| 词条 | MySQLi |
| 释义 | mysqli 扩展允许用户访问由 MySQL 4.1 或更高版本所提供的功能。有关 MySQL 数据库服务器的更多信息见 » http://www.mysql.com/。 MySQL 的文档见http://dev.mysql.com/doc/。 经 MySQL AB 授权，本文档中包括部分 MySQL 手册的内容。 需求要使用本扩展库中的函数，必须在编译 PHP 时加入 mysqli 扩展的支持。 Note: mysqli 扩展库是设计用于同 MySQL 4.1.3 或更高版本协同工作的。对之前版本，请参考 MySQL 扩展库文档。 安装要安装 PHP 的 mysqli 扩展，配置时加上 --with-mysqli=mysql_config_path/mysql_config。其中 mysql_config_path 表示 mysql_config 程序的路径，该程序随 MySQL 大于 4.1 版本一起发布。 如果要同时安装 mysql 和 mysqli 扩展，必须使用同一个客户端库以避免冲突。 运行时配置 这些函数的行为受 php.ini 的影响。 MySQLi 配置选项 名称 默认值 可修改范围 更新日志 mysqli.max_links "-1" PHP_INI_SYSTEM 自 PHP 5.0.0 起可用。 mysqli.default_port "3306" PHP_INI_ALL 自 PHP 5.0.0 起可用。 mysqli.default_socket NULL PHP_INI_ALL 自 PHP 5.0.0 起可用。 mysqli.default_host NULL PHP_INI_ALL 自 PHP 5.0.0 起可用。 mysqli.default_user NULL PHP_INI_ALL 自 PHP 5.0.0 起可用。 mysqli.default_pw NULL PHP_INI_ALL 自 PHP 5.0.0 起可用。 以上 PHP_INI_* 常量的进一步细节及定义，见怎样修改配置设定一节。 以下是配置选项的简要解释。 mysqli.max_links integer 每个进程的 MySQL 连接的最大数目。 mysqli.default_port string The default TCP port number to use when connecting to the database server if no other port is specified. If no default is specified, the port will be obtained from the MYSQL_TCP_PORT environment variable, the mysql-tcp entry in /etc/services or the compile-time MYSQL_PORT constant, in that order. Win32 will only use the MYSQL_PORT constant. mysqli.default_socket string The default socket name to use when connecting to a local database server if no other socket name is specified. mysqli.default_host string The default server host to use when connecting to the database server if no other host is specified. Doesn't apply in safe mode. mysqli.default_user string The default user name to use when connecting to the database server if no other name is specified. Doesn't apply in safe mode. mysqli.default_pw string The default password to use when connecting to the database server if no other password is specified. Doesn't apply in safe mode. 预定义类mysqli表达了 PHP 和 MySQL 数据库之间的连接。 构造函数 mysqli - 构造一个新的 mysqli 对象 方法 autocommit - 打开或关闭自动提交的数据库选项 change_user - 改变指定的数据库连接的用户 character_set_name - 返回数据库连接的默认字符集 close - 关闭一个之前打开的连接 commit - 提交当前事务 connect - 打开一个到 MySQL 数据库服务器的新连接 debug - 执行排错操作 dump_debug_info - 取得排错信息 get_client_info - 返回客户端版本 get_host_info - 返回连接使用的类型 get_server_info - 返回 MySQL 服务器的版本 get_server_version - 返回 MySQL 服务器的版本 init - 初始化 mysqli 对象 info - 取得最近执行的查询的信息 kill - 要求服务器停止一个 mysql 线程 multi_query - 执行多个查询 more_results - check if more results exist from currently executed multi-query next_result - reads next result from currently executed multi-query options - set options ping - pings a server connection or reconnects if there is no connection prepare - prepares a SQL query query - performs a query real_connect - attempts to open a connection to MySQL database server escape_string - escapes special characters in a string for use in a SQL statement, taking into account the current charset of the connection rollback - rolls back the current transaction select_db - selects the default database set_charset - sets the default client character set ssl_set - sets ssl parameters stat - gets the current system status stmt_init- initializes a statement for use with mysqli_stmt_prepare store_result - transfers a resultset from last query thread_safe - returns whether thread safety is given or not use_result - transfers an unbuffered resultset from last query 属性 affected_rows - gets the number of affected rows in a previous MySQL operation client_info - returns the MySQL client version as a string client_version - returns the MySQL client version as an integer errno - returns the error code for the most recent function call error - returns the error string