本次项目,从来没有用过mybatis,之前用过hibernate jpa 和jdbcTemplate 。于是这次心血来潮用一下mybatis结合阿里巴巴的数据库监控druid。
本篇中的服务配置涉及springcloud,但是并不影响服务单独启动(报错不能注册到eureka服务器,但能正常使用)。有具体需要的同学可以将涉及springcloud的配置从pom.xml和yaml配置文件中去掉。
1.pom.xml文件
4.0.0
com.wlw
syngis-map
0.0.1-SNAPSHOT
jar
syngis-map
Demo project for Spring Boot
org.springframework.boot
spring-boot-starter-parent
1.5.4.RELEASE
UTF-8
UTF-8
1.8
org.springframework.boot
spring-boot-starter-web
org.springframework.boot
spring-boot-starter-test
test
org.springframework.boot
spring-boot-starter-actuator
1.5.7.RELEASE
org.springframework.boot
spring-boot-starter-data-jpa
junit
junit
com.alibaba
druid-spring-boot-starter
1.1.0
com.alibaba
fastjson
1.2.34
org.springframework
spring-test
RELEASE
org.springframework
spring-jdbc
4.3.9.RELEASE
compile
net.sourceforge.jexcelapi
jxl
2.6.12
javax.servlet
javax.servlet-api
3.0.1
com.microsoft.sqlserver
sqljdbc4
4.0
compile
commons-io
commons-io
2.4
org.springframework.cloud
spring-cloud-starter-eureka
1.3.5.RELEASE
org.springframework.cloud
spring-cloud-starter-feign
1.3.5.RELEASE
org.springframework.cloud
spring-cloud-starter-ribbon
1.3.5.RELEASE
org.springframework.boot
spring-boot-starter-tomcat
provided
org.apache.maven.plugins
maven-war-plugin
${project.artifactId}
org.springframework.boot
spring-boot-maven-plugin
true
2.application.yaml配置文件
#Tomcat配置
server:
context-path: /syngis-web-map
port: 8088
spring:
#jmx 配置 :打包成war包时避免和其他的springcloud服务冲突
jmx:
default-domain: syngis-web-map
enabled: true
domain: syngis-web-map
#应用名称
application:
name: syngis-web-map
#dataSourceConfiguration
datasource:
# 连接池普通配置
driver-class-name: com.microsoft.sqlserver.jdbc.SQLServerDriver
url: jdbc:sqlserver://localhost:1433;databaseName=DFSTrackData7
username: sa
password: sa
platform: sqlserver
type: com.alibaba.druid.pool.DruidDataSource
# 连接池补充配置
# 初始化大小,最小,最大
initialSize: 1
minIdle: 3
maxActive: 200
# 配置获取连接等待超时的时间
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
timeBetweenEvictionRunsMillis: 60000
# 配置一个连接在池中最小生存的时间,单位是毫秒
minEvictableIdleTimeMillis: 40000
validationQuery: select 'x'
testWhileIdle: true
testOnBorrow: false
testOnReturn: false
# 打开PSCache,并且指定每个连接上PSCache的大小
poolPreparedStatements: true
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
filters: stat,slf4j
# 通过connectProperties属性来打开mergeSql功能;慢SQL记录
connectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000
# 合并多个DruidDataSource的监控数据
useGlobalDataSourceStat: true
#springcloud配置
eureka:
client:
service-url:
defaultZone: http://localhost:8089/eureka/
instance:
prefer-ip-address: true
mybatis:
# mapper扫描路径
# mapper-locations: com.wlw.mapper
# 可以直接指定package的名字, mybatis会自动扫描你指定包下面的javabean,
type-aliases-package: com.wlw.entity
# 配置文件路径(已经在yaml配置,故不用)
# config-location:
configuration:
# 所有映射器中配置的缓存的全局开关
cache-enabled: false
# 延迟加载的全局开关 配置二级缓存时将此属性关闭
lazy-loading-enabled: false
# 关联对象加载 配置二级缓存时将此属性关闭
aggressive-lazy-loading: false
# 是否允许单一语句返回多结果集
multiple-result-sets-enabled: true
# 使用列标签代替列名
use-column-label: false
# 允许在嵌套语句中使用行分界
safe-row-bounds-enabled: false
# 允许 JDBC 支持自动生成主键,需要驱动兼容
use-generated-keys: false
# 指定 MyBatis 是否以及如何自动映射指定的列到字段或属性
auto-mapping-behavior: partial
# 配置默认的执行器
default-executor-type: simple
# 设置超时时间,它决定驱动等待数据库响应的秒数
default-statement-timeout: 30
# 是否开启自动驼峰命名规则映射
map-underscore-to-camel-case: false
# 利用本地缓存机制防止循环引用和加速重复嵌套查询 默认值为 SESSION,这种情况下会缓存一个会话中执行的所有查询
local-cache-scope: session
# 当没有为参数提供特定的 JDBC 类型时,为空值指定 JDBC 类型
jdbc-type-for-null: other
# 指定哪些对象的方法触发一次延迟加载
lazy-load-trigger-methods: equals,clone,hashCode,toString
3.服务主程序
// 启注解事务管理,等同于xml配置方式的
//@EnableTransactionManagement
// 通过注解配置factory-class
@EnableJpaRepositories(repositoryFactoryBeanClass = CustomRepositoryFactoryBean.class)
@EnableFeignClients
@EnableDiscoveryClient
@SpringBootApplication
@ServletComponentScan
//@MapperScan("com.wlw.mapper")这个为什么会注释,我会在7.Mapper类中提到
public class SyngisWebMapApplication {
public static void main(String[] args) {
SpringApplication.run(SyngisWebMapApplication.class, args);
}
}
4.durid配置类
/**
* Druid的监控统计页面的功能
* Created by Tomas on 2017/7/11.
