server/AyaNova/DataList/DataListSqlSelectBuilder.cs

@@ -0,0 +1,85 @@
+using System.Collections.Generic;
+using System;
+using System.Globalization;
+using System.Text;
+using Newtonsoft.Json.Linq;
+using System.Linq;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.Logging;
+
+namespace AyaNova.DataList
+{
+    internal static class DataListSqlSelectBuilder
+    {
+
+        //Build the SELECT portion of a list query based on the template, mini or full and the object key in question 
+        internal static string Build(List<AyaDataListFieldDefinition> objectFieldsList, string template, bool mini)
+        {
+
+            //parse the template
+            var jtemplate = JObject.Parse(template);
+
+
+            //convert to strings array (https://stackoverflow.com/a/33836599/8939)
+            string[] templateFieldList;
+            if (mini)
+            {
+                templateFieldList = ((JArray)jtemplate["mini"]).ToObject<string[]>();
+            }
+            else
+            {
+                templateFieldList = ((JArray)jtemplate["full"]).ToObject<string[]>();
+            }
+
+            StringBuilder sb = new StringBuilder();
+            sb.Append("SELECT ");
+
+            //Default ID column for each row (always is aliased as df)
+            AyaDataListFieldDefinition def = objectFieldsList.FirstOrDefault(x => x.FieldKey == "df");
+            if (def == null)
+            {
+                throw new System.ArgumentNullException("SqlSelectBuilder: objectFieldList is missing the df default field");
+            }
+            if (string.IsNullOrEmpty(def.SqlIdColumnName))
+            {
+                sb.Append("id");//default when no alternate column is specified
+            }
+            else
+            {
+                sb.Append(def.SqlIdColumnName);
+            }
+
+            sb.Append(" AS df");
+
+            foreach (string ColumnName in templateFieldList)
+            {
+                AyaDataListFieldDefinition o = objectFieldsList.FirstOrDefault(x => x.FieldKey == ColumnName);
+#if (DEBUG)
+                //Developers little helper
+                if (o == null)
+                {
+                    throw new System.ArgumentNullException($"DEV ERROR in SqlSelectBuilder.cs: field {ColumnName} specified in template was NOT found in ObjectFields list");
+                }
+#endif
+                if (o != null)
+                {//Ignore missing fields in production
+
+                    sb.Append(", ");
+                    sb.Append(o.GetSqlValueColumnName());
+
+                    //does it also have an ID column?
+                    if (!string.IsNullOrWhiteSpace(o.SqlIdColumnName))
+                    {
+                        sb.Append(", ");
+                        sb.Append(o.SqlIdColumnName);
+                    }
+                }
+            }
+
+            return sb.ToString();
+        }
+
+
+
+    }//eoc
+}//ens