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MySQL Tool - Quản lý MySQL qua pymysql.
Author: Hieu Louis (2026)
Operations: query, list_tables, describe_table, create_index, optimize, explain.
"""
from __future__ import annotations
import json
from datetime import date, datetime, decimal
from typing import Any, Dict, List, Optional
from .base import Tool, ToolResult, ToolContext, ToolCategory, ToolSafety
DDL_OPS = {"create_index"}
MAINTENANCE_OPS = {"optimize"}
def _json_default(o: Any) -> Any:
if isinstance(o, (datetime, date)):
return o.isoformat()
if isinstance(o, decimal.Decimal):
return float(o)
if isinstance(o, bytes):
try:
return o.decode("utf-8")
except Exception:
return o.hex()
return str(o)
def _parse_mysql_url(url: str) -> Dict[str, Any]:
"""Parse mysql://user:pw@host:3306/db // parse MySQL URL."""
from urllib.parse import urlparse
p = urlparse(url)
return {
"host": p.hostname or "localhost",
"port": p.port or 3306,
"user": p.username or "root",
"password": p.password or "",
"database": (p.path or "/").lstrip("/"),
}
class MySQLTool(Tool):
"""Quản lý MySQL: query, list_tables, describe_table, create_index, optimize, explain."""
category = ToolCategory.DATABASE
safety = ToolSafety.DANGEROUS
requires_confirmation = True
@property
def name(self) -> str:
return "mysql"
@property
def description(self) -> str:
return (
"Quản lý MySQL qua pymysql: query (parameterized), list_tables, "
"describe_table, create_index, optimize (ANALYZE TABLE), explain."
)
@property
def parameters(self) -> Dict[str, Any]:
return {
"type": "object",
"properties": {
"connection_string": {"type": "string", "description": "MySQL URL (mysql://user:pw@host:3306/db)"},
"operation": {
"type": "string",
"enum": ["query", "list_tables", "describe_table", "create_index", "optimize", "explain"],
"description": "MySQL operation",
},
"query": {"type": "string", "description": "SQL query (operation=query/explain)"},
"params": {
"oneOf": [{"type": "array", "items": {}}, {"type": "object"}],
"description": "Tham số bind (%s hoặc %(name)s)",
},
"table": {"type": "string", "description": "Table name (describe_table/create_index)"},
"index_name": {"type": "string", "description": "Tên index (create_index)"},
"columns": {"type": "array", "items": {"type": "string"}, "description": "Cột cho index"},
"limit": {"type": "integer", "description": "Giới hạn rows (default 1000)"},
},
"required": ["connection_string", "operation"],
}
def validate_args(self, args: Dict[str, Any]) -> Optional[str]:
if not args.get("connection_string"):
return "Missing required arg: connection_string"
op = args.get("operation")
if not op:
return "Missing required arg: operation"
if op == "query" and not args.get("query"):
return "Operation 'query' requires 'query' arg"
if op in {"describe_table", "create_index"} and not args.get("table"):
return f"Operation '{op}' requires 'table' arg"
if op == "create_index" and not args.get("columns"):
return "Operation 'create_index' requires 'columns' arg"
return None
def execute(self, args: Dict[str, Any], context: ToolContext) -> ToolResult:
cs: str = args["connection_string"]
op: str = args["operation"]
# Lazy import pymysql (fallback mysql.connector) // lazy import
try:
import pymysql # type: ignore
import pymysql.cursors # type: ignore
driver = "pymysql"
except ImportError:
try:
import mysql.connector # type: ignore
import mysql.connector.cursor # type: ignore
driver = "mysql.connector"
except ImportError as e:
return ToolResult(
success=False,
error=f"Neither pymysql nor mysql-connector installed: {e}",
return_code=127,
)
# Dry-run cho DDL // dry-run
if context.dry_run and op in DDL_OPS:
return ToolResult(
success=True,
output=f"[dry-run] Would run {op} on {args.get('table')}",
metadata={"dry_run": True, "operation": op},
)
cfg = _parse_mysql_url(cs)
try:
if driver == "pymysql":
conn = pymysql.connect(
host=cfg["host"], port=cfg["port"], user=cfg["user"],
password=cfg["password"], database=cfg["database"] or None,
cursorclass=pymysql.cursors.DictCursor, charset="utf8mb4",
autocommit=op in DDL_OPS,
)
else:
conn = mysql.connector.connect(
host=cfg["host"], port=cfg["port"], user=cfg["user"],
password=cfg["password"], database=cfg["database"] or None,
charset="utf8mb4", autocommit=op in DDL_OPS,
)
cur = conn.cursor(dictionary=True) if driver == "mysql.connector" else conn.cursor()
if op == "list_tables":
cur.execute("SHOW TABLES")
rows = cur.fetchall()
payload = json.dumps(rows, default=_json_default, ensure_ascii=False, indent=2)
return ToolResult(success=True, output=payload, metadata={"count": len(rows)})
if op == "describe_table":
cur.execute(f"DESCRIBE `{args['table']}`")
rows = cur.fetchall()
payload = json.dumps(rows, default=_json_default, ensure_ascii=False, indent=2)
return ToolResult(success=True, output=payload, metadata={"table": args["table"], "columns": len(rows)})
if op == "query":
params = args.get("params") or ()
cur.execute(args["query"], params)
if cur.description:
rows = cur.fetchmany(int(args.get("limit") or 1000))
payload = json.dumps(rows, default=_json_default, ensure_ascii=False, indent=2)
return ToolResult(success=True, output=payload, metadata={"rowcount": len(rows)})
conn.commit()
return ToolResult(success=True, output=json.dumps({"rowcount": cur.rowcount}), metadata={"rowcount": cur.rowcount})
if op == "create_index":
idx = args["index_name"] or f"idx_{args['table']}_" + "_".join(args["columns"])
cols = ", ".join(f"`{c}`" for c in args["columns"])
cur.execute(f"CREATE INDEX `{idx}` ON `{args['table']}` ({cols})")
return ToolResult(success=True, output=f"Index created: {idx}", metadata={"index": idx})
if op == "optimize":
cur.execute(f"ANALYZE TABLE `{args['table']}`" if args.get("table") else "ANALYZE TABLE")
rows = cur.fetchall()
payload = json.dumps(rows, default=_json_default, ensure_ascii=False, indent=2)
return ToolResult(success=True, output=payload, metadata={"operation": "optimize"})
if op == "explain":
cur.execute("EXPLAIN " + args["query"])
rows = cur.fetchall()
payload = json.dumps(rows, default=_json_default, ensure_ascii=False, indent=2)
return ToolResult(success=True, output=payload, metadata={"operation": "explain"})
return ToolResult(success=False, error=f"Unknown operation: {op}", return_code=1)
except Exception as e:
return ToolResult(success=False, error=str(e), return_code=1)
finally:
try:
cur.close(); conn.close()
except Exception:
pass
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