- 插 入
- insert into table1(field1,
- 接插入
- field2) values(value1,value2)
- 删 除
- delete from table1 where 范围
- 选 择
- select * from table1 where范围
- 中文名
- 结构化查询语言
- 总 数
- select count(*) as totalcount
- 外文名
- Structured Query Language
- 接总数
- from table1
-
sql语句练习50题(Mysql版)
2017-12-19 00:11:31习题来源于网络,sql语句是自己写的。欢迎指正。 表名和字段 –1.学生表 Student(s_id,s_name,s_birth,s_sex) –学生编号,学生姓名, 出生年月,学生性别 –2.课程表 Course(c_id,c_name,t_id) – –课程编号, ...习题来源于网络,sql语句是自己写的,部分有参考。欢迎指正。
2019.3.29更新
写完后一年没有看过,没想到这篇文章有这么多人点击。博主工作到一半去考研了,目前已上岸某中部985,也算是比较幸运。非常感谢大家在评论里的留言,留言太多不能一一回复,希望大家见谅。这两天根据评论把文章中的某些错误或者不足的地方更新了下,,希望大家能够继续指出不足之处。表名和字段
–1.学生表
Student(s_id,s_name,s_birth,s_sex) --学生编号,学生姓名, 出生年月,学生性别
–2.课程表
Course(c_id,c_name,t_id) – --课程编号, 课程名称, 教师编号
–3.教师表
Teacher(t_id,t_name) --教师编号,教师姓名
–4.成绩表
Score(s_id,c_id,s_score) --学生编号,课程编号,分数测试数据
--建表 --学生表 CREATE TABLE `Student`( `s_id` VARCHAR(20), `s_name` VARCHAR(20) NOT NULL DEFAULT '', `s_birth` VARCHAR(20) NOT NULL DEFAULT '', `s_sex` VARCHAR(10) NOT NULL DEFAULT '', PRIMARY KEY(`s_id`) ); --课程表 CREATE TABLE `Course`( `c_id` VARCHAR(20), `c_name` VARCHAR(20) NOT NULL DEFAULT '', `t_id` VARCHAR(20) NOT NULL, PRIMARY KEY(`c_id`) ); --教师表 CREATE TABLE `Teacher`( `t_id` VARCHAR(20), `t_name` VARCHAR(20) NOT NULL DEFAULT '', PRIMARY KEY(`t_id`) ); --成绩表 CREATE TABLE `Score`( `s_id` VARCHAR(20), `c_id` VARCHAR(20), `s_score` INT(3), PRIMARY KEY(`s_id`,`c_id`) ); --插入学生表测试数据 insert into Student values('01' , '赵雷' , '1990-01-01' , '男'); insert into Student values('02' , '钱电' , '1990-12-21' , '男'); insert into Student values('03' , '孙风' , '1990-05-20' , '男'); insert into Student values('04' , '李云' , '1990-08-06' , '男'); insert into Student values('05' , '周梅' , '1991-12-01' , '女'); insert into Student values('06' , '吴兰' , '1992-03-01' , '女'); insert into Student values('07' , '郑竹' , '1989-07-01' , '女'); insert into Student values('08' , '王菊' , '1990-01-20' , '女'); --课程表测试数据 insert into Course values('01' , '语文' , '02'); insert into Course values('02' , '数学' , '01'); insert into Course values('03' , '英语' , '03'); --教师表测试数据 insert into Teacher values('01' , '张三'); insert into Teacher values('02' , '李四'); insert into Teacher values('03' , '王五'); --成绩表测试数据 insert into Score values('01' , '01' , 80); insert into Score values('01' , '02' , 90); insert into Score values('01' , '03' , 99); insert into Score values('02' , '01' , 70); insert into Score values('02' , '02' , 60); insert into Score values('02' , '03' , 80); insert into Score values('03' , '01' , 80); insert into Score values('03' , '02' , 80); insert into Score values('03' , '03' , 80); insert into Score values('04' , '01' , 50); insert into Score values('04' , '02' , 30); insert into Score values('04' , '03' , 20); insert into Score values('05' , '01' , 76); insert into Score values('05' , '02' , 87); insert into Score values('06' , '01' , 31); insert into Score values('06' , '03' , 34); insert into Score values('07' , '02' , 89); insert into Score values('07' , '03' , 98);
