Flask - Passing only selected fields

I have a flask webpage that asks for the user to select few fields and returns back output based on the fields selected.

The below code works just fine with 3 fields. If the user selects all the 3 fields there are no issues. However if any of the fields are not selected, it returns an error saying column "none" does not exist.

def template():

    form = TestForm()

    if form.validate_on_submit():

        student_id = form.student_id.data

        class_id = form.class_id.data

        roll_id = form.roll_id.data

        print(student_id)

        print(class_id)

        print(roll_id)

Could anyone assist on how I could modify this such that only fields selected are passed and the unselected fields are ignored. Thanks

Edit (HTML code):

<form action=""

          enctype="multipart/form-data"

          method="POST">

        {{form.hidden_tag()}}

        <table>



            <div class="checkbox">

            <label>

                <input type="checkbox" name="student_id" value="student_id"> student_id

            </label>

            </div>

            <div class="checkbox">

            <label>

                <input type="checkbox" name="class_id" value="class_id"> class_id

            </label>

            </div>

            <div class="checkbox">

            <label>

                <input type="checkbox" name="roll_id" value="roll_id"> roll_id

            </label>

            </div>

            <tr class="submit">

                <td></td>

                <td><button type="submit">Get the Report!</button>

                </td>

            </tr>

        </table>

    </form>

Query that runs after getting user input:

def function(*field_names):

    cursor = conn.cursor()

    cursor.execute('select {} from enrolments'.format(', '.join(str(field) for field in field_names)))

    print(field_names)

    output_file = dwh_cursor.fetchall()

edited Nov 21 '18 at 18:32

asked Nov 21 '18 at 18:28

scott martin

1288

Show your HTML and your validation code. It sounds like you have your select field value defaulting to "none". You probably want to default it to an empty string or change your validation

– Cfreak
Nov 21 '18 at 18:30

@Cfreak have included the HTML code in my initial post.

– scott martin
Nov 21 '18 at 18:32

1

Show us how you call function, also consider renaming it. Secondly, if field_names are coming directly from the value of your HTML, then this code is vulnerable to SQL Injection attacks. You want to specify the columns to select. Generally for checkboxes the value attribute should be a true or false value to decide if it's selected or not. The columns you select should be static and, you would use a WHERE statement in your SQL to control which rows you get back.

– Cfreak
Nov 21 '18 at 18:54

@Cfreak, this function hits a temp table that would have maximum of 10 records and this will only fetch 3 samples from that list. Sure would rename the function appropriately. However I am stuck on how to get past these non selected fields that return 'None'

– scott martin
Nov 21 '18 at 18:57

add a comment |

I have a flask webpage that asks for the user to select few fields and returns back output based on the fields selected.

def template():

    form = TestForm()

    if form.validate_on_submit():

        student_id = form.student_id.data

        class_id = form.class_id.data

        roll_id = form.roll_id.data

        print(student_id)

        print(class_id)

        print(roll_id)

Could anyone assist on how I could modify this such that only fields selected are passed and the unselected fields are ignored. Thanks

Edit (HTML code):

<form action=""

          enctype="multipart/form-data"

          method="POST">

        {{form.hidden_tag()}}

        <table>



            <div class="checkbox">

            <label>

                <input type="checkbox" name="student_id" value="student_id"> student_id

            </label>

            </div>

            <div class="checkbox">

            <label>

                <input type="checkbox" name="class_id" value="class_id"> class_id

            </label>

            </div>

            <div class="checkbox">

            <label>

                <input type="checkbox" name="roll_id" value="roll_id"> roll_id

            </label>

            </div>

            <tr class="submit">

                <td></td>

                <td><button type="submit">Get the Report!</button>

                </td>

            </tr>

        </table>

    </form>

Query that runs after getting user input:

def function(*field_names):

    cursor = conn.cursor()

    cursor.execute('select {} from enrolments'.format(', '.join(str(field) for field in field_names)))

    print(field_names)

    output_file = dwh_cursor.fetchall()

edited Nov 21 '18 at 18:32

asked Nov 21 '18 at 18:28

scott martin

1288

Show your HTML and your validation code. It sounds like you have your select field value defaulting to "none". You probably want to default it to an empty string or change your validation

– Cfreak
Nov 21 '18 at 18:30

@Cfreak have included the HTML code in my initial post.

– scott martin
Nov 21 '18 at 18:32

1

Show us how you call function, also consider renaming it. Secondly, if field_names are coming directly from the value of your HTML, then this code is vulnerable to SQL Injection attacks. You want to specify the columns to select. Generally for checkboxes the value attribute should be a true or false value to decide if it's selected or not. The columns you select should be static and, you would use a WHERE statement in your SQL to control which rows you get back.

– Cfreak
Nov 21 '18 at 18:54

@Cfreak, this function hits a temp table that would have maximum of 10 records and this will only fetch 3 samples from that list. Sure would rename the function appropriately. However I am stuck on how to get past these non selected fields that return 'None'

– scott martin
Nov 21 '18 at 18:57

add a comment |

I have a flask webpage that asks for the user to select few fields and returns back output based on the fields selected.

def template():

    form = TestForm()

    if form.validate_on_submit():

        student_id = form.student_id.data

        class_id = form.class_id.data

        roll_id = form.roll_id.data

        print(student_id)

        print(class_id)

        print(roll_id)

Could anyone assist on how I could modify this such that only fields selected are passed and the unselected fields are ignored. Thanks

Edit (HTML code):

