1.在指定字符集方面,mysql5版本的配着与4有些不同,以前的版本乎将要指定的变量放在mysqld中就可以了,或者在各个模块指定default-character-set=utf8也是可以的,但是在5.6版本是不行的,查看日志会发现有unknown variable'default-character-set=utf8的错
1.在指定字符集方面,mysql5版本的配着与4有些不同,以前的版本似乎将要指定的变量放在mysqld中就可以了,或者在各个模块指定default-character-set=utf8也是可以的,但是在5.6版本是不行的,查看日志会发现有unknown variable'default-character-set=utf8的错误。其实只要配置两个方面就可以了
[client] #password = your_password port = 3311 socket = "C:/SoftWareAndTool_tian/CompilerIDE/mysql/mysql.sock" default-character-set=utf8 # Here follows entries for some specific programs # The MySQL server [server] #port = 3311 #socket = "C:/SoftWareAndTool_tian/CompilerIDE/mysql/mysql.sock" character_set_server=utf8
然后查看
show variables like '%char%';
应该都是utf8了,如果不是,再把它们改过来即可。
2.用insert语句测试,如果insert语句插入的汉字可以读出,但是从文件载入的数据无法读出汉字,可能是以下两个问题之一:
载入数据时,指定字符编码、
load data local infile 'D:/1.txt' into table testdata character set utf8 fields teminated by '/t';
或者一个很容易犯的问题就是文件本身不是utf8编码的,尤其windows环境下,文本经常默认ansiic编码,这种情况将文本编码更改即可。

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


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