mybatis-generator 自动生成mybatis代码与xml

javamagicsun 2020-04-18

一、pxm.xml中引入mybatis-generator并配置

在build节点下的plugins下添加org.mybatis.generator 示例代码如下:

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.2.6.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.dcrenl.test</groupId>
    <artifactId>test</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>test</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.1.2</version>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>

            <plugin>
                <groupId>org.mybatis.generator</groupId>
                <artifactId>mybatis-generator-maven-plugin</artifactId>
                <configuration>
                    <configurationFile>src/main/resources/generatorConfig.xml</configurationFile>
                    <verbose>true</verbose>
                    <overwrite>true</overwrite>
                </configuration>
                <!--加入下面这个依赖-->
                <dependencies>
                    <dependency>
                        <groupId>mysql</groupId>
                        <artifactId>mysql-connector-java</artifactId>
                        <version>${mysql.version}</version>
                    </dependency>
                </dependencies>
            </plugin>

        </plugins>
    </build>

</project>

二、在resources文件夹下新建mybatis-generator配置xml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">
<!-- 配置生成器 -->
<generatorConfiguration>

    <!--classPathEntry:数据库的JDBC驱动,换成你自己的驱动位置 可选 -->
<!--    <classPathEntry location="C:\Users\dcrenl\.m2\repository\mysql\mysql-connector-java\8.0.19\mysql-connector-java-8.0.19.jar"/>-->

    <!-- 一个数据库一个context,defaultModelType="flat" 大数据字段,不分表 -->
    <context id="MysqlTables" targetRuntime="MyBatis3" defaultModelType="flat">

        <!-- 自动识别数据库关键字,默认false,如果设置为true,根据SqlReservedWords中定义的关键字列表;一般保留默认值,遇到数据库关键字(Java关键字),使用columnOverride覆盖 -->
        <property name="autoDelimitKeywords" value="true"/>

        <!-- 生成的Java文件的编码 -->
        <property name="javaFileEncoding" value="utf-8"/>

        <!-- beginningDelimiter和endingDelimiter:指明数据库的用于标记数据库对象名的符号,比如ORACLE就是双引号,MYSQL默认是`反引号; -->
        <property name="beginningDelimiter" value="`"/>
        <property name="endingDelimiter" value="`"/>

        <!-- 格式化java代码 -->
        <property name="javaFormatter" value="org.mybatis.generator.api.dom.DefaultJavaFormatter"/>

        <!-- 格式化XML代码 -->
        <property name="xmlFormatter" value="org.mybatis.generator.api.dom.DefaultXmlFormatter"/>
        <plugin type="org.mybatis.generator.plugins.SerializablePlugin"/>
        <plugin type="org.mybatis.generator.plugins.ToStringPlugin"/>

        <!-- 注释 -->
        <commentGenerator>
            <property name="suppressAllComments" value="true"/><!-- 是否取消注释 -->
            <property name="suppressDate" value="false"/> <!-- 是否生成注释代时间戳-->
        </commentGenerator>

        <!-- jdbc连接-->
        <jdbcConnection driverClass="com.mysql.cj.jdbc.Driver"
                        connectionURL="jdbc:mysql://localhost:3306/test?serverTimezone=UTC&amp;setUnicode=true&amp;characterEncoding=utf8" userId="root"
                        password="root">
            <!-- 防止生成其它库的表 -->
            <property name="nullCatalogMeansCurrent" value="true"/>
        </jdbcConnection>

        <!-- 类型转换 -->
        <javaTypeResolver>
            <!-- 是否使用bigDecimal, false可自动转化以下类型(Long, Integer, Short, etc.) -->
            <property name="forceBigDecimals" value="false"/>
        </javaTypeResolver>

        <!-- 生成实体类地址 -->
        <javaModelGenerator targetPackage="com.dcrenl.examinersystem.entity" targetProject="src/main/java">
            <!-- 是否让schema作为包的后缀 -->
            <property name="enableSubPackages" value="false"/>
            <!-- 从数据库返回的值去掉前后空格 -->
            <property name="trimStrings" value="true"/>
        </javaModelGenerator>

        <!-- 生成map.xml文件存放地址 -->
        <sqlMapGenerator targetPackage="mapper" targetProject="src/main/resources">
            <property name="enableSubPackages" value="false"/>
        </sqlMapGenerator>

        <!-- 生成接口dao(mapper) -->
        <javaClientGenerator targetPackage="com.dcrenl.examinersystem.mapper" targetProject="src/main/java" type="XMLMAPPER">
            <property name="enableSubPackages" value="false"/>
            <property name="nullCatalogMeansCurrent" value="true"/>
        </javaClientGenerator>

        <!-- table可以有多个,每个数据库中的表都可以写一个table,tableName表示要匹配的数据库表,也可以在tableName属性中通过使用%通配符来匹配所有数据库表,只有匹配的表才会自动生成文件 enableSelectByPrimaryKey相应的配置表示是否生成相应的接口 -->
        <table tableName="t_%"
               enableCountByExample="false"
               enableUpdateByExample="false"
               enableDeleteByExample="false"
               enableSelectByExample="false"
               selectByExampleQueryId="false"
               enableSelectByPrimaryKey="true"
               enableUpdateByPrimaryKey="true"
               enableDeleteByPrimaryKey="true"
        >
            <property name="useActualColumnNames" value="false"/>
        </table>

    </context>
</generatorConfiguration>

三、点击IDEA右侧“Maven”栏目,在“Plugins”中找到“mybatis-generator”展开找到“mybatis-generator:generate”,右键,“Run Maven Build” 生成

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