraar.id }}"> 
       <img src="{{ url_for('static', filename='img/settings.png') }}"> 
      </button> 
     </form> 
    </td> 
    <td> 
     <form method="POST" action="/delete-teacher"> 
      <button type="submit" name="id" value="{{ leraar.id }}"> 
       <img src="{{ url_for('static', filename='img/trash.png') }}"> 
      </button> 
     </form> 
    </td> 
</tr> 
{% endfor %} 
</table> 

<a href="/leraartoevoegen"><input type="button" name="addRecord" class="newRecord" value="Nieuwe record toevoegen"></a> 

{% endblock %}

我刪除功能：

def insertAndUpdateDatabase(query, data): 
    db = sqlite3.connect('schooldatabase.db') 
    cur = db.cursor() 
    cur.execute(query, data) 
    db.commit()

來源

2017-01-09 PeeJee

我認爲執行方法期待一個元組或字典。如果您更改到呼叫從

cur.execute(query, data)

在insertAndUpdateDatabase執行到

cur.execute(query, (data,))

您的代碼應工作。

來源

2017-01-09 20:26:30 anserk

爲了管理數據庫，我使用了瓶擴展名：flask_sqlalchemy，它使插入，修改和刪除數據庫中的記錄成爲非常重要的工作。例如：

給你一張表老師在一個模型模塊中定義一個名稱和年齡作爲列。要刪除記錄，你只需要做下一個：

to_delete = Teacher.query.filter_by(name="<the-one-you-want-delete>").first() 
db.session.delete(to_delete) 
db.session.commit()

而這將是所有的， db是SQLAlchemy的實例，你可以這樣創建：

from flask_sqlalchemy import SQLAlchemy 
db = SQLAlchemy(app)

更多細節我推薦Miguel Grinberg的書「Flask Web Development」

來源

2017-01-10 06:52:29 Lian

從數據庫中選擇一條記錄Flask/Sqlite

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