Home Database Mysql Tutorial mysql中Load Data记录换行问题的解决方法

mysql中Load Data记录换行问题的解决方法

Jun 07, 2016 pm 05:55 PM
data load

有关mysql中Load Data记录换行的问题的解决方法, 需要的朋友可以参考下

问题是这样的:

表persons有两个字段: id和name
文本文档persons.txt中内容(其中每行字段之间用tab分割):
1 Bush
2 Carter
3 Bush

在mysql命令行下使用 load data local infile “persons.txt” into table persons 导入数据到persons表中。

导入后查看persons表的数据,与persons.txt的内容一致。但是使用语句
select distinct name from persons
查询,结果中Bush出现了两次(正常结果应该是Bush只出现一次)。

原因分析:

经过分析,发现原因是windows下换行符为"\r\n",而mysql在load data时默认使用"\n"来切割每行记录,导致插入到表中前两条记录的name字段末尾多插入了不可见字符"\r";也就是说使用distinct关键字查询出来的两个Bush中,第一个词尾有回车符"\r”,而第二个词尾没有。
说明:
1. mysql默认使用tab来分割每行的字段。
2. 因为linux下换行符为"\n",所以在linux下不会出现上述问题。

修改方法:
只要在导入数据时指定以"\r\n"来换行就可以了。
修改后的导入数据语句为:

代码如下:
load data local infile “persons.txt” into table persons
lines terminated by “\r\n”;

Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

AI Hentai Generator

AI Hentai Generator

Generate AI Hentai for free.

Hot Article

R.E.P.O. Energy Crystals Explained and What They Do (Yellow Crystal)
3 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
R.E.P.O. Best Graphic Settings
3 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
R.E.P.O. How to Fix Audio if You Can't Hear Anyone
3 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
WWE 2K25: How To Unlock Everything In MyRise
4 weeks ago By 尊渡假赌尊渡假赌尊渡假赌

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

What data is in the data folder? What data is in the data folder? May 05, 2023 pm 04:30 PM

The data folder contains system and program data, such as software settings and installation packages. Each folder in the Data folder represents a different type of data storage folder, regardless of whether the Data file refers to the file name Data or the extension. Named data, they are all data files customized by the system or program. Data is a backup file for data storage. Generally, it can be opened with meidaplayer, notepad or word.

What to do if mysql load data is garbled? What to do if mysql load data is garbled? Feb 16, 2023 am 10:37 AM

The solution to the garbled mysql load data: 1. Find the SQL statement with garbled characters; 2. Modify the statement to "LOAD DATA LOCAL INFILE "employee.txt" INTO TABLE EMPLOYEE character set utf8;".

What are the differences between xdata and data What are the differences between xdata and data Dec 11, 2023 am 11:30 AM

The differences are: 1. xdata usually refers to independent variables, while data refers to the entire data set; 2. xdata is mainly used to establish data analysis models, while data is used for data analysis and statistics; 3. xdata is usually used for regression Analysis, variance analysis, predictive modeling, data can be analyzed using various statistical methods; 4. xdata usually requires data preprocessing, and data can contain complete original data.

More returns than sales: The Humane Ai Pin is becoming a commercial disaster More returns than sales: The Humane Ai Pin is becoming a commercial disaster Aug 08, 2024 pm 01:14 PM

Shortly after the launch of the Humane Ai Pin, scathing reviews revealed that the AI gadget was anything but ready for the market, as most of the originally advertised features either didn't work properly or were simply missing, the battery life was

AI project failure rates top 80% — study cites poor problem recognition and a focus on latest tech trends among major problems AI project failure rates top 80% — study cites poor problem recognition and a focus on latest tech trends among major problems Aug 31, 2024 am 12:59 AM

Everyone and their aunt seem to be hopping aboard the AI train in search of inflated profit margins and marketing hype — just look at AMD's recent Ryzen rebrand as a prime example of this AI hype. A recent study conducted by RAND has found that this

MySQL writes crazy error logs MySQL writes crazy error logs Feb 18, 2024 pm 05:00 PM

A core business database, the version is MySQL8.34 Community Server Edition. Since its launch, the error log of this database server has increased very rapidly (as shown in the figure below), and can increase to more than 10 G in capacity every 24 hours. Because there was a fault alarm and normal access to the business had not been affected, the relevant personnel were not allowed to restart the MySQL service. In view of this situation, I had to set up an automatic scheduled task to clean these logs at a fixed time every night. For specific operations, execute "crontab -e" on the system command line and add the following text line: 0001***echo>/data/mysql8/data/mysql_db/mysql.log Save and exit edit mode

Can't data in vue component be a function? Can't data in vue component be a function? Dec 19, 2022 pm 05:22 PM

No, data in the vue component must be a function. Components in Vue are used for reuse. In order to prevent data reuse, they are defined as functions. The data data in the vue component should be isolated from each other and not affect each other. Every time the component is reused, the data data should be copied once. Later, when the data data in the component is changed in a reused place, other data will be copied. If the data data of reused local components is not affected, you need to return an object as the status of the component through the data function.

Hackers can now reconstruct screen content from HDMI\'s electromagnetic radiation Hackers can now reconstruct screen content from HDMI\'s electromagnetic radiation Jul 30, 2024 am 10:01 AM

A concerning vulnerability has been revealed in modern computer systems, as per a new study. Federico Larroca at the University of the Republic in Montevideo, Uruguay, and his colleagues have developed an AI model that can reconstruct digital signals

See all articles