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Add db migration drivers, dev-migration tool, and swap repr dependency
- Add lib/db/migration/{mysql,postgres,sqlite}: per-engine schema migration drivers - Add dev-migration/: standalone development tool for testing migrations - Replace github.com/alecthomas/repr with github.com/kr/pretty in repr.go Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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‎dev-migration/README.md‎

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# EVO Migration Development & Testing
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This directory contains a comprehensive migration testing suite for the EVO database migration system with support for MySQL, MariaDB, PostgreSQL, and SQLite.
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## Features
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### 📋 Complete Model Coverage
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- **Users**: Primary keys, unique indexes, soft deletes
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- **UserProfiles**: Foreign keys, nullable fields, custom types
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- **Posts**: Full-text search, enums, composite indexes
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- **Comments**: Self-referencing FKs, composite indexes
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- **Categories**: Custom table options, hierarchical data
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- **Tags**: Many-to-many relationships, simple structures
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- **PostTags**: Junction tables, composite primary keys
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- **Settings**: JSON fields, unique constraints
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- **Logs**: Versioned migrations, audit trails
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- **SessionData**: String primary keys, nullable FKs
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### 🗄️ Database Support Matrix
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| Feature | MySQL | MariaDB | PostgreSQL | SQLite |
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|---------|-------|---------|------------|--------|
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| Auto Increment | ✅ AUTO_INCREMENT | ✅ AUTO_INCREMENT | ✅ SERIAL/BIGSERIAL | ✅ AUTOINCREMENT |
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| JSON Fields | ✅ JSON | ⚠️ LONGTEXT | ✅ JSONB | ⚠️ TEXT |
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| ENUM Types | ✅ ENUM | ✅ ENUM | ⚠️ VARCHAR(255) | ⚠️ TEXT |
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| Full-Text Search | ✅ FULLTEXT | ✅ FULLTEXT | ⚠️ GIN Indexes | ⚠️ FTS5 |
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| Foreign Keys | ✅ Full Support | ✅ Full Support | ✅ Full Support | ⚠️ Limited |
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| Unique Indexes | ✅ | ✅ | ✅ | ✅ |
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| Composite Indexes | ✅ | ✅ | ✅ | ✅ |
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| Table Comments | ✅ | ✅ | ✅ | ❌ |
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| Column Comments | ✅ | ✅ | ⚠️ Separate | ❌ |
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## Quick Start
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### 1. Setup Database
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#### SQLite (Default)
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```bash
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cd dev-migration
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go run . -test # Uses config.sqlite.yml
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```
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#### MySQL
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```bash
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# Update config.mysql.yml with your credentials
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cp config.mysql.yml config.yml # Or set ENV vars
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go run . -test
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```
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#### PostgreSQL
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```bash
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# Update config.pgsql.yml with your credentials
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cp config.pgsql.yml config.yml # Or set ENV vars
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go run . -test
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```
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### 2. Run Migration Tests
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```bash
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# Run comprehensive test suite
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go run . -test
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# Or start the server for manual testing
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go run .
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```
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### 3. Expected Output
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```
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🚀 Starting Migration Test Suite
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================================
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📊 Testing Database Detection...
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✅ Database detected: postgresql
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📋 Database info: PostgreSQL 14.2 on database 'testdb'
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📦 Running Migration...
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✅ Migration completed in 245ms
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🔍 Verifying Table Creation...
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✅ Table 'users' exists
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✅ Table 'user_profiles' exists
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✅ Table 'posts' exists
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✅ Table 'comments' exists
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✅ Table 'categories' exists
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✅ Table 'tags' exists
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✅ Table 'post_tags' exists
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✅ Table 'settings' exists
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✅ Table 'logs' exists
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✅ Table 'session_data' exists
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💾 Testing Data Insertion...
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✅ User created with ID: 1
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✅ User profile created with ID: 1
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✅ Category created with ID: 1
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✅ Post created with ID: 1
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✅ Comment created with ID: 1
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🔗 Testing Foreign Key Constraints...
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✅ Foreign key constraint properly enforced
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✅ Valid foreign key accepted
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📈 Testing Indexes...
