multiple-records | 易学教程

How to delete multiple rows with 2 columns as composite primary key in MySQL?

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问题 My innodb table has the following structure: 4 columns (CountryID, Year, %Change, Source) , with the 2 columns (CountryID, Year) as the primary key. How do I delete multiple rows other than using a for-loop to delete each row? I'm looking for something similar to DELETE FROM CPI WHERE CountryID AND Year IN (('AD', 2010), ('AF', 2009), ('AG', 1992)) 回答1: The answer in Oracle is: delete from cpi where (countryid, year) in (('AD', 2010), ('AF', 2009), ('AG', 1992)) It's fairly standard SQL

How to delete multiple rows with 2 columns as composite primary key in MySQL?

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How to Create a new blank Record without it showing the previous data from the previous record?

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问题 I keep trying to create a new record expecting a new blank form to show up but all of the info from the previous form shows up. I need a blank form to enter data but i also need to save all of my previous forms. Overall, I want to keep adding onto my records. But somehow it won't let me. 回答1: If I'm understanding correctly you open a form but it is showing the data you previously entered? if it is that you want avoid seeing the previous data and just have a blank for for entry that you should

How do I set a unique ID for checkboxes in a multi-record Rails form?

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问题 I've set up a Rails form roughly following the instructions in this Railscast. Here's the code for the form: <% form_tag complete_todos_path, :method => :put do %> <ul> <div id="incomplete_todos"> <% @incomplete_todos.each do |todo| %> <%= render :partial => todo %> <% end %> </div> </ul> <%= submit_tag "Mark as completed" %> <% end %> And here's the code for the todo partial: <div class="todo"> <li> <%= check_box_tag "todo_ids[]", todo.id %> <%=h todo.name %> <%= link_to 'edit', edit_todo

inserting multiple rows in database on codeigniter [duplicate]

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问题 This question already has answers here : Closed 6 years ago . Possible Duplicate: insert multiple rows via a php array into mysql i am trying to insert only filled data in to the database. my controller $code=$_POST['code']; $rate=$_POST['rate']; $quantity=$_POST['quantity']; //$total=$_POST['rate']*$_POST['quantity']; $count = count($_POST['code']); for($i=0; $i<$count; $i++) { $data = array( 'shop'=>$shop->$this->input->post('shop'), 'code' => $code[$i], 'rate' => $rate[$i], 'quantity' =>

How to identify duplicate items gathered from multiple feeds and link to them in a Database

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问题 I have a Database storing details of products which are taken from many sites, and gathered through the individual sites API's. When I call the feed, the details are stored in a database table. The problem I'm having is that because the exact same product is listed on many sites by the seller I end up having duplicate items in my database, and then when I display them on a web page there are many duplicates. The problem is that the item doesn't have any obvious unique identifier, it has

Insert multiple records with a date range in MS Access

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问题 hoping someone can help? I'm fairly new to Access 2016 and have been tasked with building a very simple booking system for our school's breakfast and after school clubs. I have a table with a list of Children (primary key is ChildID), another table (CLUBS) lists the 5 clubs available, and a third table (BOOKINGS) connects the children to the clubs (ChildID, ClubID, DateRequested) I have a simple form that enables me to select a child's name from a drop down box, then from a list choose a club

Handling multiple records and models trought ajax in a form using Yii

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问题 This must be a common scenario somehow: On a form called Subscription we have, among other subscription related fields, this: Select How many foo you need: Select box with 5 options from [1] to [5 ] If the user selects 2 then, via Ajax the following should appear:  <input type="text" id="name1">Name of thing</input> <input type="text" id="age1">Age of thing</input>  <input type="text" id="name2">Name of thing</input> <input type="text" id="age2">Age of thing</input

Codeigniter update mysql table data from form with checkbox

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问题 New to codeigniter and trying to get my head around updating checked rows from a user form. My view generates a form with MySQL data as below: <?php echo form_open('masterdata/update_customers'); ?> <table> <tr> td> </td><td>Customer Name</td><td>postalcode</td> <tr> <?php if(isset($records)) : foreach ($records as $row) : ?> <tr> <td> <input type=checkbox name="editcustomer[]" id="editcustomer[]" value="<?php echo $row->id ?>"> </td> <td> <input type="text" name="customername_<?php echo $row

How to identify duplicate items gathered from multiple feeds and link to them in a Database

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I have a Database storing details of products which are taken from many sites, and gathered through the individual sites API's. When I call the feed, the details are stored in a database table. The problem I'm having is that because the exact same product is listed on many sites by the seller I end up having duplicate items in my database, and then when I display them on a web page there are many duplicates. The problem is that the item doesn't have any obvious unique identifier, it has specific details of the item (of which there could be many), and then a description of the item from the