*/
@Configuration
public class DruidConfiguration {
private static final Logger logger = LoggerFactory.getLogger(DruidConfiguration.class);
/**
* 使用DruidDataSourceBuilder创建数据源
* @return
*/
//@Primary在此表示替换springboot默认的数据源
//@Bean将DataSource注册到spring中
//ConfigurationProperties(prefix = "spring.datasource")
//使用application.yaml配置文件中spring.datasource开头的配置项
@Primary
@Bean
@ConfigurationProperties(prefix = "spring.datasource")
public DataSource druidDataSource() {
DruidDataSource datasource = new DruidDataSource();
return datasource;
}
/**
* JDBC Template 数据源
* 想使用jdbcTemplate的同学在这里写好就行
* @param dataSource
* @return
*/
@Bean
public JdbcTemplate jdbcTemplate(DataSource dataSource) {
return new JdbcTemplate(dataSource);
}
/**
* druid的监控地址、登录员、黑白名单设置
* @return
*/
@Bean
public ServletRegistrationBean druidServlet() {
logger.info("init Druid Servlet Configuration ");
ServletRegistrationBean servletRegistrationBean = new ServletRegistrationBean();
servletRegistrationBean.setServlet(new StatViewServlet());
servletRegistrationBean.addUrlMappings("/druid/*");
Map initParameters = new HashMap();
initParameters.put("loginUsername", "9999");// 用户名
initParameters.put("loginPassword", "1");// 密码
initParameters.put("resetEnable", "false");// 禁用HTML页面上的“Reset All”功能
initParameters.put("allow", ""); // IP白名单 (没有配置或者为空,则允许所有访问)
//initParameters.put("deny", "192.168.20.38");// IP黑名单 (存在共同时,deny优先于allow)
servletRegistrationBean.setInitParameters(initParameters);
return servletRegistrationBean;
}
/**
* druid的过滤器设置
* @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/*,*.properties");
return filterRegistrationBean;
}
}
5.mybatis配置类
/**
* mybatis配置类
* @author Tomas
* @date 2017/12/13
*/
@Configuration
@EnableTransactionManagement
// 添加上会产生警告main No MyBatis mapper was found in ....
// 原因是没有目录下没有mapper.xml文件或者@Mapper注解的类
//@MapperScan(basePackages = {"com.wlw.mapper"})
public class MyBatisConfig implements EnvironmentAware {
@Autowired
DataSource dataSource;
private RelaxedPropertyResolver propertyResolver;
@Bean(name = "sqlSessionFactory")
public SqlSessionFactory sqlSessionFactoryBean() {
try {
//ResourcePatternResolver resourcePatternResolver;
//resourcePatternResolver = new PathMatchingResourcePatternResolver();
// 注入DataSource,此处是我们使用的druid
SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
bean.setDataSource(dataSource);
// 在application.yaml 配置文件中的mybatis配置项中已经配置,所以此处注释
// bean.setTypeAliasesPackage(propertyResolver.getProperty("typeAliasesPackage"));
// bean.setMapperLocations(resourcePatternResolver.getResources(propertyResolver.getProperty("mapper-locations")));
// bean.setConfigLocation(new DefaultResourceLoader().getResource(propertyResolver.getProperty("configLocation")));
return bean.getObject();
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
/**
* 事物管理器
*/
@Bean
public PlatformTransactionManager platformTransactionManager() {
return new DataSourceTransactionManager(dataSource);
}
/**
* 这个类猜测应该是设置环境,具体得看过源码之后才了解
* Set the {@code Environment} that this object runs in.