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✅ Unique index properly enforced on email
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✅ Unique index properly enforced on username
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🎉 All tests passed successfully!
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Migration system is working correctly.
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```
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## Model Examples
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### Basic Model with Constraints
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```go
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type User struct {
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ID uint `gorm:"primaryKey;autoIncrement" json:"id"`
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Email string `gorm:"uniqueIndex;size:255;not null" json:"email"`
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Username string `gorm:"uniqueIndex:idx_username;size:50;not null" json:"username"`
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FirstName string `gorm:"size:100" json:"first_name"`
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LastName string `gorm:"size:100" json:"last_name"`
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Password string `gorm:"size:255;not null" json:"-"`
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IsActive bool `gorm:"default:true;not null" json:"is_active"`
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CreatedAt time.Time `gorm:"autoCreateTime" json:"created_at"`
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UpdatedAt time.Time `gorm:"autoUpdateTime" json:"updated_at"`
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DeletedAt *time.Time `gorm:"index" json:"deleted_at,omitempty"`
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}
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```
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### Foreign Key Relationships
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```go
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type UserProfile struct {
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ID uint `gorm:"primaryKey;autoIncrement" json:"id"`
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UserID uint `gorm:"not null;FK:users.id" json:"user_id"`
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Bio string `gorm:"type:text" json:"bio"`
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DateOfBirth *time.Time `json:"date_of_birth"`
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Country string `gorm:"size:100;default:'US'" json:"country"`
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}
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```
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### Full-Text Search & Enums
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```go
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type Post struct {
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ID uint `gorm:"primaryKey;autoIncrement" json:"id"`
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UserID uint `gorm:"not null;index;FK:users.id" json:"user_id"`
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Title string `gorm:"size:255;not null;FULLTEXT" json:"title"`
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Content string `gorm:"type:text;FULLTEXT" json:"content"`
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Status string `gorm:"type:enum('draft','published','archived');default:'draft';not null" json:"status"`
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PublishedAt *time.Time `gorm:"index" json:"published_at"`
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}
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```
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### Composite Indexes
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```go
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type Comment struct {
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ID uint `gorm:"primaryKey;autoIncrement" json:"id"`
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PostID uint `gorm:"not null;index:idx_post_user,priority:1;FK:posts.id" json:"post_id"`
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UserID uint `gorm:"not null;index:idx_post_user,priority:2;FK:users.id" json:"user_id"`
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ParentID *uint `gorm:"index;FK:comments.id" json:"parent_id"`
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Content string `gorm:"type:text;not null" json:"content"`
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}
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```
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### Custom Table Configuration
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```go
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type Category struct {
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ID uint `gorm:"primaryKey;autoIncrement" json:"id"`
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Name string `gorm:"size:100;not null;uniqueIndex;CHARSET:utf8mb4;COLLATE:utf8mb4_unicode_ci" json:"name"`
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ParentID *uint `gorm:"index;FK:categories.id" json:"parent_id"`
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}
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func (Category) TableEngine() string {
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return "InnoDB"
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}
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func (Category) TableCharset() string {
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return "utf8mb4"
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}
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func (Category) TableCollation() string {
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return "utf8mb4_unicode_ci"
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}
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```
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### Versioned Migrations
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```go
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type Log struct {
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ID uint `gorm:"primaryKey;autoIncrement" json:"id"`
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UserID *uint `gorm:"index;FK:users.id" json:"user_id"`
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Action string `gorm:"size:50;not null;index" json:"action"`
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Resource string `gorm:"size:50;not null;index" json:"resource"`
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Details string `gorm:"type:text" json:"details"`
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CreatedAt time.Time `gorm:"autoCreateTime;index" json:"created_at"`
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}
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func (Log) Migration(currentVersion string) []schema.Migration {
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return []schema.Migration{
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{
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Version: "1.0.0",
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Query: "ALTER TABLE logs ADD COLUMN session_id VARCHAR(255) AFTER user_id",
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},
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{
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Version: "1.1.0",
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Query: "ALTER TABLE logs ADD INDEX idx_session_id (session_id)",
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},
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{
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Version: "1.2.0",
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Query: "ALTER TABLE logs ADD COLUMN metadata JSON AFTER details",
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},
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}
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}
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```
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### Junction Tables (Many-to-Many)
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```go
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type PostTag struct {
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PostID uint `gorm:"primaryKey;FK:posts.id" json:"post_id"`
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TagID uint `gorm:"primaryKey;FK:tags.id" json:"tag_id"`
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}
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```
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## Configuration Files
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### SQLite (config.sqlite.yml)
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```yaml
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Database:
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Enabled: true
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Type: sqlite
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Server: "./database.sqlite"
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Debug: 3
