1、錯誤：

 Servlet.service() for servlet [dispatcherServlet] in context with path [/system] threw exception [Request processing failed; nested exception is org.springframework.jdbc.BadSqlGrammarException: 
### Error querying database.  Cause: java.sql.SQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for
 
 the right syntax to use near '"test"' at line 1
### The error may exist in file [D:\dev_project\course\system\target\classes\mapper\TestMapper.xml]
### The error may involve defaultParameterMap
### The error occurred while setting parameters
### SQL: SELECT id,name FROM "test"

原因是sql語句有語法問題。

select
 
 “id”，“name” from "user"
其中id和name是user表的欄位，問題在三個都不能加雙引號，user表名加雙引號後報上述錯誤，而欄位名加雙引號會被識別為字串，從而在表中找到相應的字串而不是欄位對應的內容。
故正確寫法如下：
select id，name from user