Created model objects and DB layer.

src/main/groovy/com/jdbernard/nlsongs/db/NLSongsDB.groovy

@@ -0,0 +1,66 @@
+package com.jdbernard.nlsongs.db
+
+import java.sql.Connection
+import java.sql.PreparedStatement
+import java.sql.ResultSet
+import com.zaxxer.hikari.HikariDataSource
+
+import groovy.sql.GroovyRowResult
+import groovy.sql.Sql
+import groovy.transform.CompileStatic
+
+import com.jdbernard.nlsongs.model.*
+
+//@CompileStatic
+public class NLSongsDB {
+
+    private HikariDataSource dataSource
+    private Sql sql
+
+    public NLSongsDB(HikariDataSource dataSource) {
+        this.dataSource = dataSource
+        this.sql = new Sql(dataSource) }
+
+
+    public void shutdown() { dataSource.shutdown() }
+
+    // ### Services
+    public Service findService(int id) {
+        GroovyRowResult row = sql.firstRow(
+            "SELECT * FROM services WHERE id = ?", [id] as List<Object>)
+        if (row) return (Service) recordToModel(row, Service)
+        else return null }
+
+    // #### Utility functions
+    static def recordToModel(def row, Class clazz) {
+        def model = clazz.newInstance()
+
+        row.each { recordKey, v ->
+            def pts = recordKey.split('_')
+            def modelKey = pts.length == 1 ? pts[0] :
+                pts[0] + pts[1..-1].collect { it.capitalize() }.join()
+            model[modelKey] = v }
+        return model }
+
+    static def modelToRecord(def model) {
+        def record = [:]
+
+        model.properties.each { modelKey, v ->
+            if (modelKey == "class") return
+            def recordKey = modelKey.
+                replaceAll(/(\p{javaUpperCase})/, /_$1/).toLowerCase()
+            record[recordKey] = v }
+        return record }
+
+    /*
+    static Object recordToModel(GroovyRowResult row, Class clazz) {
+        Object model = clazz.newInstance()
+
+        row.each { recordKey, v -> 
+            String[] pts = ((String) recordKey).split('_')
+            String modelKey = pts[0] +
+                pts[1..-1].collect { it.capitalize() }.join()
+            model[modelKey] = v }
+    }
+    */
+}