{"id":42416,"date":"2025-06-08T15:27:51","date_gmt":"2025-06-08T07:27:51","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/42416.html"},"modified":"2025-06-08T15:27:51","modified_gmt":"2025-06-08T07:27:51","slug":"python-mysql%e8%bf%9c%e7%a8%8b%e6%8e%a7%e5%88%b6","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/42416.html","title":{"rendered":"Python\u2014\u2014MySQL\u8fdc\u7a0b\u63a7\u5236"},"content":{"rendered":"

\u76ee\u5f55<\/p>\n

MySQL\u8fd0\u7a0b\u63a7\u5236<\/p>\n

1. \u51c6\u5907\u5de5\u4f5c<\/p>\n

2. \u8fde\u63a5MySQL\u6570\u636e\u5e93<\/p>\n

\u4f7f\u7528mysql-connector<\/p>\n

\u4f7f\u7528PyMySQL<\/p>\n

3. \u57fa\u672cCRUD\u64cd\u4f5c<\/p>\n

\u521b\u5efa\u8868<\/p>\n

\u63d2\u5165\u6570\u636e<\/p>\n

\u67e5\u8be2\u6570\u636e<\/p>\n

\u66f4\u65b0\u6570\u636e<\/p>\n

\u5220\u9664\u6570\u636e<\/p>\n

4. \u9ad8\u7ea7\u64cd\u4f5c<\/p>\n

\u4e8b\u52a1\u5904\u7406<\/p>\n

\u4f7f\u7528ORM\u6846\u67b6 – SQLAlchemy<\/p>\n

5. \u6700\u4f73\u5b9e\u8df5<\/p>\n

6. \u5e38\u89c1\u9519\u8bef\u5904\u7406<\/p>\n

\u8fde\u63a5\u6c60<\/p>\n

\u4e00\u3001\u8fde\u63a5\u6c60\u7684\u4f5c\u7528<\/p>\n

\u4e8c\u3001\u4f18\u52bf\u4e0e\u52a3\u52bf<\/p>\n

\u4e09\u3001\u90e8\u7f72\u4e0e\u4f7f\u7528<\/p>\n

1. \u5e38\u7528\u5e93\u53ca\u5b89\u88c5<\/p>\n

2. \u57fa\u7840\u4f7f\u7528\u793a\u4f8b<\/p>\n

3. \u751f\u4ea7\u73af\u5883\u5efa\u8bae<\/p>\n

\u56db\u3001\u6027\u80fd\u4f18\u5316\u6280\u5de7<\/p>\n

\u4e8b\u52a1\u7ba1\u7406\u00a0<\/p>\n

\u4e00\u3001\u4e8b\u52a1\u6838\u5fc3\u6982\u5ff5<\/p>\n

\u4e8c\u3001\u5178\u578b\u95ee\u9898\u573a\u666f<\/p>\n

\u4e09\u3001\u9009\u578b\u5efa\u8bae<\/p>\n

\u56db\u3001Python\u914d\u7f6e\u793a\u4f8b<\/p>\n

\n

MySQL\u8fd0\u7a0b\u63a7\u5236<\/h2>\n

MySQL\u662f\u6700\u6d41\u884c\u7684\u5173\u7cfb\u578b\u6570\u636e\u5e93\u4e4b\u4e00，Python\u901a\u8fc7\u591a\u79cd\u65b9\u5f0f\u53ef\u4ee5\u4e0eMySQL\u8fdb\u884c\u4ea4\u4e92\u3002\u4e0b\u9762\u6211\u5c06\u8be6\u7ec6\u4ecb\u7ecdPython\u64cd\u4f5cMySQL\u7684\u5e38\u7528\u65b9\u6cd5\u548c\u6700\u4f73\u5b9e\u8df5\u3002<\/p>\n

1. \u51c6\u5907\u5de5\u4f5c<\/h3>\n

\u5728\u5f00\u59cb\u4e4b\u524d，\u4f60\u9700\u8981：<\/p>\n

  • \u5b89\u88c5MySQL\u670d\u52a1\u5668<\/li>\n
  • \u5b89\u88c5Python\u7684MySQL\u8fde\u63a5\u5e93<\/li>\n

    \u63a8\u8350\u4f7f\u7528mysql-connector-python\u6216PyMySQL\u5e93：<\/p>\n

    pip install mysql-connector-python
    \n# \u6216
    \npip install pymysql <\/p>\n

