逆向工程(Mybatis Generator)

概念

mybatis Generator 中文官网

mybatis需要程序员自己编写sql语句,mybatis官方提供逆向工程,可以针对单表 自动生成mybatis执行所需要的代码.(mapper.java、mapper.xml、po类)

常采用数据库生成java代码

相关配置文件

这里使用IDEA自带的maven插件配置搭建运行环境,当然,官网提供了更多使用generator的方法,具体可以参考 其他方法.

一、在使用maven之前,有必要贴一下maven插件所必须的setting.xml (默认是在C:\Users\${username}\.m2路径下)

<?xml version="1.0" encoding="UTF-8"?>
<settings xmlns="http://maven.apache.org/SETTINGS/1.0.0"
          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.0.0
                    http://maven.apache.org/xsd/settings-1.0.0.xsd">
    <localRepository>E:\Java\Maven\repository</localRepository>
    <interactiveMode>true</interactiveMode>
    <usePluginRegistry>false</usePluginRegistry>
    <offline>false</offline>
    <pluginGroups/>
    <servers/>
    <mirrors>
        <mirror>
            <id>nexus-aliyun</id>
            <mirrorOf>central</mirrorOf>
            <name>Nexus aliyun</name>
            <url>http://maven.aliyun.com/nexus/content/groups/public</url>
        </mirror>
    </mirrors>
    <proxies/>
    <profiles/>
    <activeProfiles/>
</settings>

二、接下来,重点是maven 使用的 pom.xml文件：

<?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>club.lemos</groupId>
    <artifactId>mybatis-generator</artifactId>
    <packaging>pom</packaging>
    <version>1.0-SNAPSHOT</version>

    <properties>
        <spring.version>4.3.4.RELEASE</spring.version>
        <mybatis.version>3.4.1</mybatis.version>
        <slf4j.version>1.7.21</slf4j.version>
    </properties>

    <dependencies>
        <!-- mybatis 包-->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>${mybatis.version}</version>
        </dependency>
        <!-- mybatis与spring整合包-->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>1.3.0</version>
        </dependency>
        <!-- javaee jar包-->
        <dependency>
            <groupId>javax</groupId>
            <artifactId>javaee-api</artifactId>
            <version>7.0</version>
        </dependency>
        <!-- mysql 驱动包-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.40</version>
        </dependency>
        <!--dbcp2-->
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-dbcp2</artifactId>
            <version>2.1.1</version>
        </dependency>
        <!-- 日志文件管理包-->
        <dependency>
            <groupId>org.apache.logging.log4j</groupId>
            <artifactId>log4j-api</artifactId>
            <version>2.7</version>
        </dependency>
        <dependency>
            <groupId>org.apache.logging.log4j</groupId>
            <artifactId>log4j-core</artifactId>
            <version>2.7</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>${slf4j.version}</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId>
            <version>${slf4j.version}</version>
        </dependency>
    </dependencies>

    <build>
        <resources>
            <!-- 复制非java文件到class路径下-->
            <resource>
                <directory>${basedir}/src/main/java</directory>
                <includes>
                    <include>**/*.properties</include>
                    <include>**/*.xml</include>
                </includes>
            </resource>
            <resource>
                <directory>${basedir}/src/main/resources</directory>
            </resource>
        </resources>
        <plugins>
            <plugin>
                <groupId>org.mybatis.generator</groupId>
                <artifactId>mybatis-generator-maven-plugin</artifactId>
                <version>1.3.5</version>
                <!-- 配置generatorConfig.xml的路径和名称 -->
                <configuration>
                    <configurationFile>
                        ${basedir}\src\main\resources\generatorConfig.xml
                    </configurationFile>
                </configuration>
                <!-- 配置generator运行插件,使maven执行generator -->
                <executions>
                    <execution>
                        <id>Generate MyBatis Artifacts</id>
                        <goals>
                            <goal>generate</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>

</project>

三、下面是generator的重要配置文件

该文件在项目中所在的位置：注意以上的properties配置应该和db.properties的匹配

文件的配置信息：

<?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>
    <!-- !!!! Driver Class Path !!!! -->
    <classPathEntry location="E:\Java\Maven\repository-taotao\mysql\mysql-connector-java\5.1.40\mysql-connector-java-5.1.40.jar"/>
    <context id="context" targetRuntime="MyBatis3">
        <!-- 是否去除注释-->
        <commentGenerator>
            <property name="suppressAllComments" value="true"/>
            <property name="suppressDate" value="true"/>
        </commentGenerator>
        <!-- !!!! Database Configurations !!!! -->
        <jdbcConnection driverClass="com.mysql.jdbc.Driver"
                        connectionURL="jdbc:mysql://localhost:3306/taotao?characterEncoding=UTF8&amp;useSSL=false"
                        userId="root" password="lemo"/>

        <javaTypeResolver>
            <property name="forceBigDecimals" value="false"/>
        </javaTypeResolver>

        <!-- !!!! Model Configurations !!!! -->
        <javaModelGenerator targetPackage="com.taotao.po" 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>

        <!-- !!!! Mapper XML Configurations !!!! -->
        <sqlMapGenerator targetPackage="com/taotao/mapping" targetProject="src/main/java">
            <property name="enableSubPackages" value="false"/>
        </sqlMapGenerator>

        <!-- !!!! Mapper Interface Configurations !!!! -->
        <javaClientGenerator targetPackage="com.taotao.mapper" targetProject="src/main/java" type="XMLMAPPER">
            <property name="enableSubPackages" value="false"/>
        </javaClientGenerator>

        <!-- !!!! Table Configurations !!!! -->
        <!-- 指定数据库表 -->
        <table schema="" tableName="tb_content"/>
        <table schema="" tableName="tb_content_category"/>
        <table schema="" tableName="tb_item"/>
        <table schema="" tableName="tb_item_cat"/>

    </context>
</generatorConfiguration>

四、配置运行maven

首先

然后，这里是+，然后选择maven，接着如下

最后,尝试运行

如果成功,输出窗口是这样的：

同时,相应的文件夹会生成项目需要的文件.

END

原文地址：https://www.cnblogs.com/luobentomoon/p/9231673.html