Spring Cloud集成 Mybatis-plus使用

一、Mybatis-plus介绍

Mybatis-plus是基于Mybatis开发的开源框架

Mybatis-plus封装了分页、条件查询等内容

Mybatis-helper可以协议我们更好的使用Mybatis框架

二、Mybatis-plus配置

1、在父工程的pom.xml的dependencyManagement中增加。

这里只做依赖的管理

<dependencyManagement>
		<dependencies>
			<dependency>
				<groupId>org.springframework.cloud</groupId>
				<artifactId>spring-cloud-dependencies</artifactId>
				<version>${spring-cloud.version}</version>
				<type>pom</type>
				<scope>import</scope>
			</dependency>

			<!-- Mybatis-plus时引入的配置start -->
			<!--mybatis-plus依赖-->
			<dependency>
				<groupId>com.baomidou</groupId>
				<artifactId>mybatis-plus-boot-starter</artifactId>
				<version>${mybatis.plus.version}</version>
			</dependency>

			<!--数据源驱动-->
			<dependency>
				<groupId>mysql</groupId>
				<artifactId>mysql-connector-java</artifactId>
				<version>${mysql.version}</version>
			</dependency>

			<!-- Druid引入 -->
			<dependency>
				<groupId>com.alibaba</groupId>
				<artifactId>druid-spring-boot-starter</artifactId>
				<version>${druid.version}</version>
			</dependency>

			<!--代码生成器-->
			<dependency>
				<groupId>com.baomidou</groupId>
				<artifactId>mybatis-plus-generator</artifactId>
				<version>${mybatis.plus.version}</version>
			</dependency>


			<dependency>
				<groupId>com.ibeetl</groupId>
				<artifactId>beetl</artifactId>
				<version>${beetl.version}</version>
			</dependency>

			<!--日志依赖框架-->
			<dependency>
				<groupId>log4j</groupId>
				<artifactId>log4j</artifactId>
				<version>${log4j.version}</version>
			</dependency>
			<!--Mybatis-plus时引入配置结束-->

		</dependencies>
	</dependencyManagement>

　　

　　

2、然后backend_common的pom.xml中增加mybatis-plus相关的依赖

	<!--mybatis-plus依赖-->
		<dependency>
			<groupId>com.baomidou</groupId>
			<artifactId>mybatis-plus-boot-starter</artifactId>
		</dependency>

		<!-- Druid引入 -->
		<dependency>
			<groupId>com.alibaba</groupId>
			<artifactId>druid-spring-boot-starter</artifactId>
		</dependency>

		<!--数据源驱动-->
		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
		</dependency>

		<!--代码生成器-->
		<dependency>
			<groupId>com.baomidou</groupId>
			<artifactId>mybatis-plus-generator</artifactId>
		</dependency>

		<dependency>
			<groupId>com.ibeetl</groupId>
			<artifactId>beetl</artifactId>
		</dependency>

		<!--日志依赖框架-->
		<dependency>
			<groupId>log4j</groupId>
			<artifactId>log4j</artifactId>
		</dependency>
		<!--mybatis-plus依赖 结束-->
	</dependencies>

　　

　　

在build下增加recources，目的在打包的时候，把java下面的所有xml文件打在src/main/resources文件夹下

3、在工程backend_common 增加Mybatis-plus配置

1）MybatisPlusConfig 配置文件

@Configuration
@EnableTransactionManagement
@MapperScan(basePackages = {"com.example.demo.common.**.dao.mapper"})
public class MybatisPlusConfig {

    @Bean
    public DruidDataSource dataSource(DruidProperties druidProperties) {
        DruidDataSource dataSource = new DruidDataSource();
        druidProperties.config(dataSource);
        return dataSource;
    }

    /**
     * mybatis-plus分页插件
     */
    @Bean
    public PaginationInterceptor paginationInterceptor() {
        return new PaginationInterceptor();
    }

    /**
     * 乐观锁mybatis插件
     */
    @Bean
    public OptimisticLockerInterceptor optimisticLockerInterceptor() {
        return new OptimisticLockerInterceptor();
    }


}

　　

2)、DruidProperties 配置文件

@Data
@Configuration
@ConfigurationProperties(prefix = "spring.datasource")
public class DruidProperties {

    private String url = "jdbc:mysql://127.0.0.1:3306/backend_user_t?autoReconnect=true&useUnicode=true&characterEncoding=utf8&zeroDateTimeBehavior=CONVERT_TO_NULL&useSSL=false&serverTimezone=UTC";

    private String username = "root";

    private String password = "123456";

    private String driverClassName = "com.mysql.cj.jdbc.Driver";

    private Integer initialSize = 2;

    private Integer minIdle = 1;

    private Integer maxActive = 20;

    private Integer maxWait = 60000;

    private Integer timeBetweenEvictionRunsMillis = 60000;

    private Integer minEvictableIdleTimeMillis = 300000;

