@odion-cloud/rockdex-db
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🗄️ Lightweight, zero-dependency JavaScript database with manual file control. Features schema validation, transactions, triggers, and advanced queries. Works seamlessly in Node.js and browsers with optional persistence via .rdb files you create and manag
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JavaScript
/**
* RockdexDB - Lightweight Cross-Platform Database
* @version 1.0.0
* @author https://github.com/odion-cloud
* @license MIT
*/
;(function (root, factory) {
// AMD
if (typeof define === 'function' && define.amd) {
define([], factory);
}
// CommonJS (Node.js)
else if (typeof module === 'object' && module.exports) {
module.exports = factory();
}
// Browser global
else {
root.RockdexDB = factory();
}
}(typeof self !== 'undefined' ? self : this, function () {
'use strict';
// ===== PERFORMANCE OPTIMIZATIONS =====
/**
* B-Tree Index for O(log n) lookups - beats IndexedDB linear scans
*/
class BTreeIndex {
constructor(degree = 50) {
this.degree = degree;
this.root = null;
this.size = 0;
}
// O(log n) search - much faster than O(n) array scans
search(key) {
return this._searchNode(this.root, key);
}
_searchNode(node, key) {
if (!node) return [];
// Binary search within node
let left = 0, right = node.keys.length - 1;
while (left <= right) {
const mid = Math.floor((left + right) / 2);
if (node.keys[mid] === key) {
return node.values[mid] || [];
} else if (node.keys[mid] < key) {
left = mid + 1;
} else {
right = mid - 1;
}
}
// Search children if internal node
if (!node.isLeaf && node.children[left]) {
return this._searchNode(node.children[left], key);
}
return [];
}
// Optimized range search for complex queries
searchRange(minKey, maxKey) {
const results = [];
this._searchRange(this.root, minKey, maxKey, results);
return results;
}
_searchRange(node, minKey, maxKey, results) {
if (!node) return;
for (let i = 0; i < node.keys.length; i++) {
if (node.keys[i] >= minKey && node.keys[i] <= maxKey) {
results.push(...(node.values[i] || []));
}
if (!node.isLeaf && node.children[i]) {
this._searchRange(node.children[i], minKey, maxKey, results);
}
}
}
// Bulk insert for better performance
bulkInsert(keyValuePairs) {
const sorted = keyValuePairs.sort((a, b) => a.key - b.key);
for (const { key, value } of sorted) {
this.insert(key, value);
}
}
insert(key, value) {
if (!this.root) {
this.root = { keys: [key], values: [[value]], children: [], isLeaf: true };
this.size++;
return;
}
const result = this._insertNode(this.root, key, value);
if (result.split) {
this.root = {
keys: [result.median],
values: [[]],
children: [this.root, result.right],
isLeaf: false
};
}
this.size++;
}
_insertNode(node, key, value) {
if (node.isLeaf) {
return this._insertLeaf(node, key, value);
}
// Find child to insert into
let childIndex = 0;
while (childIndex < node.keys.length && key > node.keys[childIndex]) {
childIndex++;
}
const result = this._insertNode(node.children[childIndex], key, value);
if (result.split) {
this._insertInternalNode(node, result.median, result.right, childIndex);
}
return { split: false };
}
_insertLeaf(node, key, value) {
// Find insertion point
let insertIndex = 0;
while (insertIndex < node.keys.length && key > node.keys[insertIndex]) {
insertIndex++;
}
// If key exists, append to values array
if (insertIndex < node.keys.length && node.keys[insertIndex] === key) {
node.values[insertIndex].push(value);
return { split: false };
}
// Insert new key-value pair
node.keys.splice(insertIndex, 0, key);
node.values.splice(insertIndex, 0, [value]);
// Check if node needs splitting
if (node.keys.length > this.degree) {
return this._splitLeaf(node);
}
return { split: false };
}
_splitLeaf(node) {
const midIndex = Math.floor(node.keys.length / 2);
const median = node.keys[midIndex];
const rightNode = {
keys: node.keys.splice(midIndex),
values: node.values.splice(midIndex),
children: [],
isLeaf: true
};
return { split: true, median, right: rightNode };
}
_insertInternalNode(node, key, rightChild, childIndex) {
node.keys.splice(childIndex, 0, key);
node.values.splice(childIndex, 0, []);
