neat

Neat ORM

A powerful and elegant ORM (Object-Relational Mapping) library for Go, designed to provide a clean and intuitive interface for database operations. Neat aims to feature parity with Laravel's Eloquent ORM while being built from scratch without GORM dependencies.

Features

• Query Builder: Fluent and intuitive query building interface
• ORM: Full ORM support with models and relationships
• Schema Builder: Database schema creation and modification
• Migrations: Complete database migration system with the Migrator package, schema builder, rollback support, and automatic tracking (major advantage over most Go ORMs)
• Seeders: Database seeding for test and initial data
• Factories: Test data generation with factory pattern
• Multiple Database Support: MySQL, PostgreSQL, SQLite, SQL Server, Turso, Oracle, CSVDB
• Transactions: Robust transaction support
• Observers: Model lifecycle event system
• Soft Deletes: Soft delete functionality with multiple strategies (NULL-based and max-date sentinel)
• Associations: BelongsTo, HasMany, HasOne, PolymorphicBelongsTo, PolymorphicHasMany relationships with eager and lazy loading
• Views: Create, drop, and introspect database views via CreateView, CreateViewRaw, DropView, DropViewIfExists, HasView across all supported drivers
• Array-Backed Sources: Query in-memory slices of structs or []map[string]any as if they were database tables using NewArraySourceFrom — zero boilerplate, no custom ArraySource struct required
• CSVDB Driver: Query a directory of CSV files as if they were database tables — each .csv file becomes a table, with automatic type inference, BOM stripping, and transaction-wrapped bulk loading
• Connection Pooling: Efficient connection management
• Context Support: Full context.Context support throughout
• Query Method Aliases: Sequelize-style (FindAll, FindOne, Destroy) and Django-style (Filter, Exclude, All)
• Sugar Methods: Convenience methods (CountAsVar, FirstAsVar, etc.) that return values directly for improved usability
• ToSql Interface: SQL generation without execution
• Dotted Column References: table.column syntax supported in OrderBy, OrderByDesc, Group, Distinct, and WhereColumn
• Security Hardening: SQL injection prevention with identifier validation

Key Advantage: Complete Migration System

🚀 Most Go ORMs lack comprehensive schema migration support. Neat ORM includes a complete migration system with the Migrator package, schema builder, rollback support, and automatic tracking - something most competitors either lack entirely or require third-party tools for.

Installation

go get github.com/dracory/neat

Documentation

• HTML Documentation - Browse documentation in your browser
• Examples - Practical examples for various features

Quick Start

package main

import (
    "context"
    "log"
    
    "github.com/dracory/neat"
)

type User struct {
    ID    uint
    Name  string
    Email string
}

func main() {
    // Create database connection
    db, err := neat.NewFromDSN("mysql://user:password@localhost:3306/mydb")
    if err != nil {
        log.Fatal(err)
    }
    defer db.Close()
    
    // Query users
    var users []User
    err = db.Query().Where("name", "John").Get(&users)
    if err != nil {
        log.Fatal(err)
    }
    
    log.Printf("Found %d users", len(users))
}

Configuration

Using DSN String

db, err := neat.NewFromDSN("mysql://user:password@localhost:3306/mydb")

Using DBConfig

config := neat.DBConfig{
    Default: "default",
    Connections: map[string]neat.ConnectionConfig{
        "default": {
            Driver:   "mysql",
            Host:     "localhost",
            Port:     3306,
            Database: "mydb",
            Username: "user",
            Password: "password",
        },
    },
}

db, err := neat.New(config)

Supported DSN Formats

• MySQL: mysql://user:password@localhost:3306/database
• PostgreSQL: postgres://user:password@localhost:5432/database?sslmode=disable
• SQLite: sqlite:///path/to/database.db
• SQL Server: sqlserver://user:password@localhost:1433?database=database

ORM Usage

Models

Neat maps Go structs to database tables using struct tags. For detailed information on table names, column names, and tag priority, see Models Documentation.