* @param environment
*/
@Override
public void setEnvironment(Environment environment) {
this.propertyResolver = new RelaxedPropertyResolver(environment,"mybatis.");
}
6.javaBean类
@Entity
public class RecDescribe {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private String id;
private String guid;
private String did;
private String minX;
private String minY;
private String maxX;
private String maxY;
private String begTime;
private String endTime;
private String timeFlag;
@Override
public String toString() {
return "RecDescribe{" +
"id='" + id + '\'' +
", guid='" + guid + '\'' +
", did='" + did + '\'' +
", minX='" + minX + '\'' +
", minY='" + minY + '\'' +
", maxX='" + maxX + '\'' +
", maxY='" + maxY + '\'' +
", begTime='" + begTime + '\'' +
", endTime='" + endTime + '\'' +
", timeFlag='" + timeFlag + '\'' +
'}';
}
public RecDescribe() {
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getGuid() {
return guid;
}
public void setGuid(String guid) {
this.guid = guid;
}
public String getDid() {
return did;
}
public void setDid(String did) {
this.did = did;
}
public String getMinX() {
return minX;
}
public void setMinX(String minX) {
this.minX = minX;
}
public String getMinY() {
return minY;
}
public void setMinY(String minY) {
this.minY = minY;
}
public String getMaxX() {
return maxX;
}
public void setMaxX(String maxX) {
this.maxX = maxX;
}
public String getMaxY() {
return maxY;
}
public void setMaxY(String maxY) {
this.maxY = maxY;
}
public String getBegTime() {
return begTime;
}
public void setBegTime(String begTime) {
this.begTime = begTime;
}
public String getEndTime() {
return endTime;
}
public void setEndTime(String endTime) {
this.endTime = endTime;
}
public String getTimeFlag() {
return timeFlag;
}
public void setTimeFlag(String timeFlag) {
this.timeFlag = timeFlag;
}
}
7.Mapper类
此处我没有配置Mapp.xml文件,而是通过@Select注解将sql语句直接注入方法中。而且由于springboot本来的设计理念就是减少配置文件,降低开发人员的工作量。如果再向项目中添加Mapp.xml配置文件会让每个接口和每个映射文件必须对应,增加了耦合,更显得多余。
/* 1.此处@Maper作用是相当于起到一个mapper.xml配置文件的作用
* @Maper注解最好和配置文件中的 mapper-locations: com.wlw.mapper配合使用
* 或者配合启动类头上的@MapperScan("com.wlw.mapper")注解一起使用
* 如果此处没有@Mapper注解的话,在控制台中可能会报warn:main No MyBatis mapper was found in ....
*
* 2.@Repository注解是将Mapper作为Dao层的接口注入Spring中
* 如果此处没有它的话,在service中的
* @Autowired
* RecDescribeMapper recDescribeMapper;
* 会报错,但是不影响运行
*/
@Repository
@Mapper
public interface RecDescribeMapper {
// 不加@param注解会报错
// 方法参数我在下一篇文章会提到
@Select({"select * from RecDescribe where TimeFlag >= #{bF} and TimeFlag <= #{eF}"})
public List selectByTimeFlag(@Param("bF") String bF, @Param("eF") String eF);
}
8.service层调用
/**
* 查询gp数据类
* @author Thomas
*/
@Service
public class QueryServiceImpl implements QueryService {
@Autowired
RecDescribeMapper recDescribeMapper;
public List queryPeriodData(String moduleName, String bTime, String eTime) {
String bf = bTime.split(" ")[1].replace("-", "");
String ef = eTime.split(" ")[1].replace("-", "");
List recs = recDescribeMapper.selectByTimeFlag(bf, ef);
System.out.println(recs);
}
}
//最后控制台打印的数据
//[RecDescribe{id='cc6e6a70-b268-11e6-8521-61e5052161e5', guid='275475dd-cbd4-4274-a42b-2d140fbcd715', did='0259', minX='120.07340166.........
至此,mybatis springboot 和 druid的集合使用。其中有许多细节我已经在各处的注释中讲明,参Mapper数的问题将在下一章讨论。