企业官网建设流程全解析

建网站 多少钱钱,农场游戏系统开发 网站建设推广,连云港网站建设培训,wordpress 固定链接 无法访问安装必要的驱动和工具KingbaseES提供了Python的适配驱动psycopg2或kingbase-python。推荐使用psycopg2#xff0c;因其兼容PostgreSQL协议且社区支持更广泛。通过pip安装#xff1a;pip install psycopg2-binary若需使用官方驱动#xff0c;需从KingbaseES官网下载kingbase-…安装必要的驱动和工具KingbaseES提供了Python的适配驱动psycopg2或kingbase-python。推荐使用psycopg2因其兼容PostgreSQL协议且社区支持更广泛。通过pip安装pip install psycopg2-binary若需使用官方驱动需从KingbaseES官网下载kingbase-python驱动包解压后运行python setup.py install配置数据库连接参数连接KingbaseES需要以下参数主机地址、端口默认54321、数据库名、用户名、密码。示例配置字典db_config { host: 127.0.0.1, port: 54321, database: test_db, user: system, password: your_password }建立数据库连接使用psycopg2建立连接并创建游标import psycopg2 conn psycopg2.connect(**db_config) cursor conn.cursor()执行简单查询验证连接cursor.execute(SELECT version();) print(cursor.fetchone())执行CRUD操作创建表create_table_sql CREATE TABLE IF NOT EXISTS users ( id SERIAL PRIMARY KEY, name VARCHAR(100), email VARCHAR(100) UNIQUE ) cursor.execute(create_table_sql) conn.commit()插入数据insert_sql INSERT INTO users (name, email) VALUES (%s, %s) cursor.execute(insert_sql, (张三, zhangsanexample.com)) conn.commit()批量插入data [(李四, lisiexample.com), (王五, wangwuexample.com)] cursor.executemany(insert_sql, data) conn.commit()查询数据cursor.execute(SELECT * FROM users WHERE name LIKE %s, (张%,)) for row in cursor.fetchall(): print(row)事务管理与异常处理使用上下文管理器确保资源释放try: with conn.cursor() as cursor: cursor.execute(UPDATE users SET email%s WHERE id%s, (new_emailexample.com, 1)) conn.commit() except psycopg2.Error as e: conn.rollback() print(f数据库错误: {e}) finally: if conn is not None: conn.close()使用连接池提升性能对于高频访问场景建议使用psycopg2.poolfrom psycopg2 import pool connection_pool pool.SimpleConnectionPool( minconn1, maxconn10, **db_config )获取连接示例conn connection_pool.getconn() cursor conn.cursor() cursor.execute(SELECT * FROM users) connection_pool.putconn(conn)数据类型映射处理KingbaseES与Python类型自动转换特殊类型需注意BYTEA类型使用psycopg2.Binary包装JSON类型直接传递Python字典示例JSON操作import json cursor.execute(CREATE TABLE data (id SERIAL, info JSONB)) cursor.execute(INSERT INTO data (info) VALUES (%s), (json.dumps({key: value}),))性能优化技巧启用预处理语句cursor.execute(PREPARE user_query AS SELECT * FROM users WHERE id$1) cursor.execute(EXECUTE user_query (1), [1])使用服务器端游标处理大数据集cursor conn.cursor(server_side_cursor) cursor.itersize 1000 # 每次获取1000条 cursor.execute(SELECT * FROM large_table) for row in cursor: process_row(row)常用运维操作备份数据库命令需使用kb_dump工具kb_dump -h 127.0.0.1 -p 54321 -U system -F c -f backup.dump test_db恢复数据库kb_restore -h 127.0.0.1 -p 54321 -U system -d test_db backup.dumphttps://www.zhihu.com/zvideo/1992385373905654507/https://www.zhihu.com/zvideo/1992385371703628812/https://www.zhihu.com/zvideo/1992385370181092667/https://www.zhihu.com/zvideo/1992385365475087279/https://www.zhihu.com/zvideo/1992385364946600276/https://www.zhihu.com/zvideo/1992385364212613491/https://www.zhihu.com/zvideo/1992385364644619208/https://www.zhihu.com/zvideo/1992385364011267670/https://www.zhihu.com/zvideo/1992385361096250275/https://www.zhihu.com/zvideo/1992385358852298426/https://www.zhihu.com/zvideo/1992385355186446722/https://www.zhihu.com/zvideo/1992385353466791686/https://www.zhihu.com/zvideo/1992385348307788190/https://www.zhihu.com/zvideo/1992385346567157317/https://www.zhihu.com/zvideo/1992385341378798004/https://www.zhihu.com/zvideo/1992385341085209633/https://www.zhihu.com/zvideo/1992385340955177118/https://www.zhihu.com/zvideo/1992385336144307915/https://www.zhihu.com/zvideo/1992385335276115264/https://www.zhihu.com/zvideo/1992385330452649728/https://www.zhihu.com/zvideo/1992385328812664040/https://www.zhihu.com/zvideo/1992385326325445146/https://www.zhihu.com/zvideo/1992385325612414583/https://www.zhihu.com/zvideo/1992385325381734592/https://www.zhihu.com/zvideo/1992385324026982943/https://www.zhihu.com/zvideo/1992385317852963935/https://www.zhihu.com/zvideo/1992385310621984493/https://www.zhihu.com/zvideo/1992385309548250555/https://www.zhihu.com/zvideo/1992385307849553168/https://www.zhihu.com/zvideo/1992385306482217062/https://www.zhihu.com/zvideo/1992385305425250200/https://www.zhihu.com/zvideo/1992385301088342975/https://www.zhihu.com/zvideo/1992385298768863440/https://www.zhihu.com/zvideo/1992385298605315785/https://www.zhihu.com/zvideo/1992385291441440502/https://www.zhihu.com/zvideo/1992385289184883945/https://www.zhihu.com/zvideo/1992385285414220040/https://www.zhihu.com/zvideo/1992385282188804226/https://www.zhihu.com/zvideo/1992385280712402690/