    2. \u8fde\u63a5MySQL\u6570\u636e\u5e93<\/h3>\n

    \u4f7f\u7528mysql-connector<\/h4>\n

    import mysql.connector <\/p>\n

    # \u521b\u5efa\u8fde\u63a5
    \nconn = mysql.connector.connect(
    \n host="localhost",
    \n user="your_username",
    \n password="your_password",
    \n database="your_database"
    \n) <\/p>\n

    # \u521b\u5efa\u6e38\u6807
    \ncursor = conn.cursor() <\/p>\n

    # \u6267\u884cSQL\u67e5\u8be2
    \ncursor.execute("SELECT * FROM your_table") <\/p>\n

    # \u83b7\u53d6\u7ed3\u679c
    \nresults = cursor.fetchall()
    \nfor row in results:
    \nprint(row) <\/p>\n

    # \u5173\u95ed\u8fde\u63a5
    \ncursor.close()
    \nconn.close() <\/p>\n

    \u4f7f\u7528PyMySQL<\/h4>\n

    import pymysql <\/p>\n

    # \u521b\u5efa\u8fde\u63a5
    \nconn = pymysql.connect(
    \n host='localhost',
    \n user='your_username',
    \n password='your_password',
    \n db='your_database',
    \n charset='utf8mb4',
    \n cursorclass=pymysql.cursors.DictCursor
    \n) <\/p>\n

    # \u4f7f\u7528\u4e0a\u4e0b\u6587\u7ba1\u7406\u5668\u81ea\u52a8\u7ba1\u7406\u8fde\u63a5
    \nwith conn:
    \n\u00a0 with conn.cursor() as cursor:
    \n\u00a0 # \u6267\u884cSQL\u67e5\u8be2
    \n\u00a0 sql = "SELECT * FROM your_table"
    \n\u00a0 cursor.execute(sql)<\/p>\n

    \u00a0 # \u83b7\u53d6\u7ed3\u679c
    \n\u00a0 results = cursor.fetchall()
    \n\u00a0 for row in results:
    \n\u00a0 print(row) <\/p>\n

    3. \u57fa\u672cCRUD\u64cd\u4f5c<\/h3>\n

    \u521b\u5efa\u8868<\/h4>\n

    cursor.execute("""
    \nCREATE TABLE IF NOT EXISTS users (
    \n\u00a0 id INT AUTO_INCREMENT PRIMARY KEY,
    \n\u00a0 name VARCHAR(255) NOT NULL,
    \n\u00a0 email VARCHAR(255) NOT NULL UNIQUE,
    \n\u00a0 created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
    \n )
    \n""") <\/p>\n

    \u63d2\u5165\u6570\u636e<\/h4>\n

    # \u5355\u6761\u63d2\u5165
    \nsql = "INSERT INTO users (name, email) VALUES (%s, %s)"
    \nval = ("John Doe", "john@example.com")
    \ncursor.execute(sql, val) <\/p>\n

    # \u591a\u6761\u63d2\u5165
    \nsql = "INSERT INTO users (name, email) VALUES (%s, %s)"
    \nval = [
    \n\u00a0 ("Jane Smith", "jane@example.com"),
    \n\u00a0 ("Bob Johnson", "bob@example.com")
    \n]
    \ncursor.executemany(sql, val) <\/p>\n

    # \u63d0\u4ea4\u4e8b\u52a1
    \nconn.commit() <\/p>\n

    \u67e5\u8be2\u6570\u636e<\/h4>\n

    # \u67e5\u8be2\u6240\u6709\u8bb0\u5f55
    \ncursor.execute("SELECT * FROM users")
    \nrows = cursor.fetchall() <\/p>\n

    # \u67e5\u8be2\u5355\u6761\u8bb0\u5f55
    \ncursor.execute("SELECT * FROM users WHERE id = %s", (1,))
    \nrow = cursor.fetchone() <\/p>\n

    # \u5e26\u6761\u4ef6\u7684\u67e5\u8be2
    \ncursor.execute("SELECT name, email FROM users WHERE name LIKE %s", ("%John%",))
    \nrows = cursor.fetchall() <\/p>\n

    \u66f4\u65b0\u6570\u636e<\/h4>\n

    sql = "UPDATE users SET name = %s WHERE id = %s"
    \nval = ("John Smith", 1)
    \ncursor.execute(sql, val)
    \nconn.commit() <\/p>\n

    \u5220\u9664\u6570\u636e<\/h4>\n

    sql = "DELETE FROM users WHERE id = %s"
    \nval = (1,)
    \ncursor.execute(sql, val)
    \nconn.commit() <\/p>\n

