扣丁学堂Linux培训之shell脚本操作mysql数据库删除重

　　今天扣丁学堂Linux培训老师给大家介绍一下关于shell脚本操作mysql数据库删除重复数据的详细介绍，首先由于之前的业务，造成数据库上产生了脏数据，写个脚本删除重复的数据。由于是开发测试环境，所以选择任意删除相同uid中的一条。由于每次执行只删除重复数据的一条，需要重复执行，如果本轮没有数据被删就OK。

Linux培训

#!/bin/sh

# delete all company's duplicate uid

MYSQL_BIN_PATH=/data/mysql/server/mysql_3306/bin

MYSQL_SOCK_PATH=/data/mysql/server/mysql_3306/tmp

DBUSER=dbuser

DBPWD=userpwd

DBHOSTNAME=192.168.1.105

PORT=3306

# get all company_id

for company_id in `${MYSQL_BIN_PATH}/mysql -u${DBUSER} -p${DBPWD} -h ${DBHOSTNAME} -P ${PORT} --socket=${MYSQL_SOCK_PATH}/mysql.sock -e "

  SELECT company_id FROM company.companypage;"`

do

if [ $company_id != "company_id" ] ; then

# if [ $company_id -eq 2733 ] ; then

suffix=`expr ${company_id} % 100`

for user_id in `${MYSQL_BIN_PATH}/mysql -u${DBUSER} -p${DBPWD} -h ${DBHOSTNAME} -P ${PORT} --socket=${MYSQL_SOCK_PATH}/mysql.sock -e "

SELECT user_id FROM company.company_candidate_${suffix} WHERE company_id=${company_id} AND user_id>0 GROUP BY company_id, user_id HAVING COUNT(user_id) > 1;"`

do

if [ $user_id != "user_id" ] ; then

  ${MYSQL_BIN_PATH}/mysql -u${DBUSER} -p${DBPWD} -h ${DBHOSTNAME} -P ${PORT} --socket=${MYSQL_SOCK_PATH}/mysql.sock -e "

  DELETE FROM company.company_candidate_${suffix} WHERE company_id=${company_id} and user_id=${user_id} limit 1;"

  echo "delete from company_candidate_${suffix} where company_id=${company_id} and user_id=${user_id} limit 1"

fi

done

# fi

fi

done

exit 0

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