Multiple filters in Room database android

Question

I want to query with multiple filters using room database. For example

 @Query("SELECT SUM(total_amount) as total FROM settlement_table where date_and_time>=:fromDate and date_and_time<=:toDate and orderType=:orderType and user_id=:user_id")
    fun getSettlementDataTotalAmountOrderTypeUserId(fromDate: Long, toDate: Long,orderType:Int?,user_id: String?): ModelSum

I have a situation when user_id and orderType is null. some time either one is null. But when I pass null value it return no data How can I acheive filter with single query?

Answer 1

If you need to valid null then you need do some modifications.

@Entity(tableName = "settlement_table")
data class Settlement(
    @PrimaryKey(autoGenerate = true) @ColumnInfo(name = "id") val id: Long = 0,
    @ColumnInfo(name = "user_id") val user_id: String? = "-1",
    @ColumnInfo(name = "orderType") val longitude: Int? = -1,
    @ColumnInfo(name = "total_amount") val total_amount: Int,
    @ColumnInfo(name = "date_and_time") val date_and_time: Long
)

Table where you have set default values when you insert values as null. So, now your query will be

  @Query("SELECT SUM(total_amount) as total FROM settlement_table where date_and_time>=:fromDate and date_and_time<=:toDate and orderType=:orderType and user_id=:user_id")
    fun getSettlementDataTotalAmountOrderTypeUserId(
        fromDate: Long,
        toDate: Long,
        orderType: Int? = -1,
        user_id: String? = "-1"
    ): ModelSum

Here you can see we set default values while insert to -1 and while performing query also we using the same values if that orderType & user_id found null

EDIT

then there is simple thing you need to do , You need to create three method with same name with different params, like Method overloading. Method 1 : With Both not null

@Query("SELECT SUM(total_amount) as total FROM settlement_table where date_and_time>=:fromDate and date_and_time<=:toDate and orderType=:orderType and user_id=:user_id")
        fun getSettlementDataTotalAmountOrderTypeUserId(
            fromDate: Long,
            toDate: Long,
            orderType: Int,
            user_id: String
        ): ModelSum

Method 2 : With orderType is null

@Query("SELECT SUM(total_amount) as total FROM settlement_table where date_and_time>=:fromDate and date_and_time<=:toDate and user_id=:user_id")
        fun getSettlementDataTotalAmountOrderTypeUserId(
            fromDate: Long,
            toDate: Long,         
            user_id: String
        ): ModelSum

Method 2 : With user_id is null

@Query("SELECT SUM(total_amount) as total FROM settlement_table where date_and_time>=:fromDate and date_and_time<=:toDate and orderType=:orderType")
        fun getSettlementDataTotalAmountOrderTypeUserId(
            fromDate: Long,
            toDate: Long,         
            orderType: Int
        ): ModelSum

So when calling this method you need make conditions

if(orderType!=null && user_id!=null)    {
// Call method 1
}else if(user_id!=null)    {
// Call method 2
}else if(orderType!=null)    {
// Call method 3
}

Hope it will helps you with your issue