# QGIS Data Loader Plugin

A professional-grade QGIS plugin for transferring features between vector layers with intelligent field mapping, comprehensive validation, and detailed logging.

## Features

### 🎯 Smart Field Mapping
- Automatic field type compatibility checking
- Intelligent field name matching
- Support for numeric type conversions
- Any-to-string field conversion capability

### ✅ Comprehensive Validation
- Input validation before processing
- Geometry type compatibility checking
- Coordinate reference system validation
- Layer editability verification
- Feature count warnings for large datasets

### 📊 Enhanced Logging
- Color-coded log messages (INFO, WARNING, ERROR, SUCCESS, PROGRESS)
- Timestamp-based logging
- Real-time progress updates
- Log export functionality
- Auto-scrolling log display

### 🛡️ Robust Error Handling
- Transaction-based operations
- Automatic rollback on errors
- Comprehensive error reporting
- Data integrity protection

### 💡 Professional UI
- Detailed tooltips for all elements
- Contextual help and guidance
- Comprehensive user documentation
- Side panel with usage instructions

## Installation

1. Download the plugin zip file
2. In QGIS, go to **Plugins** → **Manage and Install Plugins**
3. Click **Install from ZIP** and select the downloaded file
4. Enable the plugin in the **Installed** tab

## Usage

### Quick Start
1. Load both source and target vector layers in your QGIS project
2. Click the Data Loader icon in the toolbar
3. Select your target (destination) and source layers
4. Configure field mappings in the table
5. Click OK to start the transfer process

### Field Mapping Rules
- **Automatic Matching**: Fields with identical names are pre-selected
- **Type Compatibility**: Only compatible field types are shown in dropdowns
- **Numeric Conversion**: Different numeric types can be mapped to each other
- **String Conversion**: Any field type can be converted to string
- **Unmapped Fields**: Will use default values or remain empty
### 📊 Supported Vector Data Sources

The Data Loader plugin works with **any vector data source supported by QGIS**, providing maximum flexibility for your data transfer needs:

#### 🗂️ File Formats
- **Shapefile** (.shp) - ESRI's standard vector format
- **GeoPackage** (.gpkg) - OGC standard SQLite-based format
- **GeoJSON** (.geojson) - Web-friendly JSON format
- **KML/KMZ** (.kml/.kmz) - Google Earth format
- **CSV with geometry** - Comma-separated values with spatial data
- **GPX** (.gpx) - GPS exchange format
- **DXF** (.dxf) - AutoCAD drawing format
- **MapInfo** (.tab) - MapInfo native format

#### 🗄️ Database Sources
- **PostGIS** - PostgreSQL spatial extension (full support)
- **SpatiaLite** - SQLite spatial extension
- **Oracle Spatial** - Oracle's spatial database
- **SQL Server** - Microsoft SQL Server with spatial features
- **MySQL** - MySQL with spatial capabilities

#### 🌐 Web Services
- **WFS** (Web Feature Service) - OGC standard web service
- **ArcGIS Feature Services** - ESRI's web-based feature services
- **GeoNode** - Open source geospatial content management

#### 💾 Memory and Virtual Layers
- **Memory Layers** - Temporary layers stored in RAM
- **Scratch Layers** - Temporary layers for processing
- **Virtual Layers** - SQL-based virtual layers combining multiple sources

### 🗄️ PostGIS Support Details

**✅ Full PostGIS Compatibility** - The plugin provides comprehensive support for PostGIS layers:

#### Core PostGIS Features
- **Direct Table Access** - Work directly with PostGIS tables
- **Views and Materialized Views** - Support for database views
- **Complex Geometry Types** - All PostGIS geometry types supported
- **Spatial Indexes** - Efficient processing with spatial indexes
- **Large Datasets** - Optimized for large PostGIS datasets
- **Cross-Database Transfers** - Transfer between PostGIS and other formats

#### PostGIS-Specific Advantages
- **Transaction Safety** - Database-level transaction support
- **Concurrent Access** - Multi-user database environment support
- **Data Integrity** - PostgreSQL's ACID compliance
- **Performance** - Leverages PostGIS spatial indexes and optimizations
- **Scalability** - Handle enterprise-scale datasets efficiently

#### PostGIS Connection Types
- **Direct Database Connection** - Connect via QGIS database manager
- **Service Connections** - Use PostgreSQL service files
- **SSL Connections** - Secure encrypted connections
- **Connection Pooling** - Efficient connection management
## Best Practices

### Before You Start
- **Backup**: Always backup your target layer before large operations
- **Testing**: Test with a small subset first for large datasets
- **Projections**: Verify both layers use compatible coordinate systems
- **Permissions**: Ensure you have write access to the target layer

### Performance Tips
- For datasets >10,000 features, consider processing in batches
- Close unnecessary applications to free up memory
- Monitor the log for progress updates and potential issues
- Use consistent field naming for automatic mapping

## Troubleshooting

### Common Issues
- **No layers visible**: Ensure vector layers are loaded in the project
- **Geometry errors**: Check that geometry types are compatible
- **Field mapping issues**: Verify field types are compatible
- **Permission errors**: Ensure target layer is editable

### Log Messages
- 🔵 **PROGRESS**: Operation progress updates
- 🟢 **SUCCESS**: Successful completion messages  
- 🟠 **WARNING**: Non-critical issues requiring attention
- 🔴 **ERROR**: Critical errors requiring immediate action

## Technical Requirements

- QGIS 3.0 or higher
- PyQt5
- Write permissions for target layers

## Support

For issues, feature requests, or contributions:
- GitHub Issues: [Report a bug or request a feature]
- Email: rawan@example.com

## License

This plugin is released under the GNU General Public License v3.0.

## Changelog

### Version 1.0.0
- Initial release with comprehensive feature set
- Smart field mapping with automatic compatibility checking
- Enhanced logging system with color-coded messages
- Professional UI with detailed tooltips and help
- Transaction-based operations with rollback capability
- Comprehensive input validation and error handling