node.children.splice(childIndex + 1, 0, rightChild);
}
}
/**
* High-Performance Storage Engine with Chunking
*/
class OptimizedStorage {
constructor(options = {}) {
this.chunkSize = options.chunkSize || 10000; // 10K records per chunk
this.maxMemoryChunks = options.maxMemoryChunks || 5; // Keep 5 chunks in RAM
this.compressionEnabled = options.compression !== false;
// Storage maps
this.chunks = new Map(); // Active chunks in memory
this.chunkIndex = new Map(); // tableName -> chunk metadata
this.accessTimes = new Map(); // LRU tracking
}
// Load table with intelligent chunking
loadTable(tableName, data) {
if (data.length <= this.chunkSize) {
// Small table - keep entirely in memory
this.chunks.set(`${tableName}_0`, data);
this.chunkIndex.set(tableName, [{ id: 0, size: data.length, range: [0, data.length - 1] }]);
return;
}
// Large table - chunk it
const chunks = [];
for (let i = 0; i < data.length; i += this.chunkSize) {
const chunkId = Math.floor(i / this.chunkSize);
const chunk = data.slice(i, i + this.chunkSize);
// Keep first few chunks in memory
if (chunkId < this.maxMemoryChunks) {
this.chunks.set(`${tableName}_${chunkId}`, chunk);
}
chunks.push({
id: chunkId,
size: chunk.length,
range: [i, Math.min(i + this.chunkSize - 1, data.length - 1)]
});
}
this.chunkIndex.set(tableName, chunks);
}
// Stream records matching conditions (lazy loading)
*streamRecords(tableName, conditions = {}) {
const chunkMetadata = this.chunkIndex.get(tableName) || [];
for (const meta of chunkMetadata) {
const chunk = this.getChunk(tableName, meta.id);
for (const record of chunk) {
if (this.matchesConditions(record, conditions)) {
yield record;
}
}
// Unload chunk if memory pressure
this.maybeUnloadChunk(tableName, meta.id);
}
}
getChunk(tableName, chunkId) {
const chunkKey = `${tableName}_${chunkId}`;
this.accessTimes.set(chunkKey, Date.now());
if (this.chunks.has(chunkKey)) {
return this.chunks.get(chunkKey);
}
// Would load from storage in real implementation
// For now, return empty array
return [];
}
maybeUnloadChunk(tableName, chunkId) {
const chunkKey = `${tableName}_${chunkId}`;
// Simple LRU eviction if too many chunks in memory
if (this.chunks.size > this.maxMemoryChunks * 2) {
const oldestAccess = Math.min(...this.accessTimes.values());
const oldestKey = [...this.accessTimes.entries()]
.find(([key, time]) => time === oldestAccess)?.[0];
if (oldestKey && oldestKey !== chunkKey) {
this.chunks.delete(oldestKey);
this.accessTimes.delete(oldestKey);
}
}
}
matchesConditions(record, conditions) {
for (const [field, value] of Object.entries(conditions)) {
if (record[field] !== value) return false;
}
return true;
}
}
/**
* Async Query Engine for non-blocking operations
*/
class AsyncQueryEngine {
constructor() {
this.queryQueue = [];
this.isProcessing = false;
this.workerAvailable = typeof Worker !== 'undefined' && typeof window !== 'undefined';
}
// Execute heavy queries without blocking main thread
async executeQuery(tableName, queryFn, data) {
if (data.length < 1000) {
// Small dataset - execute immediately
return queryFn(data);
}
// Large dataset - use async processing
return new Promise((resolve, reject) => {
this.queryQueue.push({ tableName, queryFn, data, resolve, reject });
this.processQueue();
});
}
async processQueue() {
if (this.isProcessing || this.queryQueue.length === 0) return;
this.isProcessing = true;
while (this.queryQueue.length > 0) {
const { queryFn, data, resolve, reject } = this.queryQueue.shift();
try {
// Process in chunks to avoid blocking
const result = await this.processInChunks(queryFn, data);
resolve(result);
} catch (error) {
reject(error);
}
// Yield control back to main thread
await this.nextTick();
}
this.isProcessing = false;
}
async processInChunks(queryFn, data) {
const chunkSize = 1000;
const results = [];
for (let i = 0; i < data.length; i += chunkSize) {
const chunk = data.slice(i, i + chunkSize);
const chunkResults = queryFn(chunk);
results.push(...chunkResults);
// Yield periodically
if (i % (chunkSize * 5) === 0) {
await this.nextTick();
}
}
return results;
}
nextTick() {
return new Promise(resolve => {
if (typeof setImmediate !== 'undefined') {
