PHP中MySQL操作
本次使用的demo是MySQL的示例数据库employees,点击下载地址,注意在导入的时候,在employees.sql文件中,将source改成你当前的目录。
PHP中的demo代码可以在ideone下载到。
这里使用的是mysqli的方式,其他还有mysql和pdo方式,官方有篇比较的3者区别的文章《Overview》。
一、连接数据库
1.1、连接
打开一个到 MySQL 服务器的连接。有面向对象风格和过程化风格。
$link = mysqli_connect("localhost", "root", "123456", "employees");//面向过程
$link = new mysqli("localhost", "root", "123456", "employees");//面向对象
如果成功则返回一个 MySQL 连接对象, 或者在失败时返回 FALSE。
1.2、设置编码
set_charset与query。query在下面就会有讲到,这里的话其实就是执行一条语句“SET NAMES utf8”。
设置在数据库间传输字符时所用的默认字符编码。
$link->query("SET NAMES utf8");//执行语句 mysqli_set_charset($link, 'utf8');//面向过程
$link->set_charset('utf8');//面向对象
成功时返回 TRUE, 或者在失败时返回 FALSE。
二、查询
2.1、对数据库执行一次查询
mysqli_query与query。返回的信息中并没有记录信息,需要再使用方法获取。
$sql = 'select * from employees limit 10';
$result = mysqli_query($link, $sql);//面向过程
$result = $link->query($sql);//面向对象
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失败时返回 FALSE,成功执行SELECT, SHOW, DESCRIBE或 EXPLAIN查询会返回一个mysqli_result 对象,其他查询则返回TRUE。
接下来的2和3就是根据mysqli_result对象来的。
还有就是下面的所有方法都有面向过程和面向对象的方式,为了节省篇幅,下面例子都是面向对象的方式。
2.2、查询记录获取
fetch_all、fetch_array、fetch_assoc与fetch_row,返回的是array。
fetch_fields、fetch_field、fetch_object与fetch_field_direct,返回是stdClass Object。
重置指针到起始,当做fetch_fields、fetch_assoc等读取数据的时候,指针会变化。
返回记录数组,这个方法有可以传递一个参数resulttype,三个常量MYSQLI_ASSOC, MYSQLI_NUM, or MYSQLI_BOTH。默认是MYSQLI_NUM。
$data = $result->fetch_all(MYSQLI_ASSOC);
获取所有结果行并返回结果集作为关联数组,数字数组,或两者兼而有之。
下面的第一张返回结果图,引用的参数是MYSQLI_ASSOC,第二张引用的参数是MYSQLI_NUM。其实就是key的不同。
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返回一条记录数组,或没有记录返回NULL。与fetch_all一样,也有个参数resulttype,三个常量供选择。默认是MYSQLI_BOTH。
$data = $result->fetch_array(MYSQLI_ASSOC);
aaarticlea/png;base64,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" alt="" />aaarticlea/png;base64,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" alt="" />
没有resulttype参数,返回的是一条关联数组,或者没记录返回NULL。如果数组中包含相同的键名,那么将取最后一列。
aaarticlea/png;base64,iVBORw0KGgoAAAANSUhEUgAAANcAAACGCAIAAADBzYiwAAAHWUlEQVR4nO2dW5rkJgyFa/9b6k1lB85DehwGSUdCNha4zv8wn5tCF+BYtHFX8vnnDz8/PwchFXyoQlJOSIWfz+fJnMi3QRWSenwV/idBCpHMI6PCz+dzNloXbc/2I3lNSLIWSg2pLcAJJUhOQirECrNaVHPu70TiqNCqXkEVduI7qEKiMVGFcVvy5SAVus8WbYWzNm618/Rhka14+t0JJUgkz6mQpzPEgu+RST1UIamHKiT1DKiQv9KRSURVSAmSeVCFpB7+fSGphyok9VCFpB6qkNRDFZJ6+IxM6qEKST18d0Lq4XtkUg9VSOqhCkk9VCGpp0CFK/zp/wo5kJMaFT4TyCWRyZCJ+u3YTv34u4sXs90FqnCWFZaR/K8DqN+U7b5rm8h2C6jCiYY3qjAedEeWUGG7AVlfpJeNqufWieofZ6Jmld4fqcIg9Sq01qZbp+B6dNrFhhfX1TWnCoMsocKu3lxUYXc9SYWshTeyhArVDuUqBDtyUBBUYZC1VLhFLYxbUYVB6lV4aE8nR7NO7UVXk4Af1dbNJJF8MBmr8Uq317DNu5N7F+Ddi7ode7xHBrWBenoBe6iQvBuqkNRDFZJ6tnk6WZn3jehhik9qwOLljlESj953qWfquY/aWT2ZSp/y3GgYt/3tXH5eeEUE6sJcd5JzmBtIdJ20Ze6uVVeym5uG9DZkGLf9vw9VWKvCuGFOhcFAVGG/iYAK3/VXN5G2M04DxwUhVP+umi2Hrq3axxq1lZubnvQWSc/tto0K3euzxV28TkaRHPCkB7PF4SJEbhv1x3PIEUFYNwOYkNa/tHWXDA/qt9teKhxqSdzBspbIbK2Sc0WFoYJh33LB5R+dEOAfG7rheidUoawHuZnFk24VIdcwHtr1mRNTznDonqQKi3fkgYJh78ggt+sT4t5dOGiEJVTYlQe1ZoB9UPaRH6lpdD5BrZI/DhUMkEO8ZySNeKMbImiFc4t64LuT67xvRA/z8vfIH0F1RkTh5SokW0AVknqoQlIPn05u4H0jepj6k5qzUT7tP5PPXTx8UjODqjlfQoXtGdUM/8+Qixs8kLsSYn3WUuEk/8+QjosN36q8liX+1jpyan+2qD3bj9zNS3Ul41reLP+umEB6OFvXp9tywHkDg3qGdWuh2q2bX/ca5NAugOWh/Qh0i8fFKaXbcW7WvI3eSPPYTIWyJTeVeMGwChP1bCgf6yOrerXVzh3gQRX+hrxPhWp7WoXWhVULg+mdn1oKdg3d60TP4Jw/w8YqjE86dg4KCVbhLbVwKFs85NFamEtmBvUqlOVBrRmRls4nSED6kXHbdrUbHldiKnBPa5id4KwWPG/qnD8G353cwF4j+thlsoqXv0dWaxtZbTZerkKyBVQhqYcqJPXw6WSMrZNfloVOap6Jfgu5bCNWtz9ORU5zyqlXIWjMuXqAdNygEK8HcuNShd+rwojtjEFRhSJkQIXqriF3K3dzOT8F3qTnSCZ4gDg911x2cycEdFMjqi14MuexogrVa7cRhJP9pTf5bySrNO6do6YdGYLq31XhvaMbZUUVni3drTlak2QfUOcsFaol7eI6JWrhISYEzFhkoqjC0I5sdR6dr2CVdWuhO4T20yFBRJzLlFxh4Y+owqd35Ig3V4W3rNNowiC0NQTVCVUoQsJnDqsRlBZcA6RbNUSnQtkNDCE38EjCsh3nBlrUmcS2j8F3J2NsnfyyvOo9slreyPq8SoVkU6hCUg9VSOr50qeTFXIgJ/UnNbc4nHd0kjBRj0US6X0Pb1Bh2uc8q06FiShfBVU4JRxVOMQSKpQnfOqPh1hU9WgwaKtmYmWVs1WDEkm9Clu5yA5STGej1Q3bgkxGAeZthlShy6IqVKtjZwIEB2xBJldGoX5KFQapV+Gh7bPYKlgLsUPQ3mal7siusKjCIepVqIpSXidUOKkWRqyowiGWUKFabLotVf54iHKFbbHcc8lbfToVUoiY+ncnQzvdpBxILUu8R6YmvpwlVEi+HKqQ1EMVknrqn072Yuvkl2WJ//eT2+2uuHf5nHfQaHVW1R9vlM6to6uc7cWbc4nzwmfiurHimeSnO2bYrah6jRtBoCHPEduIIYYqzGRyJee4EPG1bLziOW17y/KtosL27gc1P9JTjSh7ti2fv1FtwRBAODW9yMq5KjyEDuT8xD0HbaWfhKHiagUVgvvb6ul2xt2C9SARLkjkzlEztG6kQ5tJ9X5wPUsrMDPW8g2xhArda8sQTFPEp1xFaauGuKjCiLma6vH38nedb78thzxEDE2HW6twNBxeADdiMDQuJIm01fYqFQaXb4iXqPCWSccR75nuwd+6QIYlKoxP0RBLnBe2c2EVErW0qMVGjYgddo2qrTWE3MCDCYMc1PbRCXEbLcNIenH47mSMrZNflle9R/4IqjMiIV6lQrIpVCGphyok9Tgq5K9W5AH8WkghktlQhaSe0O+FFCKZClVI6qEKST1UIamHKiT18BmZ1EMVknr47oTUw/fIpB6qkNTzLzDKL+omHQydAAAAAElFTkSuQmCC" alt="" />
同样没有resulttype参数,返回的是一条数字数组,或者没有记录返回NULL。
aaarticlea/png;base64,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" alt="" />
