Spring - Spring中的設計模式例子

阿新 • • 發佈：2022-03-07

mysql 8.0.20 安裝配置詳細教程

1. 下載解壓安裝包
2. 配置檔案my.ini，建立 Data目錄，都和bin同級
[mysqld]
#設定3306埠
port=3306
#設定mysql的安裝目錄
basedir=D:\env\mysql-8.0.26-winx64
#設定mysql資料庫的資料的存放目錄
datadir=D:\env\mysql-8.0.26-winx64\Data
#允許最大連線數
max_connections=200
#允許連線失敗的次數。
max_connect_errors=10
#服務端使用的字符集預設為utf8mb4
character-set-server=utf8mb4
#建立新表時將使用的預設儲存引擎
default-storage-engine=INNODB
#預設使用“mysql_native_password”外掛認證
#mysql_native_password
default_authentication_plugin=mysql_native_password
[mysql]
#設定mysql客戶端預設字符集
default-character-set=utf8mb4
[client]
#設定mysql客戶端連線服務端時預設使用的埠
port=3306
default-character-set=utf8mb4

3. 配置環境變數
4. mysqld install // 安裝服務  解除安裝為 mysqld -remove mysql
5. mysqld --initialize --console 初始化， 初始化完成後會有初始密碼列印在控制檯，注意檢視 root@localhost 後的密碼
6. net start mysql // 如果這裡提示找不到mysql服務，就看看是不是4步驟沒做
7. mysql -u root -p // 接下來會輸入密碼，就是步驟5中給的
8. ALTER USER root@localhost IDENTIFIED BY ‘123456'; // 修改預設密碼

解決 “Too many connections”問題

show variables like '%max_connections%'  # 檢視最大連線數

show full processlist;  # 檢視所有連結

#1. **清理mysql的sleep連結

# shell
#It is used to kill processlist of mysql sleep

#!/bin/sh
MYSQLDIR=/usr/bin
MYSQLTOOL=$MYSQLDIR/mysql
MYSQLUSER=server
MYSQLPASS="Server@123456"
usage()
{
    echo "Usage: $0 ip port user db"
    echo "Example: $0 1.1.1.1 3306 server dx-shop"
    exit
}

if [ $# -ne 4 ];then
    usage
fi
hostip=$1
port=$2
user=$3
db=$4
sleepid="SELECT ID FROM information_schema.PROCESSLIST t WHERE t.COMMAND='Sleep' and user='$3' and DB='$4' and time >1000;"
echo $sleepid
 $MYSQLTOOL -h$hostip -u$MYSQLUSER -p$MYSQLPASS -P$port -e "$sleepid" >sleepIDs

while read sID
do
 echo $sID
$MYSQLTOOL -h$hostip -u$MYSQLUSER -p$MYSQLPASS -P$port -e "kill $sID"
done<sleepIDs

# 檢視事務佔用
select * from information_schema.innodb_trx

# 2. 修改最大連線數
# 2.1
set global max_connections=14000; # 臨時修改，資料庫重啟就會變為原來的
# 2.2 在my.conf 引數中修改，不過需要重新啟動mysql 服務！不推薦**

刪除多個欄位唯一的重複行

# 記得備份!!!
# 記得備份!!!
# 記得備份!!!
DELETE
FROM
	vivo_theme_detail_info_pipeline
WHERE
	(package_id,
	theme_type,
	phone_model,
	oneday) IN (
		SELECT
			t.package_id,
			t.theme_type,
			t.phone_model,
			t.oneday
		FROM
			(
				SELECT
					package_id,
					theme_type,
					phone_model,
					oneday
				FROM
					vivo_theme_detail_info_pipeline
				GROUP BY
					package_id,
					theme_type,
					phone_model,
					oneday
				HAVING
					count(1) > 1
			) t
	)
AND id NOT IN (
	SELECT
		dt.minid
	FROM
		(
			SELECT
				min(id) AS minid
			FROM
				vivo_theme_detail_info_pipeline
			GROUP BY
				package_id,
				theme_type,
				phone_model,
				oneday
			HAVING
				count(1) > 1
		) dt
)

DELETE 
FROM
	vivo_theme_detail_info_pipeline
WHERE
	(
		package_id
	) IN (
		SELECT
			t.package_id
		FROM
			(
				SELECT
					package_id
				FROM
					vivo_theme_detail_info_pipeline
				GROUP BY
					package_id
				HAVING
					count(1) > 1
			) t
	)
AND id NOT IN (
	SELECT
		dt.minid
	FROM
		(
			SELECT
				min(id) AS minid
			FROM
				vivo_theme_detail_info_pipeline
			GROUP BY
				package_id
			HAVING
				count(1) > 1
		) dt
)

