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逆向工程在idea开发项目的使用

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逆向工程技术的使用

一、逆向工程


逆向工程：mybaits需要程序员自己编写sql语句，编写过程比较繁琐。因此mybatis官方提供逆向工程mybatis-generator,可以根据表与表之间的关系，自动生成mybatis执行所需要的代码（mapper.java,mapper.xml,pojo）

二、逆向工程的准备


1.建立一个数据库表（你要操作的）


2.jar包准备（pom.xml引入依赖包，下面引入包比较多，可根据需要引入）

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<?xml version="1.0" encoding="UTF-8"?>

<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>com.yy</groupId>
    <artifactId>YYcoder</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>war</packaging>

    <name>YYcoder Maven Webapp</name>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.7</maven.compiler.source>
        <maven.compiler.target>1.7</maven.compiler.target>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <spring.version>4.1.4.RELEASE</spring.version>
        <jackson.version>2.5.0</jackson.version>
    </properties>

    <dependencies>
        <!-- junit -->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <scope>test</scope>
        </dependency>

        <!-- spring 所有核心包 -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-beans</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-tx</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-web</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</artifactId>
            <version>${spring.version}</version>
            <scope>test</scope>
        </dependency>

        <!-- mybatis 包 -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.2.8</version>
        </dependency>


        <!--mybatis spring 整合 -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>1.2.2</version>
        </dependency>

        <!-- mysql连接  注意版本-->

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.46</version>
        </dependency>


        <!-- 数据源 -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.0.12</version>
        </dependency>

        <!-- aspectjweaver是spring的切入点表达式需要用的包， -->
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.8.4</version>
        </dependency>

        <!-- log4j -->
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.17</version>
        </dependency>

        <!-- servlet -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>servlet-api</artifactId>
            <version>3.0-alpha-1</version>
            <scope>provided</scope>
        </dependency>
        <!-- jstl  -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>

        <!-- java对象和json相互转化 -->
        <dependency>
            <groupId>org.codehaus.jackson</groupId>
            <artifactId>jackson-mapper-asl</artifactId>
            <version>1.9.13</version>
        </dependency>
        <!-- 后台转化为json格式 -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.3</version>
        </dependency>
        <!-- springmvc框架整合AJAX使用@ResponseBody需要此包 -->
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-annotations</artifactId>
            <version>${jackson.version}</version>
        </dependency>
        <!-- 基本的序列化和反序列化 -->
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-core</artifactId>
            <version>${jackson.version}</version>
        </dependency>
        <!-- 将JSON格式的数据转化为类对象 -->
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>${jackson.version}</version>
        </dependency>
        <!-- 文件上传 -->
        <dependency>
            <groupId>commons-io</groupId>
            <artifactId>commons-io</artifactId>
            <version>2.4</version>
        </dependency>

        <!-- mybatis-generator-core 反向生成java代码-->
        <dependency>
            <groupId>org.mybatis.generator</groupId>
            <artifactId>mybatis-generator-core</artifactId>
            <version>1.3.5</version>
        </dependency>

        <!-- 文件上传 -->
        <dependency>
            <groupId>commons-fileupload</groupId>
            <artifactId>commons-fileupload</artifactId>
            <version>1.2.2</version>
        </dependency>
        <!-- mybatis-redis整合依赖 -->
        <dependency>
            <groupId>org.mybatis.caches</groupId>
            <artifactId>mybatis-redis</artifactId>
            <version>1.0.0-beta2</version>
        </dependency>
        <!-- spring 整合 redis -->
        <dependency>
            <groupId>org.springframework.data</groupId>
            <artifactId>spring-data-redis</artifactId>
            <version>1.0.2.RELEASE</version>
        </dependency>
        <!-- jedis 依赖 -->
        <dependency>
            <groupId>redis.clients</groupId>
            <artifactId>jedis</artifactId>
            <version>2.1.0</version>
        </dependency>
    </dependencies>

