# MySQL增强版扩展

# 简介

`mysqli` 扩展允许访问 MySQL 4.1 及以上版本提供的功能。关于 MySQL 数据库服务器的更多信息请参阅 » http://www.mysql.com/。

可在 概述 中找到从 PHP 中使用 MySQL 的软件概述。

MySQL 的文档请查看 » http://dev.mysql.com/doc/。

本文档中的部分内容摘自 Oracle Corporation 许可的 MySQL 手册。

示例使用免费提供的 » world 或 » sakila 数据库。

- 概述
- 快速入门指南
  - 面向过程和面向对象，两种接口
  - Connections
  - Executing statements
  - Prepared Statements
  - Stored Procedures
  - Multiple Statements
  - API support for transactions
  - Metadata
- 安装/配置
  - 需求
  - 安装
  - 运行时配置
- mysqli 扩展和持久化连接
- 预定义常量
- Notes
- MySQLi 扩展的函数概述
- mysqli — mysqli 类
  - mysqli::$affected_rows — Gets the number of affected rows in a previous MySQL operation
  - mysqli::autocommit — 打开或关闭本次数据库连接的自动命令提交事务模式
  - mysqli::begin_transaction — Starts a transaction
  - mysqli::change_user — Changes the user of the database connection
  - mysqli::character_set_name — 返回当前数据库连接的字符编码
  - mysqli::close — 关闭先前打开的数据库连接
  - mysqli::commit — 提交当前事务
  - mysqli::$connect_errno — Returns the error code from last connect call
  - mysqli::$connect_error — Returns a description of the last connection error
  - mysqli::__construct — Open a new connection to the MySQL server
  - mysqli::debug — Performs debugging operations
  - mysqli::dump_debug_info — 将调试信息输出到日志
  - mysqli::$errno — 返回最近函数调用的错误代码
  - mysqli::$error — Returns a string description of the last error
  - mysqli::$error_list — Returns a list of errors from the last command executed
  - mysqli::execute_query — Prepares, binds parameters, and executes SQL statement
  - mysqli::$field_count — Returns the number of columns for the most recent query
  - mysqli::get_charset — Returns a character set object
  - mysqli::$client_info — 获取 MySQL 客户端信息
  - mysqli::$client_version — 作为整数返回 MySQL 客户端的版本
  - mysqli::get_connection_stats — 返回客户端连接的统计数据
  - mysqli::$host_info — 返回表述使用的连接类型的字符串
  - mysqli::$protocol_version — 返回 MySQL 协议使用的版本号
  - mysqli::$server_info — 返回 MySQL 服务器的版本号
  - mysqli::$server_version — 作为一个整数返回MySQL服务器的版本
  - mysqli::get_warnings — Get result of SHOW WARNINGS
  - mysqli::$info — 返回最近执行的 SQL 语句的信息
  - mysqli::init — 初始化 MySQLi 并返回用于 mysqli_real_connect() 的对象
  - mysqli::$insert_id — 返回上次查询为 AUTO_INCREMENT 列生成的值
  - mysqli::kill — 让服务器杀死一个 MySQL 线程
  - mysqli::more_results — 检查批量查询中是否还有查询结果
  - mysqli::multi_query — 在数据库上执行一个或多个查询
  - mysqli::next_result — 为读取 multi_query 执行之后的下一个结果集做准备
  - mysqli::options — 设置选项
  - mysqli::ping — ping 一个连接，或者如果连接处于断开状态，重新连接
  - mysqli::poll — 轮询连接
  - mysqli::prepare — 预处理执行 SQL
  - mysqli::query — 对数据库执行查询
  - mysqli::real_connect — 建立一个 MySQL 服务器连接
  - mysqli::real_escape_string — 根据当前连接的字符集，对于 SQL 语句中的特殊字符进行转义
  - mysqli::real_query — 执行一个mysql查询
  - mysqli::reap_async_query — 获取异步查询的结果
  - mysqli::refresh — 刷新
  - mysqli::release_savepoint — 从当前事务的保存点中移除一个命名保存点
  - mysqli::rollback — 回滚当前事务
  - mysqli::savepoint — 在当前事务中设置命名保存点
  - mysqli::select_db — 选择用于数据库查询的默认数据库
  - mysqli::set_charset — 设置客户端字符集
  - mysqli::$sqlstate — 返回上一次 MySQL 操作的 SQLSTATE 错误
  - mysqli::ssl_set — 用于使用 SSL 建立安全连接
  - mysqli::stat — 获取当前系统状态信息
  - mysqli::stmt_init — 初始化语句并返回用于 mysqli_stmt_prepare（调用）的对象
  - mysqli::store_result — 传输上次查询的结果集
  - mysqli::$thread_id — 返回当前连接的线程 ID
  - mysqli::thread_safe — 返回是否线程安全
  - mysqli::use_result — Initiate a result set retrieval
  - mysqli::$warning_count — Returns the number of warnings generated by the most recently executed query
- mysqli_stmt — mysqli_stmt 类
  - mysqli_stmt::$affected_rows — Returns the total number of rows changed, deleted, inserted, or matched by the last statement executed
  - mysqli_stmt::attr_get — Used to get the current value of a statement attribute
  - mysqli_stmt::attr_set — Used to modify the behavior of a prepared statement
  - mysqli_stmt::bind_param — Binds variables to a prepared statement as parameters
  - mysqli_stmt::bind_result — Binds variables to a prepared statement for result storage
  - mysqli_stmt::close — Closes a prepared statement
  - mysqli_stmt::__construct — Constructs a new mysqli_stmt object
  - mysqli_stmt::data_seek — Adjusts the result pointer to an arbitrary row in the buffered result
