Shulou(Shulou.com)06/01 Report--

When using mybatis, a large number of mapping mapping files need to be written, and manual writing is heavy and error-prone. Fortunately, Mybatis-Generator can be used to help us generate these files automatically and greatly improve the efficiency of development.

1. Preparatory work

Download mybatis-generator 's jar package from https://github.com/mybatis/generator/releases

Download the database driver package from http://www.grepcode.com.

Create the following structure directory:

2.generator.xml introduction

Before generating related files, you need to configure the configuration file with any name and suffix xml. (attribute-related explanations are available in xml. If you don't understand them, you can try to see how the effect is different.)

3. Running

There are four types of operations: command generation (the simplest), Java generation, ant generation, and maven generation. The first two are mentioned here. If you are interested, you can learn the rest on the mybatis website.

1) Open the cmd command window, cd to the working directory, and run the following command

The file path of the java-jar mybatis-generator package-the file path of configfile generator.xml-overwrite command.

This example is:

Java-jar mybatis-generator-core-1.3.2.jar-configfile generator.xml-overwrite

Output when successful: MyBatis Generator finished successfully.

2) java generation

List warnings = new ArrayList ()

Boolean overwrite = true

File configFile = new File ("generatorConfig.xml")

ConfigurationParser cp = new ConfigurationParser (warnings)

Configuration config = cp.parseConfiguration (configFile)

DefaultShellCallback callback = new DefaultShellCallback (overwrite)

MyBatisGenerator myBatisGenerator = new MyBatisGenerator (config, callback, warnings)

MyBatisGenerator.generate (null)

In fact, Java operation, subdivision can be divided into two kinds, and one can go to the official website to learn.

4. Effect.

After generating the code, according to your actual project architecture, you can make appropriate changes to the generated code, such as handing over database management to spring and so on.

5. Pay attention

1) generator.xml format: must be encoded in UTF-8 BOM-free format and converted by notepad++.

2) pay attention to the availability of the database package, invalid database package conversion will report an error.

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.