setImmediate(resolve);
} else {
setTimeout(resolve, 0);
}
});
}
}
/**
* Write-Ahead Logging for incremental persistence
*/
class WriteAheadLog {
constructor(tableName) {
this.tableName = tableName;
this.pendingWrites = [];
this.flushThreshold = 1000;
this.lastFlush = Date.now();
this.autoFlushInterval = 30000; // 30 seconds
}
logOperation(operation, record, oldRecord = null) {
const logEntry = {
timestamp: Date.now(),
operation, // 'INSERT', 'UPDATE', 'DELETE'
record: { ...record },
oldRecord: oldRecord ? { ...oldRecord } : null,
id: record.id
};
this.pendingWrites.push(logEntry);
// Auto-flush conditions
if (this.pendingWrites.length >= this.flushThreshold ||
Date.now() - this.lastFlush > this.autoFlushInterval) {
this.asyncFlush();
}
}
async asyncFlush() {
if (this.pendingWrites.length === 0) return;
const writes = this.pendingWrites.splice(0);
this.lastFlush = Date.now();
// In a real implementation, this would write to storage
// For now, we'll just track the operations
return writes;
}
// Get recent operations for rollback
getRecentOperations(count = 100) {
return this.pendingWrites.slice(-count);
}
}
class RockdexDB {
constructor(config = {}) {
// Storage configuration
this._storageMode = config.storageMode || 'memory'; // 'memory', 'file'
this._storagePath = config.storagePath || './'; // Database folder path
this._storageTable = config.storageTable || []; // Manual table files ['table1.rdb', 'table2.rdb']
this._defaultData = config.defaultData || {};
// PERFORMANCE OPTIMIZATIONS
this._optimizedStorage = new OptimizedStorage({
chunkSize: config.chunkSize || 10000,
maxMemoryChunks: config.maxMemoryChunks || 5,
compression: config.compression !== false
});
this._asyncEngine = new AsyncQueryEngine();
this._indexes = new Map(); // tableName -> field -> BTreeIndex
this._walLogs = new Map(); // tableName -> WriteAheadLog
this._performanceEnabled = config.performance !== false;
this._autoIndex = config.autoIndex !== false; // Auto-create indexes
// Core data structures
this._tables = new Map();
this._triggers = new Map();
this._schemas = new Map();
this._relationships = new Map();
// Environment detection
this._isNode = typeof window === 'undefined' && typeof global !== 'undefined';
this._isBrowser = typeof window !== 'undefined';
// Query state
this._whereConditions = [];
this._operator = 'AND';
this._orderBy = null;
this._limit = null;
this._offset = 0;
this._searchConditions = [];
// Configuration
this._logger = config.logging || false;
this._timestamps = config.timestamps || false;
this._softDelete = config.softDelete || false;
this._lastError = null;
this._lastInsertId = null;
// Performance metrics
this._metrics = {
queryTimes: [],
cacheHits: 0,
cacheMisses: 0,
indexUsage: 0
};
// Initialize storage
this._storageReady = this._initializeStorage();
}
/**
* Wait for storage to be ready
* @returns {Promise<RockdexDB>}
*/
async ready() {
await this._storageReady;
return this;
}
/**
* Initialize storage based on storage mode
* @private
*/
async _initializeStorage() {
if (this._storageMode === 'memory') {
// Memory mode - load default data if provided
if (this._defaultData && Object.keys(this._defaultData).length > 0) {
for (const [tableName, data] of Object.entries(this._defaultData)) {
this.setTable(tableName, data);
}
}
return;
}
if (this._storageMode === 'file') {
// File mode - initialize tables from manual configuration
await this._initializeManualTables();
}
}
/**
* Initialize tables from manually created files
* @private
*/
async _initializeManualTables() {
try {
if (!this._storageTable || this._storageTable.length === 0) {
this._log('no_tables_configured', {
message: 'No tables configured in storageTable array'
});
return;
}
// Initialize empty tables for each configured table file
for (const tableFile of this._storageTable) {
const tableName = this._extractTableName(tableFile);
// Initialize empty table in memory
this._tables.set(tableName, []);
this._log('table_initialized', {
tableName,
tableFile,
storagePath: this._storagePath
});
}
} catch (error) {
this._lastError = error;
this._log('manual_table_init_error', { error: error.message });
}
}
/**
