"""列出两库时间列的完整定义（含 EXTRA），用于生成对齐清单（只读）"""
import pymysql

SQL = """
SELECT TABLE_NAME, COLUMN_NAME, DATA_TYPE, IS_NULLABLE,
       IFNULL(CAST(COLUMN_DEFAULT AS CHAR),'<NULL>'),
       EXTRA, IFNULL(CAST(COLUMN_COMMENT AS CHAR),'')
FROM information_schema.COLUMNS
WHERE TABLE_SCHEMA=%s AND DATA_TYPE IN ('timestamp','datetime')
ORDER BY TABLE_NAME, ORDINAL_POSITION
"""


def snap(db):
    c = pymysql.connect(host="10.8.0.252", user="root", password="Hbhyg731024@", database=db)
    cur = c.cursor()
    cur.execute(SQL, (db,))
    rows = {(r[0], r[1]): r[2:] for r in cur.fetchall()}
    c.close()
    return rows


dev, prd = snap("pms_dev"), snap("pms")
print("== 生产(pms)时间列定义（作为目标）==")
for k in sorted(prd):
    print("  %-28s %-34s %s" % (f"{k[0]}.{k[1]}", str(prd[k][:3]), prd[k][3]))
print()
print("== 仅 dev != prod 的列（扩展对齐候选）==")
n = 0
for k in sorted(set(dev) | set(prd)):
    d, p = dev.get(k), prd.get(k)
    if d != p:
        n += 1
        print("  %-28s dev=%s" % (f"{k[0]}.{k[1]}", d))
        print("  %-28s prd=%s" % ("", p))
print("共", n, "列")
print()
print("== 两库相同的 TIMESTAMP 列（不在漂移范围，需单独决策）==")
for k in sorted(set(dev) & set(prd)):
    if dev[k][0] == "timestamp":
        print("  %-28s %s" % (f"{k[0]}.{k[1]}", dev[k]))