Home php教程 php手册 PDO的使用

PDO的使用

Jun 13, 2016 am 10:35 AM
host localhost mysql new pdo use database of connect

//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 ";
}

//原来插入数据的时候要用mysql_escape_string,现在?
print "Unquoted string: $string ";
print "Quoted string: " . $conn->quote($string) . " ";
//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。

Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

How to open phpmyadmin How to open phpmyadmin Apr 10, 2025 pm 10:51 PM

You can open phpMyAdmin through the following steps: 1. Log in to the website control panel; 2. Find and click the phpMyAdmin icon; 3. Enter MySQL credentials; 4. Click "Login".

MySQL: An Introduction to the World's Most Popular Database MySQL: An Introduction to the World's Most Popular Database Apr 12, 2025 am 12:18 AM

MySQL is an open source relational database management system, mainly used to store and retrieve data quickly and reliably. Its working principle includes client requests, query resolution, execution of queries and return results. Examples of usage include creating tables, inserting and querying data, and advanced features such as JOIN operations. Common errors involve SQL syntax, data types, and permissions, and optimization suggestions include the use of indexes, optimized queries, and partitioning of tables.

Why Use MySQL? Benefits and Advantages Why Use MySQL? Benefits and Advantages Apr 12, 2025 am 12:17 AM

MySQL is chosen for its performance, reliability, ease of use, and community support. 1.MySQL provides efficient data storage and retrieval functions, supporting multiple data types and advanced query operations. 2. Adopt client-server architecture and multiple storage engines to support transaction and query optimization. 3. Easy to use, supports a variety of operating systems and programming languages. 4. Have strong community support and provide rich resources and solutions.

How to use single threaded redis How to use single threaded redis Apr 10, 2025 pm 07:12 PM

Redis uses a single threaded architecture to provide high performance, simplicity, and consistency. It utilizes I/O multiplexing, event loops, non-blocking I/O, and shared memory to improve concurrency, but with limitations of concurrency limitations, single point of failure, and unsuitable for write-intensive workloads.

MySQL and SQL: Essential Skills for Developers MySQL and SQL: Essential Skills for Developers Apr 10, 2025 am 09:30 AM

MySQL and SQL are essential skills for developers. 1.MySQL is an open source relational database management system, and SQL is the standard language used to manage and operate databases. 2.MySQL supports multiple storage engines through efficient data storage and retrieval functions, and SQL completes complex data operations through simple statements. 3. Examples of usage include basic queries and advanced queries, such as filtering and sorting by condition. 4. Common errors include syntax errors and performance issues, which can be optimized by checking SQL statements and using EXPLAIN commands. 5. Performance optimization techniques include using indexes, avoiding full table scanning, optimizing JOIN operations and improving code readability.

MySQL's Place: Databases and Programming MySQL's Place: Databases and Programming Apr 13, 2025 am 12:18 AM

MySQL's position in databases and programming is very important. It is an open source relational database management system that is widely used in various application scenarios. 1) MySQL provides efficient data storage, organization and retrieval functions, supporting Web, mobile and enterprise-level systems. 2) It uses a client-server architecture, supports multiple storage engines and index optimization. 3) Basic usages include creating tables and inserting data, and advanced usages involve multi-table JOINs and complex queries. 4) Frequently asked questions such as SQL syntax errors and performance issues can be debugged through the EXPLAIN command and slow query log. 5) Performance optimization methods include rational use of indexes, optimized query and use of caches. Best practices include using transactions and PreparedStatemen

Monitor Redis Droplet with Redis Exporter Service Monitor Redis Droplet with Redis Exporter Service Apr 10, 2025 pm 01:36 PM

Effective monitoring of Redis databases is critical to maintaining optimal performance, identifying potential bottlenecks, and ensuring overall system reliability. Redis Exporter Service is a powerful utility designed to monitor Redis databases using Prometheus. This tutorial will guide you through the complete setup and configuration of Redis Exporter Service, ensuring you seamlessly build monitoring solutions. By studying this tutorial, you will achieve fully operational monitoring settings

How to view sql database error How to view sql database error Apr 10, 2025 pm 12:09 PM

The methods for viewing SQL database errors are: 1. View error messages directly; 2. Use SHOW ERRORS and SHOW WARNINGS commands; 3. Access the error log; 4. Use error codes to find the cause of the error; 5. Check the database connection and query syntax; 6. Use debugging tools.

See all articles