spring-boot-通用mapper

数据源依赖

druid官方文档：https://github.com/alibaba/druid/wiki/常见问题

                <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>

        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.0.19</version>
        </dependency>

mybatis相关依赖及插件配置

<!--mybatis-->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.3.1</version>
        </dependency>
        <!--通用mapper-->
        <dependency>
            <groupId>tk.mybatis</groupId>
            <artifactId>mapper-spring-boot-starter</artifactId>
            <version>1.1.5</version>
        </dependency>
        <!--pagehelper 分页插件-->
        <dependency>
            <groupId>com.github.pagehelper</groupId>
            <artifactId>pagehelper-spring-boot-starter</artifactId>
            <version>1.2.3</version>
        </dependency>


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

            <!-- 要打包了这个生成代码要禁止掉，本地开发开启-->
            <plugin>
                <groupId>org.mybatis.generator</groupId>
                <artifactId>mybatis-generator-maven-plugin</artifactId>
                <version>1.3.5</version>
                <dependencies>
                    <!--
                    配置这个依赖主要是为了等下在配置mybatis-generator.xml的时候可以不用配置 classPathEntry 这样的一个属性，
                    避免代码的耦合度太高-->
                    <dependency>
                        <groupId>mysql</groupId>
                        <artifactId>mysql-connector-java</artifactId>
                        <version>5.1.44</version>
                    </dependency>
                    <dependency>
                        <groupId>tk.mybatis</groupId>
                        <artifactId>mapper</artifactId>
                        <version>3.4.0</version>
                    </dependency>
                </dependencies>
                <executions>
                    <execution>
                        <id>Generate MyBatis Artifacts</id>
                        <phase>package</phase>
                        <goals>
                            <goal>generate</goal>
                        </goals>
                    </execution>
                </executions>
                <configuration>
                    <!--允许移动生成的文件 -->
                    <verbose>true</verbose>
                    <!-- 是否覆盖 -->
                    <overwrite>true</overwrite>
                    <!-- 自动生成的配置 -->
                    <configurationFile>src/main/resources/mybatis-generator.xml</configurationFile>
                </configuration>
            </plugin>
        </plugins>
    </build>

对应的application.properties配置：

## 数据库访问配置
spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
spring.datasource.driver-class-name = com.mysql.jdbc.Driver
spring.datasource.url = jdbc:mysql://localhost:3306/spring?useUnicode=true&characterEncoding=utf-8
spring.datasource.username = root
spring.datasource.password = root

# 下面为连接池的补充设置，应用到上面所有数据源中
# 初始化大小，最小，最大
spring.datasource.initialSize=5
spring.datasource.minIdle=5
spring.datasource.maxActive=20
# 配置获取连接等待超时的时间
spring.datasource.maxWait=60000
# 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
spring.datasource.timeBetweenEvictionRunsMillis=60000
# 配置一个连接在池中最小生存的时间，单位是毫秒
spring.datasource.minEvictableIdleTimeMillis=300000
spring.datasource.validationQuery=SELECT 1 FROM DUAL
spring.datasource.testWhileIdle=true
spring.datasource.testOnBorrow=false
spring.datasource.testOnReturn=false
# 打开PSCache，并且指定每个连接上PSCache的大小
spring.datasource.poolPreparedStatements=true
spring.datasource.maxPoolPreparedStatementPerConnectionSize=20
# 配置监控统计拦截的filters，去掉后监控界面sql无法统计，'wall'用于防火墙
spring.datasource.filters=stat,wall,log4j
# 通过connectProperties属性来打开mergeSql功能；慢SQL记录
#spring.datasource.connectionProperties=druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000
# 合并多个DruidDataSource的监控数据
#spring.datasource.useGlobalDataSourceStat=true



#指定 domain bean所在包
mybatis.type-aliases-package=com.dudu.domain
#指定 mapper 映射文件
mybatis.mapperLocations=classpath:mapper/*.xml

#mapper
#mappers 多个接口时逗号隔开
mapper.mappers=com.dudu.util.MyMapper
mapper.not-empty=false
mapper.identity=MYSQL

#pagehelper
pagehelper.helperDialect=mysql
pagehelper.reasonable=true
pagehelper.supportMethodsArguments=true
pagehelper.params=count=countSql

bean 配置

@Configuration
public class DruidConfig {
    private Logger logger = LoggerFactory.getLogger(DruidConfig.class);

