逆向工程(Mybatis Generator)

概念

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>