用此方法获取表中所有的字段信息,包括字段名、字段长度、所属表等。
返回多个对象的数组,如果没有就返回FALSE。
aaarticlea/png;base64,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" alt="" />
与上面的方法相对,只会获取某一个字段信息。配合field_seek,可以根据需要获得某个位置的字段信息。
返回一个对象的数组,如果没有就返回FALSE。
$result->field_seek(1);
$fields = $result->fetch_field();
注意上面的代码,返回的将是第二个字段的信息。
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可以传入两个参数class_name和params,返回一个关联对象,如果没有数据返回NULL。
aaarticlea/png;base64,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" alt="" />
可以传入一个参数fieldnr,也就是字段的位置。效果等效于上面的fetch_field与field_seek的配合。
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2.3、插入更新等信息获取
employees表的主键原先不是自增长的,我后面改了下字段,目前表中有499999条数据。
$sql = "insert into employees(`birth_date`,`first_name`,`last_name`,`gender`,`hire_date`) values ('1988-10-9', 'pw', 'strick', 'M', '1988-10-9')";
$result = $link->query($sql);
var_dump($link->affected_rows);//受影响行数
var_dump($link->insert_id);//主键
//print_r(mysqli_error($link));//打印错误信息
上面的$result返回的将是一个boolean值,而主键和影响行数是需要从mysqli对象中获取。
三、预处理
3.1、添加更新等操作
预处理能有效的防止sql注入的产生,mysqli_stmt是预处理类。
$sql = "insert into employees(`birth_date`,`first_name`,`last_name`,`gender`,`hire_date`) values (?,?,?,?,?)";
$stmt = $link->prepare($sql);//获得预处理对象//bind_param中的第N个参数,必须得用变量赋值
$birth_date = '1989-10-9';$first_name = 'pw2';$last_name = 'strick2';$gender = 'M';$hire_date = '1988-10-9';
$stmt->bind_param('sssss', $birth_date, $first_name, $last_name, $gender, $hire_date);//绑定时使用变量绑定
//$stmt->bind_param('sssss', '1989-10-9', 'pw2', 'strick2', 'M', '1988-10-9');//不能使用这种方式
$stmt->execute();//执行预处理 var_dump($stmt->insert_id);//主键
var_dump($stmt->affected_rows);//受影响行数
初始化一个预处理对象,传入string类型的查询语句。返回一个mysqli_stmt对象,失败则返回FALSE。
绑定预处理查询语句中的变量。第一个参数是指定数据类型。
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" alt="" />
3.2、查询
$sql = 'select * from employees limit ?';
$stmt = $link->prepare($sql);
$count = 10;
$stmt->bind_param("i", $count);
$stmt->execute();
$result = $stmt->get_result();//结果集取后的操作就和之前一样了
与上面不同的就是要先prepare和bind_param,然后execute,最后是get_result获取一个mysqli_result对象,接下来就是和上面的操作一样了。
demo数据库下载:
http://download.csdn.net/detail/loneleaf1/9271903
demo代码下载:
参考资料:
http://segmentfault.com/a/1190000003841357 PHP mysqli 操作数据库
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