Created model objects and DB layer.

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

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+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 }
+    }
+    */
+}

src/main/groovy/com/jdbernard/nlsongs/model/ApiKey.groovy

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+package com.jdbernard.nlsongs.model
+
+public class ApiKey implements Serializable {
+
+    String key
+    String description
+}

src/main/groovy/com/jdbernard/nlsongs/model/Performance.groovy

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+package com.jdbernard.nlsongs.model
+
+public class Performance implements Serializable {
+
+    int serviceId
+    int songId
+    String pianist
+    String organist
+    String bassist
+    String drummer
+    String guitarist
+    String leader
+}

src/main/groovy/com/jdbernard/nlsongs/model/Service.groovy

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+package com.jdbernard.nlsongs.model
+
+public class Service implements Serializable {
+
+    int id
+    Date date
+    ServiceType serviceType
+}

src/main/groovy/com/jdbernard/nlsongs/model/ServiceType.java

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+package com.jdbernard.nlsongs.model;
+
+public enum ServiceType { SUN_AM, SUN_PM, WED }

src/main/groovy/com/jdbernard/nlsongs/model/Song.groovy

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+package com.jdbernard.nlsongs.model
+
+public class Song implements Serializable {
+
+    int id
+    String name
+    List<String> artists
+}

src/main/groovy/com/jdbernard/nlsongs/model/User.groovy

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+package com.jdbernard.nlsongs.model
+
+public class User {
+
+    int id
+    String username
+    String pwd
+}

src/main/groovy/com/jdbernard/nlsongs/servlet/NLSongsContextListener.groovy

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+package com.jdbernard.nlsongs.servlet
+
+import javax.servlet.ServletContext
+import javax.servlet.ServletContextEvent
+import javax.servlet.ServletContextListener
+
+import com.jdbernard.nlsongs.db.NLSongsDB
+
+import com.zaxxer.hikari.HikariConfig
+import com.zaxxer.hikari.HikariDataSource
+
+public final class NLSongsContextListener implements ServletContextListener {
+
+    public void contextInitialized(ServletContextEvent event) {
+        context = event.servletContext
+
+        // Create the pooled data source
+        HikariConfig hcfg = new HikariConfig()
+        hcfg.username = 'TODO'
+        hcfg.password = 'TODO'
+        hcfg.dataSourceClassName = 'TODO'
+        hcfg.addDataSourceProperty('cachePrepStmts', 'true')
+        hcfg.addDataSourceProperty('prepStmtCacheSize', '250')
+        hcfg.addDataSourceProperty('prepStmtCacheSqlLimit', '2048')
+        hcfg.addDataSourceProperty('useServerPrepStmts', 'true')
+
+        HikariDataSource hds = new HikariDataSource(hcfg)
+
+        // Create the NLSonsDB instance.
+        NLSongsDB songsDB = new NLSongsDB(hds)
+
+        context.setAttribute('songsDB', songsDB) }
+
+    public void contextDestroyed(ServletContextEvent event) {
+        context = event.servletContext
+
+        // Shutdown the Songs DB instance (it will shut down the data source).
+        NLSongsDB songsDB = context.getAttribute('songsDB')
+        songsDB.shutdown()
+        
+        context.removeAttribute('songsDB') }
+}