100 lines
3.2 KiB
Python
100 lines
3.2 KiB
Python
# -*- coding: utf-8 -*-
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"""数据库批量操作"""
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import psycopg2.extras
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import re
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class DatabaseOperations:
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"""数据库批量操作封装"""
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def __init__(self, connection):
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self._connection = connection
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self.conn = connection.conn
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def batch_execute(self, sql: str, rows: list, page_size: int = 1000):
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"""批量执行SQL"""
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if not rows:
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return
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with self.conn.cursor() as c:
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psycopg2.extras.execute_batch(c, sql, rows, page_size=page_size)
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def batch_upsert_with_returning(self, sql: str, rows: list,
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page_size: int = 1000) -> tuple:
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"""批量UPSERT并返回插入/更新计数"""
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if not rows:
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return (0, 0)
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use_returning = "RETURNING" in sql.upper()
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with self.conn.cursor() as c:
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if not use_returning:
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psycopg2.extras.execute_batch(c, sql, rows, page_size=page_size)
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return (0, 0)
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# 尝试向量化执行
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try:
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m = re.search(r"VALUES\s*\((.*?)\)", sql, flags=re.IGNORECASE | re.DOTALL)
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if m:
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tpl = "(" + m.group(1) + ")"
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base_sql = sql[:m.start()] + "VALUES %s" + sql[m.end():]
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ret = psycopg2.extras.execute_values(
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c, base_sql, rows, template=tpl, page_size=page_size, fetch=True
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)
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if not ret:
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return (0, 0)
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inserted = sum(1 for rec in ret if self._is_inserted(rec))
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return (inserted, len(ret) - inserted)
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except Exception:
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pass
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# 回退：逐行执行
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inserted = 0
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updated = 0
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for r in rows:
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c.execute(sql, r)
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try:
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rec = c.fetchone()
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except Exception:
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rec = None
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if self._is_inserted(rec):
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inserted += 1
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else:
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updated += 1
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return (inserted, updated)
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@staticmethod
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def _is_inserted(rec) -> bool:
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"""判断是否为插入操作"""
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if rec is None:
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return False
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if isinstance(rec, tuple):
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return bool(rec[0])
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if isinstance(rec, dict):
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return bool(rec.get("inserted"))
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return False
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# --- pass-through helpers -------------------------------------------------
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def commit(self):
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"""提交事务（委托给底层连接）"""
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self._connection.commit()
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def rollback(self):
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"""回滚事务（委托给底层连接）"""
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self._connection.rollback()
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def query(self, sql: str, args=None):
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"""执行查询并返回结果"""
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return self._connection.query(sql, args)
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def execute(self, sql: str, args=None):
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"""执行任意 SQL"""
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self._connection.execute(sql, args)
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def cursor(self):
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"""暴露原生 cursor，供特殊操作使用"""
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return self.conn.cursor()
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