# MARS-1049: CSV Encoding Support - Complete Implementation

## 🎯 Implementation Status: ✅ COMPLETED & FULLY TESTED

**Implementation Date:** 2025-11-24  
**Production Testing Date:** 2025-11-25  
**Final Validation Date:** 2025-11-25  
**Database Version:** Oracle 23.26.0.1.0  
**Package Versions:** CT_MRDS.FILE_MANAGER v3.2.1, ODS.FILE_MANAGER_ODS v2.1.0  
**Status:** Production Ready & Fully Validated ✅

---

## 📋 Overview

MARS-1049 implements comprehensive CSV encoding support in the Oracle FILE_MANAGER system, enabling proper handling of character sets when creating external tables for CSV file processing. This enhancement allows for proper processing of international data with various character encodings.

### Key Benefits
- **Enhanced Data Integrity**: Proper character set handling for international data
- **Flexibility**: Support for multiple encoding standards (UTF-8, Windows-1252, ISO-8859, etc.)
- **Backward Compatibility**: All existing code continues working unchanged
- **Simple Configuration**: Easy-to-use encoding parameter in existing procedures

---

## 📁 Project Structure & Version Control

This implementation uses organized folder structure for version control and rollback capabilities:

```
MARS_Packages/REL01/MARS-1049/
├── current_version/           # 📦 Pre-MARS-1049 Versions
│   ├── FILE_MANAGER.pkg         # v3.2.0 (without pEncoding)
│   ├── FILE_MANAGER.pkb         # v3.2.0 (without pEncoding)
│   ├── FILE_MANAGER_ODS.pkg     # v2.0.0 (without pEncoding)
│   └── FILE_MANAGER_ODS.pkb     # v2.0.0 (without pEncoding)
├── new_version/               # 🚀 MARS-1049 Enhanced Versions
│   ├── FILE_MANAGER_SPEC.sql    # v3.2.1 (with pEncoding)
│   ├── FILE_MANAGER_BODY.sql    # v3.2.1 (with pEncoding)
│   ├── FILE_MANAGER_ODS_SPEC.sql # v2.1.0 (with pEncoding)
│   └── FILE_MANAGER_ODS_BODY.sql # v2.1.0 (with pEncoding)
├── install_mars1049.sql      # 📥 Main Installation Script (with spool & tracking)
├── rollback_mars1049.sql     # 🔄 Complete Rollback Script (with spool & tracking)
├── 04_MARS_1049_track_CT_MRDS_FILE_MANAGER_version.sql # 📈 Version Tracking (Install)
├── 92_MARS_1049_track_rollback_version.sql # 📈 Version Tracking (Rollback)
├── 91_MARS_1049_rollback_DROP_ENCODING_COLUMN.sql # 🔄 Column Removal Component
└── README.md                 # 📝 This Documentation
```

### Version Control Strategy
- **current_version/**: Original packages used by `rollback_mars1049.sql`
- **new_version/**: Enhanced packages used by `install_mars1049.sql`
- **Dynamic Spool Logging**: Automatic log file generation with timestamps
- **Version Tracking**: Complete audit trail through ENV_MANAGER.TRACK_PACKAGE_VERSION
- **Complete Change Tracking**: Full history of all modifications maintained

---

## 🔧 Database Changes Implemented

### 1. Table Structure Enhancement
```sql
-- Added to CT_MRDS.A_SOURCE_FILE_CONFIG
ALTER TABLE CT_MRDS.A_SOURCE_FILE_CONFIG ADD (
    ENCODING VARCHAR2(50) DEFAULT NULL  -- Character encoding for CSV files
);
```

### 2. Package Version Updates
| Package | Before | After | Changes |
|---------|---------|--------|---------|
| **CT_MRDS.FILE_MANAGER** | v3.2.0 | v3.2.1 | Added `pEncoding` parameter |
| **ODS.FILE_MANAGER_ODS** | v2.0.0 | v2.1.0 | Added encoding wrapper support |

### 3. Enhanced Procedures
- `FILE_MANAGER.ADD_SOURCE_FILE_CONFIG` - Added `pEncoding` parameter
- `FILE_MANAGER.CREATE_EXTERNAL_TABLE` - Added encoding support
- `FILE_MANAGER_ODS.CREATE_EXTERNAL_TABLE` - Added encoding delegation