    4. \u9ad8\u7ea7\u64cd\u4f5c<\/h3>\n

    \u4e8b\u52a1\u5904\u7406<\/h4>\n

    try:
    \n # \u5f00\u59cb\u4e8b\u52a1
    \n conn.start_transaction()<\/p>\n

    # \u6267\u884c\u591a\u4e2aSQL\u64cd\u4f5c
    \n cursor.execute(sql1, val1)
    \n cursor.execute(sql2, val2)<\/p>\n

    # \u63d0\u4ea4\u4e8b\u52a1 conn.commit()
    \nexcept Exception as e:
    \n # \u53d1\u751f\u9519\u8bef\u65f6\u56de\u6eda
    \n conn.rollback()
    \n print(f"Transaction failed: {e}") <\/p>\n

    \u4f7f\u7528ORM\u6846\u67b6 – SQLAlchemy<\/h4>\n

    from sqlalchemy import create_engine, Column, Integer, String
    \nfrom sqlalchemy.ext.declarative import declarative_base
    \nfrom sqlalchemy.orm import sessionmaker <\/p>\n

    # \u521b\u5efa\u5f15\u64ce
    \nengine = create_engine('mysql+pymysql:\/\/user:password@localhost\/dbname') <\/p>\n

    # \u58f0\u660e\u57fa\u7c7b
    \nBase = declarative_base() <\/p>\n

    # \u5b9a\u4e49\u6a21\u578b
    \nclass User(Base):
    \n __tablename__ = 'users'
    \n\u00a0
    \n\u00a0id = Column(Integer, primary_key=True)
    \n name = Column(String(255))
    \n email = Column(String(255), unique=True) <\/p>\n

    # \u521b\u5efa\u8868
    \nBase.metadata.create_all(engine) <\/p>\n

    # \u521b\u5efa\u4f1a\u8bdd
    \nSession = sessionmaker(bind=engine)
    \nsession = Session() <\/p>\n

    # \u6dfb\u52a0\u65b0\u7528\u6237
    \nnew_user = User(name='Alice', email='alice@example.com')
    \nsession.add(new_user)
    \nsession.commit() <\/p>\n

    # \u67e5\u8be2\u7528\u6237
    \nusers = session.query(User).filter_by(name='Alice').all()
    \nfor user in users:
    \n print(user.name, user.email) <\/p>\n

    5. \u6700\u4f73\u5b9e\u8df5<\/h3>\n
  • \u200c\u4f7f\u7528\u53c2\u6570\u5316\u67e5\u8be2\u200c：\u9632\u6b62SQL\u6ce8\u5165\u653b\u51fb<\/li>\n
  • \u200c\u4f7f\u7528\u4e0a\u4e0b\u6587\u7ba1\u7406\u5668\u200c：\u786e\u4fdd\u8fde\u63a5\u548c\u6e38\u6807\u6b63\u786e\u5173\u95ed<\/li>\n
  • \u200c\u5904\u7406\u5f02\u5e38\u200c：\u6355\u83b7\u5e76\u5904\u7406\u6570\u636e\u5e93\u64cd\u4f5c\u4e2d\u7684\u5f02\u5e38<\/li>\n
  • \u200c\u8fde\u63a5\u6c60\u200c：\u5728\u9ad8\u5e76\u53d1\u5e94\u7528\u4e2d\u4f7f\u7528\u8fde\u63a5\u6c60<\/li>\n
  • \u200c\u7d22\u5f15\u4f18\u5316\u200c：\u4e3a\u5e38\u7528\u67e5\u8be2\u5b57\u6bb5\u6dfb\u52a0\u7d22\u5f15<\/li>\n

    6. \u5e38\u89c1\u9519\u8bef\u5904\u7406<\/h3>\n

    try:
    \n conn = mysql.connector.connect(**config)
    \n cursor = conn.cursor()
    \n cursor.execute("SELECT * FROM non_existent_table")
    \nexcept mysql.connector.Error as err:
    \n print(f"Error: {err}")
    \nfinally: if 'conn' in locals() and conn.is_connected():
    \n cursor.close()
    \n conn.close() <\/p>\n

