Expressions

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Expressions can be used to build complex queries. Using an expression to add a complex filter condition is simply a matter of passing a closure to the condition method. You can use then the object passed to the closure as an argument, to build your custom expressions. The methods used to build expressions are column, op and value.

$result = $db->from('numbers')
             ->where('c')->eq(function($expr){
                $expr->column('b')->op('+')->value(10);
             })
             ->select()
             ->all();

SELECT * FROM `numbers` WHERE `c` = `b` + 10

The column method is used to add to the expression a value that must be treated as a column name. The value method is used to add an arbitrary value that must treated as user input and handled properly. The op method is used to add a raw value to the expression.

The op method can be replaced by curly brackets.

$result = $db->from('numbers')
             ->where('c')->eq(function($expr){
                $expr->column('a')->{'+'}->column('b');
             })
             ->select()
             ->all();

SELECT * FROM `numbers` WHERE `c` = `a` + `b`