今天公司的一个网站突然提示MySQL Error Duplicate entry '96624' for key 1错误,经过分析这个问题是由于mysql表中的一个id自增长字段导致。
我将id的int类型改成了bigint就可以了,其实再改回来可能也会好了。可能是数据库备份的时候出现了错误。开发的网站后台系统在测试过程中出现了这个问题:
Invalid Query : Duplicate entry ‘127′ for key 1
SQL is : INSERT INTO `kq_news` (`Title`,`Author`,`Type`,`Content`,`IsDel`,`Adate`,`Range`,`Lang`) values ('捐款活动','yuanying','3′,”,'0′,NOW(),'2′,'cn')
因为是第一次遇到这样的问题,GOOGLE了一下,类似问题N多,解决方法有很多雷同的,无非就是说修复表(repair),MySQL的修复工具myisamchk工具修复。试了一下,仍然没有解决。
然后查看了一下数据表结构:
代码如下:
CREATE TABLE IF NOT EXISTS `kq_news` (
`Id` tinyint(3) NOT NULL auto_increment,
`Title` varchar(90) collate latin1_general_ci NOT NULL,
`Content` text collate latin1_general_ci NOT NULL,
`Adate` date NOT NULL,
`IsDel` tinyint(1) NOT NULL default ‘0′,
`Hits` int(5) NOT NULL default ‘0′,
`Author` varchar(20) collate latin1_general_ci NOT NULL,
`Type` tinyint(1) NOT NULL default ‘1′,
`Lang` varchar(2) collate latin1_general_ci NOT NULL,
`Range` tinyint(1) NOT NULL default ‘1′,
PRIMARY KEY (`Id`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_general_ci ;
终于明白,原来是Id这个自增型字段类型搞错了!转换一下数据类型就搞定了!
之后打开了MYSQL手册找到了TINYINT和SMALLINT和INT类型的说明:
TINYINT[(M)] [UNSIGNED] [ZEROFILL]
一个很小的整数。有符号的范围是-128到127,无符号的范围是0到255
SMALLINT[(M)] [UNSIGNED] [ZEROFILL]
一个小整数。有符号的范围是-32768到32767,无符号的范围是0到65535。
MEDIUMINT[(M)] [UNSIGNED] [ZEROFILL]
一个中等大小整数。有符号的范围是-8388608到8388607,无符号的范围是0到16777215。
INT[(M)] [UNSIGNED] [ZEROFILL]
一个正常大小整数。有符号的范围是-2147483648到2147483647,无符号的范围是0到4294967295。
INTEGER[(M)] [UNSIGNED] [ZEROFILL]
这是INT的一个同义词。
BIGINT[(M)] [UNSIGNED] [ZEROFILL]
一个大整数。有符号的范围是-9223372036854775808到9223372036854775807,无符号的范围是0到
18446744073709551615。
原来如此!
那网上其它的Invalid Query : Duplicate entry ‘32767′ for key 1出错的原因也在于此了!

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

The main role of MySQL in web applications is to store and manage data. 1.MySQL efficiently processes user information, product catalogs, transaction records and other data. 2. Through SQL query, developers can extract information from the database to generate dynamic content. 3.MySQL works based on the client-server model to ensure acceptable query speed.

The steps to build a MySQL database include: 1. Create a database and table, 2. Insert data, and 3. Conduct queries. First, use the CREATEDATABASE and CREATETABLE statements to create the database and table, then use the INSERTINTO statement to insert the data, and finally use the SELECT statement to query the data.

MySQL is suitable for beginners because it is easy to use and powerful. 1.MySQL is a relational database, and uses SQL for CRUD operations. 2. It is simple to install and requires the root user password to be configured. 3. Use INSERT, UPDATE, DELETE, and SELECT to perform data operations. 4. ORDERBY, WHERE and JOIN can be used for complex queries. 5. Debugging requires checking the syntax and use EXPLAIN to analyze the query. 6. Optimization suggestions include using indexes, choosing the right data type and good programming habits.


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