    \u8fde\u63a5\u6c60<\/h2>\n

    \u4e00\u3001\u8fde\u63a5\u6c60\u7684\u4f5c\u7528<\/h4>\n

    \u00a0 \u00a0 \u6570\u636e\u5e93\u8fde\u63a5\u6c60\u662f\u4e00\u79cd\u9884\u5148\u521b\u5efa\u5e76\u7ba1\u7406\u6570\u636e\u5e93\u8fde\u63a5\u7684\u6280\u672f，\u4e3b\u8981\u89e3\u51b3\u9891\u7e41\u521b\u5efa\/\u9500\u6bc1\u8fde\u63a5\u7684\u6027\u80fd\u635f\u8017\u95ee\u9898\u3002\u5176\u6838\u5fc3\u601d\u60f3\u662f\u8fde\u63a5\u590d\u7528，\u5e94\u7528\u7a0b\u5e8f\u4ece\u6c60\u4e2d\u83b7\u53d6\u8fde\u63a5，\u4f7f\u7528\u540e\u5f52\u8fd8\u800c\u975e\u76f4\u63a5\u5173\u95ed\u3002<\/p>\n

    \u4e8c\u3001\u4f18\u52bf\u4e0e\u52a3\u52bf<\/h4>\n

    \u4f18\u52bf：<\/p>\n

  • \n

    \u6027\u80fd\u63d0\u5347：\u51cf\u5c11\u8fde\u63a5\u521b\u5efa\/\u9500\u6bc1\u7684TCP\u4e09\u6b21\u63e1\u624b\u548c\u8ba4\u8bc1\u5f00\u9500，\u964d\u4f4e\u5ef6\u8fdf<\/p>\n<\/li>\n

  • \n

    \u8d44\u6e90\u63a7\u5236：\u901a\u8fc7max_connections\u9650\u5236\u6700\u5927\u8fde\u63a5\u6570，\u9632\u6b62\u6570\u636e\u5e93\u8fc7\u8f7d<\/p>\n<\/li>\n

  • \n

    \u54cd\u5e94\u52a0\u901f：\u521d\u59cb\u5316\u65f6\u9884\u5efa\u8fde\u63a5，\u4e1a\u52a1\u8bf7\u6c42\u53ef\u76f4\u63a5\u4f7f\u7528<\/p>\n<\/li>\n

  • \n

    \u6cc4\u6f0f\u9632\u62a4：\u8d85\u65f6\u56de\u6536\u673a\u5236\u907f\u514d\u8fde\u63a5\u957f\u671f\u5360\u7528<\/p>\n<\/li>\n

    \u52a3\u52bf：<\/p>\n

  • \n

    \u9700\u8981\u5408\u7406\u914d\u7f6e\u53c2\u6570（\u5982\u6700\u5927\/\u6700\u5c0f\u8fde\u63a5\u6570）<\/p>\n<\/li>\n

  • \n

    \u8fde\u63a5\u72b6\u6001\u7ef4\u62a4\u589e\u52a0\u590d\u6742\u5ea6<\/p>\n<\/li>\n

  • \n

    \u4e0d\u9002\u7528\u4e8e\u8d85\u77ed\u751f\u547d\u5468\u671f\u5e94\u7528<\/p>\n<\/li>\n

    \u4e09\u3001\u90e8\u7f72\u4e0e\u4f7f\u7528<\/h4>\n

    1. \u5e38\u7528\u5e93\u53ca\u5b89\u88c5<\/h5>\n

    # SQLAlchemy（\u652f\u6301\u591a\u79cd\u6570\u636e\u5e93）
    \npip install sqlalchemy<\/p>\n

    # DBUtils（\u901a\u7528\u8fde\u63a5\u6c60）
    \npip install dbutils<\/p>\n

    # Psycopg2（PostgreSQL\u4e13\u7528）
    \npip install psycopg2-binary <\/p>\n

    2. \u57fa\u7840\u4f7f\u7528\u793a\u4f8b<\/h5>\n

    SQLAlchemy\u8fde\u63a5\u6c60\u914d\u7f6e：<\/p>\n

    from sqlalchemy import create_engine<\/p>\n

    # \u5e26\u8fde\u63a5\u6c60\u7684\u914d\u7f6e（\u8fde\u63a5\u6c60\u5927\u5c0f5-10）
    \nengine = create_engine(
    \n "mysql+pymysql:\/\/user:pass@host\/db",
    \n pool_size=5,
    \n max_overflow=5,
    \n pool_recycle=3600
    \n) <\/p>\n

