php教程|php手册
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php教程-php手册
在学习1. 开启PHP的API支持
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(1)首先修改您的php.ini的配置文件。
查找下面的语句:
;extension=php_mysqli.dll
将其修改为:
extension=php_mysqli.dll
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(2)重新启动Apache/IIS,即可。
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(3)说明:PHP需要单独的文件来支持这个扩展库,一般在PHP目录下的ext目录里能找到php_mysqli.dll文件(PHP <= 5.0.2 中是 libmysqli.dll),当然,在PHP的配置文件当中要有正确指向ext的信息(extension_dir)。假若您的PHP没有这个文件,您可以去下载PHP5的源码包。另外,这个API扩展,只能在PHP5以上版本使用。其它具体信息,请看下面。
2.PHP mysqli身份证
mysqli是“MySQL, Improved”的缩写,该扩展仅适用于PHP 5。它能用于MySQL 4.1.1和更高版本。该扩展完全支持MySQL 5.1中采用的鉴定协议,也支持预处理语句和多语句API。此外,该扩展还提供了先进的、面向对象的编程接口。
3. mysqli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PHP 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PHP 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
4. 基本语法
<?php/* Connect to a MySQL server 连接数据库服务器 */ $link = mysqli_connect( ‘localhost’, /* The host to connect to 连接MySQL地址 */ ‘user’,/* The user to connect as 连接MySQL用户名 */ ‘password’, /* The password to use 连接MySQL密码 */ ‘world’); /* The default database to query 连接数据库名称*/ if (!$link) {printf(“Can’t connect to MySQL Server. Errorcode: %s “, mysqli_connect_error());exit; } /* Send a query to the server 向服务器发送查询请求*/ if ($result = mysqli_query($link, ‘SELECT Name, Population FROM City ORDER BY Population DESC LIMIT 5’)) { print(“Very large cities are: “); /* Fetch the results of the query 返回查询的结果 */ while( $row = mysqli_fetch_assoc($result) ){printf(“%s (%s) “, $row[‘Name’], $row[‘Population’]); } /* Destroy the result set and free the memory used for it 结束查询释放内存 */ mysqli_free_result($result); } /* Close the connection 关闭连接*/ mysqli_close($link);?>
以上所描写的解决办法能够帮助我们轻松解决PHP mysqli连接数据库的问题。