str_to_map
功能
将给定的字符串分割成键值对 (Key-Value pair),返回包含这些键值对的 Map。
该函数从 3.1 版本开始支持。
语法
MAP<VARCHAR, VARCHAR> str_to_map(VARCHAR content[, VARCHAR delimiter[, VARCHAR map_delimiter]])
参数说明
content
: 待分割的字符串表达式,必选。delimiter
: 用于将字符串分割成键值对,可选。如果不指定,默认为逗号 (,
)。map_delimiter
: 用于将每个键值对分开,可选。如果不指定,默认为冒号 (:
)。
返回值说明
返回元素为 VARCHAR 的 MAP。如果任何一个输入值为 NULL,则返回 NULL。
示例
mysql> SELECT str_to_map('a:1|b:2|c:3', '|', ':') as map;
+---------------------------+
| map |
+---------------------------+
| {"a":"1","b":"2","c":"3"} |
+---------------------------+
mysql> SELECT str_to_map('a:1;b:2;c:3', ';', ':') as map;
+---------------------------+
| map |
+---------------------------+
| {"a":"1","b":"2","c":"3"} |
+---------------------------+
mysql> SELECT str_to_map('a:1,b:2,c:3', ',', ':') as map;
+---------------------------+
| map |
+---------------------------+
| {"a":"1","b":"2","c":"3"} |
+---------------------------+
mysql> SELECT str_to_map('a') as map;
+------------+
| map |
+------------+
| {"a":null} |
+------------+
mysql> SELECT str_to_map('a:1,b:2,c:3',null, ':') as map;
+------+
| map |
+------+
| NULL |
+------+
mysql> SELECT str_to_map('a:1,b:2,c:null') as map;
+------------------------------+
| map |
+------------------------------+
| {"a":"1","b":"2","c":"null"} |
+------------------------------+
keywords
STR_TO_MAP