mysql - doctrine one table is referenced by multiple tables, how can i get the reference record without switch -

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imaging have 3 tables, person, boy, girl 

 table person{      id      ...}  table boy{     id,     foreign key a_id= a.id, 1 one,     description,     ... } table girl{     id,     foreign key a_id= a.id, 1 one,      description,     ... }

table person can referenced once boy or girl. if person id, how can boy/girl information without trying initiate boy , girl? cause problem have many tables referenced table person, , if long.

i think better way place table name in person table ,, i.e add column in person table have name of table boy , girl etc.

then can refer correct table


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