mm.mysql是个类型4(即纯java),符合jdbc 2规范的mysql jdbc驱动程序。当前版本为2.0 pre 5(beta) 你可以从http://www.worldserver.com/mm.mysql/下载最新的驱动程序
本文只是简单描述一下mm.mysql的安装和使用
安装
1、下载mm.mysql
2、解压到某驱动器,如c:
3、修改classpath,加入mm.mysql的路径,如你原来的classpath可能是:
.;c:jdk1.2.2lib ools.jar;c:jdk1.2.2libdt.jar; 修改后可能是
.;c:jdk1.2.2lib ools.jar;c:jdk1.2.2libdt.jar;C:mm.mysql.jdbc-2.0pre5;
编程
1、用DriverManager登记mm.mysql
mm.mysql的class名为org.gjt.mm.mysql.Driver,登记时必须写成
Class.forName("org.gjt.mm.mysql.Driver").newInstance();
2、jdbc url参数说明
url格式:jdbc:mysql://[hostname][:port]/dbname[?param1=value1][?m2=value2]...
参数名 取值 缺省
user 数据库用户名 无
password 数据库用户口令 无
autoReconnect 当数据库连接丢失时是否自动连接,取值true/false false
maxReconnects 如果autoReconnect为true,此参数为重试次数,缺省为3次 3
initialTimeout 如果autoReconnect为true,此参数为重新连接前等待的秒数 2
maxRows 设置查询时返回的行数,0表示全部 0
useUnicode 是否使用unicode输出,true/false false
characterEncoding 如果useUnicode,该参数制定encoding类型,建议使用8859_1 无
提示
同时使用useUnicode,characterEncoding,能解决数据库输出时的中文问题
如:jdbc:mysql://localhost/test?user=root&useUnicode=true;characterEncoding=8859_1
实际例子,举一个简单的例子
这个jsp例子使用一个库,该库只有一个表(地址簿)
create database addressbook
use addressbook
create table addressbook (id int auto_increment primary key,name varchar(30),address varchar(255),phone varchar(20));
插入记录
insert into addressbook (name,address,phone) values (''jjx'',''zhejiang yuyao'',''0574-2222222'');

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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