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```
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### MySQL (config.mysql.yml)
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```yaml
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Database:
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Enabled: true
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Type: mysql
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Server: "localhost:3306"
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Database: "evo_test"
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Username: "root"
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Password: "password"
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Debug: 3
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```
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### PostgreSQL (config.pgsql.yml)
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```yaml
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Database:
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Enabled: true
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Type: postgres
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Server: "localhost:5432"
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Database: "evo_test"
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Username: "postgres"
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Password: "password"
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Debug: 3
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```
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## Testing Different Scenarios
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### 1. Fresh Database Migration
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```bash
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# Delete existing database/tables
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rm database.sqlite # For SQLite
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# Or DROP DATABASE for MySQL/PostgreSQL
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# Run migration
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go run . -test
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```
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### 2. Schema Updates
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```bash
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# Modify models in models.go
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# Add new fields, indexes, or constraints
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# Run migration again
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go run . -test
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```
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### 3. Data Type Changes
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```bash
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# Change field types in models
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# Test type conversion and compatibility
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go run . -test
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```
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### 4. Foreign Key Testing
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```bash
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# Test constraint enforcement
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# Verify cascade operations
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go run . -test
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```
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## Debugging
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### Enable SQL Logging
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```yaml
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Database:
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Debug: 4 # Shows all SQL queries
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```
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### Manual Database Inspection
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#### SQLite
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```bash
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sqlite3 database.sqlite
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.tables
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.schema users
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```
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#### MySQL
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```sql
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USE evo_test;
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SHOW TABLES;
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DESCRIBE users;
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SHOW CREATE TABLE posts;
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```
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#### PostgreSQL
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```sql
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\c evo_test
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\dt
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\d users
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\d+ posts
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```
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## Known Limitations
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### SQLite
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- No ENUM support (converted to TEXT)
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- No JSON support (stored as TEXT)
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- Limited ALTER TABLE support
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- No column comments
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- Foreign keys need to be enabled with `PRAGMA foreign_keys=ON`
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### PostgreSQL
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- ENUM types converted to VARCHAR(255)
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- Different syntax for indexes and constraints
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- No table-level charset/collation
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- Different auto-increment mechanism (SERIAL)
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### MariaDB
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- JSON stored as LONGTEXT
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- Some MySQL features may not be available
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## Troubleshooting
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### Common Issues
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1. **Connection Errors**
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- Verify database credentials
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- Ensure database server is running
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- Check network connectivity
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2. **Migration Fails**
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- Check database permissions
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- Verify foreign key references exist
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- Review constraint conflicts
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3. **Type Conversion Errors**
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- Some types may need manual conversion
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- Check database-specific limitations
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4. **Performance Issues**
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- Large tables may slow migration
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- Consider adding indexes after data migration
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## Contributing
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When adding new models or features:
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1. Add the model to `models.go`
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2. Register it in the `init()` function
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3. Add corresponding tests in `test_migration.go`
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4. Update this documentation
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5. Test with all supported databases
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## Performance Benchmarks
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Migration times for the complete test suite:
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| Database | Tables | Indexes | Time |
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|----------|--------|---------|------|
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| SQLite | 10 | 15 | ~100ms |
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| MySQL | 10 | 15 | ~200ms |
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| PostgreSQL | 10 | 15 | ~250ms |
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| MariaDB | 10 | 15 | ~220ms |
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*Times may vary based on system performance and database configuration.*

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