#!/bin/sh#define the strcture of tableTABLE=quot;(username char(50) not null,password char(20) not null,uid char(10) no
#!/bin/sh
#define the strcture of table
TABLE="(username char(50) not null,password char(20) not null,uid char(10) not null,gid char(10) not null,maildir char(100) not null,domain char(20) not null,active char(1) default '1');"
#create database and table
#+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
for type in database table;do
printf "Please input the $type name you would like to create:[postfix]"
while read data;do
if [ ! -z ${data} ]; then
if [ "$type" = "database" ];then
database=$data
elif [ "$type" = "table" ];then
table=$data
fi
break
fi
printf "Please input the database name you would like to create:[postfix]"
done
done
#++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
#input the data per user
#++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
for ((i=1;;i++));do
printf "Do you want to input the data per user:[yes,no]"
while read yes_no;do
if [ "$yes_no" != "yes" ];then break 2;fi
echo "Please input the data of NO.$i user:"
for col in username password uid gid maildir domain active;do
printf "$col of NO.$i :" && read ${col}[${i}]
done
break
done
done
#output the data you input
#+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
echo ""
echo "++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++"
echo "Please make sure the data you input:"
echo "Database: $database"
echo "Table : $table"
echo ""
echo "Show the recodes you input:"
echo "username password uid gid maildir domain active"
for ((n=1;n echo "${username[$n]} ${password[$n]} ${uid[$n]} ${gid[$n]} ${maildir[$n]} ${domain[$n]} ${active[$n]}"
done
#++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
#execute the sql to input data to mysql
#++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
echo ""
echo "Executing the SQL to input data to mysql......"
printf "Creating database $database...... " && \
mysql -u root -h --password=RedHat -e "create database if not exists ${database}" && \
echo -e "\033[32mOK\033[m"
printf "Creating table $table...... " && \
mysql -u root -h --password=redhat $database -e "create table if not exists ${table}$TABLE" && \
echo -e "\033[32mOK\033[m"
#insert recode to mysql
for ((n=1;n printf "Insert NO.$n recode...... " && \
mysql -u root -h --password=redhat $database -e "insert into $table values ('${username[$n]}',encrypt('${password[$n]}'),'${uid[$n]}','${gid[$n]}','${maildir[$n]}','${domain[$n]}','${active[$n]}')" && \
echo -e "\033[32mOK\033[m"
done
#show all the recode
echo ""
echo "Show all the recods in the mysql:"
mysql -u root -h --password=redhat $database -e "select * from $table"

如何有效监控MySQL性能?使用mysqladmin、SHOWGLOBALSTATUS、PerconaMonitoringandManagement(PMM)和MySQLEnterpriseMonitor等工具。1.使用mysqladmin查看连接数。2.用SHOWGLOBALSTATUS查看查询数。3.PMM提供详细性能数据和图形化界面。4.MySQLEnterpriseMonitor提供丰富的监控功能和报警机制。

MySQL和SQLServer的区别在于:1)MySQL是开源的,适用于Web和嵌入式系统,2)SQLServer是微软的商业产品,适用于企业级应用。两者在存储引擎、性能优化和应用场景上有显着差异,选择时需考虑项目规模和未来扩展性。

在需要高可用性、高级安全性和良好集成性的企业级应用场景下,应选择SQLServer而不是MySQL。1)SQLServer提供企业级功能,如高可用性和高级安全性。2)它与微软生态系统如VisualStudio和PowerBI紧密集成。3)SQLServer在性能优化方面表现出色,支持内存优化表和列存储索引。

mySqlManagesCharacterSetsetSandCollationsyutusututf-8asthEdeFault,允许ConfigurationAtdataBase,table和columnlevels,AndrequiringCarefullageLignmentToavoidMismatches.1)setDefeaultCharactersetTercharactersetEtCollacterSeteTandColletationForAdataBase.2)conformentcollecharactersettersetertersetcollatertersetcollationcollation

MySQL触发器是与表相关联的自动执行的存储过程,用于在特定数据操作时执行一系列操作。1)触发器定义与作用:用于数据校验、日志记录等。2)工作原理:分为BEFORE和AFTER,支持行级触发。3)使用示例:可用于记录薪资变更或更新库存。4)调试技巧:使用SHOWTRIGGERS和SHOWCREATETRIGGER命令。5)性能优化:避免复杂操作,使用索引,管理事务。

在MySQL中创建和管理用户账户的步骤如下:1.创建用户:使用CREATEUSER'newuser'@'localhost'IDENTIFIEDBY'password';2.分配权限:使用GRANTSELECT,INSERT,UPDATEONmydatabase.TO'newuser'@'localhost';3.修正权限错误:使用REVOKEALLPRIVILEGESONmydatabase.FROM'newuser'@'localhost';然后重新分配权限;4.优化权限:使用SHOWGRA

MySQL适合快速开发和中小型应用,Oracle适合大型企业和高可用性需求。1)MySQL开源、易用,适用于Web应用和中小型企业。2)Oracle功能强大,适合大型企业和政府机构。3)MySQL支持多种存储引擎,Oracle提供丰富的企业级功能。

MySQL相比其他关系型数据库的劣势包括:1.性能问题:在处理大规模数据时可能遇到瓶颈,PostgreSQL在复杂查询和大数据处理上表现更优。2.扩展性:水平扩展能力不如GoogleSpanner和AmazonAurora。3.功能限制:在高级功能上不如PostgreSQL和Oracle,某些功能需要更多自定义代码和维护。


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