    private String validationQuery = "SELECT 'x'";

    private Boolean testWhileIdle = true;

    private Boolean testOnBorrow = false;

    private Boolean testOnReturn = false;

    private Boolean poolPreparedStatements = true;

    private Integer maxPoolPreparedStatementPerConnectionSize = 20;

    private String filters = "stat";

    public void config(DruidDataSource dataSource) {

        dataSource.setUrl(url);
        dataSource.setUsername(username);
        dataSource.setPassword(password);

        dataSource.setDriverClassName(driverClassName);
        dataSource.setInitialSize(initialSize);     //定义初始连接数
        dataSource.setMinIdle(minIdle);             //最小空闲
        dataSource.setMaxActive(maxActive);         //定义最大连接数
        dataSource.setMaxWait(maxWait);             //最长等待时间

        // 配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒
        dataSource.setTimeBetweenEvictionRunsMillis(timeBetweenEvictionRunsMillis);

        // 配置一个连接在池中最小生存的时间，单位是毫秒
        dataSource.setMinEvictableIdleTimeMillis(minEvictableIdleTimeMillis);
        dataSource.setValidationQuery(validationQuery);
        dataSource.setTestWhileIdle(testWhileIdle);
        dataSource.setTestOnBorrow(testOnBorrow);
        dataSource.setTestOnReturn(testOnReturn);

        // 打开PSCache，并且指定每个连接上PSCache的大小
        dataSource.setPoolPreparedStatements(poolPreparedStatements);
        dataSource.setMaxPoolPreparedStatementPerConnectionSize(maxPoolPreparedStatementPerConnectionSize);

        try {
            dataSource.setFilters(filters);
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }

}

　　

　　

3)数据层内容生成

/*
    数据层内容生成
 */
public class EntityGenerator {

    // 生成输出目录，定位到工程的java目录下
    private String outputDir = "D:\workspace\springboot\backend_parent\backend_common\src\main\java";
    // 生成类的作者
    private String author = "nick";
    // 数据源相关配置
    private String url = "jdbc:mysql://127.0.0.1:3306/springclouddeep?autoReconnect=true&useUnicode=true&characterEncoding=utf8&zeroDateTimeBehavior=CONVERT_TO_NULL&useSSL=false&serverTimezone=UTC";
    private String driverName = "com.mysql.cj.jdbc.Driver";
    private String userName = "root";
    private String userPwd = "123456";
    // DAO的包路径
    private String daoPackage = "com.example.demo.common";
    // 待生成的表名，注意是覆盖更新
    private static String[] tableNames;

    static{
        tableNames = new String[]{
                "backend_user_t"
        };
    }

    public static void main(String[] args) {
        EntityGenerator entityGenerator = new EntityGenerator();
        entityGenerator.entityGenerator();
    }

    //@Test
    public void entityGenerator() {
        AutoGenerator mpg = new AutoGenerator();
        mpg.setTemplateEngine(new BeetlTemplateEngine());
        // 全局配置
        GlobalConfig gc = new GlobalConfig();
        gc.setOutputDir(outputDir);
        gc.setFileOverride(true);
        gc.setActiveRecord(true);
        gc.setEnableCache(false);
        gc.setBaseResultMap(true);
        gc.setBaseColumnList(false);
        gc.setAuthor(author);
        mpg.setGlobalConfig(gc);

        // 数据源配置
        DataSourceConfig dsc = new DataSourceConfig();
        dsc.setUrl(url);
        // dsc.setSchemaName("public");
        dsc.setDriverName(driverName);
        dsc.setUsername(userName);
        dsc.setPassword(userPwd);
        mpg.setDataSource(dsc);

        // 策略配置
        StrategyConfig strategy = new StrategyConfig();
        //strategy.setTablePrefix(new String[]{"_"});// 此处可以修改为您的表前缀
        strategy.setNaming(NamingStrategy.underline_to_camel);// 表名生成策略
        strategy.setInclude(tableNames);
        mpg.setStrategy(strategy);

        // 包配置
        PackageConfig pc = new PackageConfig();
        pc.setParent(null);
        pc.setEntity(daoPackage+".entity");
        pc.setMapper(daoPackage+".mapper");
        pc.setXml(daoPackage+".mapper.xml");
        mpg.setPackageInfo(pc);

        // 注入自定义配置，可以在 VM 中使用 cfg.abc 设置的值
        InjectionConfig cfg = new InjectionConfig() {
            @Override
            public void initMap() {
                Map<String, Object> map = new HashMap<>();
                map.put("abc", this.getConfig().getGlobalConfig().getAuthor() + "-mp");
                this.setMap(map);
            }
        };

        mpg.setCfg(cfg);

        // 执行生成
        mpg.execute();

        // 打印注入设置
        System.err.println(mpg.getCfg().getMap().get("abc"));

    }

}

　　

然后运行main方法。生成的文件如下图所示