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switch(field) {
case 0:
filter = "a.opros_opros like '%'";
break;
case 1:
filter = "a.opros_opros like '" + param[0] + "'";
break;
case 2:
filter = "a.opros_name like '" + param[1] + "'";
break;
case 3:
filter = "a.opros_opros like '" + param[0] + "' and a.opros_name like '" + param[1] + "'";
break;
}
String sql = <blah-blah-blah> + filter+ <blah-blah-blah>;
подобная инициализация String filter = null;
и отстутствие default добавляют коду пикантности