中文按首字母排序

SELECT
	        author
        FROM
	        vivo_theme_detail_info_pipeline
        GROUP BY
	        author
        ORDER BY
	        CONVERT(author USING gbk)

Mybatis collection （一對多）1分頁

// mybatis 使用collection標籤實現一對多查詢(多分頁使用)
https://blog.csdn.net/wszcy199503/article/details/77867990

# code:
<resultMap id="authorDayMap"

               type="com.colorfulworld.dataanalysis.domain.vivotheme.VivoThemeAuthorDays">
        <id property="name" column="name" />
        <result property="author" column="author"/>
        <result property="modifyTime" column="modify_time" />
        <result property="thumbPath" column="thumb_path" />
        <result property="urlRoot" column="url_root" />
        <result property="start" column="start"></result>
        <result property="end" column="end"></result>
        <collection property="details" column="{author=author, start=start, end=end, name=name}" ofType="authorDayMapKid" javaType="ArrayList" select="getAuthorDayMapKid">
<!--            <result property="oneday" column="oneday"></result>-->
<!--            <result property="downloads" column="downloads"></result>-->
        </collection>
    </resultMap>

    <resultMap id="authorDayMapKid"  type="com.colorfulworld.dataanalysis.domain.vivotheme.DadDownload">
        <result property="oneday" column="oneday"></result>
        <result property="downloads" column="downloads"></result>
    </resultMap>

<select id="getAuthorDayMap"
            resultMap="authorDayMap">
        SELECT
        author,
        package_id,
        theme_type,
        `name`,
        oneday,
        thumb_path,
        url_root,
        (FROM_UNIXTIME(	modify_time / 1000,	'%Y-%m-%d %h:%i:%s'	)
        ) AS modify_time,
        #{start} as start,
        #{end} as `end`
        FROM
        vivo_theme_detail_info_pipeline
        where DATE_FORMAT((FROM_UNIXTIME(modify_time / 1000,'%Y-%m-%d %h:%i:%s')),'%Y-%m-%d') between #{start} and #{end}
        <if test="author != null and author != ''">
            and author = #{author}
        </if>
        GROUP BY
        author,
        `name`
        ORDER BY
        modify_time DESC
    </select>

    <select id="getAuthorDayMapKid"
            resultMap="authorDayMapKid">
        SELECT
        oneday,
        max(downloads) as downloads
        FROM
        vivo_theme_detail_info_pipeline
        where author = #{author} and name=#{name} and oneday between #{start} and #{end}
        GROUP BY
        author,
        `name`,
        oneday
        ORDER BY
        modify_time DESC,  oneday
    </select>

List<VivoThemeAuthorDays> getAuthorDayMap(@Param("author")String author, @Param("start")String start, @Param("end")String end);

多欄位鍵插入或更新

<insert id="saveOrUpdateDuplicate" parameterType="com.cht.modules.t.entity.IncomeEntity">
		insert into
		<include refid="BASE_TABLE"/>
		<trim prefix="(" suffix=")" suffixOverrides=",">
			excel_id, `date`, `name`, exposure_count, click_count, download_count, order_count, money, filename, update_time
		</trim>
		<trim prefix="values(" suffix=")" suffixOverrides=",">
			#{income.excelId}, #{income.date}, #{income.name}, #{income.exposureCount}, #{income.clickCount}, #{income.downloadCount},
			#{income.orderCount}, #{income.money}, #{income.filename}, now()
		</trim>
		on **duplicate key** update excel_id=values(excel_id), `date`=values(`date`), exposure_count=values(exposure_count),
		click_count=values(click_count), download_count=values(download_count), order_count=values(order_count), money=values(money), update_time=values(update_time)
	</insert>

SQL優化`Explain`

// title: sql優化的30個建議  https://www.cnblogs.com/xc-chejj/p/11244748.html
explain select ... 可以檢視sql具體執行了多少行，用沒用到索引
// title: explain 詳解 https://www.cnblogs.com/qlqwjy/p/7767479.html
// title: 知乎優化建議 https://zhuanlan.zhihu.com/p/130820841

// explain詳解
https://blog.csdn.net/youanyyou/article/details/109664306
// mysql 執行順序
https://www.cnblogs.com/loong-hon/p/13470263.html

獲取分組後的第一個資料

substring_index(substring_index(GROUP_CONCAT(tt.url_root),',',3),',',-1) AS url_root

Mysql的一個莫名其妙的問題(版本問題)

