Add SqlCriteria class. Add SqlModel.find() with use SqlCriteria.

model/SqlCriteria.php

@@ -0,0 +1,86 @@
+<?php
+
+class SqlCriteria
+{
+    public $select = array('*');
+
+    public $distinct = '';
+
+    public $where = array();
+
+    public $order = array();
+
+    public $limit = '';
+
+    /**
+     * @return SqlCriteria
+     */
+    public static function getInstance()
+    {
+        return self;
+    }
+
+    /**
+     * @param $conditions array @ex array('field=?' => $value, 'field in ? => new DbExpr('(1,2,3)'))
+     * @return SqlCriteria
+     */
+    public function where($conditions)
+    {
+        $this->where = $conditions;
+        return $this;
+    }
+
+    /**
+     * @param $fields array()
+     * @param array $fields_to_desc
+     * @return SqlCriteria
+     */
+    public function order($fields, $fields_to_desc = array())
+    {
+        if (!is_array($fields)) {
+            $fields = array($fields);
+        }
+        foreach ($fields as  $term) {
+            $term = $this->db->quoteIdentifier($term) . (in_array($term, $fields_to_desc) ? ' DESC' : '');
+        }
+        $this->order = implode(',', $fields);
+        return $this;
+    }
+
+    /**
+     * @param $limit int
+     * @param $offset int
+     * @return SqlCriteria
+     */
+    public function limit($limit, $offset = 0)
+    {
+        if (empty($offset)) {
+            $this->limit = (int) $limit;
+        }
+        $this->limit = (int)$limit . ',' . (int) $offset;
+        return $this;
+    }
+
+    /**
+     * @param mixed $select array @ex array('field1', 'field2', 'field3' => 'field')
+     * @return string
+     */
+    public function select($select)
+    {
+        if (!is_array($select)) {
+            $select = array($select);
+        }
+        $this->select = implode(',', $select);
+        return $this;
+    }
+
+    /**
+     * @param $field string
+     * @return SqlCriteria
+     */
+    public function distinct($field)
+    {
+        $this->distinct = $field;
+        return $this;
+    }
+}