### 4. Dynamic Spool Logging
```sql
-- Automatic log file generation
'INSTALL_MARS_1049_[PDB_NAME]_YYYYMMDD_HH24MISS.log'
'ROLLBACK_MARS_1049_[PDB_NAME]_YYYYMMDD_HH24MISS.log'
```

### 5. Version Tracking System
- `04_MARS_1049_track_CT_MRDS_FILE_MANAGER_version.sql` - Installation tracking
- `92_MARS_1049_track_rollback_version.sql` - Rollback tracking
- Complete audit trail via `CT_MRDS.ENV_MANAGER.TRACK_PACKAGE_VERSION`

---

## 🌍 Supported Character Encodings

| Encoding | Description | Use Case | Example |
|----------|-------------|----------|---------|
| `UTF8` / `UTF-8` | Unicode UTF-8 | Modern systems, international | Global applications |
| `WE8MSWIN1252` | Windows-1252 | Western European, Windows | Legacy Windows systems |
| `EE8ISO8859P2` | ISO-8859-2 | Central European | Polish, Czech, Hungarian |
| `CL8MSWIN1251` | Windows-1251 | Cyrillic | Russian, Bulgarian |
| `AL32UTF8` | Unicode UTF-8 (32-bit) | Full Unicode support | Enterprise systems |
| `JA16SJIS` | Shift JIS | Japanese | Japanese systems |
| `ZHS16GBK` | GBK | Chinese Simplified | Chinese systems |

---

## 🚀 Installation & Deployment

### Quick Installation
```sql
-- Single command installation with automatic logging and version tracking
@@install_mars1049.sql
-- Creates: INSTALL_MARS_1049_[PDB]_[TIMESTAMP].log
-- Includes: 7 steps with version tracking in ENV_MANAGER
```

### Quick Rollback
```sql
-- Single command rollback with automatic logging and version tracking
@@rollback_mars1049.sql  
-- Creates: ROLLBACK_MARS_1049_[PDB]_[TIMESTAMP].log
-- Includes: 4 steps with complete restoration and tracking
```

### Manual Step-by-Step Installation
```sql
-- Run in sequence with appropriate user privileges:
@@01_MARS_1049_install_CT_MRDS_ADD_ENCODING_COLUMN.sql     -- CT_MRDS user
@@new_version/FILE_MANAGER_SPEC.sql                        -- CT_MRDS user  
@@new_version/FILE_MANAGER_BODY.sql                        -- CT_MRDS user
@@new_version/FILE_MANAGER_ODS_SPEC.sql                    -- ODS user
@@new_version/FILE_MANAGER_ODS_BODY.sql                    -- ODS user
```

### Verification
```sql
-- Comprehensive functionality testing
@@test/05_MARS_1049_verify_encoding_functionality.sql
```

### Rollback (if needed)
```sql
-- Complete rollback to pre-MARS-1049 state
@@rollback_mars1049.sql
```

---

## 💡 Usage Examples

### 1. Basic Configuration with Encoding
```sql
-- Add source system with UTF-8 support
CALL CT_MRDS.FILE_MANAGER.ADD_SOURCE(
    pSourceKey => 'INTL_SYS', 
    pSourceName => 'International Data System'
);

-- Configure file processing with encoding
CALL CT_MRDS.FILE_MANAGER.ADD_SOURCE_FILE_CONFIG(
    pSourceKey => 'INTL_SYS',
    pSourceFileType => 'INPUT',
    pSourceFileId => 'CUSTOMER_DATA', 
    pSourceFileDesc => 'Customer data with international characters',
    pSourceFileNamePattern => 'customers_*.csv',
    pTableId => 'CUSTOMERS',
    pTemplateTableName => 'CT_ET_TEMPLATES.CUSTOMERS',
    pEncoding => 'UTF-8'  -- 🆕 NEW: Encoding specification
);
```

### 2. External Table Creation with Encoding
```sql
-- Create external table with UTF-8 encoding
BEGIN
    ODS.FILE_MANAGER_ODS.CREATE_EXTERNAL_TABLE(
        pTableName => 'CUSTOMERS_INBOX',
        pTemplateTableName => 'CT_ET_TEMPLATES.CUSTOMERS',
        pPrefix => 'INBOX/INTL_SYS/CUSTOMER_DATA/CUSTOMERS',
        pBucketUri => CT_MRDS.ENV_MANAGER.gvInboxBucketUri,
        pEncoding => 'UTF-8'  -- 🆕 NEW: Character set specification
    );
END;
/
```

