PHP杂记
mysql常用命令
1、mysql -uroot -padmin --登录,用户名:root,密码:admin(自己设的)
2、show databases;显示数据库
PHP程序访问数据库
PHP程序访问数据库,完全可以使用存储过程,有人认为使用存储过程便于维护
不过仁者见仁,智者见智,在这个问题上,偶认为使用存储过程意味着必须要DBA和开发人员更紧密配合,如果其中一方更变,则显然难以维护。
但是使用存储过程至少有两个最明显的优点:速度和效率。
使用存储过程的速度显然更快。
在效率上,如果应用一次需要做一系列SQL操作,则需要往返于PHP与ORACLE,不如把该应用直接放到数据库方以减少往返次数,增加效率。
但是在INTERNET应用上,速度是极度重要的,所以很有必要使用存储过程。
偶也是使用PHP调用存储过程不久,做了下面这个列子。
代码:--------------------------------------------------------------------------------
//建立一个TEST表
CREATE TABLE TEST (
ID NUMBER(16) NOT NULL,
NAME VARCHAR2(30) NOT NULL,
PRIMARY KEY (ID)
);
//插入一条数据
INSERT INTO TEST VALUES (5, 'PHP_BOOK');
//建立一个存储过程
CREATE OR REPLACE PROCEDURE PROC_TEST (
p_id IN OUT NUMBER,
p_name OUT VARCHAR2
) AS
BEGIN
SELECT NAME INTO p_name
FROM TEST
WHERE ID = 5;
END PROC_TEST;
/
--------------------------------------------------------------------------------
PHP代码:--------------------------------------------------------------------------------
//建立数据库连接
$user = "scott"; //数据库用户名
$password = "tiger"; //密码
$conn_str = "tnsname"; //连接串(cstr : Connection_STRing)
$remote = true //是否远程连接
if ($remote) {
$conn = OCILogon($user, $password, $conn_str);
}
else {
$conn = OCILogon($user, $password);
}
//设定绑定
$id = 5; //准备用以绑定的php变量 id
$name = ""; //准备用以绑定的php变量 name
/** 调用存储过程的sql语句(sql_sp : SQL_StoreProcedure)
* 语法:
* BEGIN 存储过程名([[:]参数]); END;
* 加上冒号表示该参数是一个位置
**/
$sql_sp = "BEGIN PROC_TEST(:id, :name); END;";
//Parse
$stmt = OCIParse($conn, $sql_sp);
//执行绑定
OCIBindByName($stmt, ":id", $id, 16); //参数说明:绑定php变量$id到位置:id,并设定绑定长度16位
OCIBindByName($stmt, ":name", $name, 30);
//Execute
OCIExecute($stmt);
//结果
echo "name is : $name
";
?>
php连接mysql数据库
对于熟悉做网站的人来说,要想网站做成动态的,肯定要有数据库的支持,利用特定的脚本连接到数据库,从数据库中提取资料、向数据库中添加资料、删除资料等。这里我通过一个实例来说明如何用php连接到数据库的。
我准备建立一个简单的通讯录,数据库的名字叫txl,数据库只有一个表叫personal_info,表中有5个字段
pi_id pi_name pi_tel pi_qq pi_email
首先我们要创建数据库:
create database txl;
然后我们建立表
CREATE TABLE `personal_info` (
`pi_id` bigint(20) NOT NULL auto_increment,
`pi_name` varchar(50) NOT NULL,
`pi_tel` varchar(15) default NULL,
`pi_qq` varchar(15) default NULL,
`pi_email` varchar(50) default NULL,
PRIMARY KEY (`pi_id`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8 AUTO_INCREMENT=4 ;
上面的sql语句很简单,通过字面都能猜出什么意思。
下面是连接到数据库并且显示表personal_info的所有字段信息:
// connsql.php
$mysql_server_name="localhost"; //数据库服务器名称
$mysql_username="root"; // 连接数据库用户名
$mysql_password="root"; // 连接数据库密码
$mysql_database="lxr"; // 数据库的名字
// 连接到数据库
$conn=mysql_connect($mysql_server_name, $mysql_username,
$mysql_password);
// 从表中提取信息的sql语句
$strsql="select * from personal_info";
// 执行sql查询
$result=mysql_db_query($mysql_database, $strsql, $conn);
// 获取查询结果
$row=mysql_fetch_row($result);
echo '';
echo '';
\n";
// 显示字段名称
echo "\n\n"; \n";
for ($i=0; $i
echo ''. \n";
mysql_field_name($result, $i);
echo "
}
echo "
// 定位到第一条记录
mysql_data_seek($result, 0);
// 循环取出记录
while ($row=mysql_fetch_row($result))
{
echo "\n"; \n";
for ($i=0; $i
echo ''; ';
echo "$row[$i]";
echo '
}
echo "
}
echo "
echo "";
// 释放资源
mysql_free_result($result);
// 关闭连接
mysql_close();
?>
下面是运行结果:
pi_id pi_name pi_tel pi_qq pi_email
1 Zhangsan
13911111111 642864125 zhangsan@126.com
2 Lisi
13122222222 63958741 lisi@163.com
3 Wangwu
13833333333 912345678 wangwu@sohu.com
所谓“万变不离其宗”,再复杂的操作也都是基于上面的来的,都少不了上面的基本的步骤,当需要时查一下相关的手册便可以解决。

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