Laravel Course

- Updates
- Deletes

Laravel's database query builder provides a convenient, fluent interface to creating and running database queries.
- It uses PDO parameter binding to protect your application against SQL injection. There is no need to clean strings passed as bindings.

First, add the DB facade in your controller:
use Illuminate\Support\Facades\DB;
Then, you may use the table() method on the DB facade to begin a query.

Inserts

To execute Inserts statements with query builder, use the insert() method. It accepts an array of column names and values.
DB::table('users')->insert(['name'=>'MarPlo', 'votes'=>0]);
- To insert several records into the table with a single call to insert(), pass an array of arrays.
DB::table('users')->insert([
 ['name'=>'MarPlo', 'votes'=>0],
 ['name'=>'PloMar', 'votes'=>0]
]);

Auto-Incrementing ID

If the table has an AUTO-INCREMENTING id, use the insertGetId() method to insert a record and then retrieve the ID.
$id = DB::table('users')->insertGetId(['name'=>'MarPlo', 'votes'=>0]);

Updates

To update records in MySQL with query builder, use the update() method. It accepts an array of column names and values.
You may also use where() clauses.
DB::table('users')->where('id', 1)->update(['votes'=>1]);
- When updating a JSON column (on databases that support JSON columns), use "->" syntax to access the appropriate key in the JSON object.
DB::table('users')->where('id', 1)->update(['options->enabled'=>true]);

Increment / Decrement

For incrementing or decrementing the value of a column, you may use the increment('col', $nr) / decrement('col', $nr) methods.
The first argument is the 'column name', the second argument is optional, a number to control the amount by which the column should be incremented or decremented.
DB::table('users')->increment('votes');

DB::table('users')->increment('votes', 5);

DB::table('users')->decrement('votes');

DB::table('users')->decrement('votes', 5);
- You may also specify additional columns to update during the operation.
DB::table('users')->increment('votes', 1, ['name'=>'MarPlo']);

Deletes

To delete records in MySQL with query builder, use the delete() method.
You may also use where() clauses.
DB::table('users')->where('votes', '>', 10)->delete();
- If you wish to truncate the entire table (which will remove all rows and reset the auto-incrementing ID to zero), you may use the truncate() method.
DB::table('users')->truncate();


- Documentation: Laravel - Database: Query Builder

Daily Test with Code Example

HTML
CSS
JavaScript
PHP-MySQL
Which tag is used in <table> to create table header cell?
<thead> <th> <td>
<table><tr>
  <th>Title 1</th>
  <th>Title 2</th>
</tr></table>
Which CSS property sets the distance between lines?
line-height word-spacing margin
.some_class {
  line-height: 150%;
}
Which function opens a new browser window.
alert() confirm() open()
document.getElementById("id_button").onclick = function(){
  window.open("http://coursesweb.net/");
}
Indicate the PHP function that returns an array with names of the files and folders inside a directory.
mkdir() scandir() readdir()
$ar_dir = scandir("dir_name");
var_export($ar_dir);
MySQL Query Builder: Insert, Update, Delete

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