    DBUtils\u8fde\u63a5\u6c60\u793a\u4f8b：<\/p>\n

    from dbutils.pooled_db import PooledDB
    \nimport pymysql<\/p>\n

    pool = PooledDB(
    \n creator=pymysql,
    \n maxconnections=10,
    \n host='localhost',
    \n user='root',
    \n database='test'
    \n)
    \nconn = pool.connection() # \u83b7\u53d6\u8fde\u63a5 <\/p>\n

    3. \u751f\u4ea7\u73af\u5883\u5efa\u8bae<\/h5>\n
  • \n

    \u6839\u636eQPS\u8bbe\u7f6epool_size（\u5efa\u8bae=\u5e73\u5747\u5e76\u53d1\u91cf\u00d71.2）<\/p>\n<\/li>\n

  • \n

    \u542f\u7528pool_pre_ping\u81ea\u52a8\u68c0\u6d4b\u5931\u6548\u8fde\u63a5<\/p>\n<\/li>\n

  • \n

    \u4f7f\u7528with\u8bed\u53e5\u786e\u4fdd\u8fde\u63a5\u5f52\u8fd8<\/p>\n<\/li>\n

  • \n

    \u76d1\u63a7\u8fde\u63a5\u6c60\u4f7f\u7528\u7387（\u5982SQLAlchemy\u7684pool.status()）<\/p>\n<\/li>\n

    \u56db\u3001\u6027\u80fd\u4f18\u5316\u6280\u5de7<\/h4>\n
  • \n

    \u4e0d\u540c\u4e1a\u52a1\u4f7f\u7528\u72ec\u7acb\u8fde\u63a5\u6c60\u9694\u79bb\u8d44\u6e90<\/p>\n<\/li>\n

  • \n

    \u52a8\u6001\u8c03\u6574\u8fde\u63a5\u6570（\u5982SQLAlchemy\u7684pool_events）<\/p>\n<\/li>\n

  • \n

    \u914d\u5408\u8fde\u63a5\u6c60\u4f7f\u7528ORM\u7684Session\u7f13\u5b58\u673a\u5236<\/p>\n<\/li>\n

    \u4e8b\u52a1\u7ba1\u7406\u00a0<\/h2>\n

    \u4e00\u3001\u4e8b\u52a1\u6838\u5fc3\u6982\u5ff5<\/h4>\n
  • \n

    \u200cACID\u7279\u6027\u200c<\/p>\n

      \n
    • \u200c\u539f\u5b50\u6027(Atomicity)\u200c：\u4e8b\u52a1\u662f\u4e0d\u53ef\u5206\u5272\u7684\u5de5\u4f5c\u5355\u5143<\/li>\n
    • \u200c\u4e00\u81f4\u6027(Consistency)\u200c：\u4e8b\u52a1\u524d\u540e\u6570\u636e\u5e93\u72b6\u6001\u4fdd\u6301\u4e00\u81f4<\/li>\n
    • \u200c\u9694\u79bb\u6027(Isolation)\u200c：\u5e76\u53d1\u4e8b\u52a1\u4e92\u4e0d\u5e72\u6270<\/li>\n
    • \u200c\u6301\u4e45\u6027(Durability)\u200c：\u4e8b\u52a1\u63d0\u4ea4\u540e\u7ed3\u679c\u6c38\u4e45\u751f\u6548<\/li>\n<\/ul>\n<\/li>\n
    • \n

      \u200c\u9694\u79bb\u7ea7\u522b\u200c<\/p>\n

        \n
      • READ_UNCOMMITTED（\u53ef\u80fd\u8bfb\u53d6\u672a\u63d0\u4ea4\u6570\u636e）<\/li>\n
      • READ_COMMITTED（\u907f\u514d\u810f\u8bfb）<\/li>\n
      • REPEATABLE_READ（\u907f\u514d\u4e0d\u53ef\u91cd\u590d\u8bfb）<\/li>\n
      • SERIALIZABLE（\u5b8c\u5168\u4e32\u884c\u5316）<\/li>\n<\/ul>\n<\/li>\n
        \n

