springboot- 通用mapper和mybatis-generator

实现功能：根据数据库中的表，自动生成model、dao和对应的xml文件。xml中实现通用mapper中CURD功能

1、引入依赖

    <properties>
        <mybatis.generator.version>1.3.7</mybatis.generator.version>
        <tk.mybatis.version>4.1.5</tk.mybatis.version>
    </properties>

    <dependencies>
       <!--mybatis-->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.1.3</version>
        </dependency>
       <!--通用mapper-->
        <dependency>
            <groupId>tk.mybatis</groupId>
            <artifactId>mapper</artifactId>
            <version>${tk.mybatis.version}</version>
        </dependency>
       <!--mybatis-generator-->
        <dependency>
            <groupId>org.mybatis.generator</groupId>
            <artifactId>mybatis-generator-core</artifactId>
            <version>${mybatis.generator.version}</version>
        </dependency>

      <!--mysql数据库-->
      <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
      <!--druid数据源-->      
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>1.1.10</version>
        </dependency>
    <dependencies>

      <build>
        <plugins>

            <!--配置Maven中 mybatis-generator 插件-->
            <!--加入tk.mybatis的依赖-->
            <plugin>
                <groupId>org.mybatis.generator</groupId>
                <artifactId>mybatis-generator-maven-plugin</artifactId>
                <version>${mybatis.generator.version}</version>
                <configuration>
                    <!--可移动-->
                    <verbose>true</verbose>
                    <!--可覆盖-->
                    <overwrite>true</overwrite>
                </configuration>
                <dependencies>
                    <dependency>
                        <groupId>tk.mybatis</groupId>
                        <artifactId>mapper</artifactId>
                        <version>${tk.mybatis.version}</version>
                    </dependency>
                </dependencies>
            </plugin>

        </plugins>
    </build>

2、配置通用mapper

方式1：配置要扫描的mapper

@SpringBootApplication
@MapperScan(basePackages = "com.liang.mapper")
public class MyappApplication {
    public static void main(String[] args) {
        SpringApplication.run(MyappApplication.class, args);
    }

}

方式2：扫描的mapper

@Configuration
public class MybatisConfig {
    @Bean(name = "mapperScannerConfigurer")
    public MapperScannerConfigurer MapperScannerConfigurer1() {
        MapperScannerConfigurer mapperScannerConfigurer = new MapperScannerConfigurer();
        mapperScannerConfigurer.setBasePackage("com.liang.mapper");
        Properties properties = new Properties();
        properties.setProperty("notEmpty", "false");
        properties.setProperty("IDENTITY", "MYSQL");
        properties.setProperty("mappers", Mapper.class.getName());
        mapperScannerConfigurer.setSqlSessionFactoryBeanName("sqlSessionFactory");
        mapperScannerConfigurer.setProperties(properties);
        return mapperScannerConfigurer;
    }
}

3、application.yaml中配置mybatis

#Mybatis（注意不是 mybatis.config-location 这个配置）
mybatis:
  mapper-locations: classpath:mapper/*.xml
  type-aliases-package: com.liang.pojo
  configuration-properties: {
    notEmpty: false,
    IDENTITY: 'MYSQL',
    mappers: "tk.mybatis.mapper.common.Mapper"
  }

4、添加generatorConfig.xml

<?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>
    <!-- 数据库驱动-->
    <classPathEntry location="E:\ideaMaven\MavenRepository\mysql\mysql-connector-java\8.0.22\mysql-connector-java-8.0.22.jar" />

    <context id="DB2Tables" targetRuntime="MyBatis3Simple">

        <!--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>
        <property name="endingDelimiter" value="`"></property>

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

        <!--添加Tk-mapper插件-->
        <plugin type="tk.mybatis.mapper.generator.MapperPlugin" >
            <property name="mappers" value="tk.mybatis.mapper.common.Mapper"/>
        </plugin>

        <jdbcConnection driverClass="com.mysql.cj.jdbc.Driver"
                        connectionURL="jdbc:mysql://localhost:3306/temp_db?serverTimezone=Asia/Shanghai&amp;characterEncoding=utf-8&amp;useUnicode=true&amp;useSSL=false"
                        userId="root"
                        password="123456">
        </jdbcConnection>

        <!-- java类型处理器 用于处理DB中的类型到Java中的类型，默认使用JavaTypeResolverDefaultImpl； 注意一点，默认会先尝试使用Integer，Long，Short等来对应DECIMAL和 NUMERIC数据类型； -->
        <javaTypeResolver >
            <property name="forceBigDecimals" value="false" />
        </javaTypeResolver>

        <!--生成entity类存放位置-->
        <javaModelGenerator targetPackage="com.liang.pojo" targetProject="src/main/java">
            <property name="enableSubPackages" value="false" />
            <property name="trimStrings" value="true" />
        </javaModelGenerator>

        <!--生成映射文件存放位置 -->
        <sqlMapGenerator targetPackage="mapper"  targetProject="src/main/resources">
            <property name="enableSubPackages" value="true" />
        </sqlMapGenerator>

        <!--生成Dao类存放位置-->
        <javaClientGenerator type="XMLMAPPER" targetPackage="com.liang.mapper"  targetProject="src/main/java">
            <property name="enableSubPackages" value="true" />
        </javaClientGenerator>

        <!--要生成的Table,注意不同的数据库，sqlStatement-->
        <!--sqlStatement 不同的数据库配置 http://mybatis.org/generator/configreference/generatedKey.html-->
        <table domainObjectName="School2" tableName="t_school">
            <!--<generatedKey column="id" sqlStatement="MySql" identity="true" />-->
            <generatedKey column="id" sqlStatement="SELECT LAST_INSERT_ID() AS id" identity="true"  />
        </table>
    </context>
</generatorConfiguration>

5、完成