MySQL和PostgreSQL：在Web开发中的最佳实践

import mysql.connector
from mysql.connector import pooling

# 创建MySQL连接池
mysql_pool = mysql.connector.pooling.MySQLConnectionPool(
    pool_name="my_pool",
    pool_size=10,
    host="localhost",
    database="mydb",
    user="user",
    password="password"
)

# 从连接池获取连接
mysql_conn = mysql_pool.get_connection()

# 执行SQL查询
mysql_cursor = mysql_conn.cursor()
mysql_cursor.execute("SELECT * FROM mytable")
results = mysql_cursor.fetchall()

# 关闭数据库连接和游标
mysql_cursor.close()
mysql_conn.close()

import psycopg2
from psycopg2 import pool
 
# 创建PostgreSQL连接池
pg_pool = psycopg2.pool.SimpleConnectionPool(
    minconn=1,
    maxconn=10,
    host="localhost",
    database="mydb",
    user="user",
    password="password"
)
 
# 从连接池获取连接
pg_conn = pg_pool.getconn()
 
# 执行SQL查询
pg_cursor = pg_conn.cursor()
pg_cursor.execute("SELECT * FROM mytable")
results = pg_cursor.fetchall()
 
# 关闭数据库连接和游标
pg_cursor.close()
pg_pool.putconn(pg_conn)

# MySQL示例代码，使用事务插入数据
try:
    mysql_conn.start_transaction()
    mysql_cursor = mysql_conn.cursor()

    # 执行多个插入操作
    mysql_cursor.execute("INSERT INTO mytable (column1, column2) VALUES (%s, %s)", (value1, value2))
    mysql_cursor.execute("INSERT INTO mytable (column1, column2) VALUES (%s, %s)", (value3, value4))
 
    # 提交事务
    mysql_conn.commit()
except Exception as e:
    # 发生错误时回滚事务
    mysql_conn.rollback()
finally:
    mysql_cursor.close()
    mysql_conn.close()

# PostgreSQL示例代码，使用事务插入数据
try:
    pg_conn.autocommit = False
    pg_cursor = pg_conn.cursor()

    # 执行多个插入操作
    pg_cursor.execute("INSERT INTO mytable (column1, column2) VALUES (%s, %s)", (value1, value2))
    pg_cursor.execute("INSERT INTO mytable (column1, column2) VALUES (%s, %s)", (value3, value4))
 
    # 提交事务
    pg_conn.commit()
except Exception as e:
    # 发生错误时回滚事务
    pg_conn.rollback()
finally:
    pg_cursor.close()
    pg_pool.putconn(pg_conn)