問題描述：
專案：彩虹糖財務報表管理系統
問題：一個2w row的表需要自連線，程式碼如下：
SELECT
	t1.*, ROUND(
		(
			t1.money - IFNULL(t2.money, 0)
		) * 0.665,
		2
	) AS reduce_money,
	Round(
		(
			t1.money - IFNULL(t2.money, 0)
		),
		2
	) AS reward
FROM
	(
		SELECT
			c.`name` designerName,
			a.filename,
			a.artwork_id,
			a.income_record_id,
			b.`name`,
			a.money money
		FROM
			t_income a
		RIGHT JOIN t_artwork b ON a.artwork_id = b.id
		RIGHT JOIN t_designer c ON b.designer_id = c.id
		AND c.need_statistics = 0
		WHERE
			a.filename = '2021-08'
		AND b.firm = 'vivo'
	) t1
LEFT JOIN (
	SELECT
		c.`name` designerName,
		a.filename,
		a.artwork_id,
		a.income_record_id,
		b.`name`,
		a.money money
	FROM
		t_income a
	RIGHT JOIN t_artwork b ON a.artwork_id = b.id
	RIGHT JOIN t_designer c ON b.designer_id = c.id
	AND c.need_statistics = 0
	WHERE
		a.filename = '2021-07'
	AND b.firm = 'vivo'
) t2 ON t1.artwork_id = t2.artwork_id

本地mysql和遠端mysql的效率完全不同，本地需要40s+，遠端0.02s
問題探究：
使用explain 檢視兩個表執行計劃
本地：
1	SIMPLE	c		ALL	PRIMARY				29	10	Using where
1	SIMPLE	b		ref	PRIMARY,uni	uni	5	profit_report.c.id	14	10	Using index condition
1	SIMPLE	a		ref	uni_	uni_	5	profit_report.b.id	252	10	Using where
1	SIMPLE	c		ALL					29	100	
1	SIMPLE	b		ref	uni	uni	5	profit_report.c.id	14	100	Using where
1	SIMPLE	a		ref	uni_	uni_	5	profit_report.b.id	252	100	Using where

遠端：
1	SIMPLE	c		ALL	PRIMARY				29	10	Using where
1	SIMPLE	b		ref	PRIMARY,uni	uni	5	profit_report.c.id	14	10	Using index condition
1	SIMPLE	a		ref	uni_	uni_	5	profit_report.b.id	252	10	Using where
1	SIMPLE	b		eq_ref	PRIMARY,uni	PRIMARY	4	profit_report.b.id	1	100	Using where
1	SIMPLE	c		eq_ref	PRIMARY	PRIMARY	4	profit_report.b.designer_id	1	100	Using where
1	SIMPLE	a		ref	uni_	uni_	5	profit_report.b.id	252	100	Using where

可以看出是在4、5行出現了偏差，但是不知道問題出在哪裡，於是猜測是配置檔案的問題，結果好像也不是，因為也看不太懂

然後檢視mysql版本後發現，本地mysql版本為 8.0.12， 遠端的mysql版本為 8.0.20， 最後自己做了一個對照實驗，發現的確
是版本問題。

問題仍未解決。

Group_concat函式返回最大長度

show variables like 'group_concat_max_len';
// 預設是1024，如果拼接字太長就會導致顯示不全

// 生產環境修改值
// 1. 臨時修改值
SET GLOBAL group_concat_max_len = 4294967295;
SET SESSION group_concat_max_len = 4294967295;
// 2. 寫入my.ini/my.cnf
// windows是my.int, linux 是 my.cnf
在[mysqld]下新增配置：group_concat_max_len=4294967295

注意是：在[mysqld]下新增；在[mysqld]下新增；在[mysqld]下新增；重要的事情說三遍。

然後重啟mysql服務，然後通過上面的查詢sql進行檢視是否生效。

// tips: linux 檢視my.cnf位置,一般會查到多個，用cat看下，只有一個能用
mysqld --verbose --help|grep -A 1 'Default options'
// or
[arlin@MiWiFi-R1CM-srv ~]$ which mysqld
/usr/sbin/mysqld
[arlin@MiWiFi-R1CM-srv ~]$ /usr/sbin/mysqld --verbose --help | grep -A 1 'Default options'
2017-10-12T11:09:22.209992Z 0 [Warning] Changed limits: max_open_files: 1024 (requested 5000)
2017-10-12T11:09:22.210068Z 0 [Warning] Changed limits: table_open_cache: 431 (requested 2000)
Default options are read from the following files in the given order:
/etc/my.cnf /etc/mysql/my.cnf /usr/etc/my.cnf ~/.my.cnf 
[arlin@MiWiFi-R1CM-srv ~]$

Mysql 日期取年月日

date_format(date ,'%Y-%m-%d' )

