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Rene Cannao 4eab519848 Implement MySQL connection pool for MySQL_Tool_Handler ... Added built-in connection pool to MySQL_Tool_Handler for direct MySQL connections to backend servers. Changes: - Added MySQLConnection struct with MYSQL* pointer, host, port, in_use flag - Added connection_pool vector, pool_lock mutex, pool_size counter - Implemented init_connection_pool() to create MYSQL connections using mysql_init/mysql_real_connect - Implemented get_connection() and return_connection() with thread-safe locking - Implemented execute_query() helper method for executing SQL and returning JSON results - Updated tool methods to use actual MySQL connections: - list_schemas: Query information_schema.schemata - list_tables: Query information_schema.tables with metadata - describe_table: Query columns, primary keys, indexes - sample_rows: Execute SELECT with LIMIT - sample_distinct: Execute SELECT DISTINCT with GROUP BY - run_sql_readonly: Execute validated SELECT queries - explain_sql: Execute EXPLAIN queries - Fixed MYSQL forward declaration (use typedef struct st_mysql MYSQL) The connection pool creates one connection per configured host:port pair with 5-second timeouts for connect/read/write operations.		3 months ago
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genai_demo_event	Implement MySQL connection pool for MySQL_Tool_Handler	3 months ago