Creating Records

user := User{
    Name:  "John Doe",
    Email: "john@example.com",
}
err := db.Query().Create(&user)

Querying Records

var user User
err := db.Query().Where("id", 1).First(&user)

var users []User
err := db.Query().Where("name", "John").Get(&users)

Updating Records

err := db.Query().Where("id", 1).Update("name", "Jane")

Deleting Records

result, err := db.Query().Where("id", 1).Delete()

Transactions

err := db.Transaction(func(tx neat.Query) error {
    err := tx.Create(&user1)
    if err != nil {
        return err
    }
    
    err = tx.Create(&user2)
    if err != nil {
        return err
    }
    
    return nil
})

Schema Builder

err := db.Schema().Create("users", func(table neat.Blueprint) {
    table.ID()
    table.String("name")
    table.String("email").Unique()
    table.Timestamps()
})

Views

// Create a view from a query builder
err := db.Schema().CreateView("active_users", db.Query().Table("users").Where("active", true))

// Create a view from raw SQL
err := db.Schema().CreateViewRaw("user_summary", "SELECT user_id, COUNT(*) FROM orders GROUP BY user_id")

// Check existence
exists := db.Schema().HasView("active_users")

// Drop (with if-exists guard)
err := db.Schema().DropViewIfExists("active_users")

See Views Documentation for per-driver notes.

Observers

type UserObserver struct{}

func (o *UserObserver) Creating(event neat.Event) error {
    log.Println("Creating user")
    return nil
}

func (o *UserObserver) Created(event neat.Event) error {
    log.Println("User created")
    return nil
}

// Register observer
db.Orm().Observe([]neat.ModelToObserver{
    {Model: User{}, Observer: UserObserver{}},
})

Soft Deletes

type User struct {
    neat.SoftDeletes
    ID   uint
    Name string
}

// Soft delete
db.Query().Where("id", 1).Delete()

// Include soft-deleted records
db.Query().WithTrashed().Where("id", 1).First(&user)

// Only soft-deleted records
db.Query().OnlyTrashed().Where("id", 1).First(&user)

// Restore soft-deleted record
db.Query().Restore(&user)

// Force delete (permanent)
db.Query().ForceDelete(&user)

Associations

type Post struct {
    ID     uint
    Title  string
    UserID uint
}

type User struct {
    ID    uint
    Name  string
    Posts []Post
}

// Eager loading
db.Query().With("posts").Where("id", 1).First(&user)

// Lazy loading
db.Query().Load(&user, "posts")

// Association operations
db.Query().Association("posts").Append(&user, &post)

Array-Backed Sources

Query in-memory slices as if they were database tables — useful for static data (statuses, countries), mocking in tests, or querying computed datasets.

type Status struct {
    ID    int    `db:"id"`
    Name  string `db:"name"`
    Color string `db:"color"`
}

statuses := []Status{
    {ID: 1, Name: "Pending", Color: "yellow"},
    {ID: 2, Name: "Active",  Color: "green"},
    {ID: 3, Name: "Inactive", Color: "red"},
}

var results []Status
err := db.Query().
    Model(neat.NewArraySourceFrom(statuses)).
    Where("name = ?", "Active").
    OrderBy("id", "asc").
    Get(&results)

NewArraySourceFrom accepts a slice of structs or []map[string]any. The table name is auto-generated and the schema is inferred from the data. See Array Source Documentation and the array driver examples.

CSVDB Driver

Query a directory of CSV files as if they were database tables — useful for data exports, reports, test fixtures, and datasets. The directory is the database; each .csv file is a table; the filename (without .csv) is the table name.

config := neat.DBConfig{
    Default: "csv_db",
    Connections: map[string]neat.ConnectionConfig{
        "csv_db": {
            Driver:   "csvdb",
            Database: "data/",   // directory path
        },
    },
}

db, _ := neat.New(config)
defer db.Close()

// data/users.csv → "users" table
var users []User
err := db.Query().Model(&User{}).Where("active = ?", true).Get(&users)

Column types are inferred from the CSV data (INTEGER, REAL, DATETIME, TEXT). The CSV header row defines column names. All tables are loaded into an in-memory SQLite database at connection open time, so the full query builder works: WHERE, JOIN, ORDER BY, aggregates, etc. See the csvdb-driver example and the proposal.