练习题和sql语句
-- 1、查询"01"课程比"02"课程成绩高的学生的信息及课程分数 select a.* ,b.s_score as 01_score,c.s_score as 02_score from student a join score b on a.s_id=b.s_id and b.c_id='01' left join score c on a.s_id=c.s_id and c.c_id='02' or c.c_id = NULL where b.s_score>c.s_score --也可以这样写 select a.*,b.s_score as 01_score,c.s_score as 02_score from student a,score b,score c where a.s_id=b.s_id and a.s_id=c.s_id and b.c_id='01' and c.c_id='02' and b.s_score>c.s_score -- 2、查询"01"课程比"02"课程成绩低的学生的信息及课程分数 select a.* ,b.s_score as 01_score,c.s_score as 02_score from student a left join score b on a.s_id=b.s_id and b.c_id='01' or b.c_id=NULL join score c on a.s_id=c.s_id and c.c_id='02' where b.s_score<c.s_score -- 3、查询平均成绩大于等于60分的同学的学生编号和学生姓名和平均成绩 select b.s_id,b.s_name,ROUND(AVG(a.s_score),2) as avg_score from student b join score a on b.s_id = a.s_id GROUP BY b.s_id,b.s_name HAVING avg_score >=60; -- 4、查询平均成绩小于60分的同学的学生编号和学生姓名和平均成绩 -- (包括有成绩的和无成绩的) select b.s_id,b.s_name,ROUND(AVG(a.s_score),2) as avg_score from student b left join score a on b.s_id = a.s_id GROUP BY b.s_id,b.s_name HAVING avg_score <60 union select a.s_id,a.s_name,0 as avg_score from student a where a.s_id not in ( select distinct s_id from score); -- 5、查询所有同学的学生编号、学生姓名、选课总数、所有课程的总成绩 select a.s_id,a.s_name,count(b.c_id) as sum_course,sum(b.s_score) as sum_score from student a left join score b on a.s_id=b.s_id GROUP BY a.s_id,a.s_name; -- 6、查询"李"姓老师的数量 select count(t_id) from teacher where t_name like '李%'; -- 7、查询学过"张三"老师授课的同学的信息 select a.* from student a join score b on a.s_id=b.s_id where b.c_id in( select c_id from course where t_id =( select t_id from teacher where t_name = '张三')); -- 8、查询没学过"张三"老师授课的同学的信息 select * from student c where c.s_id not in( select a.s_id from student a join score b on a.s_id=b.s_id where b.c_id in( select a.c_id from course a join teacher b on a.t_id = b.t_id where t_name ='张三')); -- 9、查询学过编号为"01"并且也学过编号为"02"的课程的同学的信息 select a.* from student a,score b,score c where a.s_id = b.s_id and a.s_id = c.s_id and b.c_id='01' and c.c_id='02'; -- 10、查询学过编号为"01"但是没有学过编号为"02"的课程的同学的信息 select a.* from student a where a.s_id in (select s_id from score where c_id='01' ) and a.s_id not in(select s_id from score where c_id='02') -- 11、查询没有学全所有课程的同学的信息 --@wendiepei的写法 select s.* from student s left join Score s1 on s1.s_id=s.s_id group by s.s_id having count(s1.c_id)<(select count(*) from course) --@k1051785839的写法 select * from student where s_id not in( select s_id from score t1 group by s_id having count(*) =(select count(distinct c_id) from course)) -- 12、查询至少有一门课与学号为"01"的同学所学相同的同学的信息 select * from student where s_id in( select distinct a.s_id from score a where a.c_id in(select a.c_id from score a where a.s_id='01') ); -- 13、查询和"01"号的同学学习的课程完全相同的其他同学的信息 --@ouyang_1993的写法 SELECT Student.