利用MyBatis Generator进行数据层代码自动生成

1. 新建maven工程

导入如下pom：

<?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.zxl</groupId>
    <artifactId>MyBatisGeneratorDemo</artifactId>
    <version>1.0-SNAPSHOT</version>

    <dependencies>
        <dependency>
            <groupId>org.mybatis.generator</groupId>
            <artifactId>mybatis-generator-core</artifactId>
            <version>1.3.7</version>
            <scope>provided</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.mybatis.generator</groupId>
                <artifactId>mybatis-generator-maven-plugin</artifactId>
                <version>1.3.7</version>

                <configuration>
                    <configurationFile>src/main/resources/mybatis-generator.xml</configurationFile>
                    <overwrite>true</overwrite>
                </configuration>

                <dependencies>
                    <dependency>
                        <groupId>mysql</groupId>
                        <artifactId>mysql-connector-java</artifactId>
                        <version>8.0.19</version>
                    </dependency>
                </dependencies>
            </plugin>
        </plugins>
    </build>



</project>

2. 编写mybatis-generator.xml配置文件

内容如下

<?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="MySql" defaultModelType="flat">

        <plugin type="org.mybatis.generator.plugins.SerializablePlugin" />

        <jdbcConnection
                driverClass="com.mysql.jdbc.Driver"
                connectionURL="jdbc:mysql://ip:3306/数据库名称"
                userId="数据库用户"
                password="数据库密码" />

        <javaModelGenerator targetPackage="cn.zxl.springbt_mybatis_generator.entity" targetProject="src/main/java"></javaModelGenerator>

        <sqlMapGenerator targetPackage="mapper"  targetProject="src/main/resources"></sqlMapGenerator>

        <javaClientGenerator targetPackage="cn.zxl.springbt_mybatis_generator.mapper" targetProject="src/main/java" type="XMLMAPPER"></javaClientGenerator>

        <table tableName="users">
            <property name="modelOnly" value="false"/>
        </table>
        <table tableName="chat_msg">
            <property name="modelOnly" value="false"/>
        </table>
        <table tableName="friends_request">
            <property name="modelOnly" value="false"/>
        </table>
        <table tableName="my_friends">
            <property name="modelOnly" value="false"/>
        </table>

    </context>

</generatorConfiguration>

上面 xml中几个关键的配置简介如下：

< jdbcConnection /> 数据库连接配置，至关重要
<javaModelGenerator /> 指定自动生成的 POJO置于哪个包下
<sqlMapGenerator /> 指定自动生成的 mapper.xml置于哪个包下
<javaClientGenerator /> 指定自动生成的 DAO接口置于哪个包下
<table /> 指定数据表名，可以使用_和%通配符

3. 双击maven视图中的指定插件运行

生成结果

官方文档：http://mybatis.org/generator/