Home Database Mysql Tutorial Oracle中经典的问题解决方案

Oracle中经典的问题解决方案

Jun 07, 2016 pm 05:12 PM
data

对于Oracle数据库的开发,我们可能有时候会遇到一些奇怪的问题,与其它数据库存在不同的差异的问题,在这里我列举了一些比较有趣

对于Oracle数据库的开发,我们可能有时候会遇到一些奇怪的问题,与其它数据库存在不同的差异的问题,在这里我列举了一些比较有趣的问题

问题一:解决Oracle中时间问题

Oracle默认date类型为21/8月/2011 或者21/8月//11的格式,如果想修改date类型:需要修改注册表

Regedit  进入注册表找到HKEY_LOCAL_MACHINE 再进入software 然后进入Oracle,找寻带HOME的文件夹,进入之后右击鼠标,新建字符串值,再值名为“NLS_DATE_FORMAT”,在“键值”中输入“YYYY-MM-DD hh:mm:ss(可以根据需要填写格式)”

修改完之后进入 sqlplus 键入  select sysdate from dual  查看修改之后

问题二:在Oracle中char(2)类型,在Hibernate查询出来的时候会自动截取字符,只留下一个字符:如Oracle中01,查询出来就是0

问题三:Oracle中number类型

如果Oracle中Number类型不指定大小,那么Hibernate进行反转的时候,生成的类型会根据Hibernate默认配置好的类型生成,我这里假设反转之后的类型是Bigdecimal类型,如果我们想修改反转之后的类型:

新建一个类 MyOracleDialect extends org.hibernate.dialect.OracleDialect并在里面补充注册的类型映射如下:

public class MyOracleDialect extends OracleDialect{

public MyOracleDialect(){

super();

registerHibernateType(java.sql.Types.Decimal,Hibernate.Big_DECIMAL.getName());

registerHibernateType(java.sql.Types.Number,Hibernate.Integer.getName());//注册Number的映射类型为Integer

}

}

问题四:在Oracle中,千万不要忘记了一张表只允许有一个long类型,所说这是基本问题,但是我还是想在这里提一下

问题五:删除表空间错误、

第一种解解决方案:

解决方案先以用户sys登陆

写如下代码:

alter database open;//执行完这句代码观看异常类型,错误代号

alter database datafile 9(错误代号) offline drop;//直接删除

alter database open;//如果没有保存,则成功

第二种解决方案:

用sys登陆

键入步骤如下:

connect sys/change_on_install as sysdba     //是否提示已成功

shutdown normal   //提示数据库以关闭,已经卸载数据库

startup mount //提示oracle已经启动的一些信息

alter database open; //出现错误 注意第一行,错误信息类似于 无法标示/锁定数据文件 19(错误代号)   其它信息

alter database datafile 19 drop;  //提示数据库以更改

alter database open ;//  执行这行代码如果还有问题,那么就在继续执行上面代码

shutdown normal  ;//数据库以及关闭,已经卸载数据库,Oracle例程已经关闭

startup  //启动例程

不出意外的话,这个问题已经解决了,,用户可以登录了

linux

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)
2 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
Repo: How To Revive Teammates
4 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
Hello Kitty Island Adventure: How To Get Giant Seeds
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)

Open source! Beyond ZoeDepth! DepthFM: Fast and accurate monocular depth estimation! Open source! Beyond ZoeDepth! DepthFM: Fast and accurate monocular depth estimation! Apr 03, 2024 pm 12:04 PM

0.What does this article do? We propose DepthFM: a versatile and fast state-of-the-art generative monocular depth estimation model. In addition to traditional depth estimation tasks, DepthFM also demonstrates state-of-the-art capabilities in downstream tasks such as depth inpainting. DepthFM is efficient and can synthesize depth maps within a few inference steps. Let’s read about this work together ~ 1. Paper information title: DepthFM: FastMonocularDepthEstimationwithFlowMatching Author: MingGui, JohannesS.Fischer, UlrichPrestel, PingchuanMa, Dmytr

Use ddrescue to recover data on Linux Use ddrescue to recover data on Linux Mar 20, 2024 pm 01:37 PM

DDREASE is a tool for recovering data from file or block devices such as hard drives, SSDs, RAM disks, CDs, DVDs and USB storage devices. It copies data from one block device to another, leaving corrupted data blocks behind and moving only good data blocks. ddreasue is a powerful recovery tool that is fully automated as it does not require any interference during recovery operations. Additionally, thanks to the ddasue map file, it can be stopped and resumed at any time. Other key features of DDREASE are as follows: It does not overwrite recovered data but fills the gaps in case of iterative recovery. However, it can be truncated if the tool is instructed to do so explicitly. Recover data from multiple files or blocks to a single

How to use Excel filter function with multiple conditions How to use Excel filter function with multiple conditions Feb 26, 2024 am 10:19 AM

