在 MySQL 数据库中存储复选框值的最佳方法是什么？

Question

First, take a look at this page as an example: Click here

If you view the 'Amenities' section, there are 3 sets of checkboxes (Unit Features, Community Features and Utilities Included in Rent).

My Question Is: How can I use PHP to make 3 array variables (eg $unit_features, $community_features and $utilities_included) to store which boxes are/are not checked into 3 respective fields in a table?

More importantly: How do I pull the data out of the table in the same array format so that specifics can be viewed/edited/deleted?

• Note, I've tried countless times to do this by having separate fields in the table (as tinyints) - but it gets bulky and isn't elegant at all...I even thought of making an object class but failed yet again..

Answer 1

You have a many-to-many relationship between properties and amenities. To model this, you need a separate table, not a variable number of columns.

There is one table which stores your properties.

INSERT INTO property (id, address, square_footage...) VALUES (111, '123 Main St', 1234...)

There is one table which stores all possible amenities.

INSERT INTO amenities (id, type, description) VALUES (222, 'Unit Features', 'Air Conditioning');

For each amenity a property has, insert one row into the table relating these two:

INSERT INTO property_amenitities (property_id, amenity_id) VALUES (111, 222);

When you want to know what amenities a specific property has, just SELECT all rows from this table for that property's key. When you want to print out checkboxes for all amenities, SELECT from the amenities table and do a LEFT OUTER JOIN to the property_amenities table. Those rows with null values from the property_amenities table are the boxes which are unchecked.

Related reading . You should pick up a book on relational databases from your local BORDERS before they go out of business:)

Answer 2

If they are not mutually exclusive; you can use bitwise operators to store them.

field = 0;
if($unity_features_selected == true) {
  field |= (1<<0);
}
if($community_features_selected == true) {
  field |= (1<<1);
}
if($utilties_included_selected == true) {
  field |= (1<<2);
}

then store field as an unsigned int. This lets you query for (ex. unity_features) such as

select * from <table> where field&(1<<0);

Or community features:

select * from <table> where field&(1<<1);

Answer 3

1) php serialize and unserialize ( http://php.net/manual/en/function.serialize.php ) will help you keep arrays or objects or any other structural data in db.

2)use array format for input's names like described here: Submitting a multidimensional array via POST with php

3)remember that checkboxes unchecked won't be send at all, so always make one hidden input field for every checkbox field. That will ensure, that unchecked checbox will be sent as false. Here is an example: Post the checkboxes that are unchecked

So reasuming - you could sent that way thre arrays, with falues for all checkboxes (1 or 0), and store them in three fields as serialized objects.