    <build>
        <finalName>YYcoder</finalName>
        <plugins>
            <!-- 资源文件拷贝插件 -->
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-resources-plugin</artifactId>
                <version>2.7</version>
                <configuration>
                    <encoding>UTF-8</encoding>
                </configuration>
            </plugin>
            <!-- java编译插件 -->
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.2</version>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                    <encoding>UTF-8</encoding>
                </configuration>
            </plugin>
            <!-- 配置Tomcat插件 -->
            <plugin>
                <groupId>org.apache.tomcat.maven</groupId>
                <artifactId>tomcat7-maven-plugin</artifactId>
                <version>2.2</version>
                <configuration>
                    <uriEncoding>UTF-8</uriEncoding>
                </configuration>
            </plugin>

            <!--逆向工程插件-->

            <!-- mybatis generator 自动生成代码插件 -->
            <plugin>
                <groupId>org.mybatis.generator</groupId>
                <artifactId>mybatis-generator-maven-plugin</artifactId>
                <version>1.3.5</version>
                <configuration>
                    <!-- 配置文件路径 -->
                    <overwrite>true</overwrite>
                    <verbose>true</verbose>
                </configuration>
            </plugin>


        </plugins>
        <resources>
            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <include>**/*.xml</include>
                </includes>
            </resource>
        </resources>
    </build>
</project>

3.编写generatorConfig.xml

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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 >
    <!-- mysql jar 文件位置 -->

    <context id="store" targetRuntime="MyBatis3">
        <commentGenerator>
            <!-- 是否去除自动生成的注释 true：是 ： false:否 -->
            <property name="suppressAllComments" value="true" />
            <!-- 是否去除所有自动生成的文件的时间戳，默认为false -->
            <property name="suppressDate" 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.jdbc.Driver"
                        connectionURL="jdbc:mysql://localhost:3306/yy_mysql"
                        userId="root"
                        password="cyy493610">
        </jdbcConnection>
        <!-- targetPackage:包名称(自定义)  targetProject：项目路径(自定义)   -->
        <!--定义model的包名称-->
        <javaModelGenerator targetPackage="com.YYcoder.entity" targetProject="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>

        <!-- 配置生成相应的实体Mapper.xml，对于Mapper3.X我们需要把type="XMLMAPPER" -->
        <!-- targetPackage:包名称(自定义)  targetProject：项目路径(自定义)   -->
        <sqlMapGenerator targetPackage="com.YYcoder.mapper" targetProject="src/main/java">
            <property name="enableSubPackages" value="false" />
        </sqlMapGenerator>

        <!-- 配置生成相应的接口类，对应与Mapper.xml中的一系列CRUD方法SQL语句 -->
        <!-- targetPackage:包名称(自定义)  targetProject：项目路径(自定义)   -->
        <javaClientGenerator targetPackage="com.YYcoder.mapper" targetProject="src/main/java" type="XMLMAPPER">
            <property name="enableSubPackages" value="false" />
        </javaClientGenerator>

        <!-- 数据库表名 -->
        <!-- 取消生成example类-->
        <table tableName= "address" enableCountByExample="false"
               enableUpdateByExample="false"
               enableDeleteByExample="false"
               enableSelectByExample="false"
               selectByExampleQueryId="false"></table>
        <table tableName= "admin" ></table>
        <table tableName= "category" ></table>
        <table tableName= "goods" ></table>
        <table tableName= "imagepath" ></table>
        <table tableName= "order" ></table>
        <table tableName= "oderitem" ></table>
        <table tableName= "shop" ></table>
        <table tableName= "shopcart" ></table>
        <table tableName= "user" ></table>
    </context>
</generatorConfiguration>

4.编写测试类MyGenerator.java,运行生成对应的文件

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package com.YYcoder.Test;

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;
//编写java启动类，执行逆向工程的配置文件，生成数据库中指定表的model和dao层：
// （注意：启动类中创建File中的路径是从本项目中开始的，需要找到从项目开始写起，直到找到配置文件的路径即可）
public class MyGenerator {
    public void generate() throws Exception {
        List<String> warnings = new ArrayList<String>();
        boolean overwrite = true;
        File configFile = new File("./src/main/resources/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);
    }

    public static void main(String[] args) throws Exception {
        try {
            MyGenerator myGenerator = new MyGenerator();
            myGenerator.generate();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

5.运行后，相应的包会出现对应的文件，即为操作成功