Query builder dbflow conditional query - orm

Question

how can i build a query based on certain conditions .
i tried doing this
QueryBuilder builder = SQlite.Select().from(Table)
if(condition) {
builder.where(something)
}
Cursor c = builder.query;
but it is not permitted.
I have to query my database on conditions that i have saved in preferences . I googled and searched everywhere in thr docs but couldn't find a single example . do this feature exists in dbflow if yes then how if no is thr any other orm (like greenDAO) with this feature

Answer 1

You can create conditional queries in DBFlow. To query a table's columns you must append _Table to your class name, then access its property. These _Table classes are generated during build time.
The most simple query would be this one:
SQLite.select()
.from(YourTable.class)
.where(YourTable_Table.id.eq(someId)
.queryList();
You can also add new conditions by using .and and .or in your query:
SQLite.select()
.from(YourTable.class)
.where(YourTable_Table.id.eq(someId)
.and(YourTable_Table.name.eq(someName)
.queryList();
For a cleaner code, you can also group conditions into condition groups like this:
ConditionGroup conditionGroup = ConditionGroup.clause();
conditionGroup.and(YourTable_Table.id.eq(someId);
if (someCondition) {
conditionGroup.and(YourTable_Table.name.eq(someName);
}
return SQLite.select()
.from(YourTable.class)
.where(conditionGroup)
.queryList();

Answer 2

found two ways of achieving my problem
1.from #trevjonez(trevor jones)
Where<SomeModel> query = SQLite.select()
.from(SomeModel.class)
.where(SomeModel_Table.date_field.greaterThan(someValue));
if(someCondition) {
query = query.and(SomeModel_Table.other_field.eq(someOtherValue));
} else {
query = query.and(SomeModel_Table.another_field.isNotNull());
}
Cursor cursor = query.query();
//do stuff with cursor and close it
—
2.from #zshock using ConditionalGroup
ConditionGroup conditionGroup = ConditionGroup.clause();
conditionGroup.and(YourTable_Table.id.eq(someId);
if (someCondition) {
conditionGroup.and(YourTable_Table.name.eq(someName);
}
return SQLite.select()
.from(YourTable.class)
.where(conditionGroup)
.queryList();