Java SQL Querying With TextFields -


i wrote sql query , used textfield getting data. when textfield empty, gives data. how can stop that? here code:

string sql = "select * boek naam '%"             + txtnaam.gettext() + "%' or auteur '%"            + txtauteur.gettext() + "%' or categorie '%"             + txtcategorie.gettext() + "%' or opleiding '%"            + txtopleiding.gettext() + "%' not opleiding '%"             + txtopleiding.gettext() + "%' ";

i guess looking query text field(s) has value , ignore rest empty.

my suggestion be:

1) write java logics determine inputs program first. e.g. author, category selected fields , not empty.

2) run dedicated sql queries facilitate search inputs selected. e.g. in case, select using author , category

so, there few sql queries there. not 1 handles everything. less confusing in opinion. hope helps :)


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