* FROM Student WHERE s_id IN (SELECT s_id FROM Score GROUP BY s_id HAVING COUNT(s_id) = ( #下面的语句是找到'01'同学学习的课程数 SELECT COUNT(c_id) FROM Score WHERE s_id = '01' ) ) AND s_id NOT IN ( #下面的语句是找到学过‘01’同学没学过的课程,有哪些同学。并排除他们 SELECT s_id FROM Score WHERE c_id IN( #下面的语句是找到‘01’同学没学过的课程 SELECT DISTINCT c_id FROM Score WHERE c_id NOT IN ( #下面的语句是找出‘01’同学学习的课程 SELECT c_id FROM Score WHERE s_id = '01' ) ) GROUP BY s_id ) #下面的条件是排除01同学 AND s_id NOT IN ('01') --@k1051785839的写法 SELECT t3.* FROM ( SELECT s_id, group_concat(c_id ORDER BY c_id) group1 FROM score WHERE s_id <> '01' GROUP BY s_id ) t1 INNER JOIN ( SELECT group_concat(c_id ORDER BY c_id) group2 FROM score WHERE s_id = '01' GROUP BY s_id ) t2 ON t1.group1 = t2.group2 INNER JOIN student t3 ON t1.s_id = t3.s_id -- 14、查询没学过"张三"老师讲授的任一门课程的学生姓名 select a.s_name from student a where a.s_id not in ( select s_id from score where c_id = (select c_id from course where t_id =( select t_id from teacher where t_name = '张三'))); -- 15、查询两门及其以上不及格课程的同学的学号,姓名及其平均成绩 select a.s_id,a.s_name,ROUND(AVG(b.s_score)) from student a left join score b on a.s_id = b.s_id where a.s_id in( select s_id from score where s_score<60 GROUP BY s_id having count(1)>=2) GROUP BY a.s_id,a.s_name -- 16、检索"01"课程分数小于60,按分数降序排列的学生信息 select a.*,b.c_id,b.s_score from student a,score b where a.s_id = b.s_id and b.c_id='01' and b.s_score<60 ORDER BY b.s_score DESC; -- 17、按平均成绩从高到低显示所有学生的所有课程的成绩以及平均成绩 select a.s_id,(select s_score from score where s_id=a.s_id and c_id='01') as 语文, (select s_score from score where s_id=a.s_id and c_id='02') as 数学, (select s_score from score where s_id=a.s_id and c_id='03') as 英语, round(avg(s_score),2) as 平均分 from score a GROUP BY a.s_id ORDER BY 平均分 DESC; --@喝完这杯还有一箱的写法 SELECT a.s_id,MAX(CASE a.c_id WHEN '01' THEN a.s_score END ) 语文, MAX(CASE a.c_id WHEN '02' THEN a.s_score END ) 数学, MAX(CASE a.c_id WHEN '03' THEN a.s_score END ) 英语, avg(a.s_score),b.s_name FROM Score a JOIN Student b ON a.s_id=b.s_id GROUP BY a.s_id ORDER BY 5 DESC -- 18.查询各科成绩最高分、最低分和平均分:以如下形式显示:课程ID,课程name,最高分,最低分,平均分,及格率,中等率,优良率,优秀率 --及格为>=60,中等为:70-80,优良为:80-90,优秀为:>=90 select a.c_id,b.c_name,MAX(s_score),MIN(s_score),ROUND(AVG(s_score),2), ROUND(100*(SUM(case when a.s_score>=60 then 1 else 0 end)/SUM(case when a.s_score then 1 else 0 end)),2) as 及格率, ROUND(100*(SUM(case when a.s_score>=70 and a.s_score<=80 then 1 else 0 end)/SUM(case when a.s_score then 1 else 0 end)),2) as 中等率, ROUND(100*(SUM(case when a.s_score>=80 and a.s_score<=90 then 1 else 0 end)/SUM(case