/dev/mapper/volgroup-lv_root is a logical volume, and you can see that it is associated with the "/" root partition through the df–h command, which you can also understand as the root partition.[[emailprotected] ~]# df -hFilesystem Size Used Avail Use% Mounted on/dev/mapper/VolGroup-lv_root 18G 1.2G 16G 7% /tmpfs 495M 0 495M 0% /dev/shm/dev/sda1
Mybatis-spring allows you to inject the mapper into the service bean. When using the Mapper, call the mapper just as you would call DAO, but at this point you do not need to encode any DAO implementations because MyBatis will do it for you.With the injected mapper, your code will not appear to have any mybatis-spring d
how 1.Mapper agents are developedUsing MyBatis to develop DAO, there are usually two methods, namely the original DAO development method and the Mapper interface development method. MyBatis in the development of DAO, it involves three sisters, namely Sqlsessionfactorybuilder, Sqlsessionfactroy, sqlsession.Small partners know that the sqlsession in the operation of the database, such as: adding and removing
first, the realization principle
The Mapper interface development method requires only programmers to write mapper interfaces (equivalent to the DAO Interface), and the MyBatis framework creates interface dynamic proxy objects based on interface definitions, and the proxy object's method body implements the class method with the top DAO interface.
Map
First, the realization principleMapper interface development method only requires programmers to write the Mapper interface (equivalent to DAO interface), the MyBatis framework creates an interface based on the interface definition of the dynamic proxy object, the proxy object's method body with the upper DAO interface implementation class method.Mapper interface development is subject to the following specifications:1. The namespace in the Mapper.xml
Spring + SpringMVC + MyBatis deep learning and building (2) -- MyBatis original Dao development and mapper Agent Development, springmvcmybatis
Reprinted please indicate the source: http://www.cnblogs.com/Joanna-Yan/p/6869133.html
I have written Spring + SpringMVC + MyBatis for deep learning and building (I)-basic knowledge of MyBatis. There are a lot of repeated code in MybatisFirst. The code is simplified this time:
There are two methods to develop D
Mapper interface development method only requires programmers to write the Mapper interface (equivalent to DAO interface), the MyBatis framework creates an interface based on the interface definition of the dynamic proxy object, the proxy object's method body with the upper DAO interface implementation class method.Mapper interface development is subject to the following specifications:1. The namespace in t
Mybatis BASICS (2) ---- development of the original dao and mapper proxy, mybatismapper
Undertake the previous mybatis entry-level BASICS (1)
After reading the previous article, I can see that there are a lot of repeated code in MybatisService, which does not seem very clear, but the first time I write it like that, I want to know how to execute mybatis, bitter before sweet!I. Original dao Development Method
Summary: 1. Compile the dao interface and d
The previous post summarizes some of the drawbacks of MyBatis's approach to using primitive DAO, and we certainly won't use it, so how do we develop DAO in MyBatis? As described in title, this blog post mainly summarizes the steps to develop DAO using the Mapper proxy method.When developing DAO using the Mapper proxy method, programmers only need to do two things:
Need to write Mapper.xml map
be useful in a row data entry. Moving these logic over and over makes the row data entry evolve into an activity record, reducing the duplication of business logic.4.2 Field ModelsIf you want to change the structure of the database but do not want to change the domain logic, the use of row data entry is a good choice. In most cases, the data mapper is more suited to the domain model.Row data entry can be used in conjunction with the data
The advantage of the MapReduce framework is the ability to run mapper and reducer tasks in parallel in the cluster, how to determine the number of mapper and reducer, or how to programmatically control the number of mapper and reducer that the job starts? In the mapper and reducer of the Hadoop-2.4.1 study, it was ment
reduce task, and finally the result is output by the reduce task, and the MapReduce framework is responsible for the task scheduling, monitoring and re-executing the failed task during the whole execution.Usually the compute nodes and storage nodes are the same, and the MapReduce framework effectively schedules the tasks on the nodes where the data is stored, helping to reduce the amount of bandwidth used when transferring data. The MapReduce application provides the map and reduce functions by
The generic file system name of the Linux system is similar to/DEV/SDA1 or/DEV/HDA1, but today, with the maintenance of the system, the DF-H command is used to knock out the/dev/mapper/volgroup-lv_root and/dev/mapper/ Volume-lv_home two file system name, puzzled, on the Internet to find information, in this talk about/dev/mapper directory.First, understand the Li
MyBatis interface and corresponding mapper file location configuration detailedthe original link is: 71480954Today encountered a problem is mybatis in the interface and corresponding mapper file location, and the operation will be different, in the internet for a long time finally found the method, here is a simple analysis:We know that in a typical MAVEN project, the directory structure is: Src/main/java a
Mybatis mapperscannerconfigurer Auto-scan injects mapper interface generation agent into springMyBatis can configure Mapperfactorybean to generate proxies for mapper interfaces when integrated with spring. For exampleclass= "Org.mybatis.spring.mapper.MapperFactoryBean" > The proxy class created by Mapperfactorybean implements the Usermapper interface and injects it into the application. Because the agent
Mapper excuse similar to DAO connectorThe MyBatis framework creates an interface's dynamic proxy object based on the interface definitionMapper interface development needs to follow 4 development specificationsThe namesapce of the mapping file in mapper is the same as the classpath of the Mapper interfaceThe Mapper int
Summary after reading:O/R Mapping is the relational object ing.Databases are used to map classes and data tables.The advantage is that it can automatically generate an object to save, delete, and read SQL statements.Currently, ado.net objectspaces does not support Chinese queries. The version only supports SQL Server 2000 or later;Looking forward to ADO. net2.0
Original article:What is o/R mapper?
Author: Huo www.aspcool.com time: 13:35:56 views:
Read Catalogue
One: The original DAO development method
Two: Mapper Proxy method (requires only mapper interface, equivalent to DAO interface)
To undertake the first MyBatis Foundation (i)Read a friend, you can certainly see that there is a lot of mybatisservice in the duplicate code, it does not seem very clear, but the first time to write, is to understand the mybatis of the implementati
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