批量获取mysql数据库实例指定参数的值

#!/bin/bash
#
#call method:sh script_name @@mysql系统参数1,@@mysql系统参数2...[以逗号分隔每个参数]
#

#所有数据库实例通用的账号/密码，比如root/root
user=root
password=root

#存储元数据的数据库信息
host=5.5.5.101
port=3306
db=test


mysql -u${user} -p${password} -h${host} ${db} 2>/dev/null -Ns > all.txt<<EOF
 select 
       c.group_name,
       b.cluster_name,
       a.db_ip,
       a.db_port,    
       if(a.is_master = 0, ‘主‘, ‘备‘)
  from db_node a,db_cluster b,db_cluster_group c
  where a.cluster_id=b.id
  and b.group_id=c.id
  and a.status<>‘deleted‘
 order by b.cluster_name;
EOF

 
params=$@
 
cat all |while read line
do
    db_cluster_group=`echo $line | awk ‘{print $1}‘`
    db_cluster_name=`echo $line | awk ‘{print $2}‘`
    db_ip=`echo $line | awk ‘{print $3}‘`
    db_port=`echo $line | awk ‘{print $4}‘`
    db_role=`echo $line | awk ‘{print $5}‘`
    mysql -u${user} -p${password} -h$db_ip -P$db_port 2>/dev/null -Nse "select ‘$db_cluster_group‘,‘$db_cluster_name‘,‘$db_ip‘,‘$db_port‘,‘$db_role‘,$params;"
done