add tagNameFunc to handle complicated tagName
add tagNameFunc to handle complicated tagName

cortex/sqlx,jmoiron/sqlx,aiyi/sqlx,adcaes/sqlx,outrightmental/go-sqlx,StabbyCutyou/sqlx,proteneer/sqlx,beni55/sqlx,wmydz1/sqlx,snikch/sqlx,johnsto/sqlx,larsth/sqlx