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                            # 添加字段 columns
字段條件 $mixCols 用法和 table 中的 $mixCols 一致。
~~~
# 函數原型
public function columns($mixCols = '*', $strTable = null)

# SELECT `test`.*,`test`.`id`,`test`.`name`,`test`.`value`  FROM `test`
database::table ( 'test' )
    ->columns('id')
    ->columns('name,value')
    ->get ();
~~~

# 設置字段 setColumns
清空原有字段，然后添加新的字段。
~~~
# 函數原型
public function setColumns($mixCols = '*', $strTable = null)

# SELECT `test`.`remark`  FROM `test`
database::table ( 'test' )
    ->columns('id')
    ->columns('name,value')
    ->setColumns('remark')
    ->get ();
~~~

# 字段映射 columnsMapping
第一個參數可以為字符串或者數組，第一個參數為字符串的，第二個參數為 null，則刪除對應的隱射。
~~~
# 函數原型
public function columnsMapping($mixName, $sMappingTo = NULL)

# SELECT `test`.*  FROM `test`  WHERE `test`.`really_id` = 5
database::table ( 'test' )
    ->columnsMapping('id','really_id')
    ->where('id','=',5)
    ->get ();
~~~
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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