If you need to know how to use filtering with multiple criteria in Excel, the following tutorial will guide you through the steps to ensure you can filter and sort your data effectively. Excel's filtering function is very powerful and can help you extract the information you need from large amounts of data. This function can filter data according to the conditions you set and display only the parts that meet the conditions, making data management more efficient. By using the filter function, you can quickly find target data, saving time in finding and organizing data. This function can not only be applied to simple data lists, but can also be filtered based on multiple conditions to help you locate the information you need more accurately. Overall, Excel’s filtering function is a very practical

Google is ecstatic: JAX performance surpasses Pytorch and TensorFlow! It may become the fastest choice for GPU inference training Google is ecstatic: JAX performance surpasses Pytorch and TensorFlow! It may become the fastest choice for GPU inference training Apr 01, 2024 pm 07:46 PM

The performance of JAX, promoted by Google, has surpassed that of Pytorch and TensorFlow in recent benchmark tests, ranking first in 7 indicators. And the test was not done on the TPU with the best JAX performance. Although among developers, Pytorch is still more popular than Tensorflow. But in the future, perhaps more large models will be trained and run based on the JAX platform. Models Recently, the Keras team benchmarked three backends (TensorFlow, JAX, PyTorch) with the native PyTorch implementation and Keras2 with TensorFlow. First, they select a set of mainstream

The vitality of super intelligence awakens! But with the arrival of self-updating AI, mothers no longer have to worry about data bottlenecks The vitality of super intelligence awakens! But with the arrival of self-updating AI, mothers no longer have to worry about data bottlenecks Apr 29, 2024 pm 06:55 PM

I cry to death. The world is madly building big models. The data on the Internet is not enough. It is not enough at all. The training model looks like "The Hunger Games", and AI researchers around the world are worrying about how to feed these data voracious eaters. This problem is particularly prominent in multi-modal tasks. At a time when nothing could be done, a start-up team from the Department of Renmin University of China used its own new model to become the first in China to make "model-generated data feed itself" a reality. Moreover, it is a two-pronged approach on the understanding side and the generation side. Both sides can generate high-quality, multi-modal new data and provide data feedback to the model itself. What is a model? Awaker 1.0, a large multi-modal model that just appeared on the Zhongguancun Forum. Who is the team? Sophon engine. Founded by Gao Yizhao, a doctoral student at Renmin University’s Hillhouse School of Artificial Intelligence.

Slow Cellular Data Internet Speeds on iPhone: Fixes Slow Cellular Data Internet Speeds on iPhone: Fixes May 03, 2024 pm 09:01 PM

Facing lag, slow mobile data connection on iPhone? Typically, the strength of cellular internet on your phone depends on several factors such as region, cellular network type, roaming type, etc. There are some things you can do to get a faster, more reliable cellular Internet connection. Fix 1 – Force Restart iPhone Sometimes, force restarting your device just resets a lot of things, including the cellular connection. Step 1 – Just press the volume up key once and release. Next, press the Volume Down key and release it again. Step 2 – The next part of the process is to hold the button on the right side. Let the iPhone finish restarting. Enable cellular data and check network speed. Check again Fix 2 – Change data mode While 5G offers better network speeds, it works better when the signal is weaker

The U.S. Air Force showcases its first AI fighter jet with high profile! The minister personally conducted the test drive without interfering during the whole process, and 100,000 lines of code were tested for 21 times. The U.S. Air Force showcases its first AI fighter jet with high profile! The minister personally conducted the test drive without interfering during the whole process, and 100,000 lines of code were tested for 21 times. May 07, 2024 pm 05:00 PM

Recently, the military circle has been overwhelmed by the news: US military fighter jets can now complete fully automatic air combat using AI. Yes, just recently, the US military’s AI fighter jet was made public for the first time and the mystery was unveiled. The full name of this fighter is the Variable Stability Simulator Test Aircraft (VISTA). It was personally flown by the Secretary of the US Air Force to simulate a one-on-one air battle. On May 2, U.S. Air Force Secretary Frank Kendall took off in an X-62AVISTA at Edwards Air Force Base. Note that during the one-hour flight, all flight actions were completed autonomously by AI! Kendall said - "For the past few decades, we have been thinking about the unlimited potential of autonomous air-to-air combat, but it has always seemed out of reach." However now,

The first robot to autonomously complete human tasks appears, with five fingers that are flexible and fast, and large models support virtual space training The first robot to autonomously complete human tasks appears, with five fingers that are flexible and fast, and large models support virtual space training Mar 11, 2024 pm 12:10 PM

This week, FigureAI, a robotics company invested by OpenAI, Microsoft, Bezos, and Nvidia, announced that it has received nearly $700 million in financing and plans to develop a humanoid robot that can walk independently within the next year. And Tesla’s Optimus Prime has repeatedly received good news. No one doubts that this year will be the year when humanoid robots explode. SanctuaryAI, a Canadian-based robotics company, recently released a new humanoid robot, Phoenix. Officials claim that it can complete many tasks autonomously at the same speed as humans. Pheonix, the world's first robot that can autonomously complete tasks at human speeds, can gently grab, move and elegantly place each object to its left and right sides. It can autonomously identify objects

See all articles