BITMAP_TO_BASE64

bitmap_to_base64

描述

语法

VARCHAR BITMAP_TO_BASE64(BITMAP input)

将一个bitmap转化成一个base64字符串。输入是null的话返回null。BE配置项enable_set_in_bitmap_value会改变bitmap值在内存中的具体格式，因此会影响此函数的结果。

举例

mysql> select bitmap_to_base64(null);
+------------------------+
| bitmap_to_base64(NULL) |
+------------------------+
| NULL                   |
+------------------------+

mysql> select bitmap_to_base64(bitmap_empty());
+----------------------------------+
| bitmap_to_base64(bitmap_empty()) |
+----------------------------------+
| AA==                             |
+----------------------------------+

mysql> select bitmap_to_base64(to_bitmap(1));
+--------------------------------+
| bitmap_to_base64(to_bitmap(1)) |
+--------------------------------+
| AQEAAAA=                       |
+--------------------------------+

mysql> select bitmap_to_base64(bitmap_from_string("1,9999999"));
+---------------------------------------------------------+
| bitmap_to_base64(bitmap_from_string("1,9999999"))       |
+---------------------------------------------------------+
| AjowAAACAAAAAAAAAJgAAAAYAAAAGgAAAAEAf5Y=                |
+---------------------------------------------------------+

keywords

BITMAP_TO_BASE64,BITMAP