for the most recent function call field_count - returns the number of columns for the most recent query host_info - returns a string representing the type of connection used info - retrieves information about the most recently executed query insert_id - returns the auto generated id used in the last query protocol_version - returns the version of the MySQL protocol used server_info - returns a string that represents the server version number server_version - returns the version number of the server as an integer sqlstate - returns a string containing the SQLSTATE error code for the last error thread_id - returns the thread ID for the current connection warning_count - returns the number of warnings generated during execution of the previous SQL statement mysqli_stmt表达了一个预备好的语句。 方法 bind_param - binds variables to a prepared statement bind_result - binds variables to a prepared statement for result storage close - closes a prepared statement data_seek - seeks to an arbitrary row in a statement result set execute - executes a prepared statement fetch - fetches result from a prepared statement into bound variables free_result - frees stored result memory for the given statement handle prepare - prepares a SQL query reset - resets a prepared statement result_metadata - retrieves a resultset from a prepared statement for metadata information send_long_data - sends data in chunks store_result - buffers complete resultset from a prepared statement 属性 affected_rows - returns affected rows from last statement execution errno - returns errorcode for last statement function error - returns errormessage for last statement function field_count - returns the number of columns in a result set id - returns the statement identifier insert_id - returns the value generated for an AUTO_INCREMENT column by the prepared statement num_rows - returns the number of rows in the result set param_count - returns number of parameter for a given prepare statement sqlstate - returns a string containing the SQLSTATE error code for the last statement function mysqli_result表达了对数据库的查询所返回的结果集。 方法 close - closes resultset data_seek - moves internal result pointer fetch_array - fetches a result row as an associative array, a numeric array, or both. fetch_assoc - fetches a result row as an associative array fetch_field - gets column information from a resultset fetch_fields - gets information for all columns from a resulset fetch_field_direct - gets column information for specified column fetch_object - fetches a result row as an object fetch_row - gets a result row as an enumerated array field_seek - set result pointer to a specified field offset free_result - frees result memory 属性 current_field - returns offset of current fieldpointer field_count - returns number of fields in resultset lengths - returns an array of columnlengths num_rows - returns number of rows in resultset type - returns MYSQLI_STORE_RESULT or MYSQLI_USE_RESULT 预定义常量MySQLi 常量 名称 说明 MYSQLI_READ_DEFAULT_GROUP (integer) Read options from the named group from `my.cnf' or the file specified with MYSQLI_READ_DEFAULT_FILE MYSQLI_READ_DEFAULT_FILE (integer) Read options from the named option file instead of from my.cnf MYSQLI_OPT_CONNECT_TIMEOUT (integer) Connect timeout in seconds MYSQLI_OPT_LOCAL_INFILE (integer) Enables command LOAD LOCAL INFILE MYSQLI_INIT_COMMAND (integer) Command to execute when connecting to MySQL server. Will automatically be re-executed when reconnecting. MYSQLI_CLIENT_SSL (integer) Use SSL (encrypted protocol). This option should not be set by application programs; it is set internally in the MySQL client library MYSQLI_CLIENT_COMPRESS (integer) Use compression