#14 - Add SQL restriction and projection as fallbacks

Author: technicalguru

src/TgDatabase/Criterion/SqlExpression.php

@@ -0,0 +1,24 @@
+<?php
+
+namespace TgDatabase\Criterion;
+
+use TgDatabase\Criteria;
+use TgDatabase\Criterion;
+
+class SqlExpression implements Criterion {
+
+	public function __construct($sql) {
+		$this->sql = $sql;
+	}
+
+	/**
+	  * Render the SQL fragment.
+	  * @param Criteria $localCriteria   - local criteria object (e.g. subquery)
+	  * @param Criteria $overallCriteria - overall criteria object
+	  * @return string - the SQL fragment representing this criterion.
+	  */
+	public function toSqlString($localCriteria, $overallCriteria) {
+		return $this->sql;
+	}
+	
+}

src/TgDatabase/Criterion/SqlProjection.php

@@ -0,0 +1,24 @@
+<?php
+
+namespace TgDatabase\Criterion;
+
+use TgDatabase\Criteria;
+use TgDatabase\Projection;
+
+class SqlProjection implements Projection {
+
+	public function __construct($sql) {
+		$this->sql = $sql;
+	}
+
+	/**
+	  * Render the SQL fragment.
+	  * @param Criteria $localCriteria   - local criteria object (e.g. subquery)
+	  * @param Criteria $overallCriteria - overall criteria object
+	  * @return string - the SQL fragment representing this criterion.
+	  */
+	public function toSqlString($localCriteria, $overallCriteria) {
+		return $this->sql;
+	}
+	
+}

src/TgDatabase/Projections.php

@@ -7,6 +7,7 @@
 use TgDatabase\Criterion\CountProjection;
 use TgDatabase\Criterion\AggregateProjection;
 use TgDatabase\Criterion\AliasedProjection;
+use TgDatabase\Criterion\SqlProjection;
 
 class Projections {
 
@@ -45,4 +46,10 @@ public static function sum($propertyName) {
 	public static function alias($projection, $alias) {
 		return new AliasedProjection($projection, $alias);
 	}
+	
+	public static function sql($sql) {
+		return new SqlProjection($sql);
+	}
+
+	
 }

src/TgDatabase/Restrictions.php

@@ -10,6 +10,7 @@
 use TgDatabase\Criterion\NotInExpression;
 use TgDatabase\Criterion\PropertyExpression;
 use TgDatabase\Criterion\BetweenExpression;
+use TgDatabase\Criterion\SqlExpression;
 
 /**
   * Provides the built-in citerions.
@@ -172,5 +173,12 @@ public static function leProperty($propertyName1, $propertyName2) {
 		return new PropertyExpression($propertyName1, $propertyName2, '<=');
 	}
 
+	/**
+	  * Apply a SQL constraint. (Exists as fallback to enable other expressions not supported yet)
+	  */
+	public static function sql($sql) {
+		return new SqlExpression($sql);
+	}
 
+	
 }