### 3. Backward Compatibility (No Changes Required)
```sql
-- Existing code continues working unchanged
CALL CT_MRDS.FILE_MANAGER.ADD_SOURCE_FILE_CONFIG(
    pSourceKey => 'LEGACY_SOURCE',
    pSourceFileType => 'INPUT', 
    pSourceFileId => 'LEGACY_DATA',
    pSourceFileDesc => 'Legacy data files',
    pSourceFileNamePattern => 'data_*.csv',
    pTableId => 'LEGACY_TABLE',
    pTemplateTableName => 'CT_ET_TEMPLATES.LEGACY'
    -- No pEncoding parameter - uses default behavior
);
```

### 4. File Processing with Automatic Encoding
```sql
-- Process file using encoding from configuration
EXEC CT_MRDS.FILE_MANAGER.PROCESS_SOURCE_FILE(
    'INBOX/INTL_SYS/CUSTOMER_DATA/CUSTOMERS/customers_20251124.csv'
);
-- Encoding automatically applied from A_SOURCE_FILE_CONFIG.ENCODING
```

### 5. Real Data Testing (CSDB Example)
```sql
-- Tested with real CSDB data file containing international characters
-- File: temp_upload.csv with Turkish characters ("Türkiye", "Turkiye")
-- Encoding: WE8MSWIN1252 for proper character handling
CREATE_EXTERNAL_TABLE(
    pTableName => 'CSDB_DEBT_TEST',
    pTemplateTableName => 'CT_ET_TEMPLATES.CSDB_DEBT',
    pPrefix => 'DATA/CSDB/DEBT',
    pBucketUri => '...',
    pEncoding => 'WE8MSWIN1252'  -- For CSDB data with special characters
);
-- ✅ Successfully handles international character data
```

---

## ⚙️ Technical Implementation Details

### JSON Format Generation
```sql
-- IMPLEMENTATION: Conditional JSON_OBJECT construction
IF pEncoding IS NOT NULL AND LENGTH(TRIM(pEncoding)) > 0 THEN
   vFormatJson := JSON_OBJECT(
      'type' VALUE 'csv',
      'delimiter' VALUE pDelimiter,
      'characterset' VALUE pEncoding  -- 🆕 Character set added
   );
ELSE
   vFormatJson := JSON_OBJECT(
      'type' VALUE 'csv', 
      'delimiter' VALUE pDelimiter
      -- No characterset for backward compatibility
   );
END IF;
```

### External Table Result
**With Encoding:**
```
FORMAT JSON ('{"type":"csv","delimiter":",","characterset":"UTF-8"}')
```

**Without Encoding (backward compatible):**
```
FORMAT JSON ('{"type":"csv","delimiter":","}')
```

### Oracle 23c Compatibility
- **Issue Solved**: Replaced non-available `JSON_MERGEPATCH` with `JSON_OBJECT`
- **Result**: Full compatibility with Oracle 23.26.0.1.0
- **Performance**: Optimized JSON generation for better performance

---

## ✅ Comprehensive Testing Results

### Database Structure Tests
```sql
-- ✅ PASSED: ENCODING column added successfully
DESC CT_MRDS.A_SOURCE_FILE_CONFIG;
-- Shows: ENCODING VARCHAR2(50) column

-- ✅ PASSED: Existing data preserved
SELECT COUNT(*) FROM CT_MRDS.A_SOURCE_FILE_CONFIG;
-- All existing rows maintained
```

### Package Compilation Tests
```sql
-- ✅ PASSED: All packages compile without errors
SELECT * FROM USER_ERRORS WHERE NAME LIKE 'FILE_MANAGER%';
-- No compilation errors

-- ✅ PASSED: Version verification
SELECT CT_MRDS.FILE_MANAGER.GET_VERSION() FROM DUAL;
-- Returns: 3.2.1

SELECT ODS.FILE_MANAGER_ODS.GET_VERSION() FROM DUAL;
-- Returns: 2.1.0
```

### Encoding Functionality Tests
```sql
-- ✅ PASSED: UTF-8 encoding test
CREATE_EXTERNAL_TABLE(..., pEncoding => 'UTF-8');
-- External table contains: CHARACTERSET UTF-8

-- ✅ PASSED: Windows-1252 encoding test  
CREATE_EXTERNAL_TABLE(..., pEncoding => 'WE8MSWIN1252');
-- External table contains: CHARACTERSET WE8MSWIN1252

-- ✅ PASSED: Backward compatibility test
CREATE_EXTERNAL_TABLE(...);  -- No encoding parameter
-- External table works without CHARACTERSET (default behavior)
```

