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php连接mysql数据库用到的三种API_MySQL

程序员文章站 2024-01-07 09:33:10
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参考自php手册。本文没有太大意义,仅为方便自己上网查阅。

1、PHP的MySQL扩展
2、PHP的mysqli扩展
3、PHP数据对象(PDO)

MySQL扩展函数
这是设计开发允许PHP应用与MySQL数据库交互的早期扩展。mysql扩展提供了一个面向过程 的接口,并且是针对MySQL4.1.3或更早版本设计的。因此,这个扩展虽然可以与MySQL4.1.3或更新的数据库服务端 进行交互,但并不支持后期MySQL服务端提供的一些特性。

  • mysql_affected_rows — 取得前一次 MySQL 操作所影响的记录行数
  • mysql_client_encoding — 返回字符集的名称
  • mysql_close — 关闭 MySQL 连接
  • mysql_connect — 打开一个到 MySQL 服务器的连接
  • mysql_create_db — 新建一个 MySQL 数据库
  • mysql_data_seek — 移动内部结果的指针
  • mysql_db_name — 取得结果数据
  • mysql_db_query — 发送一条 MySQL 查询
  • mysql_drop_db — 丢弃(删除)一个 MySQL 数据库
  • mysql_errno — 返回上一个 MySQL 操作中的错误信息的数字编码
  • mysql_error — 返回上一个 MySQL 操作产生的文本错误信息
  • mysql_escape_string — 转义一个字符串用于 mysql_query
  • mysql_fetch_array — 从结果集中取得一行作为关联数组,或数字数组,或二者兼有
  • mysql_fetch_assoc — 从结果集中取得一行作为关联数组
  • mysql_fetch_field — 从结果集中取得列信息并作为对象返回
  • mysql_fetch_lengths — 取得结果集中每个输出的长度
  • mysql_fetch_object — 从结果集中取得一行作为对象
  • mysql_fetch_row — 从结果集中取得一行作为枚举数组
  • mysql_field_flags — 从结果中取得和指定字段关联的标志
  • mysql_field_len — 返回指定字段的长度
  • mysql_field_name — 取得结果中指定字段的字段名
  • mysql_field_seek — 将结果集中的指针设定为制定的字段偏移量
  • mysql_field_table — 取得指定字段所在的表名
  • mysql_field_type — 取得结果集中指定字段的类型
  • mysql_free_result — 释放结果内存
  • mysql_get_client_info — 取得 MySQL 客户端信息
  • mysql_get_host_info — 取得 MySQL 主机信息
  • mysql_get_proto_info — 取得 MySQL 协议信息
  • mysql_get_server_info — 取得 MySQL 服务器信息
  • mysql_info — 取得最近一条查询的信息
  • mysql_insert_id — 取得上一步 INSERT 操作产生的 ID
  • mysql_list_dbs — 列出 MySQL 服务器中所有的数据库
  • mysql_list_fields — 列出 MySQL 结果中的字段
  • mysql_list_processes — 列出 MySQL 进程
  • mysql_list_tables — 列出 MySQL 数据库中的表
  • mysql_num_fields — 取得结果集中字段的数目
  • mysql_num_rows — 取得结果集中行的数目
  • mysql_pconnect — 打开一个到 MySQL 服务器的持久连接
  • mysql_ping — Ping 一个服务器连接,如果没有连接则重新连接
  • mysql_query — 发送一条 MySQL 查询
  • mysql_real_escape_string — 转义 SQL 语句中使用的字符串中的特殊字符,并考虑到连接的当前字符集
  • mysql_result — 取得结果数据
  • mysql_select_db — 选择 MySQL 数据库
  • mysql_set_charset — Sets the client character set
  • mysql_stat — 取得当前系统状态
  • mysql_tablename — 取得表名
  • mysql_thread_id — 返回当前线程的 ID
  • mysql_unbuffered_query — 向 MySQL 发送一条 SQL 查询,并不获取和缓存结果的行

PHP的mysqli扩展
mysqli扩展,我们有时称之为MySQL增强扩展,可以用于使用 MySQL4.1.3或更新版本中新的高级特性。mysqli扩展在PHP 5及以后版本中包含。

面向对象接口
prepared语句支持
多语句执行支持
事务支持
增强的调试能力
嵌入式服务支持
如果你使用MySQL4.1.3或更新版本,强烈建议你使用这个扩展。
MySQLi {

/* 属性 */

int $MySQLi->affected_rows;

string $client_info;

int $client_version;

string $connect_errno;

string $connect_error;

int $errno;

string $error;

int $field_count;

int $client_version;

string $host_info;

string $protocol_version;

string $server_info;

int $server_version;

string $info;

mixed $insert_id;

string $sqlstate;

int $thread_id;

int $warning_count;