when a.s_score then 1 else 0 end)),2) as 优良率, ROUND(100*(SUM(case when a.s_score>=90 then 1 else 0 end)/SUM(case when a.s_score then 1 else 0 end)),2) as 优秀率 from score a left join course b on a.c_id = b.c_id GROUP BY a.c_id,b.c_name -- 19、按各科成绩进行排序,并显示排名 -- mysql没有rank函数 select a.s_id,a.c_id, @i:=@i +1 as i保留排名, @k:=(case when @score=a.s_score then @k else @i end) as rank不保留排名, @score:=a.s_score as score from ( select s_id,c_id,s_score from score GROUP BY s_id,c_id,s_score ORDER BY s_score DESC )a,(select @k:=0,@i:=0,@score:=0)s --@k1051785839的写法 (select * from (select t1.c_id, t1.s_score, (select count(distinct t2.s_score) from score t2 where t2.s_score>=t1.s_score and t2.c_id='01') rank FROM score t1 where t1.c_id='01' order by t1.s_score desc) t1) union (select * from (select t1.c_id, t1.s_score, (select count(distinct t2.s_score) from score t2 where t2.s_score>=t1.s_score and t2.c_id='02') rank FROM score t1 where t1.c_id='02' order by t1.s_score desc) t2) union (select * from (select t1.c_id, t1.s_score, (select count(distinct t2.s_score) from score t2 where t2.s_score>=t1.s_score and t2.c_id='03') rank FROM score t1 where t1.c_id='03' order by t1.s_score desc) t3) -- 20、查询学生的总成绩并进行排名 select a.s_id, @i:=@i+1 as i, @k:=(case when @score=a.sum_score then @k else @i end) as rank, @score:=a.sum_score as score from (select s_id,SUM(s_score) as sum_score from score GROUP BY s_id ORDER BY sum_score DESC)a, (select @k:=0,@i:=0,@score:=0)s -- 21、查询不同老师所教不同课程平均分从高到低显示 select a.t_id,c.t_name,a.c_id,ROUND(avg(s_score),2) as avg_score from course a left join score b on a.c_id=b.c_id left join teacher c on a.t_id=c.t_id GROUP BY a.c_id,a.t_id,c.t_name ORDER BY avg_score DESC; -- 22、查询所有课程的成绩第2名到第3名的学生信息及该课程成绩 select d.*,c.排名,c.s_score,c.c_id from ( select a.s_id,a.s_score,a.c_id,@i:=@i+1 as 排名 from score a,(select @i:=0)s where a.c_id='01' ORDER BY a.s_score DESC )c left join student d on c.s_id=d.s_id where 排名 BETWEEN 2 AND 3 UNION select d.*,c.排名,c.s_score,c.c_id from ( select a.s_id,a.s_score,a.c_id,@j:=@j+1 as 排名 from score a,(select @j:=0)s where a.c_id='02' ORDER BY a.s_score DESC )c left join student d on c.s_id=d.s_id where 排名 BETWEEN 2 AND 3 UNION select d.*,c.排名,c.s_score,c.c_id from ( select a.s_id,a.s_score,a.c_id,@k:=@k+1 as 排名 from score a,(select @k:=0)s where a.c_id='03' ORDER BY a.s_score DESC )c left join student d on c.s_id=d.s_id where 排名 BETWEEN 2 AND 3; -- 23、统计各科成绩各分数段人数:课程编号,课程名称,[100-85],[85-70],[70-60],[0-60]及所占百分比 select distinct f.c_name,a.c_id,b.`85-100`,b.百分比,c.`70-85`,c.百分比,d.`60-70`,d.百分比,e.`0-60`,e.