Mybatis Generator逆向工程的使用

一.在 idea 中使用 mybatis generator 逆向工程

1.在IDEA上创建maven工程。

2.在pom.xml中配置MyBatis逆向工程插件

<!--MyBatis自动生成工具插件-->
      <plugin>
        <groupId>org.mybatis.generator</groupId>
        <artifactId>mybatis-generator-maven-plugin</artifactId>
        <version>1.3.</version>
        <configuration>
          <verbose>true</verbose>
          <overwrite>true</overwrite>
        </configuration>
      </plugin>

3..配置generatorConfig.xml；

<?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="mybatisGenerator" targetRuntime="MyBatis3">
        <commentGenerator>
            <!-- 是否去除自动生成的注释 true：是 ： false:否 -->
            <property name="suppressAllComments" value="true" />
        </commentGenerator>
        <!--数据库连接的信息：驱动类、连接地址、用户名、密码 -->
        <jdbcConnection driverClass="com.mysql.cj.jdbc.Driver"
                        connectionURL="jdbc:mysql://localhost:3306/e3mall"
                        userId="root"
                        password="root">
        </jdbcConnection>

        <!-- 默认false，把JDBC DECIMAL 和 NUMERIC 类型解析为 Integer，为 true时把JDBC DECIMAL 和
            NUMERIC 类型解析为java.math.BigDecimal -->
        <javaTypeResolver>
            <property name="forceBigDecimals" value="true" />
        </javaTypeResolver>

        <!-- targetProject:生成PO类的位置 -->
        <javaModelGenerator targetPackage="com.yp.manager.entity"
                            targetProject="/Users/mryuan/IdeaProjects/creditRouter-tyr/onlineShop/onlineShop-mybatis-generator/src/main/java">
            <!-- enableSubPackages:是否让schema作为包的后缀 -->
            <property name="enableSubPackages" value="false" />
            <!-- 从数据库返回的值被清理前后的空格 -->
            <property name="trimStrings" value="true" />
        </javaModelGenerator>
        <!-- targetProject:mapper映射文件生成的位置 -->
        <sqlMapGenerator targetPackage="com.yp.manager.mapper"
                         targetProject="/Users/mryuan/IdeaProjects/creditRouter-tyr/onlineShop/onlineShop-mybatis-generator/src/main/java">
            <!-- enableSubPackages:是否让schema作为包的后缀 -->
            <property name="enableSubPackages" value="false" />
        </sqlMapGenerator>
        <!-- targetPackage：mapper接口生成的位置 -->
        <javaClientGenerator type="XMLMAPPER"
                             targetPackage="com.yp.manager.dao"
                             targetProject="/Users/mryuan/IdeaProjects/creditRouter-tyr/onlineShop/onlineShop-mybatis-generator/src/main/java">
            <!-- enableSubPackages:是否让schema作为包的后缀 -->
            <property name="enableSubPackages" value="false" />
        </javaClientGenerator>
        <!-- 指定数据库表 -->
        <table  tableName="tb_content"></table>
        <table  tableName="tb_content_category"></table>
        <table  tableName="tb_item"></table>
        <table  tableName="tb_item_cat"></table>
        <table  tableName="tb_item_desc"></table>
        <table  tableName="tb_item_param"></table>
        <table  tableName="tb_item_param_item"></table>
        <table  tableName="tb_order"></table>
        <table  tableName="tb_order_item"></table>
        <table  tableName="tb_order_shipping"></table>
        <table  tableName="tb_user"></table>

        <!-- 有些表的字段需要指定java类型
         <table schema="" tableName="">
            <columnOverride column="" javaType="" />
        </table> -->
    </context>
</generatorConfiguration>

4.执行Java 类

package com.yp.manager;

import org.mybatis.generator.api.MyBatisGenerator;
import org.mybatis.generator.config.Configuration;
import org.mybatis.generator.config.xml.ConfigurationParser;
import org.mybatis.generator.internal.DefaultShellCallback;

import java.io.File;
import java.util.ArrayList;
import java.util.List;

/**
 * desc
 *
 * @Author 袁朋
 * @Date 2019/3/5
 */
public class Generator {
    public void generator() throws Exception{
        List<String> warnings = new ArrayList<String>();
        boolean overwrite = true;
        /**指向逆向工程配置文件*/
        File configFile = new File("/Users/mryuan/IdeaProjects/creditRouter-tyr/onlineShop/onlineShop-mybatis-generator/src/main/resources/generationConfig.xml");
        ConfigurationParser parser = new ConfigurationParser(warnings);
        Configuration config = parser.parseConfiguration(configFile);
        DefaultShellCallback callback = new DefaultShellCallback(overwrite);
        MyBatisGenerator myBatisGenerator = new MyBatisGenerator(config,
                callback, warnings);
        myBatisGenerator.generate(null);
    }
    public static void main(String[] args) throws Exception {
        try {
            Generator generatorSqlmap = new Generator();
            generatorSqlmap.generator();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}