        \u56db\u5927\u9694\u79bb\u7ea7\u522b\u5bf9\u6bd4<\/p>\n\n\u9694\u79bb\u7ea7\u522b\u810f\u8bfb\u4e0d\u53ef\u91cd\u590d\u8bfb\u5e7b\u8bfb\u9501\u673a\u5236\u7279\u70b9<\/tr>\n\n\n\n\n\n
        READ UNCOMMITTED<\/td>\n\u2713<\/td>\n\u2713<\/td>\n\u2713<\/td>\n\u65e0\u8bfb\u9501，\u4ec5\u5199\u9501\u51b2\u7a81<\/td>\n<\/tr>\n
        READ COMMITTED<\/td>\n\u2717<\/td>\n\u2713<\/td>\n\u2713<\/td>\n\u8bfb\u540e\u7acb\u5373\u91ca\u653e\u5171\u4eab\u9501<\/td>\n<\/tr>\n
        REPEATABLE READ<\/td>\n\u2717<\/td>\n\u2717<\/td>\n\u2713*<\/td>\n\u6301\u6709\u8bfb\u9501\u81f3\u4e8b\u52a1\u7ed3\u675f<\/td>\n<\/tr>\n
        SERIALIZABLE<\/td>\n\u2717<\/td>\n\u2717<\/td>\n\u2717<\/td>\n\u8303\u56f4\u9501\u9632\u6b62\u5e7b\u8bfb<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

        *\u6ce8：MySQL\u7684InnoDB\u901a\u8fc7MVCC\u673a\u5236\u5728REPEATABLE READ\u4e0b\u53ef\u907f\u514d\u5e7b\u8bfb<\/p>\n

        \u4e8c\u3001\u5178\u578b\u95ee\u9898\u573a\u666f<\/h4>\n
      • \u200c\u810f\u8bfb\u200c：\u4e8b\u52a1A\u8bfb\u53d6\u4e8b\u52a1B\u672a\u63d0\u4ea4\u7684\u4fee\u6539，B\u56de\u6eda\u5bfc\u81f4A\u83b7\u5f97\u65e0\u6548\u6570\u636e<\/li>\n
      • \u200c\u4e0d\u53ef\u91cd\u590d\u8bfb\u200c：\u4e8b\u52a1A\u4e24\u6b21\u8bfb\u53d6\u540c\u8bb0\u5f55，\u56e0\u4e8b\u52a1B\u63d0\u4ea4\u4fee\u6539\u5bfc\u81f4\u7ed3\u679c\u4e0d\u4e00\u81f4<\/li>\n
      • \u200c\u5e7b\u8bfb\u200c：\u4e8b\u52a1A\u6309\u6761\u4ef6\u67e5\u8be2，\u4e8b\u52a1B\u65b0\u589e\u7b26\u5408\u6761\u4ef6\u8bb0\u5f55\u5bfc\u81f4A\u4e24\u6b21\u7ed3\u679c\u96c6\u4e0d\u540c<\/li>\n

        \u4e09\u3001\u9009\u578b\u5efa\u8bae<\/h4>\n
      • \u200c\u5b9e\u65f6\u5206\u6790\u7cfb\u7edf\u200c：READ UNCOMMITTED（\u5bb9\u5fcd\u810f\u8bfb\u6362\u53d6\u6027\u80fd）<\/li>\n
      • \u200c\u652f\u4ed8\u7cfb\u7edf\u200c：REPEATABLE READ（\u4fdd\u8bc1\u91d1\u989d\u4e00\u81f4\u6027）<\/li>\n
      • \u200c\u7968\u52a1\u7cfb\u7edf\u200c：SERIALIZABLE（\u675c\u7edd\u8d85\u5356\u98ce\u9669）<\/li>\n
      • \u200c\u5e38\u89c4OLTP\u200c：READ COMMITTED（\u5e73\u8861\u6027\u80fd\u4e0e\u4e00\u81f4\u6027）<\/li>\n

        \u56db\u3001Python\u914d\u7f6e\u793a\u4f8b<\/h4>\n

        # PostgreSQL\u8bbe\u7f6e\u9694\u79bb\u7ea7\u522b
        \nimport psycopg2
        \nconn = psycopg2.connect(dsn)
        \nconn.set_isolation_level(
        \n psycopg2.extensions.ISOLATION_LEVEL_REPEATABLE_READ ) <\/p>\n

        \u4e0d\u540c\u6570\u636e\u5e93\u5bf9\u9694\u79bb\u7ea7\u522b\u7684\u5b9e\u73b0\u5b58\u5728\u5dee\u5f02，\u5982Oracle\u9ed8\u8ba4READ COMMITTED\u800cMySQL\u9ed8\u8ba4REPEATABLE READ38，\u5b9e\u9645\u5f00\u53d1\u9700\u7ed3\u5408\u5177\u4f53\u6570\u636e\u5e93\u7279\u6027\u8c03\u6574<\/p>\n

        \n","protected":false},"excerpt":{"rendered":"

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