#!/usr/bin/env python3
"""
PMS 数据库工具
用法：
  python tools/db.py import <sql文件>     # 导入SQL文件
  python tools/db.py query <SQL语句>      # 执行查询
  python tools/db.py exec <SQL语句>       # 执行写入
  python tools/db.py tables               # 列出所有表
  python tools/db.py count                # 统计各表数据量
"""

import sys
import pymysql

# 数据库配置
DB_CONFIG = {
    'host': '10.8.0.252',
    'user': 'root',
    'password': 'Hbhyg731024@',
    'database': 'pms',
    'charset': 'utf8mb4',
}

def get_conn():
    return pymysql.connect(**DB_CONFIG)

def import_sql(filepath):
    """导入SQL文件"""
    with open(filepath, 'r', encoding='utf-8') as f:
        sql = f.read()
    
    conn = get_conn()
    cur = conn.cursor()
    
    # 按分号分割SQL语句
    statements = [s.strip() for s in sql.split(';') if s.strip()]
    
    success = 0
    fail = 0
    for stmt in statements:
        try:
            cur.execute(stmt)
            success += 1
        except Exception as e:
            print(f"  ✗ 失败: {str(e)[:80]}")
            fail += 1
    
    conn.commit()
    conn.close()
    print(f"导入完成: 成功 {success}, 失败 {fail}")

def query(sql):
    """执行查询"""
    conn = get_conn()
    cur = conn.cursor()
    cur.execute(sql)
    columns = [desc[0] for desc in cur.description]
    rows = cur.fetchall()
    conn.close()
    
    if not rows:
        print("无数据")
        return
    
    # 打印表头
    print('\t'.join(columns))
    print('-' * 50)
    for row in rows:
        print('\t'.join(str(v) for v in row))

def execute(sql):
    """执行写入"""
    conn = get_conn()
    cur = conn.cursor()
    try:
        cur.execute(sql)
        conn.commit()
        print(f"执行成功, 影响行数: {cur.rowcount}")
    except Exception as e:
        print(f"执行失败: {e}")
        conn.rollback()
    finally:
        conn.close()

def tables():
    """列出所有表"""
    query("SHOW TABLES")

def count():
    """统计各表数据量"""
    conn = get_conn()
    cur = conn.cursor()
    cur.execute("SHOW TABLES")
    tables = [row[0] for row in cur.fetchall()]
    
    print("表名\t\t数据量")
    print("-" * 30)
    for t in tables:
        cur.execute(f"SELECT COUNT(*) FROM `{t}`")
        cnt = cur.fetchone()[0]
        print(f"{t}\t{cnt}")
    conn.close()

def main():
    if len(sys.argv) < 2:
        print(__doc__)
        return
    
    cmd = sys.argv[1]
    
    if cmd == 'import' and len(sys.argv) >= 3:
        import_sql(sys.argv[2])
    elif cmd == 'query' and len(sys.argv) >= 3:
        query(' '.join(sys.argv[2:]))
    elif cmd == 'exec' and len(sys.argv) >= 3:
        execute(' '.join(sys.argv[2:]))
    elif cmd == 'tables':
        tables()
    elif cmd == 'count':
        count()
    else:
        print(__doc__)

if __name__ == '__main__':
    main()