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创建一个ovls-generator工程
核心是MyBatis Generator(它可以生成POJO(实体类)和sql.xml及sql方法和mapper(DAO接口))
一.导包
mysql-connector-java
mybatis
mybatis-generator-core
代码:
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>cn.xdl</groupId>
<artifactId>ovls-generator</artifactId>
<version>0.0.1-SNAPSHOT</version>
<dependencies>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.4.6</version>
</dependency>
<dependency>
<groupId>org.mybatis.generator</groupId>
<artifactId>mybatis-generator-core</artifactId>
<version>1.3.5</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.46</version>
</dependency>
</dependencies>
</project>
二.添加工具mybatis-generator配置文件mbg.xml在根目录下
配置文件内容在这个网站复制
http://www.mybatis.org/generator/configreference/xmlconfig.html
可以根据现有数据库表生成实体类、SQL定义文件、Mapper接口。
修改配置内容(自己的驱动包,自己的连接参数)
driverClass="com.mysql.jdbc.Driver"
jdbc:mysql://localhost:3306/库名
targetPackage="实体类存放的位置"
targetProject="实体类存放的项目目录">
代码
<?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>
<!-- 指定驱动包 ,复制mysql-connector-java-5.1.46.jar路径过来-->
<classPathEntry location="C:\Users\Administrator\.m2\repository\mysql\mysql-connector-java\5.1.46\mysql-connector-java-5.1.46.jar" />
<context id="DB2Tables" targetRuntime="MyBatis3">
<!-- 指定连接参数 -->
<!-- jdbc:mysql://localhost:3306/库名 -->
<jdbcConnection driverClass="com.mysql.jdbc.Driver"
connectionURL="jdbc:mysql://localhost:3306/ovls"
userId="root"
password="root">
</jdbcConnection>
<javaTypeResolver >
<property name="forceBigDecimals" value="false" />
</javaTypeResolver>
<!-- 指定entity实体类位置 -->
<!-- targetPackage="实体类存放的位置"
targetProject="实体类存放的项目目录"> -->
<javaModelGenerator targetPackage="cn.xdl.ovls.entity" targetProject=".\src\main\java">
<property name="enableSubPackages" value="true" />
<property name="trimStrings" value="true" />
</javaModelGenerator>
<!-- 指定sql xml位置 -->
<sqlMapGenerator targetPackage="sql" targetProject=".\src\main\resources">
<property name="enableSubPackages" value="true" />
</sqlMapGenerator>
<!-- 指定Mapper接口位置 -->
<javaClientGenerator type="XMLMAPPER" targetPackage="cn.xdl.ovls.dao" targetProject=".\src\main\java">
<property name="enableSubPackages" value="true" />
</javaClientGenerator>
<!-- 指定根据数据哪些表生成上面元素 -->
<table tableName="%" enableCountByExample="false"
enableDeleteByExample="false" enableSelectByExample="false"
enableUpdateByExample="false">
</table>
</context>
</generatorConfiguration>
三.加载配置文件执行生成
配置文件内容在这个网站复制
http://www.mybatis.org/generator/running/runningWithJava.html
创建一个RunMyBitisGenerator类复制里面代码
运行 快捷键Alt+Shift+X,J
自动生成实体类、SQL定义文件、Mapper接口
代码
public class RunMyBatisGenerator {
public static void main(String[] args) throws Exception{
List<String> warnings = new ArrayList<String>();
boolean overwrite = true;
File configFile = new File("mbg.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);
}
}