140. Spring Boot MyBatis Upgrade - Annotation - # and $ Symbol Special

 

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The # and $ symbols play a very important role in MyBatis 's SQL parameter injection. These two symbols still need to be understood clearly, otherwise the attacked SQL statement may be written . Well, this article is to solve the respective usage scenarios of # and $ .

 

Outline of this section:

(1) #, $ description

(2) Example description

(3) Practice is more proficient

(4) The blogger has something to say

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Example description:

à Statements using #{} :

@Select("Select * from Demo where name = #{name}")
public List<Demo> selectByName1(@Param("name") String name);

 

Explanation: This example creates a precompiled statement that looks like: select * from Demo where name = ?;

Observe the console's SQL print:

selectByName1    : ==>  Preparing: Select * from Demo where name = ?
DemoMapper.selectByName1    : ==> Parameters: 王五(String)
 
DemoMapper.selectByName1    : <==      Total: 9

 

 

 

 

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