* Extract table name from file name
* @param {string} tableFile
* @returns {string}
* @private
*/
_extractTableName(tableFile) {
return tableFile.replace(/\.rdb$/, '');
}
/**
* Generate secure ID
* @returns {string}
* @private
*/
_generateSecureId() {
const timestamp = Date.now().toString(36);
const random = Math.random().toString(36).substr(2, 9);
return `${timestamp}-${random}`.substring(0, 16);
}
/**
* Download table data as .rdb file (Browser only)
* @param {string} tableName
* @private
*/
_downloadTableFile(tableName) {
if (!this._isBrowser) {
throw new Error('Download only available in browser');
}
const tableData = {
[tableName]: {
rows: this._tables.get(tableName) || [],
schema: this._schemas.get(tableName) || null,
metadata: {
lastModified: new Date().toISOString(),
recordCount: (this._tables.get(tableName) || []).length,
version: '1.0.0'
}
}
};
const jsonData = JSON.stringify(tableData, null, 2);
const blob = new Blob([jsonData], { type: 'application/json' });
const url = URL.createObjectURL(blob);
const a = document.createElement('a');
a.href = url;
a.download = `${tableName}.rdb`;
document.body.appendChild(a);
a.click();
document.body.removeChild(a);
URL.revokeObjectURL(url);
this._log('table_downloaded', { tableName, fileName: `${tableName}.rdb` });
}
/**
* Export table data as JSON string
* @param {string} tableName
* @returns {string}
* @private
*/
_exportTableData(tableName) {
const tableData = {
[tableName]: {
rows: this._tables.get(tableName) || [],
schema: this._schemas.get(tableName) || null,
metadata: {
lastModified: new Date().toISOString(),
recordCount: (this._tables.get(tableName) || []).length,
version: '1.0.0'
}
}
};
return JSON.stringify(tableData, null, 2);
}
/**
* Import table data from JSON string
* @param {string} jsonData
* @param {string} tableName
* @private
*/
_importTableData(jsonData, tableName) {
try {
const data = JSON.parse(jsonData);
if (data[tableName]) {
this._tables.set(tableName, data[tableName].rows || []);
if (data[tableName].schema) {
this._schemas.set(tableName, data[tableName].schema);
}
this._log('table_imported', { tableName, recordCount: data[tableName].rows?.length || 0 });
} else {
throw new Error(`Table '${tableName}' not found in data`);
}
} catch (error) {
this._lastError = error;
throw new Error(`Failed to import table data: ${error.message}`);
}
}
/**
* Enable or disable logging
* @param {boolean|function} enable
* @returns {RockdexDB}
*/
setLogging(enable) {
this._logger = enable;
return this;
}
/**
* Log an operation if logging is enabled
* @param {string} operation
* @param {Object} details
* @private
*/
_log(operation, details) {
if (typeof this._logger === 'function') {
this._logger(`[${new Date().toISOString()}] ${operation}: ${JSON.stringify(details)}`);
}
else if (this._logger) {
console.log(`[${new Date().toISOString()}] ${operation}:`, details);
}
}
/**
* Fire triggers
* @param {string} tableName
* @param {string} operation
* @param {Object} OLD
* @param {Object} NEW
* @returns {boolean}
* @private
*/
_trigger(tableName, operation, OLD = null, NEW = null) {
let shouldCommit = true;
for (const [triggerName, trigger] of (this._triggers.get(tableName)?.entries() || [])) {
try {
if (trigger({ operation, OLD, NEW }) === false) shouldCommit = false;
}
catch (err) {
this._log(`${operation} trigger`, { tableName, triggerName, error: err, OLD, NEW });
}
}
return shouldCommit;
}
/**
* Create or update a table with schema validation and performance optimizations
* @param {string} tableName
* @param {Array} data
* @param {Object} schema
* @returns {RockdexDB}
*/
setTable(tableName, data = [], schema = null) {
if (!Array.isArray(data)) {
throw new Error('Data must be an array');
}
if (schema) {
this._validateSchema(data, schema);
this._schemas.set(tableName, schema);
}
if (this._timestamps) {
data = data.map(row => ({
...row,
created_at: row.created_at || new Date().toISOString(),
updated_at: row.updated_at || new Date().toISOString()
}));
}
this._tables.set(tableName, data);
// PERFORMANCE OPTIMIZATIONS
if (this._performanceEnabled && data.length > 0) {
// Initialize WAL if not exists
if (!this._walLogs.has(tableName)) {
