【Mybatis】使用LambdaQueryWrapper后讓控制台輸出執行的SQL語句

本文適用於SpringBoot2.5.4，Mybatis2.2.0，mybatis-plus3.0.5版本，不保證在其它版本的適用性。

與本文相關的姊妹篇：https://www.cnblogs.com/heyang78/p/15369564.html

本文例程：https://files.cnblogs.com/files/heyang78/redisCache_mybatisplus_printsql_211006.rar

使用LambdaQueryWrapper后，簡單查詢是方便了，但有時需要把SQL顯示出來，要做到這一步在yml文件里加入相應配置就好了。

server:
    port: 8080
myenv:
    name: '開發環境'   
spring: 
    datasource:
        url: jdbc:oracle:thin:@127.0.0.1:1521:orclhy78
        username: luna
        password: 1234
        driver-class-name: oracle.jdbc.OracleDriver
#mybatis-plus配置控制台打印完整帶參數SQL語句
mybatis-plus: configuration: log-impl: org.apache.ibatis.logging.stdout.StdOutImpl

有了這個設置后，控制台就有sql輸出了：

有請求來到，其路徑=/searchEmpsByAge
Creating a new SqlSession
SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@e73a277] was not registered for synchronization because synchronization is not active
JDBC Connection [HikariProxyConnection@1331295536 wrapping oracle.jdbc.driver.T4CConnection@ab2e6d2] will not be managed by Spring
==>  Preparing: SELECT id,name,age FROM emp WHERE age = ?
==> Parameters: 42(Integer)
<==    Columns: ID, NAME, AGE
<==        Row: 3, 李逵, 42
<==        Row: 1, 2222, 42
<==        Row: 2, 3333, 42
<==      Total: 3
Closing non transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@e73a277]
2021-10-06 16:58:16.750  WARN 24752 --- [l-1 housekeeper] com.zaxxer.hikari.pool.HikariPool        : HikariPool-1 - Thread starvation or clock leap detected (housekeeper delta=2h32s442ms568µs700ns).

參考文章：

https://blog.csdn.net/qq_40684649/article/details/111246669