<form action=""

          enctype="multipart/form-data"

          method="POST">

        {{form.hidden_tag()}}

        <table>



            <div class="checkbox">

            <label>

                <input type="checkbox" name="student_id" value="student_id"> student_id

            </label>

            </div>

            <div class="checkbox">

            <label>

                <input type="checkbox" name="class_id" value="class_id"> class_id

            </label>

            </div>

            <div class="checkbox">

            <label>

                <input type="checkbox" name="roll_id" value="roll_id"> roll_id

            </label>

            </div>

            <tr class="submit">

                <td></td>

                <td><button type="submit">Get the Report!</button>

                </td>

            </tr>

        </table>

    </form>

Query that runs after getting user input:

def function(*field_names):

    cursor = conn.cursor()

    cursor.execute('select {} from enrolments'.format(', '.join(str(field) for field in field_names)))

    print(field_names)

    output_file = dwh_cursor.fetchall()

edited Nov 21 '18 at 18:32

asked Nov 21 '18 at 18:28

scott martin

1288

I have a flask webpage that asks for the user to select few fields and returns back output based on the fields selected.

def template():

    form = TestForm()

    if form.validate_on_submit():

        student_id = form.student_id.data

        class_id = form.class_id.data

        roll_id = form.roll_id.data

        print(student_id)

        print(class_id)

        print(roll_id)

Could anyone assist on how I could modify this such that only fields selected are passed and the unselected fields are ignored. Thanks

Edit (HTML code):

<form action=""

          enctype="multipart/form-data"

          method="POST">

        {{form.hidden_tag()}}

        <table>



            <div class="checkbox">

            <label>

                <input type="checkbox" name="student_id" value="student_id"> student_id

            </label>

            </div>

            <div class="checkbox">

            <label>

                <input type="checkbox" name="class_id" value="class_id"> class_id

            </label>

            </div>

            <div class="checkbox">

            <label>

                <input type="checkbox" name="roll_id" value="roll_id"> roll_id

            </label>

            </div>

            <tr class="submit">

                <td></td>

                <td><button type="submit">Get the Report!</button>

                </td>

            </tr>

        </table>

    </form>

Query that runs after getting user input:

def function(*field_names):

    cursor = conn.cursor()

    cursor.execute('select {} from enrolments'.format(', '.join(str(field) for field in field_names)))

    print(field_names)

    output_file = dwh_cursor.fetchall()

python-3.x flask

edited Nov 21 '18 at 18:32

asked Nov 21 '18 at 18:28

scott martin

1288

edited Nov 21 '18 at 18:32

asked Nov 21 '18 at 18:28

scott martin

1288

edited Nov 21 '18 at 18:32

asked Nov 21 '18 at 18:28

scott martin

1288

asked Nov 21 '18 at 18:28

scott martin

1288

asked Nov 21 '18 at 18:28

scott martin

1288

Show your HTML and your validation code. It sounds like you have your select field value defaulting to "none". You probably want to default it to an empty string or change your validation

– Cfreak
Nov 21 '18 at 18:30

@Cfreak have included the HTML code in my initial post.

– scott martin
Nov 21 '18 at 18:32

1

Show us how you call function, also consider renaming it. Secondly, if field_names are coming directly from the value of your HTML, then this code is vulnerable to SQL Injection attacks. You want to specify the columns to select. Generally for checkboxes the value attribute should be a true or false value to decide if it's selected or not. The columns you select should be static and, you would use a WHERE statement in your SQL to control which rows you get back.

– Cfreak
Nov 21 '18 at 18:54

@Cfreak, this function hits a temp table that would have maximum of 10 records and this will only fetch 3 samples from that list. Sure would rename the function appropriately. However I am stuck on how to get past these non selected fields that return 'None'

– scott martin
Nov 21 '18 at 18:57

add a comment |

Show your HTML and your validation code. It sounds like you have your select field value defaulting to "none". You probably want to default it to an empty string or change your validation

– Cfreak
Nov 21 '18 at 18:30

@Cfreak have included the HTML code in my initial post.

– scott martin
Nov 21 '18 at 18:32

1

Show us how you call function, also consider renaming it. Secondly, if field_names are coming directly from the value of your HTML, then this code is vulnerable to SQL Injection attacks. You want to specify the columns to select. Generally for checkboxes the value attribute should be a true or false value to decide if it's selected or not. The columns you select should be static and, you would use a WHERE statement in your SQL to control which rows you get back.

– Cfreak
Nov 21 '18 at 18:54

@Cfreak, this function hits a temp table that would have maximum of 10 records and this will only fetch 3 samples from that list. Sure would rename the function appropriately. However I am stuck on how to get past these non selected fields that return 'None'

– scott martin
Nov 21 '18 at 18:57

Show your HTML and your validation code. It sounds like you have your select field value defaulting to "none". You probably want to default it to an empty string or change your validation

– Cfreak
Nov 21 '18 at 18:30

@Cfreak have included the HTML code in my initial post.

– scott martin
Nov 21 '18 at 18:32

Show us how you call function, also consider renaming it. Secondly, if field_names are coming directly from the value of your HTML, then this code is vulnerable to SQL Injection attacks. You want to specify the columns to select. Generally for checkboxes the value attribute should be a true or false value to decide if it's selected or not. The columns you select should be static and, you would use a WHERE statement in your SQL to control which rows you get back.

– Cfreak
Nov 21 '18 at 18:54

@Cfreak, this function hits a temp table that would have maximum of 10 records and this will only fetch 3 samples from that list. Sure would rename the function appropriately. However I am stuck on how to get past these non selected fields that return 'None'

– scott martin
Nov 21 '18 at 18:57

add a comment |

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