Rearranged repo to make room for additional projects

ComiServ/Extensions/DatabaseExtensions.cs

@@ -0,0 +1,61 @@
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.ChangeTracking;
+using System.Runtime.CompilerServices;
+
+//https://stackoverflow.com/a/42467710/25956209
+//https://archive.ph/RvjOy
+namespace ComiServ.Extensions;
+
+public static class DatabaseExtensions
+{
+    //with a compound primary key, `ignorePrimaryKey` will ignore all of them
+    public static int InsertOrIgnore<T>(this DbContext context, T item, bool ignorePrimaryKey = false)
+    {
+        var entityType = context.Model.FindEntityType(typeof(T));
+        var tableName = entityType.GetTableName();
+        //var tableSchema = entityType.GetSchema();
+
+        var cols = entityType.GetProperties()
+            .Where(c => !ignorePrimaryKey || !c.IsPrimaryKey())
+            .Select(c => new {
+                Name = c.GetColumnName(),
+                //Type = c.GetColumnType(),
+                Value = c.PropertyInfo.GetValue(item)
+            })
+            .ToList();
+        var query = "INSERT OR IGNORE INTO " + tableName
+            + " (" + string.Join(", ", cols.Select(c => c.Name)) + ") " +
+            "VALUES (" + string.Join(", ", cols.Select((c,i) => "{" + i + "}")) + ")";
+        var args = cols.Select(c => c.Value).ToArray();
+        var formattable = FormattableStringFactory.Create(query, args);
+        return context.Database.ExecuteSql(formattable);
+    }
+    public static int InsertOrIgnore<T>(this DbContext context, IEnumerable<T> items, bool ignorePrimaryKey = false)
+    {
+        var entityType = context.Model.FindEntityType(typeof(T));
+        var tableName = entityType.GetTableName();
+        //var tableSchema = entityType.GetSchema();
+
+        var colProps = entityType.GetProperties().Where(c => !ignorePrimaryKey || !c.IsPrimaryKey()).ToList();
+        var colNames = colProps.Select(c => c.Name).ToList();
+        if (colNames.Count == 0)
+            throw new InvalidOperationException("No columns to insert");
+        var rows = items
+            .Select(item =>
+                colProps.Select(c =>
+                    c.PropertyInfo.GetValue(item))
+                .ToList())
+            .ToList();
+        int count = 0;
+        var query = "INSERT OR IGNORE INTO " + tableName
+            + "(" + string.Join(',', colNames) + ")"
+            + "VALUES" + string.Join(',', rows.Select(row =>
+                "(" + string.Join(',', row.Select(v => "{" 
+                + count++
+                + "}")) + ")"
+            ));
+        var args = rows.SelectMany(row => row).ToArray();
+        var formattable = FormattableStringFactory.Create(query, args);
+        return context.Database.ExecuteSql(formattable);
+    }
+}