我对Spring启动很新，我想为我的项目创建一个多数据源。 这是我目前的情况。我有两个用于多个数据库的实体包。我们说
com.test.entity.db.mysql ; for entities that belong to MySql
com.test.entity.db.h2 ; for entities that belong to H2 Databases
所以，目前我有两个实体类
UserMySql.java
@Entity
@Table(name="usermysql")
public class UserMysql{
@Id
@GeneratedValue
public int id;
public String name;
}
UserH2.java
@Entity
@Table(name="userh2")
public class Userh2 {
@Id
@GeneratedValue
public int id;
public String name;
}
我想实现一个配置，如果我从UserMySql创建用户，它将被保存到MySql数据库，如果我从Userh2创建用户，它将被保存到H2数据库。所以，我也有两个DBConfig，比方说MySqlDbConfig和H2DbConfig。
（com.test.model是我将放置我的Repositories类的包。它将在下面定义）
MySqlDbConfig.java
@Configuration
@EnableJpaRepositories(
basePackages="com.test.model",
entityManagerFactoryRef = "mysqlEntityManager")
public class MySqlDBConfig {
@Bean
@Primary
@ConfigurationProperties(prefix="datasource.test.mysql")
public DataSource mysqlDataSource(){
return DataSourceBuilder
.create()
.build();
}
@Bean(name="mysqlEntityManager")
public LocalContainerEntityManagerFactoryBean mySqlEntityManagerFactory(
EntityManagerFactoryBuilder builder){
return builder.dataSource(mysqlDataSource())
.packages("com.test.entity.db.mysql")
.build();
}
}
H2DbConfig.java
@Configuration
@EnableJpaRepositories(
entityManagerFactoryRef = "h2EntityManager")
public class H2DbConfig {
@Bean
@ConfigurationProperties(prefix="datasource.test.h2")
public DataSource h2DataSource(){
return DataSourceBuilder
.create()
.driverClassName("org.h2.Driver")
.build();
}
@Bean(name="h2EntityManager")
public LocalContainerEntityManagerFactoryBean h2EntityManagerFactory(
EntityManagerFactoryBuilder builder){
return builder.dataSource(h2DataSource())
.packages("com.test.entity.db.h2")
.build();
}
}
我的application.properties文件
#DataSource settings for mysql
datasource.test.mysql.jdbcUrl = jdbc:mysql://127.0.0.1:3306/test
datasource.test.mysql.username = root
datasource.test.mysql.password = root
datasource.test.mysql.driverClassName = com.mysql.jdbc.Driver
#DataSource settings for H2
datasource.test.h2.jdbcUrl = jdbc:h2:~/test
datasource.test.h2.username = sa
# DataSource settings: set here configurations for the database connection
spring.datasource.url = jdbc:mysql://127.0.0.1:3306/test
spring.datasource.username = root
spring.datasource.password = root
spring.datasource.driverClassName = com.mysql.jdbc.Driver
spring.datasource.validation-query=SELECT 1
# Specify the DBMS
spring.jpa.database = MYSQL
# Show or not log for each sql query
spring.jpa.show-sql = true
# Hibernate settings are prefixed with spring.jpa.hibernate.*
spring.jpa.hibernate.ddl-auto = update
spring.jpa.hibernate.dialect = org.hibernate.dialect.MySQL5Dialect
spring.jpa.hibernate.naming_strategy = org.hibernate.cfg.ImprovedNamingStrategy
spring.jpa.hibernate.show_sql = true
spring.jpa.hibernate.format_sql = true
server.port=8080
endpoints.shutdown.enabled=false
然后对于crud我有UserMySqlDao和UserH2Dao
UserMySqlDao.java
@Transactional
@Repository
public interface UserMysqlDao extends CrudRepository<UserMysql, Integer>{
public UserMysql findByName(String name);
}
UserH2Dao.java
@Transactional
@Repositories
public interface UserH2Dao extends CrudRepository<Userh2, Integer>{
public Userh2 findByName(String name);
}
最后，我有一个UserController作为端点来访问我的服务
UserController.java
@Controller
@RequestMapping("/user")
public class UserController {
@Autowired
private UserMysqlDao userMysqlDao;
@Autowired
private UserH2Dao userH2Dao;
@RequestMapping("/createM")
@ResponseBody
public String createUserMySql(String name){
UserMysql user = new UserMysql();
try{
user.name = name;
userMysqlDao.save(user);
return "Success creating user with Id: "+user.id;
}catch(Exception ex){
return "Error creating the user: " + ex.toString();