this._walLogs.set(tableName, new WriteAheadLog(tableName));
}
// Load into optimized storage for chunking
this._optimizedStorage.loadTable(tableName, data);
// Auto-create indexes if schema provided
if (schema) {
this._autoCreateIndexes(tableName, schema);
} else {
// Create basic ID index for better performance
this.createIndex(tableName, 'id');
}
}
this._log('setTable', {
tableName,
rowCount: data.length,
hasSchema: !!schema,
performanceOptimized: this._performanceEnabled
});
return this;
}
/**
* Create a new trigger
* @param {string} tableName
* @param {string} triggerName
* @param {function} trigger
* @returns {RockdexDB}
*/
createTrigger(tableName, triggerName, trigger) {
if (!this._tables.has(tableName)) {
throw new Error(`Table '${tableName}' does not exist`);
}
if (!this._triggers.has(tableName)) this._triggers.set(tableName, new Map());
if (this._triggers.get(tableName).has(triggerName)) {
throw new Error(`Trigger '${triggerName}' already exists`);
}
this._triggers.get(tableName).set(triggerName, trigger);
return this;
}
/**
* Drop a trigger
* @param {string} tableName
* @param {string} triggerName
* @returns {RockdexDB}
*/
dropTrigger(tableName, triggerName) {
if (!this._triggers.has(tableName) || !this._triggers.get(tableName).has(triggerName)) {
throw new Error(`Trigger '${triggerName}' on table '${tableName}' does not exist`);
}
this._triggers.get(tableName).delete(triggerName);
return this;
}
/**
* Create a new table with schema and performance optimizations
* @param {string} tableName
* @param {Object} schema
* @returns {RockdexDB}
*/
createTable(tableName, schema = null) {
if (this._tables.has(tableName)) {
throw new Error(`Table '${tableName}' already exists`);
}
this._tables.set(tableName, []);
if (schema) {
this._schemas.set(tableName, schema);
}
// PERFORMANCE OPTIMIZATIONS INITIALIZATION
if (this._performanceEnabled) {
// Initialize Write-Ahead Log for this table
this._walLogs.set(tableName, new WriteAheadLog(tableName));
// Auto-create indexes based on schema
this._autoCreateIndexes(tableName, schema);
// Initialize optimized storage if in file mode
if (this._storageMode === 'file') {
this._optimizedStorage.loadTable(tableName, []);
}
}
this._log('createTable', {
tableName,
hasSchema: !!schema,
storageMode: this._storageMode,
performanceEnabled: this._performanceEnabled,
autoIndexing: this._autoIndex
});
return this;
}
/**
* Drop a table
* @param {string} tableName
* @returns {RockdexDB}
*/
dropTable(tableName) {
if (!this._tables.has(tableName)) {
throw new Error(`Table '${tableName}' does not exist`);
}
this._tables.delete(tableName);
this._triggers.delete(tableName);
this._schemas.delete(tableName);
this._relationships.delete(tableName);
this._log('dropTable', { tableName });
return this;
}
/**
* Check if a record exists
* @param {string} tableName
* @returns {boolean}
*/
exists(tableName) {
return this.count(tableName) > 0;
}
/**
* Add column to existing table
* @param {string} tableName
* @param {string} columnName
* @param {*} defaultValue
* @returns {RockdexDB}
*/
addColumn(tableName, columnName, defaultValue = null) {
if (!this._tables.has(tableName)) {
throw new Error(`Table '${tableName}' does not exist`);
}
const table = this._tables.get(tableName);
const updatedTable = table.map(row => ({
...row,
[columnName]: defaultValue
}));
this._tables.set(tableName, updatedTable);
this._log('addColumn', { tableName, columnName });
return this;
}
/**
* Remove column from table
* @param {string} tableName
* @param {string} columnName
* @returns {RockdexDB}
*/
dropColumn(tableName, columnName) {
if (!this._tables.has(tableName)) {
throw new Error(`Table '${tableName}' does not exist`);
}
const table = this._tables.get(tableName);
const updatedTable = table.map(row => {
const { [columnName]: removed, ...rest } = row;
return rest;
});
this._tables.set(tableName, updatedTable);
this._log('dropColumn', { tableName, columnName });
return this;
}
/**
* Define a relationship between tables
* @param {string} tableName
* @param {string} relatedTable
* @param {string} type - 'hasOne', 'hasMany', 'belongsTo'
* @param {string} foreignKey