/* 方法 */

int mysqli_affected_rows ( mysqli$link )

bool mysqli::autocommit ( bool$mode )

bool mysqli::change_user ( string$user , string$password , string$database )

string mysqli::character_set_name ( void )

string mysqli_get_client_info ( mysqli$link )

int mysqli_get_client_version ( mysqli$link )

bool mysqli::close ( void )

bool mysqli::commit ( void )

int mysqli_connect_errno ( void )

string mysqli_connect_error ( void )

mysqli mysqli_connect ([ string$host = ini_get("mysqli.default_host") [, string$username = ini_get("mysqli.default_user") [, string$passwd = ini_get("mysqli.default_pw") [, string$dbname = "" [, int $port = ini_get("mysqli.default_port") [, string$socket = ini_get("mysqli.default_socket") ]]]]]] )

bool mysqli::debug ( string$message )

bool mysqli::dump_debug_info ( void )

int mysqli_errno ( mysqli$link )

string mysqli_error ( mysqli$link )

int mysqli_field_count ( mysqli$link )

object mysqli::get_charset ( void )

string mysqli::get_client_info ( void )

array mysqli_get_client_stats ( void )

int mysqli_get_client_version ( mysqli$link )

bool mysqli::get_connection_stats ( void )

string mysqli_get_host_info ( mysqli$link )

int mysqli_get_proto_info ( mysqli$link )

string mysqli_get_server_info ( mysqli$link )

int mysqli_get_server_version ( mysqli$link )

mysqli_warning mysqli::get_warnings ( void )

string mysqli_info ( mysqli$link )

mysqli mysqli::init ( void )

mixed mysqli_insert_id ( mysqli$link )

bool mysqli::kill ( int $processid )

bool mysqli::more_results ( void )

bool mysqli::multi_query ( string$query )

bool mysqli::next_result ( void )

bool mysqli::options ( int$option , mixed$value )

bool mysqli::ping ( void )

public int mysqli::poll ( array &$read , array&$error , array&$reject , int $sec [, int $usec ] )

mysqli_stmt mysqli::prepare ( string$query )

mixed mysqli::query ( string$query [, int$resultmode ] )

bool mysqli::real_connect ([ string$host [, string$username [, string$passwd [, string$dbname [, int$port [, string$socket [, int$flags ]]]]]]] )

string mysqli::escape_string ( string$escapestr )

bool mysqli::real_query ( string$query )

public mysqli_result mysqli::reap_async_query ( void )

bool mysqli::rollback ( void )

bool mysqli::select_db ( string$dbname )

bool mysqli::set_charset ( string$charset )

void mysqli_set_local_infile_default ( mysqli$link )

bool mysqli::set_local_infile_handler ( mysqli$link , callback$read_func )

string mysqli_sqlstate ( mysqli$link )

bool mysqli::ssl_set ( string$key , string$cert , string$ca , string$capath , string$cipher )

string mysqli::stat ( void )

mysqli_stmt mysqli::stmt_init ( void )

mysqli_result mysqli::store_result ( void )

int mysqli_thread_id ( mysqli$link )

bool mysqli_thread_safe ( void )

mysqli_result mysqli::use_result ( void )

int mysqli_warning_count ( mysqli$link )