protocol MYSQLI_CLIENT_INTERACTIVE (integer) Allow interactive_timeout seconds (instead of wait_timeout seconds) of inactivity before closing the connection. The client's session wait_timeout variable will be set to the value of the session interactive_timeout variable. MYSQLI_CLIENT_IGNORE_SPACE (integer) Allow spaces after function names. Makes all functions names reserved words. MYSQLI_CLIENT_NO_SCHEMA (integer) Don't allow the db_name.tbl_name.col_name syntax. MYSQLI_CLIENT_MULTI_QUERIES (integer) MYSQLI_STORE_RESULT (integer) For using buffered resultsets MYSQLI_USE_RESULT (integer) For using unbuffered resultsets MYSQLI_ASSOC (integer) Columns are returned into the array having the fieldname as the array index. MYSQLI_NUM (integer) Columns are returned into the array having an enumerated index. MYSQLI_BOTH (integer) Columns are returned into the array having both a numerical index and the fieldname as the associative index. MYSQLI_NOT_NULL_FLAG (integer) Indicates that a field is defined as NOT NULL MYSQLI_PRI_KEY_FLAG (integer) Field is part of a primary index MYSQLI_UNIQUE_KEY_FLAG (integer) Field is part of a unique index. MYSQLI_MULTIPLE_KEY_FLAG (integer) Field is part of an index. MYSQLI_BLOB_FLAG (integer) Field is defined as BLOB MYSQLI_UNSIGNED_FLAG (integer) Field is defined as UNSIGNED MYSQLI_ZEROFILL_FLAG (integer) Field is defined as ZEROFILL MYSQLI_AUTO_INCREMENT_FLAG (integer) Field is defined as AUTO_INCREMENT MYSQLI_TIMESTAMP_FLAG (integer) Field is defined as TIMESTAMP MYSQLI_SET_FLAG (integer) Field is defined as SET MYSQLI_NUM_FLAG (integer) Field is defined as NUMERIC MYSQLI_PART_KEY_FLAG (integer) Field is part of an multi-index MYSQLI_GROUP_FLAG (integer) Field is part of GROUP BY MYSQLI_TYPE_DECIMAL (integer) Field is defined as DECIMAL MYSQLI_TYPE_NEWDECIMAL (integer) Precision math DECIMAL or NUMERIC field (MySQL 5.0.3 and up) MYSQLI_TYPE_BIT (integer) Field is defined as BIT (MySQL 5.0.3 and up) MYSQLI_TYPE_TINY (integer) Field is defined as TINYINT MYSQLI_TYPE_SHORT (integer) Field is defined as INT MYSQLI_TYPE_LONG (integer) Field is defined as INT MYSQLI_TYPE_FLOAT (integer) Field is defined as FLOAT MYSQLI_TYPE_DOUBLE (integer) Field is defined as DOUBLE MYSQLI_TYPE_NULL (integer) Field is defined as DEFAULT NULL MYSQLI_TYPE_TIMESTAMP (integer) Field is defined as TIMESTAMP MYSQLI_TYPE_LONGLONG (integer) Field is defined as BIGINT MYSQLI_TYPE_INT24 (integer) Field is defined as MEDIUMINT MYSQLI_TYPE_DATE (integer) Field is defined as DATE MYSQLI_TYPE_TIME (integer) Field is defined as TIME MYSQLI_TYPE_DATETIME (integer) Field is defined as DATETIME MYSQLI_TYPE_YEAR (integer) Field is defined as YEAR MYSQLI_TYPE_NEWDATE (integer) Field is defined as DATE MYSQLI_TYPE_ENUM (integer) Field is defined as ENUM MYSQLI_TYPE_SET (integer) Field is defined as SET MYSQLI_TYPE_TINY_BLOB (integer) Field is defined as TINYBLOB MYSQLI_TYPE_MEDIUM_BLOB (integer) Field is defined as MEDIUMBLOB MYSQLI_TYPE_LONG_BLOB (integer) Field is defined as LONGBLOB MYSQLI_TYPE_BLOB (integer) Field is defined as BLOB MYSQLI_TYPE_VAR_STRING (integer) Field is defined as VARCHAR MYSQLI_TYPE_STRING (integer) Field is defined as CHAR MYSQLI_TYPE_GEOMETRY (integer) Field is defined as GEOMETRY MYSQLI_NEED_DATA (integer) More data available for bind variable MYSQLI_NO_DATA (integer) No more data available for bind variable MYSQLI_DATA_TRUNCATED (integer) Data truncation occurred. Available since PHP 5.1.0 and MySQL 5.0.5. 例子在 MySQLI 文档中的所有例子都使用了来自 MySQL AB 的 world 数据库。数据库 world 可以在此地址下载：» http://dev.mysql.com/get/Downloads/Manual/world.sql.gz/from/pick。 |
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