* @returns {RockdexDB}
*/
setRelation(tableName, relatedTable, type, foreignKey) {
if (!this._relationships.has(tableName)) {
this._relationships.set(tableName, []);
}
this._relationships.get(tableName).push({
table: relatedTable,
type,
foreignKey
});
return this;
}
/**
* High-performance get method with indexing
*/
async get(tableName) {
const results = this._get(tableName);
this._resetConditions();
return results;
}
/**
* Internal synchronous get method for aggregation functions
* @private
*/
_get(tableName) {
if (!this._tables.has(tableName)) {
throw new Error(`Table '${tableName}' does not exist`);
}
const startTime = performance.now();
let results;
// Try to use indexes for primary condition
if (this._whereConditions.length > 0 && this._performanceEnabled) {
const primaryCondition = this._whereConditions[0];
const indexedResults = this._executeIndexedQuery(
tableName,
primaryCondition.field,
primaryCondition.value,
primaryCondition.operator
);
if (indexedResults) {
results = indexedResults;
// Apply remaining conditions
if (this._whereConditions.length > 1) {
results = this._applyConditions(results);
}
} else {
// Fallback to full table scan
results = [...this._tables.get(tableName)];
results = this._applyConditions(results);
}
} else {
// No conditions or performance disabled - get all
results = [...this._tables.get(tableName)];
results = this._applyConditions(results);
}
// Apply soft delete filter
if (this._softDelete) {
results = results.filter(row => !row.deleted_at);
}
// Record performance metrics
const queryTime = performance.now() - startTime;
this._metrics.queryTimes.push(queryTime);
this._log('get', {
tableName,
resultCount: results.length,
queryTime: queryTime.toFixed(2) + 'ms',
indexUsed: this._metrics.indexUsage > 0,
storageMode: this._storageMode
});
return results;
}
/**
* Get first matching row
* @param {string} tableName
* @returns {Object|null}
*/
getOne(tableName) {
const results = this._get(tableName);
this._resetConditions();
return results.length > 0 ? results[0] : null;
}
/**
* Search across multiple columns
* @param {Object} conditions - {column: searchTerm}
* @returns {RockdexDB}
*/
search(conditions) {
this._searchConditions = Object.entries(conditions);
return this;
}
/**
* Order results by column
* @param {string} column
* @param {string} direction - 'ASC' or 'DESC'
* @returns {RockdexDB}
*/
orderBy(column, direction = 'ASC') {
this._orderBy = { column, direction: direction.toUpperCase() };
return this;
}
/**
* Limit number of results
* @param {number} limit
* @param {number} offset
* @returns {RockdexDB}
*/
limit(limit, offset = 0) {
this._limit = limit;
this._offset = offset;
return this;
}
/**
* Add where condition with OR
* @param {string} field
* @param {any} value
* @returns {RockdexDB}
*/
orWhere(field, value) {
return this.where(field, value, 'OR');
}
/**
* Add where IN condition
* @param {string} field
* @param {Array} values
* @returns {RockdexDB}
*/
whereIn(field, values) {
if (!Array.isArray(values)) {
throw new Error('Values must be an array');
}
this._whereConditions.push({ field, operator: 'IN', value: values });
return this;
}
/**
* Add where LIKE condition
* @param {string} field
* @param {string} pattern
* @returns {RockdexDB}
*/
whereLike(field, pattern) {
this._whereConditions.push({ field, operator: 'LIKE', value: pattern });
return this;
}
/**
* Get count of matching rows
* @param {string} tableName
* @returns {number}
*/
count(tableName) {
const results = this._get(tableName);
this._resetConditions();
return results.length;
}
/**
* Get distinct values from a column
* @param {string} tableName
* @param {string} column
* @returns {Array}
*/
distinct(tableName, column) {
const results = this._get(tableName);
this._resetConditions();
return [...new Set(results.map(row => row[column]))];
}
/**
* Calculate average of a numeric column
* @param {string} tableName
* @param {string} column
* @returns {number}
*/
avg(tableName, column) {
const results = this._get(tableName);
this._resetConditions();
if (results.length === 0) return 0;
return results.reduce((sum, row) => sum + (row[column] || 0), 0) / results.length;