百分比 from score a left join (select c_id,SUM(case when s_score >85 and s_score <=100 then 1 else 0 end) as `85-100`, ROUND(100*(SUM(case when s_score >85 and s_score <=100 then 1 else 0 end)/count(*)),2) as 百分比 from score GROUP BY c_id)b on a.c_id=b.c_id left join (select c_id,SUM(case when s_score >70 and s_score <=85 then 1 else 0 end) as `70-85`, ROUND(100*(SUM(case when s_score >70 and s_score <=85 then 1 else 0 end)/count(*)),2) as 百分比 from score GROUP BY c_id)c on a.c_id=c.c_id left join (select c_id,SUM(case when s_score >60 and s_score <=70 then 1 else 0 end) as `60-70`, ROUND(100*(SUM(case when s_score >60 and s_score <=70 then 1 else 0 end)/count(*)),2) as 百分比 from score GROUP BY c_id)d on a.c_id=d.c_id left join (select c_id,SUM(case when s_score >=0 and s_score <=60 then 1 else 0 end) as `0-60`, ROUND(100*(SUM(case when s_score >=0 and s_score <=60 then 1 else 0 end)/count(*)),2) as 百分比 from score GROUP BY c_id)e on a.c_id=e.c_id left join course f on a.c_id = f.c_id -- 24、查询学生平均成绩及其名次 select a.s_id, @i:=@i+1 as '不保留空缺排名', @k:=(case when @avg_score=a.avg_s then @k else @i end) as '保留空缺排名', @avg_score:=avg_s as '平均分' from (select s_id,ROUND(AVG(s_score),2) as avg_s from score GROUP BY s_id ORDER BY avg_s DESC)a,(select @avg_score:=0,@i:=0,@k:=0)b; -- 25、查询各科成绩前三名的记录 -- 1.选出b表比a表成绩大的所有组 -- 2.选出比当前id成绩大的 小于三个的 select a.s_id,a.c_id,a.s_score from score a left join score b on a.c_id = b.c_id and a.s_score<b.s_score group by a.s_id,a.c_id,a.s_score HAVING COUNT(b.s_id)<3 ORDER BY a.c_id,a.s_score DESC -- 26、查询每门课程被选修的学生数 select c_id,count(s_id) from score a GROUP BY c_id -- 27、查询出只有两门课程的全部学生的学号和姓名 select s_id,s_name from student where s_id in( select s_id from score GROUP BY s_id HAVING COUNT(c_id)=2); -- 28、查询男生、女生人数 select s_sex,COUNT(s_sex) as 人数 from student GROUP BY s_sex -- 29、查询名字中含有"风"字的学生信息 select * from student where s_name like '%风%'; -- 30、查询同名同性学生名单,并统计同名人数 select a.s_name,a.s_sex,count(*) from student a JOIN student b on a.s_id !=b.s_id and a.s_name = b.s_name and a.s_sex = b.s_sex GROUP BY a.s_name,a.s_sex -- 31、查询1990年出生的学生名单 select s_name from student where s_birth like '1990%' -- 32、查询每门课程的平均成绩,结果按平均成绩降序排列,平均成绩相同时,按课程编号升序排列 select c_id,ROUND(AVG(s_score),2) as avg_score from score GROUP BY c_id ORDER BY avg_score DESC,c_id ASC -- 33、查询平均成绩大于等于85的所有学生的学号、姓名和平均成绩 select a.s_id,b.s_name,ROUND(avg(a.s_score),2) as avg_score from score a left join student b on a.s_id=b.s_id GROUP BY s_id HAVING avg_score>=85 -- 34、查询课程名称为"数学",且分数低于60的学生姓名和分数 select a.s_name,b.s_score from score b join student a on a.s_id=b.s_id where b.c_id=( select c_id from course where c_name ='数学') and b.s_score<60 -- 35、查询所有学生的课程及分数情况; select a.s_id,a.s_name, SUM(case c.c_name when '语文' then b.s_score else 0 end) as '语文', SUM(case c.c_name when '数学' then b.s_score else 0 end) as '数学', SUM(case c.c_name when '英语' then b.s_score else 0 end) as '英语', SUM(b.s_score) as '总分' from student a left join score b on a.s_id = b.s_id left join course c on b.c_id = c.c_id GROUP BY a.s_id,a.s_name -- 36、查询任何一门课程成绩在70分以上的姓名、课程名称和分数; select a.s_name,b.c_name,c.s_score from course b left join score c on b.c_id = c.c_id left join student a on a.s_id=c.s_id where c.s_score>=70 -- 37、查询不及格的课程 select a.s_id,a.c_id,b.c_name,a.s_score from score a left join course b on a.c_id = b.c_id where a.s_score<60 --38、查询课程编号为01且课程成绩在80分以上的学生的学号和姓名; select a.s_id,b.s_name from score a LEFT JOIN student b on a.s_id = b.s_id where a.c_id = '01' and a.s_score>80 -- 39、求每门课程的学生人数 select count(*) from score GROUP BY c_id; -- 40、查询选修"张三"老师所授课程的学生中,成绩最高的学生信息及其成绩 -- 查询老师id select c_id from course c,teacher d where c.t_id=d.t_id and d.t_name='张三' -- 查询最高分(可能有相同分数) select MAX(s_score) from score where c_id='02' -- 查询信息 select a.*,b.s_score,b.c_id,c.c_name from student a LEFT JOIN score b on a.s_id = b.s_id LEFT JOIN course c on b.c_id=c.c_id where b.c_id =(select c_id from course c,teacher d where c.t_id=d.t_id and d.t_name='张三') and b.s_score in (select MAX(s_score) from score where c_id='02') -- 41、查询不同课程成绩相同的学生的学生编号、课程编号、学生成绩 select DISTINCT b.s_id,b.c_id,b.s_score from score a,score b where a.c_id != b.c_id and a.s_score = b.s_score -- 42、查询每门功成绩最好的前两名 -- 牛逼的写法 select a.s_id,a.c_id,a.s_score from score a where (select COUNT(1) from score b where b.c_id=a.c_id and b.s_score>=a.s_score)<=2 ORDER BY a.c_id -- 43、统计每门课程的学生选修人数(超过5人的课程才统计)。要求输出课程号和选修人数,查询结果按人数降序排列,若人数相同,按课程号升序排列 select c_id,count(*) as total from score GROUP BY c_id HAVING total>5 ORDER BY total,c_id ASC -- 44、检索至少选修两门课程的学生学号 select s_id,count(*) as sel from score GROUP BY s_id HAVING sel>=2 -- 45、查询选修了全部课程的学生信息 select * from student where s_id in( select s_id from score GROUP BY s_id HAVING count(*)=(select count(*) from course)) --46、查询各学生的年龄 -- 按照出生日期来算,当前月日 < 出生年月的月日则,年龄减一 select s_birth,(DATE_FORMAT(NOW(),'%Y')-DATE_FORMAT(s_birth,'%Y') - (case when DATE_FORMAT(NOW(),'%m%d')>DATE_FORMAT(s_birth,'%m%d') then 0 else 1 end)) as age from student; -- 47、查询本周过生日的学生 select * from student where WEEK(DATE_FORMAT(NOW(),'%Y%m%d'))=WEEK(s_birth) select * from student where YEARWEEK(s_birth)=YEARWEEK(DATE_FORMAT(NOW(),'%Y%m%d')) select WEEK(DATE_FORMAT(NOW(),'%Y%m%d')) -- 48、查询下周过生日的学生 select * from student where WEEK(DATE_FORMAT(NOW(),'%Y%m%d'))+1 =WEEK(s_birth) -- 49、查询本月过生日的学生 select * from student where MONTH(DATE_FORMAT(NOW(),'%Y%m%d')) =MONTH(s_birth) -- 50、查询下月过生日的学生 select * from student where MONTH(DATE_FORMAT(NOW(),'%Y%m%d'))+1 =MONTH(s_birth)
-
mybatis-plus配置控制台打印完整带参数SQL语句
2019-05-28 16:18:53问题背景 通常我们开发的时候,需要联合...因此我们需要输出完整的SQL语句以便调试。 解决方案 如果是application.yml #mybatis-plus配置控制台打印完整带参数SQL语句 mybatis-plus: configuration: log-impl: org...问题背景
通常我们开发的时候,需要联合控制台和Navicat/PLSQL等工具进行语句的拼接检查,如果只是输出了一堆
???
