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400 lines
10 KiB
HTML
400 lines
10 KiB
HTML
<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="utf-8">
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<title>JSDoc: Source: services/sql.js</title>
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<body>
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<div id="main">
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<h1 class="page-title">Source: services/sql.js</h1>
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<section>
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<article>
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<pre class="prettyprint source linenums"><code>"use strict";
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/**
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* @module sql
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*/
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const log = require('./log');
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const Database = require('better-sqlite3');
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const dataDir = require('./data_dir');
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const cls = require('./cls');
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const dbConnection = new Database(dataDir.DOCUMENT_PATH);
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dbConnection.pragma('journal_mode = WAL');
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[`exit`, `SIGINT`, `SIGUSR1`, `SIGUSR2`, `SIGTERM`].forEach(eventType => {
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process.on(eventType, () => {
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if (dbConnection) {
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// closing connection is especially important to fold -wal file into the main DB file
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// (see https://sqlite.org/tempfiles.html for details)
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dbConnection.close();
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}
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});
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});
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function insert(tableName, rec, replace = false) {
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const keys = Object.keys(rec);
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if (keys.length === 0) {
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log.error("Can't insert empty object into table " + tableName);
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return;
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}
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const columns = keys.join(", ");
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const questionMarks = keys.map(p => "?").join(", ");
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const query = "INSERT " + (replace ? "OR REPLACE" : "") + " INTO " + tableName + "(" + columns + ") VALUES (" + questionMarks + ")";
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const res = execute(query, Object.values(rec));
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return res ? res.lastInsertRowid : null;
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}
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function replace(tableName, rec) {
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return insert(tableName, rec, true);
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}
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function upsert(tableName, primaryKey, rec) {
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const keys = Object.keys(rec);
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if (keys.length === 0) {
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log.error("Can't upsert empty object into table " + tableName);
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return;
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}
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const columns = keys.join(", ");
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const questionMarks = keys.map(colName => "@" + colName).join(", ");
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const updateMarks = keys.map(colName => `${colName} = @${colName}`).join(", ");
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const query = `INSERT INTO ${tableName} (${columns}) VALUES (${questionMarks})
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ON CONFLICT (${primaryKey}) DO UPDATE SET ${updateMarks}`;
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for (const idx in rec) {
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if (rec[idx] === true || rec[idx] === false) {
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rec[idx] = rec[idx] ? 1 : 0;
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}
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}
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execute(query, rec);
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}
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const statementCache = {};
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function stmt(sql) {
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if (!(sql in statementCache)) {
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statementCache[sql] = dbConnection.prepare(sql);
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}
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return statementCache[sql];
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}
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function getRow(query, params = []) {
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return wrap(query, s => s.get(params));
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}
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function getRowOrNull(query, params = []) {
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const all = getRows(query, params);
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return all.length > 0 ? all[0] : null;
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}
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function getValue(query, params = []) {
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const row = getRowOrNull(query, params);
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if (!row) {
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return null;
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}
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return row[Object.keys(row)[0]];
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}
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// smaller values can result in better performance due to better usage of statement cache
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const PARAM_LIMIT = 100;
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function getManyRows(query, params) {
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let results = [];
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while (params.length > 0) {
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const curParams = params.slice(0, Math.min(params.length, PARAM_LIMIT));
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params = params.slice(curParams.length);
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const curParamsObj = {};
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let j = 1;
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for (const param of curParams) {
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curParamsObj['param' + j++] = param;
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}
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let i = 1;
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const questionMarks = curParams.map(() => ":param" + i++).join(",");
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const curQuery = query.replace(/\?\?\?/g, questionMarks);
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const statement = curParams.length === PARAM_LIMIT
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? stmt(curQuery)
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: dbConnection.prepare(curQuery);
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const subResults = statement.all(curParamsObj);
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results = results.concat(subResults);
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}
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return results;
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}
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function getRows(query, params = []) {
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return wrap(query, s => s.all(params));
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}
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function iterateRows(query, params = []) {
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return stmt(query).iterate(params);
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}
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function getMap(query, params = []) {
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const map = {};
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const results = getRows(query, params);
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for (const row of results) {
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const keys = Object.keys(row);
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map[row[keys[0]]] = row[keys[1]];
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}
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return map;
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}
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function getColumn(query, params = []) {
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const list = [];
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const result = getRows(query, params);
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if (result.length === 0) {
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return list;
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}
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const key = Object.keys(result[0])[0];
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for (const row of result) {
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list.push(row[key]);
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}
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return list;
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}
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function execute(query, params = []) {
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return wrap(query, s => s.run(params));
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}
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function executeWithoutTransaction(query, params = []) {
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dbConnection.run(query, params);
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}
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function executeMany(query, params) {
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while (params.length > 0) {
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const curParams = params.slice(0, Math.min(params.length, PARAM_LIMIT));
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params = params.slice(curParams.length);
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const curParamsObj = {};
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let j = 1;
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for (const param of curParams) {
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curParamsObj['param' + j++] = param;
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}
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let i = 1;
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const questionMarks = curParams.map(() => ":param" + i++).join(",");
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const curQuery = query.replace(/\?\?\?/g, questionMarks);
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dbConnection.prepare(curQuery).run(curParamsObj);
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}
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}
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function executeScript(query) {
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return dbConnection.exec(query);
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}
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function wrap(query, func) {
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const startTimestamp = Date.now();
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let result;
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try {
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result = func(stmt(query));
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}
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catch (e) {
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if (e.message.includes("The database connection is not open")) {
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// this often happens on killing the app which puts these alerts in front of user
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// in these cases error should be simply ignored.