Supported Databases

• MySQL 5.7+
• PostgreSQL 12+
• SQLite 3+
• SQL Server 2017+
• Turso (SQLite edge)
• Oracle
• CSVDB (CSV directory as database)

Driver Compatibility Matrix

Notes:

• Turso is a SQLite edge database, so it shares SQLite's placeholder style and PRAGMA support
• CSVDB uses in-memory SQLite under the hood, so it shares SQLite's placeholder style, PRAGMA support, and single-connection constraint. The Database field holds a directory path (not a file path or DSN)
• Transaction Isolation Levels: SQLite has limited isolation level support (SERIALIZABLE only), MySQL/PostgreSQL/Oracle/SQL Server support all standard levels
• Savepoints: All drivers support savepoints through the standard database/sql interface
• Connection Pool: All drivers support standard database/sql connection pooling parameters

Connection Pool Configuration

Neat ORM provides sensible defaults for connection pooling, but you can customize these settings based on your application's needs.

Pool Configuration Options

Pool settings are configured on the DBConfig.Pool field using neat.PoolConfig (durations use time.Duration):

config := neat.DBConfig{
    Default: "default",
    Connections: map[string]neat.ConnectionConfig{
        "default": {
            Driver:   "mysql",
            Host:     "localhost",
            Port:     3306,
            Database: "mydb",
            Username: "user",
            Password: "password",
        },
    },
    Pool: neat.PoolConfig{
        MaxIdleConns:    5,                    // Maximum number of idle connections
        MaxOpenConns:    25,                   // Maximum number of open connections
        ConnMaxLifetime: 3600 * time.Second,   // Connection lifetime (1 hour)
        ConnMaxIdleTime: 300 * time.Second,    // Maximum idle time (5 minutes)
        QueryTimeout:    30 * time.Second,     // Query timeout (default: 30 seconds)
    },
}

db, err := neat.New(config)

SQLite-Specific Configuration

Why SQLite uses MaxOpen=1:

SQLite has a fundamental limitation: it allows only one writer at a time. Multiple concurrent write operations will cause "database is locked" errors. To prevent this, Neat automatically enforces MaxOpenConns=1 and MaxIdleConns=1 for SQLite connections, regardless of your pool configuration.

SQLite Pool Defaults:

• MaxOpenConns: 1 (enforced to prevent writer contention)
• MaxIdleConns: 1 (enforced to prevent writer contention)
• QueryTimeout: 30 seconds
• PRAGMA Optimizations: Automatically applied (WAL mode, foreign keys, busy timeout)

Turso (SQLite Edge):

Turso is a SQLite edge database that inherits SQLite's single-writer limitation. The same pool constraints apply to Turso connections:

• MaxOpenConns: 1 (enforced to prevent writer contention)
• MaxIdleConns: 1 (enforced to prevent writer contention)
• QueryTimeout: 30 seconds
• PRAGMA Optimizations: Automatically applied (WAL mode, foreign keys, busy timeout)

When to use SQLite/Turso:

• Development and testing
• Low-traffic applications
• Single-process services
• Embedded applications
• Edge computing scenarios (Turso)

When to avoid SQLite/Turso:

• High-concurrency write workloads
• Multi-process services requiring concurrent writes
• Production applications with significant write traffic

MySQL/PostgreSQL/SQL Server/Oracle Configuration

These databases support true concurrent connections and can handle larger connection pools.

Production Defaults:

• MaxOpenConns: 25 (adjust based on your database server capacity)
• MaxIdleConns: 5 (keeps a small pool of ready connections)
• ConnMaxLifetime: 3600 seconds (1 hour)
• ConnMaxIdleTime: 300 seconds (5 minutes)
• QueryTimeout: 30 seconds

Development Defaults:

• MaxOpenConns: 10 (lower for local development)
• MaxIdleConns: 2 (minimal idle connections)
• ConnMaxLifetime: 1800 seconds (30 minutes)
• ConnMaxIdleTime: 300 seconds (5 minutes)
• QueryTimeout: 30 seconds

Workload-Specific Recommendations

The examples below show only the Pool field of neat.DBConfig. Durations use time.Duration.

