昨天写的shell脚本批量插入数据( mysql批量插入数据(更改版)和 mysql批量插入数据都是本人写的)在执行的过程中太慢,3000多条数据插入了2个多小时,这次用储存过程批量插入数据,一万条数据仅仅用了7分钟,主要是因为,shell脚本插入式每次都得打开数据库
昨天写的shell脚本批量插入数据( mysql批量插入数据(更改版)和 mysql批量插入数据都是本人写的)在执行的过程中太慢,3000多条数据插入了2个多小时,这次用储存过程批量插入数据,一万条数据仅仅用了7分钟,主要是因为,shell脚本插入式每次都得打开数据库,而用储存过程只需要打开一次数据库就行啦!#数据表的结构为stu_id(学号) ,stu_name(姓名),stu_sex(性别),cla_id(班级编号),stu_phone(手机号) drop procedure if exists insertt;#如果存在储存过程则删除 delimiter $$ #创建一个储存过程 create procedure insertt() begin set @a=2000000001; #学号 set @d=20000001; #班级编号 set @e=18200000000; #手机号 while @a<2000010001 do #如果@a<2000010001则返回true,继续执行 set @b=rand_string(5); #姓名,随即赋值,值为5位a-zA-Z的任意组合 set @c=rand_sex(1); #性别,随即赋值,值为1位,0或者1 insert into students values(@a,@b,@c,@d,@e); set @a=@a+1; set @e=@e+1; if @a%100=0 then set @d=@d+1 ; end if; end while; end$$ delimiter ; #执行存储过程插入数据 call insertt(); #创建一个随机产生字符串的函数 set global log_bin_trust_function_creators = 1; DROP FUNCTION IF EXISTS rand_string; DELIMITER // CREATE FUNCTION rand_string(n INT) RETURNS VARCHAR(255) BEGIN DECLARE chars_str varchar(100) DEFAULT 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'; DECLARE return_str varchar(255) DEFAULT ''; DECLARE i INT DEFAULT 0; WHILE i < n DO SET return_str = concat(return_str,substring(chars_str , FLOOR(1 + RAND()*52 ),1));#52代表在52个字母中随即找出一个 SET i = i +1; END WHILE; RETURN return_str; END // delimiter ; #创建一个随机产生字符串的函数,0和1随机出现 set global log_bin_trust_function_creators = 1; DROP FUNCTION IF EXISTS rand_sex; DELIMITER // CREATE FUNCTION rand_sex(n INT) RETURNS VARCHAR(255) BEGIN DECLARE chars_str varchar(100) DEFAULT '01'; DECLARE return_str varchar(255) DEFAULT ''; DECLARE i INT DEFAULT 0; WHILE i < n DO SET return_str = concat(return_str,substring(chars_str , FLOOR(1 + RAND()*2 ),1)); SET i = i +1; END WHILE; RETURN return_str; END // delimiter ;

MySQLviewshavelimitations:1)Theydon'tsupportallSQLoperations,restrictingdatamanipulationthroughviewswithjoinsorsubqueries.2)Theycanimpactperformance,especiallywithcomplexqueriesorlargedatasets.3)Viewsdon'tstoredata,potentiallyleadingtooutdatedinforma

ProperusermanagementinMySQLiscrucialforenhancingsecurityandensuringefficientdatabaseoperation.1)UseCREATEUSERtoaddusers,specifyingconnectionsourcewith@'localhost'or@'%'.2)GrantspecificprivilegeswithGRANT,usingleastprivilegeprincipletominimizerisks.3)

MySQLdoesn'timposeahardlimitontriggers,butpracticalfactorsdeterminetheireffectiveuse:1)Serverconfigurationimpactstriggermanagement;2)Complextriggersincreasesystemload;3)Largertablesslowtriggerperformance;4)Highconcurrencycancausetriggercontention;5)M

Yes,it'ssafetostoreBLOBdatainMySQL,butconsiderthesefactors:1)StorageSpace:BLOBscanconsumesignificantspace,potentiallyincreasingcostsandslowingperformance.2)Performance:LargerrowsizesduetoBLOBsmayslowdownqueries.3)BackupandRecovery:Theseprocessescanbe

Adding MySQL users through the PHP web interface can use MySQLi extensions. The steps are as follows: 1. Connect to the MySQL database and use the MySQLi extension. 2. Create a user, use the CREATEUSER statement, and use the PASSWORD() function to encrypt the password. 3. Prevent SQL injection and use the mysqli_real_escape_string() function to process user input. 4. Assign permissions to new users and use the GRANT statement.

MySQL'sBLOBissuitableforstoringbinarydatawithinarelationaldatabase,whileNoSQLoptionslikeMongoDB,Redis,andCassandraofferflexible,scalablesolutionsforunstructureddata.BLOBissimplerbutcanslowdownperformancewithlargedata;NoSQLprovidesbetterscalabilityand

ToaddauserinMySQL,use:CREATEUSER'username'@'host'IDENTIFIEDBY'password';Here'showtodoitsecurely:1)Choosethehostcarefullytocontrolaccess.2)SetresourcelimitswithoptionslikeMAX_QUERIES_PER_HOUR.3)Usestrong,uniquepasswords.4)EnforceSSL/TLSconnectionswith

ToavoidcommonmistakeswithstringdatatypesinMySQL,understandstringtypenuances,choosetherighttype,andmanageencodingandcollationsettingseffectively.1)UseCHARforfixed-lengthstrings,VARCHARforvariable-length,andTEXT/BLOBforlargerdata.2)Setcorrectcharacters


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