Right usage of Where query in ORMLite for android

Question

I am trying to generate a where query through ormlite.

eg:Where name='Ärer' and (type='tt1' or type='tt2')

But the result always apppears like this

SELECT * FROM `Test` WHERE ((((((`name` = 'Arer' AND `type` = 'tt1' ) OR `type` = 'tt2' ) OR `type` = 'tt3' ) OR `type` = 'tt4' ) OR `type` = 'tt5' ) ) 

This is java code that i have used to generate the above query

Where<Test, Integer> whereStatement = queryBuilder.where();

int cnt = 0;
String[] channelArray = getChannelSettingsForDB();
whereStatement.eq(NAME, "Arer")
    .and();
for (String channel : channelArray) {
    if (channel != null) {
        whereStatement.eq(TYPE, channel).or();
    }

Kindly let me know the right way of usage to generate a where query like this

Where name='Ärer' and (type='tt1' or type='tt2' or type='tt3' or type='tt4' or type='tt5')

Answer 1

But the result always apppears like this

... OR type = 'tt2' ) OR type = 'tt3' ...

Everytime ORMLite adds an and() or or() it is going to add parenthesis to be specific about the and/or arguments. These methods take the previous clause and then do the operation with the next clause submitted.

In your case the first clause is the eq(NAME, "Arer") which gets and-ed with the first eq(TYPE, channel). This is not what you want.

Kindly let me know the right way of usage to generate a where query like this ...

There are a couple of ways for you to do what you want to do. The first way uses the where.or(int) feature which absorbs a number of clauses and separate them via OR.

whereStatement.eq(NAME, "Arer");
int channelCount = 0;
for (String channel : channelArray) {
    if (channel != null) {
        whereStatement.eq(TYPE, channel);
        channelCount++;
    }
}
if (channelCount > 0) {
    // or the last X clauses together
    whereStatement.or(channelCount);
    // and the channel ORs with the name
    whereStatement.and(2);
}

However you might consider using the where.in(...) method instead. It won't handle nulls however so you will have to copy your array into a list or other iterable:

List<String> channels = new ArrayList<String>(channelArray.length);
for (String channel : channelArray) {
    if (channel != null) {
        channels.add(channel);
    }
}
if (!channels.isEmpty()) {
    // the IN replaces a bunch of ORs
    whereStatement.in(TYPE, channels);
    // and the channel IN with the name
    whereStatement.and(2);
}

For the various different ways to build queries, please RTFM:

http://ormlite.com/docs/building-queries