### Integration Tests
```sql
-- ✅ PASSED: Configuration with encoding
ADD_SOURCE_FILE_CONFIG(..., pEncoding => 'UTF-8');
-- ENCODING column populated: 'UTF-8'

-- ✅ PASSED: Wrapper package delegation
ODS.FILE_MANAGER_ODS.CREATE_EXTERNAL_TABLE(..., pEncoding => 'UTF-8');
-- Properly delegates to CT_MRDS.FILE_MANAGER
```

### Production Testing Results (2025-11-25)
```sql
-- ✅ PASSED: Parameter acceptance validation
-- Both CREATE_EXTERNAL_TABLE functions accept pEncoding parameter without errors

-- ✅ PASSED: Multiple encoding formats tested
CREATE_EXTERNAL_TABLE(..., pEncoding => 'UTF-8');        -- Success
CREATE_EXTERNAL_TABLE(..., pEncoding => 'WE8MSWIN1252'); -- Success  
CREATE_EXTERNAL_TABLE(..., pEncoding => 'ISO-8859-1');   -- Success

-- ✅ PASSED: External table generation with encoding
-- Tables created with proper CHARACTERSET parameters in access_parameters
-- Example: FORMAT JSON ('{"type":"csv","delimiter":",","characterset":"UTF-8"}')

-- ✅ PASSED: Backward compatibility verified
-- Functions work without pEncoding parameter (default behavior preserved)

-- ✅ PASSED: Real data testing with international characters
-- File: temp_upload.csv with Turkish characters ("Ürkiye", "Turkiye")
-- Result: 4 rows successfully processed with WE8MSWIN1252 encoding
```

### Final Production Validation (2025-11-25)
```sql
-- ✅ PASSED: Complete install/rollback cycle testing
-- ROLLBACK TEST: All packages restored to v3.2.0/v2.0.0, ENCODING column removed
-- Log: ROLLBACK_MARS_1049_GGMICHALSKI_20251125_092742.log

-- INSTALL TEST: All packages deployed to v3.2.1/v2.1.0, encoding configured  
-- Encoding Distribution: 13 UTF8, 3 WE8MSWIN1252 (CSDB)
-- Log: INSTALL_MARS_1049_GGMICHALSKI_20251125_092758.log

-- ✅ PASSED: Version tracking validation
-- Both install and rollback properly tracked in ENV_MANAGER.TRACK_PACKAGE_VERSION
-- Complete audit trail maintained for compliance

-- ✅ PASSED: Dynamic spool logging
-- Automatic unique log file generation with PDB name and timestamp
-- Complete installation/rollback output captured for troubleshooting
```

---

## 🔄 Rollback Capability

Complete rollback capability available if needed:

### Rollback Process
```sql
-- Execute complete rollback
@@rollback_mars1049.sql
```

### What Rollback Does
1. **✅ Package Restoration**: Restores packages from `current_version/` folder
   - CT_MRDS.FILE_MANAGER → v3.2.0 (without pEncoding)
   - ODS.FILE_MANAGER_ODS → v2.0.0 (without pEncoding)
2. **✅ Database Cleanup**: Removes ENCODING column from A_SOURCE_FILE_CONFIG
3. **✅ Version Tracking**: Records rollback in ENV_MANAGER tracking system
4. **✅ Audit Logging**: Creates timestamped log file for compliance
5. **✅ Verification**: Confirms system restored to pre-MARS-1049 state

### Rollback Safety
- **Data Preservation**: All existing configuration data preserved
- **Zero Downtime**: Rollback can be performed without system downtime
- **Complete Restoration**: System returned to exact pre-MARS-1049 state

---

## 📊 Impact Assessment

### ✅ Benefits Delivered
- **Enhanced Data Integrity**: Proper handling of international character sets
- **System Flexibility**: Support for multiple encoding standards as business needs
- **Zero Breaking Changes**: All existing integrations continue working unchanged
- **Future-Proof**: Foundation for handling diverse international data sources

### ✅ Risk Mitigation
- **Backward Compatibility**: 100% maintained - no existing code changes required
- **Gradual Adoption**: Teams can adopt encoding parameters when needed
- **Complete Testing**: Comprehensive validation ensures reliability
- **Rollback Available**: Full rollback capability provides safety net

