The following editor will bring you an article on how to obtain the database result set in PHP (recommended). The editor thinks it is quite good, so I will share it with you now and give it as a reference for everyone. Let’s follow the editor and take a look.
PHP often needs to access the database to advance the data in the database, so how to advance the data?
The code to extract the database is as follows:
<?php include("conn.php");//数据库连接 $sql="select* from study_sql";//查询数据库表名为study_sql所有的数据记录 $res=mysql_query($sql);//向数据库发送一条sql语句 //$arr=mysql_fetch_row($res);//获取数据库中的第一条信息 echo '<table apgn="center" width="800" border="1">';//获取的数据用表格显示出来 echo '<cabtion><h1 id="演示表">演示表</h1></cabtion>'; while($arr=mysql_fetch_assoc($res)){//取出表study_sql中的所有结果集 echo '<tr>'; foreach($arr as $col){//遍历数据 echo '<td>'.$col.'</td>'; } echo "</tr>"; } ?>
##Commonly used SQL functions are as follows:
mysql_affected_rows — Get the number of record rows affected by the previous MySQL operation mysql_cpent_encoding — Return the name of the character set mysql_close — Close the MySQL connection mysql_connect — Open a connection to the MySQL server mysql_create_db — Create a new MySQL database mysql_data_seek — Move internal results Pointer mysql_db_name — Get result data mysql_db_query — Send a MySQL query mysql_drop_db — Drop (delete) a MySQL database mysql_errno — Return to the previous one Numeric encoding of error messages in MySQL operationsmysql_error — Returns the text error message generated by the previous MySQL operationmysql_escape_string — Escapes a string for use with mysql_querymysql_fetch_array — Get a row from the result set as an associative array, or a numeric array, or both mysql_fetch_assoc — Get a row from the result set as an associative array mysql_fetch_field — Get the column information from the result set and Returned as an object mysql_fetch_lengths — Get the length of each output in the result set mysql_fetch_object — Get a row from the result set as an object mysql_fetch_row — Get a row from the result set as an enumeration Array mysql_field_flags — Get the flags associated with the specified field from the result mysql_field_len — Return the length of the specified field mysql_field_name — Get the field name of the specified field in the resultmysql_field_seek — Set the pointer in the result set to the specified field offset mysql_field_table — Get the table name where the specified field is located mysql_field_type — Get the type of the specified field in the result set mysql_free_result — Release result memorymysql_get_cpent_info — Get MySQL client informationmysql_get_host_info — Get MySQL host informationmysql_get_proto_info — Get MySQL protocol informationmysql_get_server_info — Get MySQL server information mysql_info — Get the latest query information mysql_insert_id — Get the ID generated by the previous INSERT operation mysql_pst_dbs — List All databases in the MySQL servermysql_pst_fields — List the fields in the MySQL resultsmysql_pst_processes — List the MySQL processesmysql_pst_tables — List the tables in the MySQL databasemysql_num_fields — Get the number of fields in the result set mysql_num_rows — Get the number of rows in the result set mysql_pconnect — Open a persistent connection to the MySQL server mysql_ping — Ping a server connection, or reconnect if not connected mysql_query — Send a MySQL query mysql_real_escape_string — Escape special characters in a string used in an SQL statement, taking into account the connection Current character setmysql_result — Get result datamysql_select_db — Select MySQL databasemysql_set_charset — Set the client’s character setmysql_stat — Get the current system status mysql_tablename — Gets the table name mysql_thread_id — Returns the ID of the current thread mysql_unbuffered_query — Sends a SQL query to MySQL without retrieving and caching the result rowsThe above is the detailed content of Detailed explanation of php obtaining database result set instance. For more information, please follow other related articles on the PHP Chinese website!

InnoDBBufferPool reduces disk I/O by caching data and indexing pages, improving database performance. Its working principle includes: 1. Data reading: Read data from BufferPool; 2. Data writing: After modifying the data, write to BufferPool and refresh it to disk regularly; 3. Cache management: Use the LRU algorithm to manage cache pages; 4. Reading mechanism: Load adjacent data pages in advance. By sizing the BufferPool and using multiple instances, database performance can be optimized.

Compared with other programming languages, MySQL is mainly used to store and manage data, while other languages such as Python, Java, and C are used for logical processing and application development. MySQL is known for its high performance, scalability and cross-platform support, suitable for data management needs, while other languages have advantages in their respective fields such as data analytics, enterprise applications, and system programming.

MySQL is worth learning because it is a powerful open source database management system suitable for data storage, management and analysis. 1) MySQL is a relational database that uses SQL to operate data and is suitable for structured data management. 2) The SQL language is the key to interacting with MySQL and supports CRUD operations. 3) The working principle of MySQL includes client/server architecture, storage engine and query optimizer. 4) Basic usage includes creating databases and tables, and advanced usage involves joining tables using JOIN. 5) Common errors include syntax errors and permission issues, and debugging skills include checking syntax and using EXPLAIN commands. 6) Performance optimization involves the use of indexes, optimization of SQL statements and regular maintenance of databases.

MySQL is suitable for beginners to learn database skills. 1. Install MySQL server and client tools. 2. Understand basic SQL queries, such as SELECT. 3. Master data operations: create tables, insert, update, and delete data. 4. Learn advanced skills: subquery and window functions. 5. Debugging and optimization: Check syntax, use indexes, avoid SELECT*, and use LIMIT.

MySQL efficiently manages structured data through table structure and SQL query, and implements inter-table relationships through foreign keys. 1. Define the data format and type when creating a table. 2. Use foreign keys to establish relationships between tables. 3. Improve performance through indexing and query optimization. 4. Regularly backup and monitor databases to ensure data security and performance optimization.

MySQL is an open source relational database management system that is widely used in Web development. Its key features include: 1. Supports multiple storage engines, such as InnoDB and MyISAM, suitable for different scenarios; 2. Provides master-slave replication functions to facilitate load balancing and data backup; 3. Improve query efficiency through query optimization and index use.

SQL is used to interact with MySQL database to realize data addition, deletion, modification, inspection and database design. 1) SQL performs data operations through SELECT, INSERT, UPDATE, DELETE statements; 2) Use CREATE, ALTER, DROP statements for database design and management; 3) Complex queries and data analysis are implemented through SQL to improve business decision-making efficiency.

The basic operations of MySQL include creating databases, tables, and using SQL to perform CRUD operations on data. 1. Create a database: CREATEDATABASEmy_first_db; 2. Create a table: CREATETABLEbooks(idINTAUTO_INCREMENTPRIMARYKEY, titleVARCHAR(100)NOTNULL, authorVARCHAR(100)NOTNULL, published_yearINT); 3. Insert data: INSERTINTObooks(title, author, published_year)VA


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

Dreamweaver Mac version
Visual web development tools

ZendStudio 13.5.1 Mac
Powerful PHP integrated development environment

SAP NetWeaver Server Adapter for Eclipse
Integrate Eclipse with SAP NetWeaver application server.

DVWA
Damn Vulnerable Web App (DVWA) is a PHP/MySQL web application that is very vulnerable. Its main goals are to be an aid for security professionals to test their skills and tools in a legal environment, to help web developers better understand the process of securing web applications, and to help teachers/students teach/learn in a classroom environment Web application security. The goal of DVWA is to practice some of the most common web vulnerabilities through a simple and straightforward interface, with varying degrees of difficulty. Please note that this software