    @Value("${spring.datasource.url:#{null}}")
    private String dbUrl;
    @Value("${spring.datasource.username: #{null}}")
    private String username;
    @Value("${spring.datasource.password:#{null}}")
    private String password;
    @Value("${spring.datasource.driverClassName:#{null}}")
    private String driverClassName;
    @Value("${spring.datasource.initialSize:#{null}}")
    private Integer initialSize;
    @Value("${spring.datasource.minIdle:#{null}}")
    private Integer minIdle;
    @Value("${spring.datasource.maxActive:#{null}}")
    private Integer maxActive;
    @Value("${spring.datasource.maxWait:#{null}}")
    private Integer maxWait;
    @Value("${spring.datasource.timeBetweenEvictionRunsMillis:#{null}}")
    private Integer timeBetweenEvictionRunsMillis;
    @Value("${spring.datasource.minEvictableIdleTimeMillis:#{null}}")
    private Integer minEvictableIdleTimeMillis;
    @Value("${spring.datasource.validationQuery:#{null}}")
    private String validationQuery;
    @Value("${spring.datasource.testWhileIdle:#{null}}")
    private Boolean testWhileIdle;
    @Value("${spring.datasource.testOnBorrow:#{null}}")
    private Boolean testOnBorrow;
    @Value("${spring.datasource.testOnReturn:#{null}}")
    private Boolean testOnReturn;
    @Value("${spring.datasource.poolPreparedStatements:#{null}}")
    private Boolean poolPreparedStatements;
    @Value("${spring.datasource.maxPoolPreparedStatementPerConnectionSize:#{null}}")
    private Integer maxPoolPreparedStatementPerConnectionSize;
    @Value("${spring.datasource.filters:#{null}}")
    private String filters;
    @Value("{spring.datasource.connectionProperties:#{null}}")
    private String connectionProperties;

    /**
     * Druid 连接池配置
     *
     * @return
     */
    @Bean
    @Primary
    public DataSource dataSource() {
        DruidDataSource datasource = new DruidDataSource();

        datasource.setUrl(this.dbUrl);
        datasource.setUsername(username);
        datasource.setPassword(password);
        datasource.setDriverClassName(driverClassName);
        //configuration
        if (initialSize != null) {
            datasource.setInitialSize(initialSize);
        }
        if (minIdle != null) {
            datasource.setMinIdle(minIdle);
        }
        if (maxActive != null) {
            datasource.setMaxActive(maxActive);
        }
        if (maxWait != null) {
            datasource.setMaxWait(maxWait);
        }
        if (timeBetweenEvictionRunsMillis != null) {
            datasource.setTimeBetweenEvictionRunsMillis(timeBetweenEvictionRunsMillis);
        }
        if (minEvictableIdleTimeMillis != null) {
            datasource.setMinEvictableIdleTimeMillis(minEvictableIdleTimeMillis);
        }
        if (validationQuery != null) {
            datasource.setValidationQuery(validationQuery);
        }
        if (testWhileIdle != null) {
            datasource.setTestWhileIdle(testWhileIdle);
        }
        if (testOnBorrow != null) {
            datasource.setTestOnBorrow(testOnBorrow);
        }
        if (testOnReturn != null) {
            datasource.setTestOnReturn(testOnReturn);
        }
        if (poolPreparedStatements != null) {
            datasource.setPoolPreparedStatements(poolPreparedStatements);
        }
        if (maxPoolPreparedStatementPerConnectionSize != null) {
            datasource.setMaxPoolPreparedStatementPerConnectionSize(maxPoolPreparedStatementPerConnectionSize);
        }

        if (connectionProperties != null) {
            datasource.setConnectionProperties(connectionProperties);
        }

        List<Filter> filters = new ArrayList<>();
        filters.add(statFilter());
        filters.add(wallFilter());
        datasource.setProxyFilters(filters);

        return datasource;
    }

    /**
     * 注册 servlet
     *
     * @return
     */
    @Bean
    public ServletRegistrationBean druidServlet() {
        ServletRegistrationBean servletRegistrationBean =
                new ServletRegistrationBean(new StatViewServlet(), "/druid/*");

        //控制台管理用户，加入下面2行 进入druid后台就需要登录
        servletRegistrationBean.addInitParameter("loginUsername", "admin");
        servletRegistrationBean.addInitParameter("loginPassword", "admin");
        return servletRegistrationBean;
    }