,那么将极大降低我们的效率。因此我们需要输出完整的SQL语句以便调试。Update
- 2020-Oct : 新增
LOG DEBUG LEVEL
模式 - 2020-July : 新增官方
p6spy打印分析sql语句方案
解决方案(StdOutImpl)
请注意: 部分朋友反馈不生效,估计跟引入的包有一定关系,druid+
mybatis-plus-boot-starter
就亲测有用。请检查是否有log4j相关实现类。如果是
application.yml
#by zhengkai.blog.csdn.net #mybatis-plus配置控制台打印完整带参数SQL语句 mybatis-plus: configuration: log-impl: org.apache.ibatis.logging.stdout.StdOutImpl
如果是application.properties,添加:
#mybatis-plus配置控制台打印完整带参数SQL语句 mybatis-plus.configuration.log-impl=org.apache.ibatis.logging.stdout.StdOutImpl
Mybatis内置的日志工厂提供日志功能,具体的日志实现有以下几种方式:
- SLF4J
- Apache Commons Logging
- Log4j 2
- Log4j
- JDK logging
- no logging
具体选择哪个日志实现由MyBatis的LogFactory
内置日志工厂
确定。它会使用最先找到的(按上文列举的顺序查找)。 如果一个都未找到,日志功能就会被禁用。static { tryImplementation(LogFactory::useSlf4jLogging); tryImplementation(LogFactory::useCommonsLogging); tryImplementation(LogFactory::useLog4J2Logging); tryImplementation(LogFactory::useLog4JLogging); tryImplementation(LogFactory::useJdkLogging); tryImplementation(LogFactory::useNoLogging); }
不少应用服务器的classpath中已经包含Commons Logging,如Tomcat和WebShpere, 所以MyBatis会把它作为具体的日志实现。
记住这点非常重要。这意味着,在诸如 WebSphere的环境中——WebSphere提供了Commons Logging的私有实现,你的Log4J配置将被忽略。
这种做法不免让人悲摧,MyBatis怎么能忽略你的配置呢?事实上,因Commons Logging已经存 在,按优先级Log4J自然就被忽略了!
控制台输出
--- [ XNIO-1 task-12] c.s.cms.controller.IndexController : username-admin-password-123456-**** Creating a new SqlSession SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@708e9ffd] was not registered for synchronization because synchronization is not active --- [ XNIO-1 task-12] com.alibaba.druid.pool.DruidDataSource : {dataSource-1} inited JDBC Connection [com.alibaba.druid.proxy.jdbc.ConnectionProxyImpl@62b13210] will not be managed by Spring ==> Preparing: select * from user t where t.user_code='admin' and t.password='123456' ==> Parameters: <== Columns: user_id, user_code, create_date, modify_date, user_name, password, status, role_id, department_id, major_id, classes_id, year <== Row: 1, admin, 2020-02-15 22:14:32, 2020-02-18 23:38:51, Moshow K ZHENG, 123456, 1, 9, 1, 13, 113, 2020 <== Total: 1 Closing non transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@708e9ffd]
解决方案(手写MybatisPlusOutImpl)
配置文件
mybatis-plus: configuration: # log-impl: org.apache.ibatis.logging.stdout.StdOutImpl # 改为自己写的 log-impl: com.softdev.system.config.MybatisPlusOutImpl
java类
MybatisPlusOutImpl
package com.softdev.system.config; import org.apache.ibatis.logging.Log; /** * @Description MybatisPlusOutImpl,直接使用控制台输出日志 * @Author zhengkai.blog.csdn.net **/ public class MybatisPlusOutImpl implements Log { public MybatisPlusOutImpl(String clazz) { System.out.println("MybatisPlusOutImpl::"+clazz); } public boolean isDebugEnabled() { return true; } public boolean isTraceEnabled() { return true; } public void error(String s, Throwable e) { System.err.println(s); e.printStackTrace(System.err); } public void error(String s) { System.err.println("MybatisPlusOutImpl::"+s); } public void debug(String s) { System.out.println("MybatisPlusOutImpl::"+s); } public void trace(String s) { System.out.println("MybatisPlusOutImpl::"+s); } public void warn(String s) { System.out.println("MybatisPlusOutImpl::"+s); } }
解决方案(LOG-DEBUG模式)
# 在application.yml 中增加配置,指定 mapper 文件所在的包,进入DEBUG模式 logging: level: com.baomidou.example.mapper: debug
官方解决方案p6spy(不建议)
查看p6spy最新版本 ,请注意,该方案为
侵入式
的JDBC级方案。pom.xml
引入<!-- https://mvnrepository.com/artifact/p6spy/p6spy --> <dependency> <groupId>p6spy</groupId> <artifactId>p6spy</artifactId> <version>3.9.1</version> </dependency>
这是
yaml
版本,还没试过,待我实验一下.spring: datasource: driver-class-name: com.p6spy.engine.spy.P6SpyDriver url: jdbc:p6spy:h2:mem:test ...