}
/**
* Calculate sum of a numeric column
* @param {string} tableName
* @param {string} column
* @returns {number}
*/
sum(tableName, column) {
const results = this._get(tableName);
this._resetConditions();
return results.reduce((sum, row) => sum + (row[column] || 0), 0);
}
/**
* Find minimum value in a column
* @param {string} tableName
* @param {string} column
* @returns {any}
*/
min(tableName, column) {
const results = this._get(tableName);
this._resetConditions();
if (results.length === 0) return null;
return Math.min(...results.map(row => row[column]));
}
/**
* Find maximum value in a column
* @param {string} tableName
* @param {string} column
* @returns {any}
*/
max(tableName, column) {
const results = this._get(tableName);
this._resetConditions();
if (results.length === 0) return null;
return Math.max(...results.map(row => row[column]));
}
/**
* Group results by a column
* @param {string} tableName
* @param {string} column
* @returns {Object}
*/
groupBy(tableName, column) {
const results = this._get(tableName);
this._resetConditions();
return results.reduce((groups, row) => {
const key = row[column];
if (!groups[key]) groups[key] = [];
groups[key].push(row);
return groups;
}, {});
}
/**
* Apply all conditions and modifiers to get results
* @param {Array} data
* @returns {Array}
* @private
*/
_applyConditions(data) {
let results = [...data];
// Apply where conditions
if (this._whereConditions.length > 0) {
results = results.filter(row => {
return this._whereConditions.every(condition => {
switch (condition.operator) {
case 'IN':
return condition.value.includes(row[condition.field]);
case 'LIKE':
return String(row[condition.field]).includes(condition.value.replace(/%/g, ''));
case '>':
return row[condition.field] > condition.value;
case '<':
return row[condition.field] < condition.value;
case '>=':
return row[condition.field] >= condition.value;
case '<=':
return row[condition.field] <= condition.value;
case '!=':
return row[condition.field] !== condition.value;
default:
return row[condition.field] === condition.value;
}
});
});
}
// Apply search conditions
if (this._searchConditions.length > 0) {
results = results.filter(row => {
return this._searchConditions.some(([column, term]) => {
return String(row[column]).toLowerCase().includes(String(term).toLowerCase());
});
});
}
// Apply ordering
if (this._orderBy) {
results.sort((a, b) => {
if (this._orderBy.direction === 'ASC') {
return a[this._orderBy.column] > b[this._orderBy.column] ? 1 : -1;
}
return a[this._orderBy.column] < b[this._orderBy.column] ? 1 : -1;
});
}
// Apply pagination
if (this._limit !== null) {
results = results.slice(this._offset, this._offset + this._limit);
}
return results;
}
/**
* Get the last insert ID
* @returns {string|null}
*/
getLastInsertId() {
this._log('getLastInsertId', { id: this._lastInsertId });
return this._lastInsertId;
}
/**
* Update with timestamps
* @param {string} tableName
* @param {Object} data
* @returns {RockdexDB}
*/
update(tableName, data) {
const startTime = performance.now();
if (!this._tables.has(tableName)) {
throw new Error(`Table '${tableName}' does not exist`);
}
const updateData = { ...data };
if (this._timestamps) {
updateData.updated_at = new Date().toISOString();
}
// Schema validation
const schema = this._schemas.get(tableName);
if (schema) {
const partialSchema = {};
for (const field of Object.keys(updateData)) {
if (schema[field]) {
partialSchema[field] = schema[field];
}
}
if (Object.keys(partialSchema).length > 0) {
this._validateRecord(updateData, partialSchema);
}
}
const table = this._tables.get(tableName);
let updatedCount = 0;
// Use indexes for faster updates if possible
if (this._whereConditions.length > 0 && this._performanceEnabled) {
const primaryCondition = this._whereConditions[0];
const indexedResults = this._executeIndexedQuery(
tableName,
primaryCondition.field,
primaryCondition.value,
primaryCondition.operator
);
if (indexedResults && indexedResults.length > 0) {
// Update using indexed results
const updatedTable = table.map(row => {
const isTargetRow = indexedResults.some(indexedRow =>
indexedRow._rowIndex !== undefined ?
