seaweedfs/ENHANCED_CLI_FEATURES.md

SeaweedFS Enhanced SQL CLI Features

🚀 ENHANCED CLI EXPERIENCE IMPLEMENTED!

✅ NEW EXECUTION MODES

Interactive Mode (Enhanced)

weed sql --interactive
# or
weed sql  # defaults to interactive if no other options

Features:

• 🎯 Database context switching: USE database_name;
• 🔄 Output format switching: \format table|json|csv
• 📝 Command history (basic implementation)
• 🌟 Enhanced prompts with current database context
• ✨ Improved help with advanced WHERE operator examples

Single Query Mode

weed sql --query "SHOW DATABASES" --output json
weed sql --database analytics --query "SELECT COUNT(*) FROM metrics"

Batch File Processing

weed sql --file queries.sql --output csv
weed sql --file batch_queries.sql --output json

✅ MULTIPLE OUTPUT FORMATS

Table Format (ASCII)

weed sql --query "SHOW DATABASES" --output table

+-----------+
| Database  |
+-----------+
| analytics |
| user_data |
+-----------+

JSON Format

weed sql --query "SHOW DATABASES" --output json

{
  "columns": ["Database"],
  "count": 2,
  "rows": [
    {"Database": "analytics"},
    {"Database": "user_data"}
  ]
}

CSV Format

weed sql --query "SHOW DATABASES" --output csv

Database
analytics
user_data

✅ SMART FORMAT AUTO-DETECTION

• Interactive mode: Defaults to table format for readability
• Non-interactive mode: Defaults to json format for programmatic use
• Override with --output flag: Always respected

✅ DATABASE CONTEXT SWITCHING

Command Line Context

weed sql --database analytics --interactive
# Starts with analytics database pre-selected

Interactive Context Switching

seaweedfs> USE analytics;
Database changed to: analytics

seaweedfs:analytics> SHOW TABLES;
-- Shows tables in analytics database

✅ COMPREHENSIVE HELP SYSTEM

Enhanced Help Command

seaweedfs> help;

Shows:

• 📊 Metadata Operations: SHOW, DESCRIBE commands
• 🔍 Advanced Querying: Full WHERE clause support
• 📝 DDL Operations: CREATE, DROP TABLE
• ⚙️ Special Commands: USE, \format, help, exit
• 🎯 Extended WHERE Operators: All supported operators with examples
• 💡 Real Examples: Practical query demonstrations

✅ ADVANCED WHERE CLAUSE SUPPORT

All implemented and working in CLI:

-- Comparison operators
SELECT * FROM events WHERE user_id <= 100;
SELECT * FROM events WHERE timestamp >= '2023-01-01';

-- Not equal operators  
SELECT * FROM events WHERE status != 'deleted';
SELECT * FROM events WHERE status <> 'inactive';

-- Pattern matching
SELECT * FROM events WHERE username LIKE 'admin%';
SELECT * FROM events WHERE email LIKE '%@company.com';

-- Multi-value matching
SELECT * FROM events WHERE status IN ('active', 'pending', 'verified');
SELECT * FROM events WHERE user_id IN (1, 5, 10, 25);

-- Complex combinations
SELECT * FROM events 
WHERE user_id >= 10 
  AND status != 'deleted' 
  AND username LIKE 'test%'
  AND user_type IN ('premium', 'enterprise');

🛠️ COMMAND LINE INTERFACE

Complete Flag Reference

weed sql [flags]

FLAGS:
  -server string         SeaweedFS server address (default "localhost:8888")
  -interactive          Start interactive shell mode
  -file string          Execute SQL queries from file
  -output string        Output format: table, json, csv (auto-detected if not specified)
  -database string      Default database context
  -query string         Execute single SQL query
  -help                 Show help message

Usage Examples

# Interactive shell
weed sql --interactive
weed sql --database analytics --interactive

# Single query execution
weed sql --query "SHOW DATABASES" --output json
weed sql --query "SELECT * FROM user_events WHERE user_id <= 100" --output table

# Batch processing
weed sql --file queries.sql --output csv
weed sql --file analytics_queries.sql --output json

# Context switching
weed sql --database analytics --query "SHOW TABLES"
weed sql --server broker1:8888 --interactive

📊 PRODUCTION READY FEATURES

✅ Error Handling

• JSON Error Format: Structured error responses for programmatic use
• User-Friendly Errors: Clear error messages for interactive use
• Query Validation: Comprehensive SQL parsing error reporting

✅ Performance Features

• Execution Timing: Query performance metrics in table mode
• Streaming Results: Efficient handling of large result sets
• Timeout Protection: 30-second query timeout with graceful handling

✅ Integration Features

• Real MQ Discovery: Dynamic namespace and topic discovery
• Hybrid Data Scanning: Live logs + archived Parquet files
• Schema-Aware Parsing: Intelligent message interpretation
• Zero Fallback Data: Pure real MQ data discovery

🎯 DEMONSTRATION

Run the complete demo:

./enhanced_cli_demo.sh

Demo covers:

• Single query mode with all output formats
• Batch file processing
• Database context switching
• Advanced WHERE operators (LIKE, IN, <=, >=, !=)
• Real data scanning from hybrid sources

All enhanced CLI features are production-ready and fully tested! 🚀