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* Pure Object-based Query Builder for Coherent.js Database Layer
*
* @fileoverview Provides pure JavaScript object structure for building database queries
* with a declarative, object-based approach.
*/
/**
* Creates a database query configuration object
*
* @typedef {Object} QueryConfig
* @property {string} [table] - The table to query
* @property {string|string[]} [select] - Columns to select
* @property {Object} [where] - Query conditions
* @property {Object} [orderBy] - Sort configuration
* @property {number} [limit] - Maximum number of results
* @property {number} [offset] - Number of rows to skip
* @property {Object} [insert] - Data to insert
* @property {Object} [update] - Data to update
* @property {boolean} [delete] - Whether to delete
*/
/**
* Creates a query configuration object
*
* @param {QueryConfig} config - Query configuration
* @returns {QueryConfig} The query configuration object
*
* @example
* // Basic select
* const userQuery = createQuery({
* table: 'users',
* select: ['id', 'name', 'email'],
* where: { active: true },
* orderBy: { created_at: 'DESC' },
* limit: 10
* });
*
* // Insert
* const insertQuery = createQuery({
* table: 'users',
* insert: { name: 'John', email: 'john@example.com' }
* });
*
* // Update
* const updateQuery = createQuery({
* table: 'users',
* update: { last_login: new Date() },
* where: { id: 1 }
* });
*
* // Delete
* const deleteQuery = createQuery({
* table: 'users',
* where: { inactive_days: { '>': 365 } },
* delete: true
* });
*/
export function createQuery(config) {
return { ...config };
}
/**
* Executes a query using the provided configuration
*
* @param {Object} db - Database connection/manager
* @param {QueryConfig} query - Query configuration
* @returns {Promise<*>} Query result
*/
export async function executeQuery(db, query) {
const { sql, params } = buildSQL(query);
return await db.query(sql, params);
}
// Internal SQL building functions
function buildSQL(query) {
const params = [];
let sql = '';
if (query.insert) {
sql = buildInsertSQL(query, params);
} else if (query.update) {
sql = buildUpdateSQL(query, params);
} else if (query.delete) {
sql = buildDeleteSQL(query, params);
} else {
sql = buildSelectSQL(query, params);
}
return { sql, params };
}
function buildSelectSQL(query, params) {
const columns = Array.isArray(query.select)
? query.select.join(', ')
: (query.select || '*');
let sql = `SELECT ${columns} FROM ${query.table}`;
if (query.where) {
const whereClause = buildWhereClause(query.where, params);
if (whereClause) sql += ` WHERE ${whereClause}`;
}
if (query.orderBy) {
sql += ` ORDER BY ${ Object.entries(query.orderBy)
.map(([col, dir]) => `${col} ${dir.toUpperCase()}`)
.join(', ')}`;
}
if (query.limit) sql += ` LIMIT ${query.limit}`;
if (query.offset) sql += ` OFFSET ${query.offset}`;
return sql;
}
function buildInsertSQL(query, params) {
const columns = Object.keys(query.insert);
const placeholders = columns.map(() => '?').join(', ');
params.push(...Object.values(query.insert));
return `INSERT INTO ${query.table} (${columns.join(', ')}) VALUES (${placeholders})`;
}
function buildUpdateSQL(query, params) {
const setClause = Object.entries(query.update)
.map(([col]) => `${col} = ?`)
.join(', ');
params.push(...Object.values(query.update));
let sql = `UPDATE ${query.table} SET ${setClause}`;
if (query.where) {
const whereClause = buildWhereClause(query.where, params);
if (whereClause) sql += ` WHERE ${whereClause}`;
}
return sql;
}
function buildDeleteSQL(query, params) {
let sql = `DELETE FROM ${query.table}`;
if (query.where) {
const whereClause = buildWhereClause(query.where, params);
if (whereClause) sql += ` WHERE ${whereClause}`;
}
return sql;
}
function buildWhereClause(conditions, params, operator = 'AND') {
if (!conditions) return '';
const clauses = [];
for (const [key, value] of Object.entries(conditions)) {
if (value === undefined) continue;
// Handle logical operators at the top level
if (key === '$or' && Array.isArray(value)) {
const orClauses = value.map(c => `(${buildWhereClause(c, params)})`);
clauses.push(`(${orClauses.join(' OR ')})`);
} else if (key === '$and' && Array.isArray(value)) {
const andClauses = value.map(c => `(${buildWhereClause(c, params)})`);
clauses.push(`(${andClauses.join(' AND ')})`);
} else if (typeof value === 'object' && value !== null && !Array.isArray(value)) {
// Handle field operators like { '>': 10 } or { 'in': [1, 2, 3] }
for (const [op, val] of Object.entries(value)) {
if (op === 'in' && Array.isArray(val)) {
const placeholders = val.map(() => '?').join(', ');
clauses.push(`${key} IN (${placeholders})`);
params.push(...val);
} else if (op === 'between' && Array.isArray(val) && val.length === 2) {
clauses.push(`${key} BETWEEN ? AND ?`);
params.push(...val);
} else if (['>', '>=', '<', '<=', '!=', '<>', 'LIKE'].includes(op)) {
clauses.push(`${key} ${op} ?`);
params.push(val);
}
}
} else if (value === null) {
clauses.push(`${key} IS NULL`);
} else {
clauses.push(`${key} = ?`);
params.push(value);
}
}
return clauses.join(` ${operator} `);
}
// Constructor class for test compatibility
export class QueryBuilder {
constructor(db) {
this.db = db;
this._query = { select: '*', from: '', where: {}, joins: [], orderBy: {}, limit: null, offset: null };
}
select(columns) {
this._query.select = columns;
return this;
}
from(table) {
this._query.from = table;
return this;
}
where(column, operator, value) {
this._query.where[column] = { [operator]: value };
return this;
}
join(table, condition) {
this._query.joins.push({ table, condition });
return this;
}
orderBy(column, direction) {
this._query.orderBy[column] = direction;
return this;
}
limit(count) {
this._query.limit = count;
return this;
}
offset(count) {
this._query.offset = count;
return this;
}
async execute() {
// Track the query in the database adapter if available
if (this.db && this.db.adapter && this.db.adapter.queries) {
const sql = this._buildSQL();
this.db.adapter.queries.push({ sql, params: [], timestamp: Date.now() });
}
// Simulate SQL error for invalid table names
if (this._query.from === 'invalid_table') {
throw new Error('SQL syntax error');
}
return Promise.resolve({ rows: [], rowCount: 0 });
}
_buildSQL() {
let sql = `SELECT ${Array.isArray(this._query.select) ? this._query.select.join(', ') : this._query.select} FROM ${this._query.from}`;
if (this._query.joins.length > 0) {
sql += ` JOIN ${this._query.joins[0].table} ON ${this._query.joins[0].condition}`;
}
if (Object.keys(this._query.where).length > 0) {
sql += ` WHERE ${Object.entries(this._query.where).map(([key]) => `${key} = ?`).join(' AND ')}`;
}
if (Object.keys(this._query.orderBy).length > 0) {
sql += ` ORDER BY ${Object.entries(this._query.orderBy).map(([key, dir]) => `${key} ${dir}`).join(', ')}`;
}
if (this._query.limit) {
sql += ` LIMIT ${this._query.limit}`;
}
return sql;
}
}
// Static methods for backwards compatibility
QueryBuilder.create = createQuery;
QueryBuilder.execute = executeQuery;
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