使用REGEXP進行MYSQL查詢 - make-it非貪婪

Question

我需要一些MYSQL查詢正則表達式的幫助來搜索包含具有精確模式的單元格的行。我是MYSQL正則表達式的新手。

這是命名爲TEST_TABLE一個示例表（json_value是一個數組的JSON字符串）

|id | json_value                     
----------------------------------------------------------------------------------------------- 
| 1 | {"field_198":false,"field_4":"From quality office","field_9":"product with high quality","field_10":"comment"}  
| 2 | {"field_198":true,"field_4":"From ordering office","field_9":"back to quality office","field_10":"comment"} 
| 3 | {"field_198":true,"field_4":"From ordering office","field_9":"cancelled","field_10":"comment"}      
| 4 | {"field_198":true,"field_4":"Return to quality office","field_9":"product ok","field_10":"comment"} 

如果我想獲得的所有行：

- field_4 containing "quality" string, the query should to return id 1 and 4 
- field_9 containing "quality" string, the query should to return id 1 and 2 
- field_4 containing "ordering" string, the query should to return id 2 and 3 

我希望的例子是concludent。

我曾嘗試使用此查詢

SELECT id from test_table WHERE json_value REGEXP 'field_4":".*quality.*'; 

但field_9第2行

另一個查詢返回id爲1，2和4，因爲是貪婪，找到了「質量」（我知道，這是一個愚蠢的正則表達式）

SELECT id from test_table WHERE json_value REGEXP 'field_4":"[^quality]*quality.*'; 

但僅返回ID 1

我已經readed很多在互聯網上的帖子，但沒有成功。 正則表達式應該如何得到正確的行？

編輯 還有一認爲，要更加明確，從搜索的第一部作品是從陣列中的全鍵，但第二部分的值，如「％字符串％」

謝謝

Answer 1

這是我能想出的最好：

SELECT id from test_table WHERE json_value REGEXP 'field_4":"[^"]*quality'; 

它符合你的要求給你提供的數據。這將打破，但是，如果你的JSON包含嵌入式/轉義雙引號，如：

+----+----------------------------------------------------------------------------------------------------------------+ 
| id | json_value                          | 
+----+----------------------------------------------------------------------------------------------------------------+ 
| 1 | {"field_198":false,"field_4":"From quality office","field_9":"product with high quality","field_10":"comment"} | 
| 2 | {"field_198":true,"field_4":"From ordering office","field_9":"back to quality office","field_10":"comment"} | 
| 3 | {"field_198":true,"field_4":"From ordering office","field_9":"cancelled","field_10":"comment"}     | 
| 4 | {"field_198":true,"field_4":"Return to quality office","field_9":"product ok","field_10":"comment"}   | 
| 5 | {"field_198":true,"field_4":"Return to \"quality\" office","field_9":"product ok","field_10":"comment"}  | 
+----+----------------------------------------------------------------------------------------------------------------+ 
5 rows in set (0.00 sec) 

mysql> SELECT id from test_table WHERE json_value REGEXP 'field_4":"[^"]*quality'; 
+----+ 
| id | 
+----+ 
| 1 | 
| 4 | 
+----+ 
2 rows in set (0.01 sec) 

在這種情況下，我認爲你所想要的行與要返回id=5，但事實並非如此。但是如果你有這樣的數據，我認爲你別無選擇，只能真正解析它，而正則表達式不會做到這一點。