How to use php to manipulate mysqli database
This article mainly introduces the method of manipulating the mysqli database in PHP. Interested friends can refer to it. I hope it will be helpful to everyone.
Mysql(i) support has been added since php5.0, and the newly added functions are added in the form of objects
i means improved functions, high efficiency and stability
Compile time parameters:
./configure --with-mysql=/usr/bin/mysql_config \ #使用 Mysql ClientLibrary(libmysql)构建 --with-mysqli=mysqlnd \ #使用 Mysql Native Dirver 即mysqlnd --with-pdo-mysql=mysqlnd #使用 Mysql Native Dirver 即mysqlnd
Due to copyright issues, starting from php5.3, php will use mysqlnd instead of libmysql.dll
mysqlnd is a mysql database driver developed by zend company. Compared with the original, it has improved in all aspects
#Compile using mysqlnd
./configure --with-mysql=mysqlnd --with-mysqli=mysqlnd --with-pdo-mysql=mysqlnd 加上你的参数
mysqli process , object mode all support the three classes provided by
mysqli:
1, mysqli and connection related
2 , MySQLi_Result processing result set
3, mysqli_stmt preprocessing class
#Set character set
set_charset
#Get character set
character_set_name
Get the database object
//创建mysqli对象方式 1 //屏蔽连接产生的错误 $mysqli = new mysqli('127.0.0.1', 'root', '', 'test'); //只能用函数来判断是否连接成功 if(mysqli_connect_errno()) { echo mysqli_connect_error(); } //创建mysqli对象方式 2 可以设置一些参数 $mysqli = mysqli_init(); $mysqli->options(MYSQLI_OPT_CONNECT_TIMEOUT, 2);//设置超时时间 $mysqli->real_connect('127.0.0.1', 'root', '', 'test');
query: returns false on failure, select returns the result set object successfully, and other returns true if not false, which means that the sql execution is successful
No result set example
$mysqli = mysqli_init(); $mysqli->options(MYSQLI_OPT_CONNECT_TIMEOUT, 2);//设置超时时间 $mysqli->real_connect('127.0.0.1', 'root', '', 'test'); $sql = "insert into limove(`name`, `order`) values('aa', 11)"; $rst = $mysqli->query($sql); $sql = "delete from limove where id = 221"; $rst = $mysqli->query($sql); if($rst === false) { ee($mysqli->errno); ee($mysqli->error); } #影响条数 ee($mysqli->affected_rows); #插入的id ee($mysqli->insert_id); ee($mysqli);
There is a result set
$mysqli = mysqli_init(); $mysqli->options(MYSQLI_OPT_CONNECT_TIMEOUT, 2);//设置超时时间 $mysqli->real_connect('127.0.0.1', 'root', '', 'test'); $sql = "select * from limove as limove_as"; $result = $mysqli->query($sql); if($result === false) { ee($mysqli->errno); ee($mysqli->error); } #行数 ee($result->num_rows); #列数 ee($result->field_count); #字段个数 ee($result->field_count); #获取所有字段的信息 $field_arr = $result->fetch_fields(); #移动字段的指针 // $result->field_seek(1); #依次获取字段的信息 while($field = $result->fetch_field()) { ee($field); } #移动记录指针 $result->data_seek(1); #一次获取所有数据 $data = $result->fetch_all(MYSQLI_ASSOC); #关联数组方式获取结果集 $data = array(); $result->data_seek(0); #重置指针到起始 while($row = $result->fetch_assoc()) { $data[] = $row; } ee($data); $result->free(); $mysqli->close();
Execute multiple statements multiquery at one time (not recommended)
No result set, at this time affected_rows can only get the number of the last affected rows
$mysqli = mysqli_init(); $mysqli->options(MYSQLI_OPT_CONNECT_TIMEOUT, 2);//设置超时时间 $mysqli->real_connect('127.0.0.1', 'root', '', 'test'); $sql_arr = array( 'insert into limove(id,`name`, `order`) values(null, 1, 2)', 'insert into limove(id,`name`, `order`) values(null, 1, 222)', 'delete from limove where `order` = 2', ); $sql = implode(';', $sql_arr); $result = $mysqli->multi_query($sql); if($result === false) { ee($mysqli->errno); ee($mysqli->error); } $mysqli->close();
There is a result set
$mysqli = mysqli_init(); $mysqli->options(MYSQLI_OPT_CONNECT_TIMEOUT, 2);//设置超时时间 $mysqli->real_connect('127.0.0.1', 'root', '', 'test'); $sql_arr = array( 'show tables', 'desc select * from limove', 'show create table limove', ); $sql = implode(';', $sql_arr); $rst = $mysqli->multi_query($sql); if($rst === false) { ee($mysqli->errno); ee($mysqli->error); } do{ $result = $mysqli->store_result();#获取当前光标所在的结果集 $data = $result->fetch_all(); ee($data); }while($mysqli->next_result());#光标移动到下一个结果集 $mysqli->close();
Transaction processing:
$mysqli=new mysqli("localhost", "root", "123456", "xsphpdb"); //事务处理 $mysqli->autocommit(0); $error=true; $price=50; $sql="update zh set ye=ye-{$price} where name='zhangsan'"; $result=$mysqli->query($sql); if(!$result){ $error=false; echo "从张三转出失败 "; }else{ if($mysqli->affected_rows==0){ $error=false; echo "张三的钱没有变化"; }else{ echo "从张三账号中转出成功! "; } } $sql="update zh set ye=ye+{$price} where name='lisi1'"; $result=$mysqli->query($sql); if(!$result){ $error=false; echo "从李四转入失败 "; }else{ if($mysqli->affected_rows==0){ $error=false; echo "李四的钱没有变化"; }else{ echo "向李四账号中转入成功! "; } } if($error){ echo "转账成功!"; $mysqli->commit(); }else{ echo "转账失败!"; $mysqli->rollback(); } $mysqli->autocommit(1); $mysqli->close();
mysqli_stmt: mysqli preprocessing class (recommended): represents a prepared statement, the server only compiles sql once
The same function can be achieved with mysqli and mysqli_result
Advantages: High efficiency, suitable for situations where the statements are the same but the data is different, and sql can be prevented Injection generation
mysqli_stmt example: non-select statement
require 'fns.php'; //创建mysqli对象方式 $mysqli = @new mysqli('127.0.0.1', 'root', '', 'test'); //只能用函数来判断是否连接成功 if(mysqli_connect_errno()) { echo mysqli_connect_error(); die; } $mysqli->set_charset('utf8'); $sql = "insert into limove values(?, ?, ?)"; //语句一样值不相同情况 //mysqli中有直接的方法可用 $stmt = $mysqli->prepare($sql); //绑定参数 $stmt->bind_param('iss', $id, $name, $order); for($i=0;$i<5;$i++){ $id = 0; $name = 'name'; $order = mt_rand(1, 1000); $stmt->execute(); } //最后id ee($stmt->insert_id); //影响的行数 注:最后一条执行的 ee($stmt->affected_rows); //错误号 ee($stmt->errno); //错误信息 ee($stmt->error); //stmt对象中可以看到更多的信息 ee($stmt); eee($mysqli);
mysqli_stmt example: select statement 1
require 'fns.php'; //创建mysqli对象方式 $mysqli = @new mysqli('127.0.0.1', 'root', '', 'test'); //只能用函数来判断是否连接成功 if(mysqli_connect_errno()) { echo mysqli_connect_error(); die; } $mysqli->set_charset('utf8'); $sql = "select * from limove where id
Summary: The above is the entire content of this article, I hope it will be helpful to everyone's study.
Related recommendations:
Use php to realize automatic login storage mechanism within a week
PHP Simple use of user authentication and tag recommendation
Use php to interact with the server and web front-end interface
The above is the detailed content of How to use php to manipulate mysqli database. For more information, please follow other related articles on the PHP Chinese website!

Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

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

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics











PHP and Python each have their own advantages, and choose according to project requirements. 1.PHP is suitable for web development, especially for rapid development and maintenance of websites. 2. Python is suitable for data science, machine learning and artificial intelligence, with concise syntax and suitable for beginners.

PHP is widely used in e-commerce, content management systems and API development. 1) E-commerce: used for shopping cart function and payment processing. 2) Content management system: used for dynamic content generation and user management. 3) API development: used for RESTful API development and API security. Through performance optimization and best practices, the efficiency and maintainability of PHP applications are improved.

PHP is a scripting language widely used on the server side, especially suitable for web development. 1.PHP can embed HTML, process HTTP requests and responses, and supports a variety of databases. 2.PHP is used to generate dynamic web content, process form data, access databases, etc., with strong community support and open source resources. 3. PHP is an interpreted language, and the execution process includes lexical analysis, grammatical analysis, compilation and execution. 4.PHP can be combined with MySQL for advanced applications such as user registration systems. 5. When debugging PHP, you can use functions such as error_reporting() and var_dump(). 6. Optimize PHP code to use caching mechanisms, optimize database queries and use built-in functions. 7

PHP is still dynamic and still occupies an important position in the field of modern programming. 1) PHP's simplicity and powerful community support make it widely used in web development; 2) Its flexibility and stability make it outstanding in handling web forms, database operations and file processing; 3) PHP is constantly evolving and optimizing, suitable for beginners and experienced developers.

PHP is suitable for web development, especially in rapid development and processing dynamic content, but is not good at data science and enterprise-level applications. Compared with Python, PHP has more advantages in web development, but is not as good as Python in the field of data science; compared with Java, PHP performs worse in enterprise-level applications, but is more flexible in web development; compared with JavaScript, PHP is more concise in back-end development, but is not as good as JavaScript in front-end development.

PHP and Python each have their own advantages and are suitable for different scenarios. 1.PHP is suitable for web development and provides built-in web servers and rich function libraries. 2. Python is suitable for data science and machine learning, with concise syntax and a powerful standard library. When choosing, it should be decided based on project requirements.

PHP and Python have their own advantages and disadvantages, and the choice depends on project needs and personal preferences. 1.PHP is suitable for rapid development and maintenance of large-scale web applications. 2. Python dominates the field of data science and machine learning.

PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.
