回想一下MyBatis的基本操作,它需要实体类,自定义mapper接口以及mapper.xml配置文件。为了避免繁琐的工作量,MyBatis Generator,简称MBG,可自动生成框架所需的这些依赖,同时支持基本的CRUD操作,但是需要注意,MBG一般不要重复执行,否则会出问题。
下面是引入MBG的基本操作:
一、新建maven项目,引入依赖:
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< dependencies >
< dependency >
< groupId >org.mybatis</ groupId >
< artifactId >mybatis</ artifactId >
< version >3.5.5</ version >
</ dependency >
< dependency >
< groupId >mysql</ groupId >
< artifactId >mysql-connector-java</ artifactId >
< version >8.0.20</ version >
</ dependency >
< dependency >
< groupId >org.mybatis.generator</ groupId >
< artifactId >mybatis-generator-core</ artifactId >
< version >1.4.0</ version >
</ dependency >
</ dependencies >
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二、创建mbg配置文件:
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<? xml version = "1.0" encoding = "UTF-8" ?>
<!DOCTYPE generatorConfiguration
PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
"http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">
< generatorConfiguration >
< context id = "testMBG" targetRuntime = "MyBatis3" >
<!-- 连接池 -->
< jdbcConnection
driverClass = "com.mysql.cj.jdbc.Driver"
connectionURL = "jdbc:mysql://localhost:3306/demo"
userId = "root"
password = ""
></ jdbcConnection >
<!-- 配置JavaBean生成策略 -->
< javaModelGenerator targetPackage = "com.wts.entity" targetProject = "./src/main/java" ></ javaModelGenerator >
<!-- 配置SQL映射文件生成策略 -->
< sqlMapGenerator targetPackage = "com.wts.entity" targetProject = "./src/main/java" ></ sqlMapGenerator >
<!-- 配置Mapper接口的生成策略 -->
< javaClientGenerator targetPackage = "com.wts.entity" targetProject = "./src/main/java" ></ javaClientGenerator >
< table tableName = "user" domainObjectName = "User" ></ table >
</ context >
</ generatorConfiguration >
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三、运行Generator:
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public class MyTest {
public static void main(String[] args) {
List<String> warnings = new ArrayList<>();
File configFile = new File(MyTest. class .getResource( "generatorConfig.xml" ).getFile());
ConfigurationParser configurationParser = new ConfigurationParser(warnings);
Configuration configuration = null ;
try {
configuration = configurationParser.parseConfiguration(configFile);
} catch (IOException e) {
e.printStackTrace();
} catch (XMLParserException e) {
e.printStackTrace();
}
DefaultShellCallback callback = new DefaultShellCallback( true );
MyBatisGenerator myBatisGenerator = null ;
try {
myBatisGenerator = new MyBatisGenerator(configuration, callback, warnings);
} catch (InvalidConfigurationException e) {
e.printStackTrace();
}
try {
myBatisGenerator.generate( null );
} catch (SQLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
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这都是固定写法,了解一下即可。
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持服务器之家。
原文链接:https://www.cnblogs.com/viewts/p/13213865.html