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Passing an array of values to the execute() method

From: Accessing Databases with Object-Oriented PHP

Video: Passing an array of values to the execute() method

In addition to binding values to placeholders And the double arrow operator for the value.

Passing an array of values to the execute() method

In addition to binding values to placeholders with the bindParam and bindValue methods, PDO allows you to pass the values directly to the execute method as an array. When you do this, all values are treated as strings. You can either define the array first or create it directly between the parentheses of the execute method. We'll look at both ways. This is pdo_named_excute.php, which you can find in the chapter three 03_04 folder of the exercise files.

It's exactly the same file as the one we created earlier using named parameters. Because the parameters have names, you need to create an associative array using the name as the key for each value. Because they're individually named, they can be in any order. So, let's create a new array. We'll create it after preparing the statement. We'll call the array values and just because we can, let's put them in a different order.

So, we'll start off with colon price. And the double arrow operator for the value. That comes directly from the get array, from get price. And a comma and our next value. This time we'll have :make. This needs to begin with the wild card character concatenated with the value from the get array. And another wildcard character, and then our final array element will be yearmade, followed by its value. Now that we've created this array we don't need to bind the values using bindValue or bindParam so we can delete lines 14, 15 and 16, and then just pass the values array directly to the execute method.

So, if we save that and run it in a browser, it should work exactly as before. So let's see if we can find some, I don't know, fords. Here we are. It's working exactly as you would expect. Now we did put price in the wrong order. So let's just test that again. We've got a Ford here that is worth 10,980. So, if we look for fords again. And set the maximum price to 10,000, this one should not be displayed.

And it's working exactly as we would like it to do. And the reason for that, of course, is because we do have named parameters. And the names are identified in the associative array so it doesn't matter which order they're in. So, let's see how it works with anonymous placeholders. This is pdo_anonymous_execute.php, which you can find in the same chapter three, 03_04 folder of the exercise files. It's the same file that we used before with anonymous placeholders. Because there are known names with an anonymous placeholder, you create an indexed array without keys.

So the values this time must be in exactly the same order as the placeholders. That means we need to have make, yearmade and price in that order. Let's do it directly between the parentheses of the execute method so we can get rid of the bindValue and bindParam lines and then we'll create an anonymous array directly inside there between the parentheses. The first value needs to be make. So that begins with the placeholder character, concatenated with the value from the GET array, and concatenated with another placeholder character. Then, a comma for the next array element. This is going to be yearmade. That also comes from the GET array, we just go to it directly. And the final value in that array needs to be price.

So, if we save that and load this page in a browser, it should work exactly the same as the other pages. So, we'll look for BMWs. There it is, it's working perfectly. Passing the values directly as an array to the execute method is a convenient shorthand, but it does have the disadvantage that all values are passed as strings. That means you can't insert a null value. With anonymous parameters, there's also a danger of getting them in the wrong order if you make any changes to the SQL.

However, it is worth considering passing the values directly to the execute method if the prepared statement takes only a single input value. But with a single value, the argument passed to the execute method still needs to be an array. Just make sure it's an array with a single element.

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This video is part of

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Accessing Databases with Object-Oriented PHP

47 video lessons · 3038 viewers

David Powers
Author

 
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  1. 13m 33s
    1. Welcome
      1m 4s
    2. What you should know before watching this course
      2m 8s
    3. Using the exercise files
      4m 56s
    4. Setting SQLite permissions
      1m 11s
    5. A quick primer on using PHP objects
      4m 14s
  2. 10m 12s
    1. Overview of PHP database APIs
      4m 5s
    2. Using prepared statements
      4m 24s
    3. Using transactions
      1m 43s
  3. 48m 57s
    1. Creating a database source name
      2m 3s
    2. Connecting to a database with PDO
      7m 27s
    3. Looping directly over a SELECT query
      3m 49s
    4. Fetching a result set
      8m 3s
    5. Finding the number of results from a SELECT query
      7m 14s
    6. Checking if a SELECT query contains results
      3m 32s
    7. Executing simple non-SELECT queries
      6m 2s
    8. Getting error messages
      7m 17s
    9. Using the quote() method to sanitize user input
      3m 30s
  4. 39m 51s
    1. Binding input and output values
      2m 36s
    2. Using named parameters
      9m 51s
    3. Using question marks as anonymous placeholders
      2m 35s
    4. Passing an array of values to the execute() method
      5m 20s
    5. Binding results to variables
      7m 53s
    6. Executing a transaction
      6m 54s
    7. Closing the cursor before running another query
      4m 42s
  5. 21m 20s
    1. Generating an array from a pair of columns
      2m 44s
    2. Setting an existing object's properties with a database result
      4m 42s
    3. Creating an instance of a specific class with a database result
      6m 1s
    4. Reusing a result set
      7m 53s
  6. 38m 14s
    1. Connecting to a database with MySQLi
      5m 57s
    2. Setting the character set
      1m 57s
    3. Submitting a SELECT query and getting the number of results
      4m 4s
    4. Fetching the result
      7m 35s
    5. Rewinding the result for reuse
      3m 20s
    6. Handling non-SELECT queries
      5m 27s
    7. Getting error messages
      5m 47s
    8. Sanitizing user input with real_escape_string()
      4m 7s
  7. 27m 49s
    1. Initializing and preparing a statement
      4m 17s
    2. Binding parameters and executing a prepared statement
      5m 55s
    3. Binding output variables
      5m 6s
    4. Executing a MySQLi transaction
      7m 5s
    5. Dealing with "commands out of sync" in prepared statements
      5m 26s
  8. 24m 7s
    1. Buffered and unbuffered queries
      4m 19s
    2. Using real_query()
      6m 1s
    3. Freeing resources that are no longer needed
      2m 31s
    4. Submitting multiple queries
      6m 41s
    5. Creating an instance of a class from a result set
      4m 35s
  9. 3m 31s
    1. PDO and MySQLi compared
      3m 31s

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