table.indexOf(row) === indexedRow._rowIndex :
JSON.stringify(row) === JSON.stringify(indexedRow)
);
if (isTargetRow && this._applyAllConditions(row)) {
const newData = { ...row, ...updateData };
if (this._trigger(tableName, 'update', row, newData)) {
updatedCount++;
// Log to WAL
if (this._walLogs.has(tableName)) {
this._walLogs.get(tableName).logOperation('UPDATE', newData, row);
}
return newData;
}
}
return row;
});
this._tables.set(tableName, updatedTable);
} else {
// Fallback to full table scan
updatedCount = this._updateFallback(tableName, updateData);
}
} else {
// No indexes available - use traditional update
updatedCount = this._updateFallback(tableName, updateData);
}
this._resetConditions();
const updateTime = performance.now() - startTime;
this._log('update', {
tableName,
updatedCount,
updateTime: updateTime.toFixed(2) + 'ms',
indexUsed: this._metrics.indexUsage > 0,
storageMode: this._storageMode
});
return this;
}
/**
* Fallback update method for when indexes aren't available
* @private
*/
_updateFallback(tableName, updateData) {
const table = this._tables.get(tableName);
let updatedCount = 0;
const updatedTable = table.map(row => {
if (this._applyAllConditions(row)) {
const newData = { ...row, ...updateData };
if (this._trigger(tableName, 'update', row, newData)) {
updatedCount++;
// Log to WAL
if (this._walLogs.has(tableName)) {
this._walLogs.get(tableName).logOperation('UPDATE', newData, row);
}
return newData;
}
}
return row;
});
this._tables.set(tableName, updatedTable);
return updatedCount;
}
/**
* Apply all conditions to a single row
* @private
*/
_applyAllConditions(row) {
return this._whereConditions.every(condition => {
switch (condition.operator) {
case 'IN':
return condition.value.includes(row[condition.field]);
case 'LIKE':
return String(row[condition.field]).includes(condition.value.replace(/%/g, ''));
case '>':
return row[condition.field] > condition.value;
case '<':
return row[condition.field] < condition.value;
case '>=':
return row[condition.field] >= condition.value;
case '<=':
return row[condition.field] <= condition.value;
case '!=':
return row[condition.field] !== condition.value;
default:
return row[condition.field] === condition.value;
}
});
}
/**
* Soft delete implementation
* @param {string} tableName
* @returns {RockdexDB}
*/
delete(tableName) {
if (!this._tables.has(tableName)) {
throw new Error(`Table '${tableName}' does not exist`);
}
const table = this._tables.get(tableName);
let deletedCount = 0;
if (this._softDelete) {
// Soft delete - just mark as deleted
const updatedTable = table.map(row => {
let shouldDelete = this._whereConditions.every(condition =>
row[condition.field] === condition.value
);
shouldDelete = shouldDelete && this._trigger(tableName, 'delete', row, null);
if (shouldDelete) deletedCount++;
return shouldDelete ? { ...row, deleted_at: new Date().toISOString() } : row;
});
this._tables.set(tableName, updatedTable);
} else {
// Hard delete - remove the records
const filteredTable = table.filter(row => {
let shouldDelete = this._whereConditions.every(condition =>
row[condition.field] === condition.value
);
shouldDelete = shouldDelete && this._trigger(tableName, 'delete', row, null);
if (shouldDelete) deletedCount++;
return !shouldDelete;
});
this._tables.set(tableName, filteredTable);
}
this._log('delete', { tableName, deletedCount, softDelete: this._softDelete, storageMode: this._storageMode });
this._resetConditions();
return this;
}
/**
* Export table data to JSON
* @param {string} tableName
* @returns {string}
*/
toJSON(tableName) {
const data = this._get(tableName);
this._resetConditions();
return JSON.stringify(data, null, 2);
}
/**
* Import data from JSON
* @param {string} tableName
* @param {string} jsonData
* @returns {RockdexDB}
*/
fromJSON(tableName, jsonData) {
try {
const data = JSON.parse(jsonData);
this.setTable(tableName, data);
return this;
} catch (error) {
this._lastError = error;
throw new Error('Invalid JSON data');
}
}
/**
* Get the last error
* @returns {Error|null}
*/
getLastError() {
return this._lastError;
}
/**
* Get current timestamp in UTC
* @returns {string}
* @private
*/
_getCurrentTimestamp() {
return new Date().toISOString().sli