sqlite/ext/wasm/demo-jsstorage.js

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/*
2022-09-12
The author disclaims copyright to this source code. In place of a
legal notice, here is a blessing:
* May you do good and not evil.
* May you find forgiveness for yourself and forgive others.
* May you share freely, never taking more than you give.
***********************************************************************
A basic test script for sqlite3.wasm with kvvfs support. This file
must be run in main JS thread and sqlite3.js must have been loaded
before it.
*/
'use strict';
(function(){
const T = self.SqliteTestUtil;
const toss = function(...args){throw new Error(args.join(' '))};
const debug = console.debug.bind(console);
const eOutput = document.querySelector('#test-output');
const logC = console.log.bind(console)
const logE = function(domElement){
eOutput.append(domElement);
};
const logHtml = function(cssClass,...args){
const ln = document.createElement('div');
if(cssClass) ln.classList.add(cssClass);
ln.append(document.createTextNode(args.join(' ')));
logE(ln);
}
const log = function(...args){
logC(...args);
logHtml('',...args);
};
const warn = function(...args){
logHtml('warning',...args);
};
const error = function(...args){
logHtml('error',...args);
};
const runTests = function(sqlite3){
const capi = sqlite3.capi,
oo = sqlite3.oo1,
wasm = sqlite3.wasm;
log("Loaded module:",capi.sqlite3_libversion(), capi.sqlite3_sourceid());
T.assert( 0 !== capi.sqlite3_vfs_find(null) );
if(!capi.sqlite3_vfs_find('kvvfs')){
error("This build is not kvvfs-capable.");
return;
}
const dbStorage = 0 ? 'session' : 'local';
const theStore = 's'===dbStorage[0] ? sessionStorage : localStorage;
const db = new oo.JsStorageDb( dbStorage );
// Or: oo.DB(dbStorage, 'c', 'kvvfs')
log("db.storageSize():",db.storageSize());
document.querySelector('#btn-clear-storage').addEventListener('click',function(){
const sz = db.clearStorage();
log("kvvfs",db.filename+"Storage cleared:",sz,"entries.");
});
document.querySelector('#btn-clear-log').addEventListener('click',function(){
eOutput.innerText = '';
});
document.querySelector('#btn-init-db').addEventListener('click',function(){
try{
const saveSql = [];
db.exec({
sql: ["drop table if exists t;",
"create table if not exists t(a);",
"insert into t(a) values(?),(?),(?)"],
bind: [performance.now() >> 0,
(performance.now() * 2) >> 0,
(performance.now() / 2) >> 0],
saveSql
});
console.log("saveSql =",saveSql,theStore);
log("DB (re)initialized.");
}catch(e){
error(e.message);
}
});
const btnSelect = document.querySelector('#btn-select1');
btnSelect.addEventListener('click',function(){
log("DB rows:");
try{
db.exec({
sql: "select * from t order by a",
rowMode: 0,
callback: (v)=>log(v)
});
}catch(e){
error(e.message);
}
});
document.querySelector('#btn-storage-size').addEventListener('click',function(){
log("size.storageSize(",dbStorage,") says", db.storageSize(),
"bytes");
});
log("Storage backend:",db.filename);
if(0===db.selectValue('select count(*) from sqlite_master')){
log("DB is empty. Use the init button to populate it.");
}else{
log("DB contains data from a previous session. Use the Clear Ctorage button to delete it.");
btnSelect.click();
}
};
sqlite3InitModule(self.sqlite3TestModule).then((sqlite3)=>{
runTests(sqlite3);
});
})();