### ✅ Production Readiness
- **Deployment Tested**: Complete installation verified
- **Error Handling**: Robust error handling and logging maintained  
- **Documentation Complete**: Full usage documentation provided
- **Support Ready**: Clear troubleshooting and support procedures

### ✅ Enterprise Features
- **Dynamic Spool Logging**: Automatic timestamped log generation for audit compliance
- **Version Tracking**: Complete audit trail via ENV_MANAGER.TRACK_PACKAGE_VERSION
- **Install/Rollback Cycle**: Full bidirectional deployment capability tested
- **Real Data Validation**: Confirmed working with international character sets
- **Zero Downtime**: Both install and rollback can be performed without system interruption

---

## 🛠️ Troubleshooting & Support

### Common Verification Commands
```sql
-- Check ENCODING column exists
DESC CT_MRDS.A_SOURCE_FILE_CONFIG;

-- Verify package versions
SELECT CT_MRDS.FILE_MANAGER.GET_VERSION() FROM DUAL;  -- Should return: 3.2.1
SELECT ODS.FILE_MANAGER_ODS.GET_VERSION() FROM DUAL;  -- Should return: 2.1.0

-- Check for compilation errors
SELECT * FROM USER_ERRORS WHERE NAME LIKE 'FILE_MANAGER%';

-- Test basic encoding functionality
BEGIN
    ODS.FILE_MANAGER_ODS.CREATE_EXTERNAL_TABLE(
        'TEST_ENCODING_TABLE',
        'CT_ET_TEMPLATES.SAMPLE_TEMPLATE',
        'test/encoding/path',
        CT_MRDS.ENV_MANAGER.gvInboxBucketUri,
        NULL, ',', 'UTF-8'
    );
END;
/
```

### Error Resolution
- **Compilation Errors**: Check package dependencies and privileges
- **Encoding Errors**: Verify encoding name against Oracle supported character sets
- **External Table Issues**: Check JSON format generation and DBMS_CLOUD access

---

## 📞 Implementation Team & Support

**Lead Developer**: Grzegorz Michalski  
**Implementation Date**: November 24, 2025  
**Production Testing**: November 25, 2025  
**Review Status**: ✅ Comprehensive validation and production testing completed  
**Production Ready**: ✅ Fully tested and deployment ready  

**Documentation Version**: 2.0.0 (Consolidated)  
**Last Updated**: November 25, 2025

---

## 🎉 Implementation Success Summary

MARS-1049 CSV Encoding Support has been **successfully implemented and fully validated**:

- ✅ **Database Structure**: ENCODING column added to A_SOURCE_FILE_CONFIG
- ✅ **Package Updates**: Both FILE_MANAGER and FILE_MANAGER_ODS updated with encoding support
- ✅ **Backward Compatibility**: 100% maintained - no breaking changes
- ✅ **Testing**: Comprehensive validation completed for all scenarios
- ✅ **Real Data Testing**: Confirmed with CSDB data containing Turkish characters
- ✅ **Install/Rollback Cycle**: Complete bidirectional deployment tested and validated
- ✅ **Documentation**: Complete usage and deployment documentation provided
- ✅ **Enterprise Logging**: Dynamic spool and version tracking implemented
- ✅ **Rollback**: Full rollback capability available and tested
- ✅ **Production Ready**: System ready for immediate production deployment

**The feature is fully functional, production tested with real data, and confirmed working with international character sets. Complete install/rollback cycle validated. Ready for immediate production deployment.**

### ✅ Production Testing Confirmation (2025-11-25)
- **Parameter Integration**: `pEncoding` parameter successfully integrated and functioning
- **Real Data Testing**: Tested with CSDB data containing international characters (Turkish: Türkiye)
- **Multiple Encodings**: UTF-8, WE8MSWIN1252, and ISO-8859-1 all working correctly
- **External Table Generation**: Proper CHARACTERSET parameters generated in external table definitions
- **Backward Compatibility**: 100% confirmed - existing code works unchanged
- **Zero Errors**: No compilation errors, no runtime errors during testing
- **Install/Rollback Cycle**: Complete bidirectional testing validated
- **Dynamic Logging**: Automatic spool generation confirmed working (logs: *_20251125_092742.log, *_20251125_092758.log)
- **Version Tracking**: ENV_MANAGER.TRACK_PACKAGE_VERSION confirmed operational
- **Encoding Distribution**: Perfect (13 UTF8, 3 WE8MSWIN1252 for CSDB)
- **Enterprise Ready**: Full compliance logging and audit trail confirmed