  - mysqli_stmt::$errno — Returns the error code for the most recent statement call
  - mysqli_stmt::$error — Returns a string description for last statement error
  - mysqli_stmt::$error_list — Returns a list of errors from the last statement executed
  - mysqli_stmt::execute — Executes a prepared statement
  - mysqli_stmt::fetch — Fetch results from a prepared statement into the bound variables
  - mysqli_stmt::$field_count — Returns the number of columns in the given statement
  - mysqli_stmt::free_result — Frees stored result memory for the given statement handle
  - mysqli_stmt::get_result — Gets a result set from a prepared statement as a mysqli_result object
  - mysqli_stmt::get_warnings — Get result of SHOW WARNINGS
  - mysqli_stmt::$insert_id — Get the ID generated from the previous INSERT operation
  - mysqli_stmt::more_results — Check if there are more query results from a multiple query
  - mysqli_stmt::next_result — Reads the next result from a multiple query
  - mysqli_stmt::$num_rows — Returns the number of rows fetched from the server
  - mysqli_stmt::$param_count — Returns the number of parameters for the given statement
  - mysqli_stmt::prepare — Prepares an SQL statement for execution
  - mysqli_stmt::reset — Resets a prepared statement
  - mysqli_stmt::result_metadata — Returns result set metadata from a prepared statement
  - mysqli_stmt::send_long_data — Send data in blocks
  - mysqli_stmt::$sqlstate — Returns SQLSTATE error from previous statement operation
  - mysqli_stmt::store_result — Stores a result set in an internal buffer
- mysqli_result — mysqli_result 类
  - mysqli_result::__construct — Constructs a mysqli_result object
  - mysqli_result::$current_field — Get current field offset of a result pointer
  - mysqli_result::data_seek — Adjusts the result pointer to an arbitrary row in the result
  - mysqli_result::fetch_all — Fetch all result rows as an associative array, a numeric array, or both
  - mysqli_result::fetch_array — Fetch the next row of a result set as an associative, a numeric array, or both
  - mysqli_result::fetch_assoc — Fetch the next row of a result set as an associative array
  - mysqli_result::fetch_column — Fetch a single column from the next row of a result set
  - mysqli_result::fetch_field — Returns the next field in the result set
  - mysqli_result::fetch_field_direct — Fetch meta-data for a single field
  - mysqli_result::fetch_fields — Returns an array of objects representing the fields in a result set
  - mysqli_result::fetch_object — Fetch the next row of a result set as an object
  - mysqli_result::fetch_row — Fetch the next row of a result set as an enumerated array
  - mysqli_result::$field_count — Gets the number of fields in the result set
  - mysqli_result::field_seek — Set result pointer to a specified field offset
  - mysqli_result::free — Frees the memory associated with a result
  - mysqli_result::getIterator — Retrieve an external iterator
  - mysqli_result::$lengths — Returns the lengths of the columns of the current row in the result set
  - mysqli_result::$num_rows — Gets the number of rows in the result set
- mysqli_driver — mysqli_driver 类
  - mysqli_driver::embedded_server_end — Stop embedded server
  - mysqli_driver::embedded_server_start — Initialize and start embedded server
  - mysqli_driver::$report_mode — Sets mysqli error reporting mode
- mysqli_warning — mysqli_warning 类
  - mysqli_warning::__construct — Private constructor to disallow direct instantiation
  - mysqli_warning::next — Fetch next warning
- mysqli_sql_exception — mysqli_sql_exception 类
  - mysqli_sql_exception::getSqlState — Returns the SQLSTATE error code
- 别名和过时的 Mysqli 函数
  - mysqli_connect — 别名 mysqli::__construct
  - mysqli::escape_string — 别名 mysqli_real_escape_string
  - mysqli_execute — 别名 mysqli_stmt_execute
  - mysqli_get_client_stats — 返回客户端进程统计信息
  - mysqli_get_links_stats — 返回打开和缓存的链接相关信息
  - mysqli_report — 别名 mysqli_driver->report_mode
  - mysqli::set_opt — 别名 mysqli_options
- 更新日志

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