    /**
     * 注册 filter
     *
     * @return
     */
    @Bean
    public FilterRegistrationBean filterRegistrationBean() {
        FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean();
        filterRegistrationBean.setFilter(new WebStatFilter());
        filterRegistrationBean.addUrlPatterns("/*");
        filterRegistrationBean.addInitParameter("exclusions",
                "*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*");
        filterRegistrationBean.addInitParameter("profileEnable", "true");
        return filterRegistrationBean;
    }

    @Bean
    public StatFilter statFilter() {
        StatFilter statFilter = new StatFilter();
        //slowSqlMillis用来配置SQL慢的标准，执行时间超过slowSqlMillis的就是慢。
        statFilter.setLogSlowSql(true);
        //SQL合并配置
        statFilter.setMergeSql(true);
        //slowSqlMillis的缺省值为3000，也就是3秒。
        statFilter.setSlowSqlMillis(1000);
        return statFilter;
    }

    @Bean
    public WallFilter wallFilter() {
        WallFilter wallFilter = new WallFilter();
        //允许执行多条SQL
        WallConfig config = new WallConfig();
        config.setMultiStatementAllow(true);
        wallFilter.setConfig(config);
        return wallFilter;
    }
}

通用Mapper配置 主要配置

通用Mapper插件网址：https://github.com/abel533/Mapper

可以放在 utils包中

public interface MyMapper<T> extends Mapper<T>, MySqlMapper<T> {
    //FIXME 特别注意，该接口不能被扫描到，否则会出错
}

这里实现一个自己的接口,继承通用的mapper，关键点就是这个接口不能被扫描到，不能跟dao这个存放mapper文件放在一起。
最后在启动类中通过MapperScan注解指定扫描的mapper路径：

@SpringBootApplication
@EnableTransactionManagement  // 启注解事务管理，等同于xml配置方式的 <tx:annotation-driven />
@MapperScan(basePackages = "com.dudu.dao", markerInterface = MyMapper.class)
public class Application {

    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}

MyBatis Generator配置

mybatis-generator.xml文件,该配置文件用来自动生成表对应的Model,Mapper以及xml,该文件位于src/main/resources下面

Mybatis Geneator 详解: http://blog.csdn.net/isea533/article/details/42102297

<?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>

    <!--加载配置文件，为下面读取数据库信息准备-->
    <properties resource="application.properties"/>

    <context id="Mysql" targetRuntime="MyBatis3Simple" defaultModelType="flat">

        <plugin type="tk.mybatis.mapper.generator.MapperPlugin">
            <property name="mappers" value="com.dudu.util.MyMapper"/>
            <!-- caseSensitive 默认false，当数据库表名区分大小写时，可以将该属性设置为true-->
            <property name="caseSensitive" value="true"/>
        </plugin>

        <!-- 阻止生成自动注释 -->
        <commentGenerator>
            <property name="javaFileEncoding" value="UTF-8"/>
            <property name="suppressDate" value="true"/>
            <property name="suppressAllComments" value="true"/>
        </commentGenerator>

        <!--数据库链接地址账号密码-->
        <jdbcConnection driverClass="${spring.datasource.driver-class-name}"
                        connectionURL="${spring.datasource.url}"
                        userId="${spring.datasource.username}"
                        password="${spring.datasource.password}">
        </jdbcConnection>

        <javaTypeResolver>
            <property name="forceBigDecimals" value="false"/>
        </javaTypeResolver>

        <!--生成Model类存放位置-->
        <javaModelGenerator targetPackage="com.dudu.domain" targetProject="src/main/java">
            <property name="enableSubPackages" value="true"/>
            <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-->
        <!-- 客户端代码，生成易于使用的针对Model对象和XML配置文件 的代码
                type="ANNOTATEDMAPPER",生成Java Model 和基于注解的Mapper对象
                type="XMLMAPPER",生成SQLMap XML文件和独立的Mapper接口
        -->
        <javaClientGenerator type="XMLMAPPER" targetPackage="com.dudu.dao" targetProject="src/main/java">
            <property name="enableSubPackages" value="true"/>
        </javaClientGenerator>

        <!--生成对应表及类名

            去掉Mybatis Generator生成的一堆 example
        -->
        <table tableName="LEARN_RESOURCE" domainObjectName="LearnResource" enableCountByExample="false"
               enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false"
               selectByExampleQueryId="false">
            <generatedKey column="id" sqlStatement="Mysql" identity="true"/>
        </table>
    </context>
</generatorConfiguration>