Complete application patterns and use cases demonstrating PDOdb in realistic scenarios.
These examples show how to build complete features using PDOdb, combining multiple concepts from basic to advanced levels. Each example is a mini-application that demonstrates best practices and real-world patterns.
Complete blog system with posts, comments, and tags.
Features implemented:
- Multi-table schema (posts, comments, tags, post_tags)
- Creating posts with tags
- Adding comments to posts
- Querying posts with related data
- JOINs across multiple tables
- Aggregations (comment counts, tag usage)
- Filtering by tags and authors
- Pagination of results
- Full-text search in posts
Concepts used:
- Complex JOINs
- Many-to-many relationships
- GROUP BY with HAVING
- Subqueries
- Aggregate functions
- Conditional logic
User authentication and authorization system.
Features implemented:
- User registration with password hashing
- User login with credential verification
- Role-based access control (RBAC)
- Session management
- Password updates
- User profile management
- Permission checking
- Account status tracking
Concepts used:
- Secure password handling
- WHERE conditions
- UPDATEs with conditions
- JOINs for roles and permissions
- Transactions for data consistency
- NULL handling
Advanced search with multiple filter options.
Features implemented:
- Product catalog search
- Multiple filter criteria (category, price range, rating)
- Dynamic query building
- Sorting options
- Pagination of results
- Filter combination logic
- Search result highlighting
- Filter counts and statistics
Concepts used:
- Dynamic WHERE building
- BETWEEN for ranges
- IN for multiple values
- LIKE for text search
- Complex boolean logic
- ORDER BY with multiple columns
- COUNT aggregations
Multi-tenant architecture with tenant isolation.
Features implemented:
- Tenant registration and management
- Tenant-specific data isolation
- Automatic tenant ID filtering
- Cross-tenant reporting (admin only)
- Tenant switching
- Tenant-specific configuration
- Data access control
- Tenant activity tracking
Concepts used:
- Global WHERE filters
- Transactions for tenant operations
- Complex JOINs with tenant context
- Subqueries for cross-tenant data
- Aggregate functions per tenant
- Security best practices
php 01-blog-system.phpPDODB_DRIVER=mysql php 01-blog-system.phpPDODB_DRIVER=pgsql php 01-blog-system.php- Proper normalization
- Foreign key relationships
- Many-to-many tables
- Indexes for performance
- Efficient JOINs
- Strategic use of indexes
- Query result limiting
- Subquery vs JOIN decisions
- SQL injection prevention (automatic with parameter binding)
- Password hashing
- Access control
- Input validation
- Transaction usage
- Constraint handling
- Error recovery
- Atomic operations
- Separation of concerns
- Reusable query patterns
- Error handling
- Clean code practices
These examples provide templates for common application types:
- Blog/CMS: Start with
01-blog-system.php - User Management: Start with
02-user-auth.php - E-commerce/Catalog: Start with
03-search-filters.php - SaaS Platform: Start with
04-multi-tenant.php
- Always use transactions for multi-table operations
- Filter results early with WHERE clauses
- Use JOINs efficiently - avoid N+1 queries
- Implement pagination for large result sets
- Index frequently queried columns
- Use helper functions for dialect compatibility
- Handle errors gracefully with try-catch
- Validate input before queries
Apply these patterns in your projects:
- Exception Handling - Robust error handling
- Batch Processing - Large dataset processing
- Full Documentation - Complete API reference