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PDO的使用

来源:互联网  宽屏版  评论
2008-12-22 08:10:28

//首先要连接mysql数据库

$dbh = new PDO('mysql:host=localhost;dbname=test', $user, $pass);

//如果你想连mssql:

//mssql:host=localhost;dbname=testdb

//连pgsql:

//pgsql:host=localhost port=5432 dbname=testdb user=bruce password=mypass

//连odbc(DSN)

//odbc:testdb

//连access:

//odbc:Driver={Microsoft Access Driver (*.mdb)};Dbq=C:\\db.mdb;Uid=Admin

//还有oracle,sqlite,db2....

//执行个查询

foreach ($dbh->query('SELECT * from FOO') as $row) {

print_r($row); //这个结果和mysql_fetch_array差不多。PDOStatement::setFetchMode 可以调整。

}

//另外还可以:

$sth = $dbh->prepare("SELECT name, colour FROM fruit");

$sth->execute();

//将整个记录集读到数组里:

$result = $sth->fetchAll();

print_r($result);

//输出:

Array

(

[0] => Array

(

[NAME] => pear

[0] => pear

[COLOUR] => green

[1] => green

)

[1] => Array

(

[NAME] => watermelon

[0] => watermelon

[COLOUR] => pink

[1] => pink

)

)

//插入 / 删 / 更新数据:

$count = $dbh->exec("DELETE FROM fruit WHERE colour = 'red'");

//$count就是删除的条数。相当于mysql_affected_rows

//也可用PDOStatement::rowCount

//偶忘了偶用啥数据库了。。。。

if ($db->getAttribute(PDO::ATTR_DRIVER_NAME) == 'mysql') {

echo "Running on mysql; doing something mysql specific here\n";

}

//原来插入数据的时候要用mysql_escape_string,现在?

print "Unquoted string: $string\n";

print "Quoted string: " . $conn->quote($string) . "\n";

//得到:

Unquoted string: Nice

Quoted string: 'Nice'

//你看现在连引号都自动加了。。。。

//注意在不同的数据库中结果不同,比如有的' => '',有的' => \',\ => \//现在没顾虑了,全自动。

//最后偶要关闭它了

$conn = null;

//但是!你可以保持连接:

$dbh = new PDO('odbc:SAMPLE', 'db2inst1', 'ibmdb2',

array(PDO_ATTR_PERSISTENT => true));

//很简单的不是?

附:特别简单的特殊调用方法:

$stmt = $dbh->prepare("SELECT * FROM REGISTRY where name = ?");

if ($stmt->execute(array($_GET['name']))) { //你怕啥?自动quote!

while ($row = $stmt->fetch()) {

print_r($row);

}

}

也可以:

$stmt->bindParam(1, $id);

$stmt->bindParam(2, $_FILES['file']['type']);

$stmt->bindParam(3, $fp, PDO::PARAM_LOB);

这么好的功能,哪里可以找到?php5.1以上在扩展里,php5在pecl里,php4?你别想了,没有。

//首先要连接mysql数据库 $dbh = new PDO('mysql:host=localhost;dbname=test', $user, $pass); //如果你想连mssql: //mssql:host=localhost;dbname=testdb //连pgsql: //pgsql:host=localhost port=5432 dbname=testdb user=bruce password=mypass //连odbc(DSN) //odbc:testdb //连access: //odbc:Driver={Microsoft Access Driver (*.mdb)};Dbq=C:\\db.mdb;Uid=Admin //还有oracle,sqlite,db2.... //执行个查询 foreach ($dbh->query('SELECT * from FOO') as $row) { print_r($row); //这个结果和mysql_fetch_array差不多。PDOStatement::setFetchMode 可以调整。 } //另外还可以: $sth = $dbh->prepare("SELECT name, colour FROM fruit"); $sth->execute(); //将整个记录集读到数组里: $result = $sth->fetchAll(); print_r($result); //输出: Array ( [0] => Array ( [NAME] => pear [0] => pear [COLOUR] => green [1] => green ) [1] => Array ( [NAME] => watermelon [0] => watermelon [COLOUR] => pink [1] => pink ) ) //插入 / 删 / 更新数据: $count = $dbh->exec("DELETE FROM fruit WHERE colour = 'red'"); //$count就是删除的条数。相当于mysql_affected_rows //也可用PDOStatement::rowCount //偶忘了偶用啥数据库了。。。。 if ($db->getAttribute(PDO::ATTR_DRIVER_NAME) == 'mysql') { echo "Running on mysql; doing something mysql specific here\n"; } //原来插入数据的时候要用mysql_escape_string,现在? print "Unquoted string: $string\n"; print "Quoted string: " . $conn->quote($string) . "\n"; //得到: Unquoted string: Nice Quoted string: 'Nice' //你看现在连引号都自动加了。。。。 //注意在不同的数据库中结果不同,比如有的' => '',有的' => \',\ => \//现在没顾虑了,全自动。 //最后偶要关闭它了 $conn = null; //但是!你可以保持连接: $dbh = new PDO('odbc:SAMPLE', 'db2inst1', 'ibmdb2', array(PDO_ATTR_PERSISTENT => true)); //很简单的不是? 附:特别简单的特殊调用方法: $stmt = $dbh->prepare("SELECT * FROM REGISTRY where name = ?"); if ($stmt->execute(array($_GET['name']))) { //你怕啥?自动quote! while ($row = $stmt->fetch()) { print_r($row); } } 也可以: $stmt->bindParam(1, $id); $stmt->bindParam(2, $_FILES['file']['type']); $stmt->bindParam(3, $fp, PDO::PARAM_LOB); 这么好的功能,哪里可以找到?php5.1以上在扩展里,php5在pecl里,php4?你别想了,没有。
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