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TODO: Readme must be completed

Custom connections

selectPrefixed

Sometimes you want certain column names to be prepended with a given prefix. Following example prefixes all returned column names with the "user_" prefix:

DB:table('users')->selectPrefixed(['id', 'name'], 'user_')->get();

// => [['user_id' => 1, 'user_name' => 'John']]

This becomes really useful when you're using joins on tables with conflicting column names:

DB:table('users')
    ->join('children', 'users.id', '=', 'children.user_id')
    ->addSelectPrefixed('users.*', 'user_')
    ->addSelectPrefixed('children.*', 'child_')
    ->get();

// => [[ 'user_id' => 1, 'user_name' => 'John', 'child_id' => 12, 'child_name' => 'Maria']]

Without prefixing, the children fields would silently overwrite the users fields. As you see it also works using wildcard column selectors. And the best: it does not produce an extra query to obtain the table structure. In fact it does not depend on table columns at all:

It can also be used with expressions:

DB:table('users')->selectPrefixed(new Expression('count(*) as myCount'), 'user_')->get();

// => [['user_myCount' => 123]]

You can also set multiple prefixes in one call if you omit the prefix parameter and pass an associative array as first parameter

DB:table('users')
    ->join('children', 'users.id', '=', 'children.user_id')
    ->selectPrefixed([
        'user_'  => 'users.*',
        'child_' => ['id', 'name'],
    ])
    ->get();

whereNotNested

If you want to negate a nested where clause, the new whereNotNested function comes in:

DB:table('users')
    ->whereNotNested(function($query) {
        $query->where('name', 'John');
        $query->where('age', '>', 49);
    })
    ->get();

This would produce following query:

SELECT * FROM users WHERE NOT (first_name = 'John' AND age > 49) 

whereMultiIn

Some SQL dialects allow to compare multiple columns using the IN operator. You may use it using the whereMultiIn function:

DB:table('users')
    ->whereMultiIn(['name', 'age'], [
        ['John', 38],
        ['Ida', 49],
    ])
    ->get();

This would produce following query:

SELECT * FROM users WHERE (name, age) IN ( ('John', 38), ('Ida', 49) )

You may even pass a sub select instead of a values array:

DB:table('users')
    ->whereMultiIn(['name', 'age'], function ($query) {
        return $query->select(['parent_name', 'parent_age'])
            ->from('children')
            ->where('age', '<', 3);
    })
    ->get();

whereMultiColumns

The whereMultiColumns accepts multiple columns to be compared:

DB:table('users')
    ->whereMultiColumns(['name', 'age'], ['n', 'a'])
    ->get();

This would produce following query:

SELECT * FROM users WHERE (name = n AND age = a)

Operators are applied to the combination of columns. That's why only =, !=, <> are supported.

DB:table('users')
    ->whereMultiColumns(['name', 'age'], '!=', ['n', 'a'])
    ->get();

This would produce following query:

SELECT * FROM users WHERE NOT (name = n AND age = a)

Automatic where detection

Another improvement is that the where functions now can be used with an array as values parameter, so it get's automatically converted to whereIn. Of course this also works with multiple columns:

DB:table('users')
    ->where('name', ['John', 'Ida'])
    ->get();

DB:table('users')
    ->where(['name', 'age'], [
        ['John', 38],
        ['Ida', 49],
    ])
    ->get();

This works also for the whereColumn functions:

DB:table('users')
    ->whereColumn(['name', 'age'], ['n', 'a'])
    ->get();

Timezone handling

Time zone handling in database can be complicated. Laravel passes dates without timezone information to the database. This behavior is correct as the data is usually stored without any timezone information. When reading dates, Laravel (Eloquent) interprets dates using the default application timezone.

But Laravel does not ensure that DateTime parameters are using the application timezone when passing them to the database. So if you pass a date with a different timezone to database, it will be interpreted using another timezone on reading.

To ensure all DateTime parameters are converted to application timezone before sending them to database, this package adds the "adapt_timezone" configuration option for database connections. If set to true, any DateTime values will be converted to the application timezone before passing them to the database.

The AdaptsAttributeTimezone trait implements the timezone adaption for Eloquent model attributes.

Database session timezone

Some databases, such as MySQL use the database session timezone when converting dates to timestamps (see MySQL Documentation for details). For MySQL this does only affect storing dates to TIMESTAMP columns (not for DATETIME columns) and NOW() and CURTIME() functions. Therefore you should always configure the "timezone" parameter for connections to the same value as the application timezone!