add db interaction layer

src/database/service/ResultObjectService.kt

@@ -0,0 +1,57 @@
+package com.kmalbz.database.service
+
+import com.kmalbz.database.DatabaseFactory.dbQuery
+import com.kmalbz.database.model.ResultObject
+import com.kmalbz.database.dao.ResultObjects
+import org.jetbrains.exposed.sql.ResultRow
+import org.jetbrains.exposed.sql.select
+import org.jetbrains.exposed.sql.selectAll
+import java.time.LocalDate
+
+
+class ResultObjectService {
+
+    suspend fun getAllResultObjects(): List<ResultObject> = dbQuery {
+        ResultObjects.selectAll().map { toResultObject(it) }
+    }
+
+    suspend fun getResultObjectbyTag(tag: String): ResultObject? = dbQuery {
+        ResultObjects.select {
+            (ResultObjects.tag eq tag)
+        }.mapNotNull { toResultObject(it) }
+            .singleOrNull()
+    }
+
+    suspend fun getResultObjectbyDate(date: LocalDate): List<ResultObject>? = dbQuery {
+        ResultObjects.select {
+            (ResultObjects.date eq date)
+        }.mapNotNull { toResultObject(it) }
+    }
+
+    suspend fun getResultObjectbeforeDate(date: LocalDate): List<ResultObject>? = dbQuery {
+        ResultObjects.select {
+            (ResultObjects.date less  date)
+        }.mapNotNull { toResultObject(it) }
+    }
+
+    suspend fun getResultObjectafterDate(date: LocalDate): List<ResultObject>? = dbQuery {
+        ResultObjects.select {
+            (ResultObjects.date greater  date)
+        }.mapNotNull { toResultObject(it) }
+    }
+
+    suspend fun getResultObjectbyDecision(decision: Boolean): List<ResultObject>? = dbQuery {
+        ResultObjects.select {
+            (ResultObjects.decision eq  decision)
+        }.mapNotNull { toResultObject(it) }
+    }
+
+    private fun toResultObject(row: ResultRow): ResultObject =
+        ResultObject(
+            id = row[ResultObjects.id],
+            tag = row[ResultObjects.tag],
+            date = row[ResultObjects.date],
+            decision = row[ResultObjects.decision],
+            confidence = row[ResultObjects.confidence]
+        )
+}