initial commit of laravel!

system/db/query/compiler.php

@@ -0,0 +1,116 @@
+<?php namespace System\DB\Query;
+
+class Compiler {
+
+	/**
+	 * Build a SQL SELECT statement.
+	 *
+	 * @param  Query  $query
+	 * @return string
+	 */
+	public static function select($query)
+	{
+		// ---------------------------------------------------
+		// Add the SELECT, FROM, and WHERE clauses.
+		// ---------------------------------------------------
+		$sql = $query->select.' '.$query->from.' '.$query->where;
+
+		// ---------------------------------------------------
+		// Add the ORDER BY clause.
+		// ---------------------------------------------------
+		if (count($query->orderings) > 0)
+		{
+			$sql .= ' ORDER BY '.implode(', ', $query->orderings);
+		}
+
+		// ---------------------------------------------------
+		// Add the LIMIT.
+		// ---------------------------------------------------
+		if ( ! is_null($query->limit))
+		{
+			$sql .= ' LIMIT '.$query->limit;
+		}
+
+		// ---------------------------------------------------
+		// Add the OFFSET.
+		// ---------------------------------------------------
+		if ( ! is_null($query->offset))
+		{
+			$sql .= ' OFFSET '.$query->offset;
+		}
+
+		return $sql;
+	}
+
+	/**
+	 * Build a SQL INSERT statement.
+	 *
+	 * @param  Query   $query
+	 * @param  array   $values
+	 * @return string
+	 */
+	public static function insert($query, $values)
+	{
+		// ---------------------------------------------------
+		// Start the query. Add the table name.
+		// ---------------------------------------------------
+		$sql = 'INSERT INTO '.$query->table.' (';
+
+		// ---------------------------------------------------
+		// Wrap each column name in keyword identifiers.
+		// ---------------------------------------------------
+		$columns = array();
+
+		foreach (array_keys($values) as $column)
+		{
+			$columns[] = $query->wrap($column);
+		}
+
+		// ---------------------------------------------------
+		// Concatenate the column names and values.
+		// ---------------------------------------------------
+		return $sql .= implode(', ', $columns).') VALUES ('.$query->parameterize($values).')';
+	}
+
+	/**
+	 * Build a SQL UPDATE statement.
+	 *
+	 * @param  Query   $query
+	 * @param  array   $values
+	 * @return string
+	 */
+	public static function update($query, $values)
+	{
+		// ---------------------------------------------------
+		// Start the query. Add the table name.
+		// ---------------------------------------------------
+		$sql = 'UPDATE '.$query->table.' SET ';
+
+		// ---------------------------------------------------
+		// Wrap each column name in keyword identifiers.
+		// ---------------------------------------------------
+		$columns = array();
+
+		foreach (array_keys($values) as $column)
+		{
+			$columns[] = $query->wrap($column).' = ?';
+		}
+
+		// ---------------------------------------------------
+		// Concatenate the column names and the WHERE clause.
+		// ---------------------------------------------------
+		return $sql .= implode(', ', $columns).' '.$query->where;		
+	}
+
+	/**
+	 * Build a SQL DELETE statement.
+	 *
+	 * @param  Query  $query
+	 * @return string
+	 */
+	public static function delete($query)
+	{
+		return 'DELETE FROM '.$query->wrap($query->table).' '.$query->where;
+	}
+
+}