Start adding some structure. Async loading of database is working.

src/database.js

@@ -0,0 +1,56 @@
+import React from 'react';
+
+export class DB {
+  state = {
+    db_object: false, // In current implementation, this is an alasql object.
+    db_name: false,
+  }
+
+  constructor(obj, name) {
+    this.state.db_object = obj;
+    this.state.db_name = name;
+  }
+
+  query(s) {
+    return this.state.db_object(s);
+  }
+}
+
+function fetch_db_from_sqlite(filename) {
+  return new Promise(function(resolve, reject) {
+    var initSqlJs = require('sql.js');
+    initSqlJs({ locateFile: filename => `/sql.js/dist/${filename}` })
+    .then( SQL => {
+      var asql = require('alasql');
+      // Attach to the SQLite database file,
+      // Create an IndexedDB to migrate it to, named "db",
+      // Get tables
+      var query = "";
+      query += "ATTACH SQLITE DATABASE db(\"" + filename + "\"); USE db;";
+      asql.promise(query)
+      .then(res => {
+        var imported_db = new DB(asql, "db");
+        resolve(imported_db);
+      });
+    });
+  });
+}
+
+export class FetchSQLiteDB extends React.Component {
+  state = {
+    loading: true,
+    error: false,
+    done: false,
+    db: false
+  };
+
+  componentDidMount() {
+    fetch_db_from_sqlite(this.props.sqlite_file)
+    .then(db => { this.setState({ loading: false, done: true, db: db }); })
+    .catch(error => this.setState({ loading: false, done: false, error }));
+  }
+
+  render() {
+    return this.props.children(this.state);
+  }
+}

src/fetch.js

@@ -0,0 +1,26 @@
+import React from 'react';
+
+export class Fetch extends React.Component {
+  state = {
+    loading: true,
+    error: false,
+    done: false,
+    data: [],
+  };
+
+  componentDidMount() {
+    fetch(this.props.url)
+      .then(res => {
+        if (!res.ok) {
+          throw new Error(res.status);
+        }
+        return res.arrayBuffer();
+      })
+      .then(data => this.setState({ loading: false, done: true, data }))
+      .catch(error => this.setState({ loading: false, done: false, error }));
+  }
+
+  render() {
+    return this.props.children(this.state);
+  }
+}

src/index.js

@@ -1,100 +1,46 @@
 import React from 'react';
 import ReactDOM from 'react-dom';
-import './index.css';
+import { Fetch } from './fetch.js';
-
+import { FetchSQLiteDB } from './database.js';
-var initSqlJs = require('sql.js');
-var alasql = require('alasql');
-
-var FetchTypeEnum = {
-  TO_VARIABLE: 1,
-  TO_LOCALSTORAGE: 2
-}
-
-class Fetch extends React.Component {
-  state = {
-    loading: true,
-    error: false,
-    done: false,
-    data: [],
-  };
-
-  componentDidMount() {
-    fetch(this.props.url)
-      .then(res => {
-        if (!res.ok) {
-          throw new Error(res.status);
-        }
-        return res.arrayBuffer();
-      })
-      .then(data => this.setState({ loading: false, done: true, data }))
-      .catch(error => this.setState({ loading: false, done: false, error }));
-  }
-
-  render() {
-    console.log(this.state);
-    return this.props.children(this.state);
-  }
-}
-
-class FetchSQLiteToIndexedDB extends React.Component {
-  state = {
-    loading: true,
-    error: false,
-    done: false,
-    sqlite_path: false,
-    indexed_db: false
-  };
-
-  componentDidMount() {
-    fetch(this.props.url)
-      .then(res => {
-        if (!res.ok) {
-          throw new Error(res.status);
-        }
-        return res.arrayBuffer();
-      })
-      .then(sqlite_data => this.setState({ loading: true, done: false }))
-      .catch(error => this.setState({ loading: false, done: false, error }));
-  }
 
-  render() {
+import './index.css';
-    console.log(this.state);
-    return this.props.children(this.state);
-  }
-}
-
-const Loading = ({url}) => <p>Loading: {url}</p>;
 
-const Error = ({error}) => <p>Oops! Something went wrong: {error.message}</p>;
+const URLLoading = ({url}) => <p>Loading: {url}</p>;
+const URLError = ({error}) => <p>Failed to load URL resource: {error.message}</p>;
+const URLFinished = ({url, data}) => <p>{url} was loaded: {data.byteLength} bytes received.</p>;
 
-const Finished = ({url, data}) => <p>{url} was loaded: {data.byteLength} bytes received.</p>;
+const DBLoading = ({sqlite_file}) => <p>Loading: {sqlite_file}</p>;
+const DBError = ({error}) => <p>Failed to load database: {error.message}</p>;
+const DBFinished = ({sqlite_file, db}) => <p>{sqlite_file} was loaded. Name: { db.state.db_name }. Tables: { JSON.stringify(db.query("SHOW TABLES;")) } </p>;
 
 const TestFetch = ({url}) => (
   <Fetch url={url}>
     {({ loading, error, done, data }) => (
       <>
-        { loading && <Loading url={url}/> }
+        { loading && <URLLoading url={url}/> }
-        { error && <Error error={error} />}
+        { error && <URLError error={error} />}
-        { done && <Finished url={url} data={data} /> }
+        { done && <URLFinished url={url} data={data} /> }
       </>
     )}
   </Fetch>
 )
 
-// alasql(['ATTACH SQLITE DATABASE testdb("/test.sqlite");\
+const TestDBFetch = ({sqlite_file}) => (
-//             SELECT * FROM images']).then(function(res){
+  <FetchSQLiteDB sqlite_file={sqlite_file}>
-//                 console.log("Images:",res.pop());
+    {({ loading, error, done, db }) => (
-//         });
+      <>
-
+        { loading && <DBLoading sqlite_file={sqlite_file}/> }
-initSqlJs({ locateFile: filename => `/sql.js/dist/${filename}` }).then( SQL => {
+        { error && <DBError error={error} />}
-  alasql(['ATTACH SQLITE DATABASE test("/test.sqlite");\
+        { done && <DBFinished sqlite_file={sqlite_file} db={db} /> }
-            USE test;\
+      </>
-            SELECT * FROM images']).then(function(res){
+    )}
-                console.log("Images:",res.pop());
+  </FetchSQLiteDB>
-        });
+)
-      } );
 
 ReactDOM.render(
-  <TestFetch url={process.env.PUBLIC_URL + "/stuff"} />,
+  <>
+  <TestFetch url={process.env.PUBLIC_URL + "/stuff"} />
+  <TestDBFetch sqlite_file={process.env.PUBLIC_URL + "/test.sqlite"} />
+  </>,
   document.getElementById('root')
 );