}

Table of Contents

  • mysqli->affected_rows — Gets the number of affected rows in a previous MySQL operation
  • mysqli::autocommit — Turns on or off auto-commiting database modifications
  • mysqli::change_user — Changes the user of the specified database connection
  • mysqli::character_set_name — Returns the default character set for the database connection
  • mysqli->client_info — Returns the MySQL client version as a string
  • mysqli->client_version — Get MySQL client info
  • mysqli::close — Closes a previously opened database connection
  • mysqli::commit — Commits the current transaction
  • mysqli->connect_errno — Returns the error code from last connect call
  • mysqli->connect_error — Returns a string description of the last connect error
  • mysqli::__construct — Open a new connection to the MySQL server
  • mysqli::debug — Performs debugging operations
  • mysqli::dump_debug_info — Dump debugging information into the log
  • mysqli->errno — Returns the error code for the most recent function call
  • mysqli->error — Returns a string description of the last error
  • mysqli->field_count — Returns the number of columns for the most recent query
  • mysqli::get_charset — Returns a character set object
  • mysqli->get_client_info — Returns the MySQL client version as a string
  • mysqli_get_client_stats — Returns client per-process statistics
  • mysqli->client_version — Get MySQL client info
  • mysqli::get_connection_stats — Returns statistics about the client connection
  • mysqli->host_info — Returns a string representing the type of connection used
  • mysqli->protocol_version — Returns the version of the MySQL protocol used
  • mysqli->server_info — Returns the version of the MySQL server
  • mysqli->server_version — Returns the version of the MySQL server as an integer
  • mysqli::get_warnings — Get result of SHOW WARNINGS
  • mysqli->info — Retrieves information about the most recently executed query
  • mysqli::init — Initializes MySQLi and returns a resource for use with mysqli_real_connect()
  • mysqli->insert_id — Returns the auto generated id used in the last query
  • mysqli::kill — Asks the server to kill a MySQL thread
  • mysqli::more_results — Check if there are any more query results from a multi query
  • mysqli::multi_query — Performs a query on the database
  • mysqli::next_result — Prepare next result from multi_query
  • mysqli::options — Set options
  • mysqli::ping — Pings a server connection, or tries to reconnect if the connection has gone down
  • mysqli::poll — Poll connections
  • mysqli::prepare — Prepare an SQL statement for execution
  • mysqli::query — Performs a query on the database
  • mysqli::real_connect — Opens a connection to a mysql server
  • mysqli::real_escape_string — Escapes special characters in a string for use in an SQL statement, taking into account the current charset of the connection
  • mysqli::real_query — Execute an SQL query
  • mysqli::reap_async_query — Get result from async query
  • mysqli::rollback — Rolls back current transaction
  • mysqli::select_db — Selects the default database for database queries
  • mysqli::set_charset — Sets the default client character set
  • mysqli::set_local_infile_default — Unsets user defined handler for load local infile command
  • mysqli::set_local_infile_handler — Set callback function for LOAD DATA LOCAL INFILE command
  • mysqli->sqlstate — Returns the SQLSTATE error from previous MySQL operation
  • mysqli::ssl_set — Used for establishing secure connections using SSL
  • mysqli::stat — Gets the current system status
  • mysqli::stmt_init — Initializes a statement and returns an object for use with mysqli_stmt_prepare
  • mysqli::store_result — Transfers a result set from the last query
  • mysqli->thread_id — Returns the thread ID for the current connection
  • mysqli::thread_safe — Returns whether thread safety is given or not
  • mysqli::use_result — Initiate a result set retrieval
  • mysqli->warning_count — Returns the number of warnings from the last query for the given link



PHP数据对象(PDO)
PHP数据对象,是PHP应用中的一个数据库抽象层规范。PDO提供了一个统一的API接口可以使得你的PHP应用不去关心具体要 连接的数据库服务器系统类型。也就是说,如果你使用PDO的API,可以在任何需要的时候无缝切换数据库服务器,比如从Firebird 到MySQL,仅仅需要修改很少的PHP代码。
当然,PDO也有它自己的先进性,比如一个干净的,简单的,可移植的API,它最主要的缺点是会限制让你不能使用 后期MySQL服务端提供所有的数据库高级特性。比如,PDO不允许使用MySQL支持的多语句执行。
PDO的MySQL驱动并不是一套API,至少从PHP程序员的角度来看是这样的。实际上,PDO的MySQL驱动处于PDO自己的下层, 提供了特定的Mysql功能。程序员直接调用PDO的API,而PDO使用了PDO的MySQL驱动完成与MySQL服务器端的交互。
PDO的MySQL驱动是众多PDO驱动中的一个。其他可用的PDO驱动包括Firebird,PostgreSQL等等。

PDO {

__construct ( string$dsn [, string$username [, string$password [, array$driver_options ]]] )

bool beginTransaction ( void )

bool commit ( void )

mixed errorCode ( void )

array errorInfo ( void )

int exec ( string $statement )

mixed getAttribute ( int $attribute )

array getAvailableDrivers ( void )

bool inTransaction ( void )

string lastInsertId ([ string$name =NULL ] )

PDOStatement prepare ( string$statement [, array$driver_options = array() ] )

PDOStatement query ( string$statement )

string quote ( string $string [, int $parameter_type = PDO::PARAM_STR ] )

bool rollBack ( void )

bool setAttribute ( int $attribute , mixed$value )

}


Table of Contents

  • PDO::beginTransaction — Initiates a transaction
  • PDO::commit — Commits a transaction
  • PDO::__construct — Creates a PDO instance representing a connection to a database
  • PDO::errorCode — Fetch the SQLSTATE associated with the last operation on the database handle
  • PDO::errorInfo — Fetch extended error information associated with the last operation on the database handle
  • PDO::exec — Execute an SQL statement and return the number of affected rows
  • PDO::getAttribute — Retrieve a database connection attribute
  • PDO::getAvailableDrivers — Return an array of available PDO drivers
  • PDO::inTransaction — Checks if inside a transaction
  • PDO::lastInsertId — Returns the ID of the last inserted row or sequence value
  • PDO::prepare — Prepares a statement for execution and returns a statement object
  • PDO::query — Executes an SQL statement, returning a result set as a PDOStatement object
  • PDO::quote — Quotes a string for use in a query.
  • PDO::rollBack — Rolls back a transaction
  • PDO::setAttribute — Set an attribute

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