Mysql插入時判斷記錄是否存在

insert into tunnel_alarm
        <trim prefix="(" suffix=")" suffixOverrides=",">
            <if test="targetId != null">target_id,</if>
            <if test="alarmType != null">alarm_type,</if>
            <if test="targetType != null">target_type,</if>
            <if test="alarmTime != null">alarm_time,</if>
            <if test="lastAlarmTime != null">last_alarm_time,</if>
            <if test="alarmPosition != null">alarm_position,</if>
            <if test="createTime != null">create_time,</if>
            <if test="updateTime != null">update_time,</if>
            <if test="updateTime != null">read_state,</if>
         </trim>
        <trim prefix="select " suffix="" suffixOverrides=",">
            <if test="targetId != null">#{targetId},</if>
            <if test="alarmType != null">#{alarmType},</if>
            <if test="targetType != null">#{targetType},</if>
            <if test="alarmTime != null">#{alarmTime},</if>
            <if test="lastAlarmTime != null">#{lastAlarmTime},</if>
            <if test="alarmPosition != null">#{alarmPosition},</if>
            <if test="createTime != null">#{createTime},</if>
            <if test="updateTime != null">#{updateTime},</if>
            <if test="updateTime != null">#{readState},</if>
         </trim>
        from dual
        where not exists (select alarm_id from tunnel_alarm
        <where>
            <if test="targetId != null "> and target_id = #{targetId}</if>
            <if test="alarmType != null "> and alarm_type = #{alarmType}</if>
            <if test="targetType != null "> and target_type = #{targetType}</if>
            and read_state = 0
        </where>
        )

Mybatis插入時返回主鍵

<insert id="insertDept" **keyProperty="deptId"** parameterType="Dept">
        insert into tunnel_dept
        <trim prefix="(" suffix=")" suffixOverrides=",">
            <if test="deptId != null">dept_id,</if>
            <if test="deptName != null and deptName != ''">dept_name,</if>
            <if test="createTime != null">create_time,</if>
            <if test="delFlag != null">del_flag,</if>
         </trim>
        <trim prefix="values (" suffix=")" suffixOverrides=",">
            <if test="deptId != null">#{deptId},</if>
            <if test="deptName != null and deptName != ''">#{deptName},</if>
            <if test="createTime != null">#{createTime},</if>
            <if test="delFlag != null">#{delFlag},</if>
         </trim>
    </insert>

MYSQL 批量修改自增

set @row=0;
update tb_s 
set a = (
	select @row := @row + 1 as nid
)
where 1 = 1

誤刪資料恢復

// 參考： 通過二進位制日誌恢復誤刪資料庫 http://t.zoukankan.com/plutozzl-p-13530442.html
// mysqlbinlog 工具分析binlog日誌 https://www.cnblogs.com/lvzf/p/10689462.html
// mysql誤刪資料快速恢復 https://www.cnblogs.com/-mrl/p/9959365.html

mysqlbinlog --no-defaults --database=profit_report **--base64-output=decode-rows -v** --start-datetime="2021-12-01 17:08:05" --stop-datetime="2021-12-03 00:00:00" ./binlog.000041 > pr-rollback.txt

Java PoJo轉sql表

Code

GenerateSqlFromEntityUtil.java

回滾

MyIsam 不能回滾，
Innodb可以回滾

Mysql按指定順序排序的兩種寫法

SELECT `ID` FROM wp_posts WHERE `ID` in (1,2,3,4,5) ORDER BY FIELD(`ID`,5,4,3,1,2); // 純數字欄位不用處理引號，比較好拼接
SELECT `ID` FROM wp_posts WHERE `ID` in (1,2,3,4,5) ORDER BY FIND_IN_SET(`post_title`,'A,B,C,D,E'); // 一個引號全包住，搞定字元值欄位

-- 注意：第一個引數不能是字串，否則不起作用
-- 效能差異：

# 方法1
SELECT
	*, a.material_num
FROM
	wp_silkscreen_task_config a
ORDER BY
	material_num IN (
		(
			SELECT
				material_num
			FROM
				wp_silkscreen_task_config
			WHERE
				state <> 2
			GROUP BY
				material_num
			HAVING
				min(state) > 0
		)
	)

# 方法2
SELECT
	*, a.material_num
FROM
	wp_silkscreen_task_config a
ORDER BY
	FIND_IN_SET(
		`material_num`,
		(
			SELECT
				material_num
			FROM
				wp_silkscreen_task_config
			WHERE
				state <> 2
			GROUP BY
				material_num
			HAVING
				min(state) > 0
		)
	)

mysql8.0版本 the user specified as a definer ('root'@'%') does not exist問題解決

mysql> create user 'root'@'%' identified by '密碼';
Query OK, 0 rows affected (2.35 sec)

mysql> grant all privileges on *.* to 'root'@'%';
Query OK, 0 rows affected (0.06 sec)

mysql> flush privileges;
Query OK, 0 rows affected (0.06 sec)

mysql8.0 zip安裝

1. mysqld --initialize --console # 前提要有my.ini, 初始密碼會列印到控制檯
2. mysqld install
3. mysql -u root -p # 輸入剛剛的初始密碼
4. alter user 'root'@'localhost' identified by 'newpassword';  #修改密碼