* Add sql check and modify zentao sql.

module/dataview/lang/de.php

@@ -56,6 +56,7 @@ $lang->dataview->default        = 'Default Group';
 $lang->dataview->relatedTable   = 'Table';
 $lang->dataview->relatedField   = 'Field';
 $lang->dataview->multilingual   = 'After switching the system language, the corresponding name will be displayed';
+$lang->dataview->duplicateField = 'Duplicate field names exist: <strong>%s</strong>. You are advised to: (1) Modify the <strong>*</strong> query to a specific field. (2) Use <strong>as</strong> to alias the field.';
 
 $lang->dataview->varFilter = new stdclass();
 $lang->dataview->varFilter->varCode     = 'Var Code';

module/dataview/lang/en.php

@@ -56,6 +56,7 @@ $lang->dataview->default        = 'Default Group';
 $lang->dataview->relatedTable   = 'Table';
 $lang->dataview->relatedField   = 'Field';
 $lang->dataview->multilingual   = 'After switching the system language, the corresponding name will be displayed';
+$lang->dataview->duplicateField = 'Duplicate field names exist: <strong>%s</strong>. You are advised to: (1) Modify the <strong>*</strong> query to a specific field. (2) Use <strong>as</strong> to alias the field.';
 
 $lang->dataview->varFilter = new stdclass();
 $lang->dataview->varFilter->varCode     = 'Var Code';

module/dataview/lang/fr.php

@@ -56,6 +56,7 @@ $lang->dataview->default        = 'Default Group';
 $lang->dataview->relatedTable   = 'Table';
 $lang->dataview->relatedField   = 'Field';
 $lang->dataview->multilingual   = 'After switching the system language, the corresponding name will be displayed';
+$lang->dataview->duplicateField = 'Duplicate field names exist: <strong>%s</strong>. You are advised to: (1) Modify the <strong>*</strong> query to a specific field. (2) Use <strong>as</strong> to alias the field.';
 
 $lang->dataview->varFilter = new stdclass();
 $lang->dataview->varFilter->varCode     = 'Var Code';

module/dataview/lang/zh-cn.php

@@ -56,6 +56,7 @@ $lang->dataview->default        = '默认分组';
 $lang->dataview->relatedTable   = '所属表';
 $lang->dataview->relatedField   = '对应字段';
 $lang->dataview->multilingual   = '切换系统语言项后，将显示对应名称';
+$lang->dataview->duplicateField = '存在重复的字段名： <strong>%s</strong>。建议您：（1）修改 <strong>*</strong> 查询为具体的字段。（2）使用 <strong>as</strong> 为字段设置别名。';
 
 $lang->dataview->varFilter = new stdclass();
 $lang->dataview->varFilter->varCode     = '变量代号';

module/dataview/model.php

@@ -168,6 +168,37 @@ class dataviewModel extends model
         return $columnTypes;
     }
 
+    /**
+     * Check that the column of an sql query is unique.
+     *
+     * @param  string $sql
+     * @param  bool   $repeat
+     * @access public
+     * @return bool
+     */
+    public function checkUniColumn($sql, $repeat = false)
+    {
+        $columns = $this->dao->getColumns($sql);
+
+        $isUnique     = true;
+        $columnList   = array();
+        $repeatColumn = array();
+        foreach($columns as $column)
+        {
+            $field = $column['name'];
+            if(isset($columnTypes[$field]))
+            {
+                $isUnique = false;
+                $repeatColumn[$field] = $field;
+            }
+
+            $columnTypes[$field] = $field;
+        }
+
+        if($repeat) return array($isUnique, $repeatColumn);
+        return $isUnique;
+    }
+
     /**
      * Get type options
      *