mybatis mysql merge into_整合DRUID資料源+MyBatis

整合DRUID資料源

實際的開發中，我們很少用上面那種方式的資料源。

引入DruidDataSource：

com.alibaba

druid

1.1.8

配置：

type: com.alibaba.druid.pool.DruidDataSource

# 一些沒整明白的基本配置，連接配接池啥的，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

# 配置監控統計攔截的filters，去掉後監控界面sql無法統計，'wall'用于防火牆

filters: stat,wall,log4j

maxPoolPreparedStatementPerConnectionSize: 20

useGlobalDataSourceStat: true

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

基本配置的這些屬性是和DataSourceProperties對應的，但這裡配置了還不能夠用到，還需要一個Configuration，目的是不使用反射的自動建立，自己建立并綁定屬性。

@Configuration

public class DruidConfig {

@ConfigurationProperties(prefix = "spring.datasource")

@Bean

public DataSource druid() {

return new DruidDataSource();

}

//配置Druid的監控

//1、配置一個管理背景的Servlet

@Bean

public ServletRegistrationBean statViewServlet() {

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

@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);

建立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，我們的資料庫中表的字段名稱和javaBean中屬性名是一緻的，如果改動了，則不能夠比對，者就需要一個配置檔案或者配置類來解決這個問題。

建立MyBatisConfig類，使用自定義MyBatis的配置規則

@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批量掃描。

配置檔案的方式

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">

當然還是需要mapper的

@Mapper

public interface EmployeeMapper {

public Employee getEmpById(Integer id);

public void insertEmp(Employee employee);

}

重要的一點，需要在yml檔案中配置

mybatis:

mapper-locations: classpath:mybatis/mapper/*.xml 指定映射檔案配置位置

config-location: classpath:mybatis/mybatis-config.xml 指定全局檔案配置

運作測試的過程中，又出現了之前的異常

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

這次換用另一種方式解決，不使用指令 set global time_zone='+8:00' ;來解決，而是在資料庫驅動url後面添加serverTimezone=UTC，也能解決這個問題。

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