整合DRUID数据源

实际的开发中，我们很少用上面那种方式的数据源。

引入DruidDataSource：

com.alibaba

druid

1.1.8

配置：

type: com.alibaba.druid.pool.DruidDataSource

# 一些没整明白的基本配置，连接池啥的，慢慢整

initialSize: 5

minIdle: 5

maxActive: 20

maxWait: 60000

timeBetweenEvictionRunsMillis: 60000

minEvictableIdleTimeMillis: 300000

validationQuery: SELECT 1 FROM DUAL

testWhileIdle: true

testOnBorrow: false

testOnReturn: false

poolPreparedStatements: true

# 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

filters: stat,wall,log4j

maxPoolPreparedStatementPerConnectionSize: 20

useGlobalDataSourceStat: true

connectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=500

基本配置的这些属性是和DataSourceProperties对应的，但这里配置了还不能够用到，还需要一个Configuration，目的是不使用反射的自动创建，自己创建并绑定属性。

@Configuration

public class DruidConfig {

@ConfigurationProperties(prefix = "spring.datasource")

@Bean

public DataSource druid() {

return new DruidDataSource();

}

//配置Druid的监控

//1、配置一个管理后台的Servlet

@Bean

public ServletRegistrationBean statViewServlet() {

ServletRegistrationBean bean = new ServletRegistrationBean(new StatViewServlet(), "/druid/*");

//初始化参数

Map initParams = new HashMap<>();

initParams.put("loginUsername", "root");

initParams.put("loginPassword", "root");

initParams.put("allow", "");//允许所有

initParams.put("deny", "36.1.52.144");//拒绝

bean.setInitParameters(initParams);

return bean;

}

//2、配置一个web监控的filter

@Bean

public FilterRegistrationBean webStatFilter() {

FilterRegistrationBean bean = new FilterRegistrationBean();

bean.setFilter(new WebStatFilter());

Map initParams = new HashMap<>();

initParams.put("exclusions", "*.js,*.css,/druid/*");

bean.setInitParameters(initParams);

bean.setUrlPatterns(Arrays.asList("/*"));

return bean;

}

}

整合MyBatis

引入：

org.mybatis.spring.boot

mybatis-spring-boot-starter

1.3.2

创建数据库

创建Java Bean

使用MyBatis进行数据操作

使用注解版的使用：

创建mapper

/**

* @Mapper 指定这是一个操作数据库的mapper

*/

@Mapper

public interface DepartmentMapper {

@Select("select * from department where id=#{id}")

public Department getDeptById(Integer id);

@Delete("delete from department where id=#{id}")

public int deleteDeptById(Integer id);

@Options(useGeneratedKeys = true, keyProperty = "id")

@Insert("insert into department(departmentName) values(#{departmentName})")

public int insertDept(Department department);

@Update("update department set departmentName=#{departmentName} where id=#{id}")

public int updateDept(Department department);

创建Controller

@RestController

public class DeptController {

@Autowired

DepartmentMapper departmentMapper;

@GetMapping("/dept/{id}")

public Department getDept(@PathVariable("id") Integer id) {

return departmentMapper.getDeptById(id);

}

@GetMapping("/dept")

public Department insert(Department department) {

departmentMapper.insertDept(department);

return department;

}

}

目前，我们的数据库中表的字段名称和javaBean中属性名是一致的，如果改动了，则不能够匹配，者就需要一个配置文件或者配置类来解决这个问题。

创建MyBatisConfig类，使用自定义MyBatis的配置规则

@org.springframework.context.annotation.Configuration

public class MyBatisConfig {

@Bean

public ConfigurationCustomizer configurationCustomizer(){

return new ConfigurationCustomizer() {

@Override

public void customize(Configuration configuration) {

configuration.setMapUnderscoreToCamelCase(true);

}

};

}

}

可以使用 @MapperScan批量扫描。

配置文件的方式

EmployeeMapper.xml

/p>

PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"

"http://mybatis.org/dtd/mybatis-3-mapper.dtd">

SELECT * FROM employee WHERE id=#{id}

INSERT INTO employee(lastName,email,gender,d_id) VALUES (#{lastName},#{email},#{gender},#{dId})

mybatis.config.xml

/p>

PUBLIC "-//mybatis.org//DTD Config 3.0//EN"

"http://mybatis.org/dtd/mybatis-3-config.dtd">

当然还是需要mapper的

@Mapper

public interface EmployeeMapper {

public Employee getEmpById(Integer id);

public void insertEmp(Employee employee);

}

重要的一点，需要在yml文件中配置

mybatis:

mapper-locations: classpath:mybatis/mapper/*.xml 指定映射文件配置位置

config-location: classpath:mybatis/mybatis-config.xml 指定全局文件配置

运行测试的过程中，又出现了之前的异常

java.sql.SQLException: The server time zone value 'Öйú±ê׼ʱ¼ä' is unrecognized or represents more than one time

这次换用另一种方式解决，不使用命令 set global time_zone='+8:00' ;来解决，而是在数据库驱动url后面添加serverTimezone=UTC，也能解决这个问题。

url: jdbc:mysql://36.1.52.145:3306/jdbc?serverTimezone=UTC