Read-Heavy Workloads:

Pool: neat.PoolConfig{
    MaxIdleConns:    10,                  // More idle connections for quick reads
    MaxOpenConns:    50,                  // Higher open connection limit
    ConnMaxLifetime: 7200 * time.Second,  // Longer lifetime (2 hours)
    QueryTimeout:    10 * time.Second,    // Shorter timeout for reads
}

Write-Heavy Workloads:

Pool: neat.PoolConfig{
    MaxIdleConns:    5,                   // Fewer idle connections
    MaxOpenConns:    20,                  // Moderate open connection limit
    ConnMaxLifetime: 3600 * time.Second,  // Standard lifetime (1 hour)
    QueryTimeout:    60 * time.Second,    // Longer timeout for writes
}

High-Concurrency Applications:

Pool: neat.PoolConfig{
    MaxIdleConns:    20,                  // Larger idle pool
    MaxOpenConns:    100,                 // High open connection limit
    ConnMaxLifetime: 1800 * time.Second,  // Shorter lifetime (30 minutes)
    ConnMaxIdleTime: 120 * time.Second,   // Shorter idle time (2 minutes)
    QueryTimeout:    30 * time.Second,
}

Low-Traffic Services:

Pool: neat.PoolConfig{
    MaxIdleConns:    2,                   // Minimal idle connections
    MaxOpenConns:    5,                   // Low open connection limit
    ConnMaxLifetime: 3600 * time.Second,  // Standard lifetime
    QueryTimeout:    30 * time.Second,
}

Monitoring and Tuning

Monitor your connection pool metrics to optimize performance:

• Pool Hit Rate: High hit rate indicates good pool utilization
• Wait Time: Long wait times suggest increasing MaxOpenConns
• Connection Age: Frequent reconnections suggest increasing ConnMaxLifetime
• Idle Connections: Too many idle connections waste resources, reduce MaxIdleConns

Important Notes

• SQLite Constraints: SQLite pool settings are automatically overridden to prevent "database is locked" errors
• Query Timeout: Default is 30 seconds, adjust based on your query complexity
• Connection Lifetime: Set shorter lifetimes for cloud databases with connection limits
• Pool Size: Never set MaxOpenConns higher than your database server's max connection limit

API Documentation

For detailed API documentation, see the docs directory.

Examples

For more examples, see the examples directory.

License

This project is licensed under the GNU Affero General Public License v3.0 - see the LICENSE file for details.

Testing

Running Integration Tests with Docker Compose

The project includes a Docker Compose configuration for running integration tests locally with MySQL and PostgreSQL:

# Start the database containers
docker-compose up -d

# Run MySQL integration tests
go test -v -tags=integration ./integration_tests/mysql/...

# Run PostgreSQL integration tests
go test -v -tags=integration ./integration_tests/postgres/...

# Stop the containers when done
docker-compose down

The Docker Compose setup includes:

• MySQL 8.0 on port 3306 (user: root, password: root, database: test)
• PostgreSQL 15 on port 55432 (user: test, password: test, database: test)

Running Unit Tests

go test ./...

Running All Tests

go test -v ./...

Generating Coverage Reports

To generate a coverage report locally:

# Generate coverage profile
go test -coverprofile=coverage.out -covermode=atomic ./...

# View coverage percentage in terminal
go tool cover -func=coverage.out

# Generate HTML coverage report
go tool cover -html=coverage.out -o coverage.html

The HTML report can be opened in a browser to see detailed coverage information for each file and function.

Contributing

Contributions are welcome! Please open an issue or submit a pull request.

Roadmap

Current Status

Neat ORM is actively developed with the following features implemented:

• ✅ Query Builder with fluent interface and Sugar Methods
• ✅ ORM with model support
• ✅ Schema Builder for database operations
• ✅ Advanced Migration system (Migrator package)
• ✅ Seeder system for data seeding
• ✅ Factory pattern for test data
• ✅ Multiple database support (MySQL, PostgreSQL, SQLite, SQL Server, Turso, Oracle, CSVDB)
• ✅ Transaction support with savepoints and callbacks
• ✅ Observer system for model events
• ✅ Soft deletes with multiple strategies (NULL and Max-Date)
• ✅ Associations (BelongsTo, HasMany, HasOne, Polymorphic)
• ✅ View management (CreateView, CreateViewRaw, DropView, DropViewIfExists, HasView)
• ✅ Array-backed sources (NewArraySourceFrom for struct and map slices)
• ✅ CSVDB driver (query CSV directory as database with type inference)
• ✅ Connection pooling
• ✅ Context support

Planned Features

• Additional migration drivers (SQL, custom drivers)
• More relationship types (HasManyThrough, BelongsToMany)
• Query caching
• Full-text search support
• Scopes and global scopes
• Mutators and accessors
• Model casting
• Validation integration
• Query builder debugging tools
• Additional database drivers

For detailed implementation plans, see docs/implementation/gaps.md.