使用rf做数据库的增删改查操作可以定义关键字，方便后续使用

关键字如下：

一、sql_查

1     [Arguments]    ${host}    ${port}    ${user}    ${passwd}    ${db}    ${sql}
2     Connect To Database Using Custom Params    pymysql    host='${host}', port=${port}, user='${user}', passwd='${passwd}', db='${db}',charset='utf8'
3     ${return}    Query    ${sql}
4     Disconnect From Database
5     [Return]    ${return}

二、sql_增删改查

[Arguments]    ${host}    ${port}    ${user}    ${passwd}    ${db}    ${sql}
    Connect To Database Using Custom Params    pymysql    host='${host}', port=${port}, user='${user}', passwd='${passwd}', db='${db}',charset='utf8'    #host='${host}', port=${port}, user='${user}', passwd='${passwd}', db='${db}',charset='utf8'
    ${return}    Execute Sql String    ${sql}
    Disconnect From Database

三、使用