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console.log(e.message);
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return null
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}
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throw e;
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}
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const milliseconds = Date.now() - startTimestamp;
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if (milliseconds >= 20) {
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if (query.includes("WITH RECURSIVE")) {
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log.info(`Slow recursive query took ${milliseconds}ms.`);
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}
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else {
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log.info(`Slow query took ${milliseconds}ms: ${query.trim().replace(/\s+/g, " ")}`);
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}
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}
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return result;
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}
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function transactional(func) {
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try {
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const ret = dbConnection.transaction(func).deferred();
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if (!dbConnection.inTransaction) { // i.e. transaction was really committed (and not just savepoint released)
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require('./ws.js').sendTransactionEntityChangesToAllClients();
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}
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return ret;
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}
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catch (e) {
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cls.clearEntityChanges();
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throw e;
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}
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}
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function fillParamList(paramIds, truncate = true) {
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if (paramIds.length === 0) {
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return;
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}
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if (truncate) {
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execute("DELETE FROM param_list");
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}
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paramIds = Array.from(new Set(paramIds));
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if (paramIds.length > 30000) {
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fillParamList(paramIds.slice(30000), false);
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paramIds = paramIds.slice(0, 30000);
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}
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// doing it manually to avoid this showing up on the sloq query list
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const s = stmt(`INSERT INTO param_list VALUES ` + paramIds.map(paramId => `(?)`).join(','), paramIds);
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s.run(paramIds);
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}
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module.exports = {
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dbConnection,
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insert,
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replace,
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/**
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* Get single value from the given query - first column from first returned row.
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*
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* @method
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* @param {string} query - SQL query with ? used as parameter placeholder
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* @param {object[]} [params] - array of params if needed
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* @return [object] - single value
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*/
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getValue,
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/**
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* Get first returned row.
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*
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* @method
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* @param {string} query - SQL query with ? used as parameter placeholder
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* @param {object[]} [params] - array of params if needed
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* @return {object} - map of column name to column value
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*/
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getRow,
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getRowOrNull,
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/**
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* Get all returned rows.
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*
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* @method
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* @param {string} query - SQL query with ? used as parameter placeholder
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* @param {object[]} [params] - array of params if needed
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* @return {object[]} - array of all rows, each row is a map of column name to column value
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*/
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getRows,
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iterateRows,
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getManyRows,
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/**
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* Get a map of first column mapping to second column.
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*
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* @method
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* @param {string} query - SQL query with ? used as parameter placeholder
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* @param {object[]} [params] - array of params if needed
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* @return {object} - map of first column to second column
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*/
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getMap,
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/**
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* Get a first column in an array.
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*
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* @method
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* @param {string} query - SQL query with ? used as parameter placeholder
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* @param {object[]} [params] - array of params if needed
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* @return {object[]} - array of first column of all returned rows
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*/
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getColumn,
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/**
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* Execute SQL
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*
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* @method
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* @param {string} query - SQL query with ? used as parameter placeholder
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* @param {object[]} [params] - array of params if needed
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*/
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execute,
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executeWithoutTransaction,
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executeMany,
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executeScript,
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transactional,
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upsert,
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fillParamList
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};
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</code></pre>
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</article>
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</section>
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</div>
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<nav>
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<h2><a href="index.html">Home</a></h2><h3>Modules</h3><ul><li><a href="module-sql.html">sql</a></li></ul><h3>Classes</h3><ul><li><a href="ApiToken.html">ApiToken</a></li><li><a href="Attribute.html">Attribute</a></li><li><a href="BackendScriptApi.html">BackendScriptApi</a></li><li><a href="Branch.html">Branch</a></li><li><a href="Entity.html">Entity</a></li><li><a href="Note.html">Note</a></li><li><a href="NoteRevision.html">NoteRevision</a></li><li><a href="Option.html">Option</a></li><li><a href="RecentNote.html">RecentNote</a></li></ul><h3><a href="global.html">Global</a></h3>
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Documentation generated by <a href="https://github.com/jsdoc/jsdoc">JSDoc 3.6.6</a>
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