这是官方提供的
properties
版本#3.2.1以上使用 modulelist=com.baomidou.mybatisplus.extension.p6spy.MybatisPlusLogFactory,com.p6spy.engine.outage.P6OutageFactory #3.2.1以下使用或者不配置 #modulelist=com.p6spy.engine.logging.P6LogFactory,com.p6spy.engine.outage.P6OutageFactory # 自定义日志打印 logMessageFormat=com.baomidou.mybatisplus.extension.p6spy.P6SpyLogger #日志输出到控制台 appender=com.baomidou.mybatisplus.extension.p6spy.StdoutLogger # 使用日志系统记录 sql #appender=com.p6spy.engine.spy.appender.Slf4JLogger # 设置 p6spy driver 代理 deregisterdrivers=true # 取消JDBC URL前缀 useprefix=true # 配置记录 Log 例外,可去掉的结果集有error,info,batch,debug,statement,commit,rollback,result,resultset. excludecategories=info,debug,result,commit,resultset # 日期格式 dateformat=yyyy-MM-dd HH:mm:ss # 实际驱动可多个 #driverlist=org.h2.Driver # 是否开启慢SQL记录 outagedetection=true # 慢SQL记录标准 2 秒 outagedetectioninterval=2
- 2020-Oct : 新增
-
SpringBoot控制台打印SQL语句
2019-07-16 14:11:04在控制台上打印sql语句 mybatis: # spring boot集成mybatis的方式打印sql configuration: log-impl: org.apache.ibatis.logging.stdout.StdOutImpl 在log日志中打印 logging: level: ...在控制台上打印sql语句
mybatis: # spring boot集成mybatis的方式打印sql configuration: log-impl: org.apache.ibatis.logging.stdout.StdOutImpl
在log日志中打印
logging: level: com.eth.wallet.mapper: debug # com.eth.wallet.mapper 根据你的项目设定
-
Mybatis 开启控制台打印sql语句
2018-09-21 13:09:08springboot+mybatis整合过程中,开启控制台sql语句打印的两种方式: 方法一: 1.在mybatis的配置文件中添加: <settings> <!-- 打印sql日志 --> <setting name="...springboot+mybatis整合过程中,开启控制台sql语句打印的多种方式:
方法一:
1.在mybatis的配置文件中添加:
<settings> <!-- 打印sql日志 --> <setting name="logImpl" value="STDOUT_LOGGING" /> </settings>
mybatis的配置文件----mybatis-config.xml如下:
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd"> <configuration> <settings> <!-- 打印sql日志 --> <setting name="logImpl" value="STDOUT_LOGGING" /> </settings> </configuration>
2.在springboot的配置文件----appcation.yml中添加:
mybatis: configuration: log-impl: org.apache.ibatis.logging.stdout.StdOutImpl
ps:
IDEA中,springboot默认配置文件是application.properties文件,但是yml文件在语法上更加简洁,更有层次感,所以此处是用yml语法,properties中好像是这么写的:mybatis.configuration.log-impl= org.apache.ibatis.logging.stdout.StdOutImpl
控制台可以打印了。。。。。
方法二:
在springboot+mybatis整合中,可以将springboot的配置文件添加如下一段也可:
logging: level: com.lucifer.springboot.cache.mapper: debug
ps: com.lucifer.springboot.cache.mapper是包名
方法三:
如果你使用的是springboot+mybatis-plus的话:
<dependency> <groupId>com.baomidou</groupId> <artifactId>mybatis-plus-boot-starter</artifactId> <version>3.3.1</version> </dependency>
application.yml:
mybatis-plus: configuration: log-impl: org.apache.ibatis.logging.stdout.StdOutImpl
控制台打印:
JDBC Connection [HikariProxyConnection@1006460161 wrapping com.mysql.cj.jdbc.ConnectionImpl@37cccae8] will not be managed by Spring ==> Preparing: SELECT id,user_name,age FROM user WHERE (user_name = ?) ==> Parameters: 张三(String) <== Columns: id, user_name, age <== Row: 1, 张三, 18 <== Total: 1
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