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‎content/docs/02-objectql/protocol-spec.mdx‎

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‎content/docs/02-objectql/protocol-spec/aggregation.mdx‎

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---
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title: Aggregation Operations
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description: Complete reference for grouping and aggregating data in ObjectQL
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---
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# Aggregation Operations
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This document provides the complete specification for ObjectQL's Aggregation operations.
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## GroupBy
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```typescript
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db.aggregate(objectName: string, options: AggregateOptions)
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interface AggregateOptions {
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group_by: string[]
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having?: Filter[]
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fields?: AggregateField[]
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sort?: string | Sort[]
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limit?: number
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}
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```
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### Basic GroupBy
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```typescript
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// Count by category
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await db.aggregate('product', {
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group_by: ['category'],
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fields: [
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{ field: '_id', function: 'count', alias: 'total' }
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]
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})
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// Result: [
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// { category: 'Electronics', total: 45 },
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// { category: 'Books', total: 123 }
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// ]
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```
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### Multiple Groupings
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```typescript
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// Sales by year and quarter
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await db.aggregate('order', {
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group_by: ['YEAR(created)', 'QUARTER(created)'],
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fields: [
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{ field: 'amount', function: 'sum', alias: 'total_sales' },
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{ field: '_id', function: 'count', alias: 'order_count' }
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],
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sort: 'YEAR(created) desc, QUARTER(created) desc'
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})
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```
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## Aggregate Functions
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```typescript
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// Count
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{ field: '_id', function: 'count' }
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// Sum
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{ field: 'amount', function: 'sum' }
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// Average
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{ field: 'price', function: 'avg' }
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// Min
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{ field: 'price', function: 'min' }
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// Max
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{ field: 'price', function: 'max' }
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// Distinct count
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{ field: 'customer_id', function: 'count_distinct' }
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```
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## Having Clause
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Filter aggregated results:
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```typescript
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await db.aggregate('order', {
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group_by: ['customer_id'],
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fields: [
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{ field: 'amount', function: 'sum', alias: 'total_spent' },
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{ field: '_id', function: 'count', alias: 'order_count' }
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],
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having: [
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['total_spent', '>', 1000] // Only customers who spent > 1000
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]
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})
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```
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## Complete Aggregation Example
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```typescript
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// Monthly sales report with filters
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const monthlySales = await db.aggregate('invoice', {
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// Pre-aggregation filters (WHERE clause)
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filters: [
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['status', '=', 'paid'],
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['created', '>=', '2024-01-01']
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],
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// Group by
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group_by: ['YEAR(created)', 'MONTH(created)'],
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// Aggregate calculations
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fields: [
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{ field: 'amount', function: 'sum', alias: 'revenue' },
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{ field: '_id', function: 'count', alias: 'invoice_count' },
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{ field: 'amount', function: 'avg', alias: 'avg_invoice' },
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{ field: 'customer_id', function: 'count_distinct', alias: 'unique_customers' }
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],
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// Post-aggregation filters (HAVING clause)
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having: [
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['revenue', '>', 50000] // Only months with revenue > 50k
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],
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// Sort results
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sort: 'YEAR(created) desc, MONTH(created) desc',
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// Limit results
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limit: 12 // Last 12 months
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})
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// Result: [
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// {
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// year: 2024,
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// month: 3,
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// revenue: 125000,
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// invoice_count: 45,
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// avg_invoice: 2777.78,
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// unique_customers: 32
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// },
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// ...
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// ]
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```
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## Next Steps
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- Learn [Query DSL](/docs/02-objectql/protocol-spec/query-dsl) for basic queries
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- Master [Mutation Operations](/docs/02-objectql/protocol-spec/mutation) for data modification
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- Review [Schema Definition](/docs/02-objectql/protocol-spec/schema-definition) for data modeling

