added BaseIntrospector and reorganized connections

app/src/data/connection/sqlite/SqliteConnection.ts

@@ -0,0 +1,50 @@
+import type { ColumnDataType, ColumnDefinitionBuilder, Kysely, KyselyPlugin } from "kysely";
+import { jsonArrayFrom, jsonBuildObject, jsonObjectFrom } from "kysely/helpers/sqlite";
+import { Connection, type DbFunctions, type FieldSpec, type SchemaResponse } from "../Connection";
+
+export class SqliteConnection extends Connection {
+   constructor(kysely: Kysely<any>, fn: Partial<DbFunctions> = {}, plugins: KyselyPlugin[] = []) {
+      super(
+         kysely,
+         {
+            ...fn,
+            jsonArrayFrom,
+            jsonObjectFrom,
+            jsonBuildObject,
+         },
+         plugins,
+      );
+   }
+
+   override supportsIndices(): boolean {
+      return true;
+   }
+
+   override getFieldSchema(spec: FieldSpec): SchemaResponse {
+      this.validateFieldSpecType(spec.type);
+      let type: ColumnDataType = spec.type;
+
+      switch (spec.type) {
+         case "json":
+            type = "text";
+            break;
+      }
+
+      return [
+         spec.name,
+         type,
+         (col: ColumnDefinitionBuilder) => {
+            if (spec.primary) {
+               return col.primaryKey().notNull().autoIncrement();
+            }
+            if (spec.references) {
+               let relCol = col.references(spec.references);
+               if (spec.onDelete) relCol = relCol.onDelete(spec.onDelete);
+               if (spec.onUpdate) relCol = relCol.onUpdate(spec.onUpdate);
+               return relCol;
+            }
+            return spec.nullable ? col : col.notNull();
+         },
+      ] as const;
+   }
+}