‎content/docs/02-objectql/protocol-spec/index.mdx‎

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---
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title: Protocol Specification
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description: Overview and reference guide for ObjectQL's protocol specification
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---
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# Protocol Specification
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ObjectQL uses a protocol-driven architecture with a comprehensive specification covering data modeling, querying, aggregation, and mutation operations. This specification ensures consistency across implementations and provides a clear contract for developers.
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## Core Components
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The ObjectQL protocol specification is divided into four main components:
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### [Schema Definition](/docs/02-objectql/protocol-spec/schema-definition)
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Define your data model with:
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- **Object definitions** - Database tables with metadata
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- **Field types** - Text, numeric, date/time, boolean, select, relationship, and special fields
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- **Field constraints** - Validation, indexes, and dependencies
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### [Query DSL](/docs/02-objectql/protocol-spec/query-dsl)
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Query your data with:
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- **Filters** - Comparison, string, list, null, and compound operators
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- **Sorting** - Single or multiple field ordering
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- **Pagination** - Limit and skip for efficient data retrieval
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- **Field selection** - Choose specific fields including related data
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### [Aggregation Operations](/docs/02-objectql/protocol-spec/aggregation)
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Analyze your data with:
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- **GroupBy** - Group records by one or more fields
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- **Aggregate functions** - Count, sum, average, min, max, distinct count
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- **Having clause** - Filter aggregated results
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- **Pre and post-aggregation filters** - WHERE and HAVING clauses
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### [Mutation Operations](/docs/02-objectql/protocol-spec/mutation)
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Modify your data with:
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- **Insert** - Create new records
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- **Update** - Modify existing records
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- **Delete** - Remove records
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- **Batch operations** - Efficient bulk operations
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## Protocol Principles
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The ObjectQL protocol follows these key principles:
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1. **Declarative** - Describe what you want, not how to get it
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2. **Type-safe** - Strong typing for reliability
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3. **Composable** - Build complex operations from simple building blocks
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4. **Efficient** - Optimized for performance at scale
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5. **Consistent** - Uniform patterns across all operations
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## Quick Start
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Here's a complete example using all protocol components:
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```typescript
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// 1. Define schema
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const schema = {
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objects: {
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customer: {
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label: 'Customer',
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fields: {
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name: { type: 'text', required: true },
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email: { type: 'email', unique: true },
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status: { type: 'select', options: ['active', 'inactive'] }
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}
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}
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}
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}
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// 2. Insert data
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await db.mutation('customer', {
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action: 'insert',
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data: { name: 'Acme Corp', email: '[email protected]', status: 'active' }
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})
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// 3. Query data
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const customers = await db.query('customer', {
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filters: [['status', '=', 'active']],
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sort: 'name asc',
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limit: 10
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})
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// 4. Aggregate data
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const stats = await db.aggregate('customer', {
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group_by: ['status'],
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fields: [{ field: '_id', function: 'count', alias: 'total' }]
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})
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```
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## Next Steps
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- Start with [Schema Definition](/docs/02-objectql/protocol-spec/schema-definition) to model your data
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- Learn [Query DSL](/docs/02-objectql/protocol-spec/query-dsl) to retrieve data
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- Master [Aggregation](/docs/02-objectql/protocol-spec/aggregation) for data analysis
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- Understand [Mutation Operations](/docs/02-objectql/protocol-spec/mutation) for data modification
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- Explore [Core Features](/docs/02-objectql/core-features) for advanced capabilities
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- Check [Core Concepts](/docs/02-objectql/core-concepts) for foundational knowledge

‎content/docs/02-objectql/protocol-spec/meta.json‎

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{
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"title": "Protocol Specification",
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"pages": [
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"schema-definition",
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"query-dsl",
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"aggregation",
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"mutation"
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]
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}

‎content/docs/02-objectql/protocol-spec/mutation.mdx‎

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---
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title: Mutation Operations
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description: Complete reference for inserting, updating, and deleting data in ObjectQL
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---
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# Mutation Operations
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This document provides the complete specification for ObjectQL's Mutation operations.
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## Insert
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```typescript
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await db.mutation('customer', {
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action: 'insert',
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data: {
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name: 'Acme Corp',
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email: '[email protected]',
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status: 'active'
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}
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})
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```
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## Update
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```typescript
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await db.mutation('customer', {
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action: 'update',
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filters: [['_id', '=', customerId]],
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data: {
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status: 'inactive',
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modified: new Date()
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}
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})
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```
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## Delete
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```typescript
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await db.mutation('customer', {
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action: 'delete',
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filters: [['status', '=', 'archived']]
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})
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```
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## Batch Operations
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### Batch Insert
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```typescript
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// Batch insert
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await db.mutation('product', {
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action: 'insert',
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data: [
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{ name: 'Product 1', price: 10 },
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{ name: 'Product 2', price: 20 },
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{ name: 'Product 3', price: 30 }
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]
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})
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```
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### Batch Update
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```typescript
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// Batch update
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await db.mutation('task', {
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action: 'update',
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filters: [['project_id', '=', projectId]],
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data: { status: 'cancelled' }
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})
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```
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## Next Steps
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- Learn [Query DSL](/docs/02-objectql/protocol-spec/query-dsl) for querying data
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- Explore [Aggregation](/docs/02-objectql/protocol-spec/aggregation) for data analysis
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- Review [Schema Definition](/docs/02-objectql/protocol-spec/schema-definition) for data modeling
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- Explore [Core Features](/docs/02-objectql/core-features) for performance optimizations
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- Master the [Server SDK](/docs/02-objectql/server-sdk) API reference

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