}
}
@RequestMapping("/createH")
@ResponseBody
public String createUserH2(String name){
Userh2 user = new Userh2();
try{
user.name = name;
userH2Dao.save(user);
return "Success creating user with Id: "+user.id;
}catch(Exception ex){
return "Error creating the user: " + ex.toString();
}
}
}
Application.java
@Configuration
@EnableAutoConfiguration(exclude={DataSourceAutoConfiguration.class})
@EntityScan(basePackages="com.test.entity.db")
@ComponentScan
public class Application {
public static void main(String[] args) {
System.out.println("Entering spring boot");
ApplicationContext ctx = SpringApplication.run(Application.class, args);
System.out.println("Let's inspect the beans provided by Spring Boot:");
String[] beanNames = ctx.getBeanDefinitionNames();
Arrays.sort(beanNames);
for (String beanName : beanNames) {
System.out.print(beanName);
System.out.print(" ");
}
System.out.println("");
}
}
使用这种配置，我的Spring启动运行良好，但是当我访问
时http://localhost/user/createM?name=myname it writes an exception
Error creating the user: org.springframework.dao.InvalidDataAccessResourceUsageException: could not execute statement; SQL [n/a]; nested exception is org.hibernate.exception.SQLGrammarException: could not execute statement
我在谷歌上搜索，还没有解决方案。有什么想法发生这种异常？这是实现多个数据源以实现上述情况的最佳方法吗？如果需要的话，我会接受完整的重构。
由于
答案 0 :(得分：48)
我认为你会发现它很有用
http://docs.spring.io/spring-boot/docs/current/reference/htmlsingle/#howto-two-datasources
它展示了如何定义多个数据源＆amp;将其中一个指定为主要。
这是一个相当完整的示例，还包含分发事务 - 如果您需要它。
您需要创建2个配置类，分离模型/存储库包等以使配置变得容易。
此外，在上面的示例中，它手动创建数据源。您可以使用带有@ConfigurationProperties批注的spring doc方法来避免这种情况。这是一个例子：
http://xantorohara.blogspot.com.tr/2013/11/spring-boot-jdbc-with-multiple.html
希望这些有所帮助。
答案 1 :(得分：7)
几天前我遇到同样的问题，我按照下面提到的链接，我能够克服这个问题
答案 2 :(得分：4)
我用这种方式解决了问题（如何使用spring和Hibernate连接多个数据库），希望它会有所帮助：）
注意：我已添加相关代码，请在我在下面提到的代码中使用的impl的帮助下制作dao。
<强>的web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
id="WebApp_ID" version="3.0">
<display-name>MultipleDatabaseConnectivityInSpring</display-name>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
<servlet>
<servlet-name>dispatcher</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>
/WEB-INF/dispatcher-servlet.xml
</param-value>
</context-param>
<servlet-mapping>
<servlet-name>dispatcher</servlet-name>
<url-pattern>*.htm</url-pattern>
</servlet-mapping>
<session-config>
<session-timeout>30</session-timeout>
</session-config>
</web-app>
<强>的persistence.xml
<?xml version="1.0" encoding="UTF-8"?>
<persistence version="1.0"
xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd">
<persistence-unit name="localPersistenceUnitOne"
transaction-type="RESOURCE_LOCAL">
<provider>org.hibernate.ejb.HibernatePersistence</provider>
<class>in.india.entities.CustomerDetails</class>
<exclude-unlisted-classes />
<properties>
<property name="hibernate.dialect" value="org.hibernate.dialect.PostgreSQLDialect" />
<property name="hibernate.connection.driver_class" value="org.postgresql.Driver" />
<property name="hibernate.jdbc.batch_size" value="0" />
<property name="hibernate.show_sql" value="false" />
<property name="hibernate.connection.url" value="jdbc:postgresql://localhost:5432/shankar?sslmode=require" />
<property name="hibernate.connection.username" value="username" />
<property name="hibernate.connection.password" value="password" />
<property name="hibernate.hbm2ddl.auto" value="update" />
</properties>
</persistence-unit>
<persistence-unit name="localPersistenceUnitTwo"
transaction-type="RESOURCE_LOCAL">
<provider>org.hibernate.ejb.HibernatePersistence</provider>
<class>in.india.entities.CompanyDetails</class>
<exclude-unlisted-classes />
<properties>
<property name="hibernate.dialect" value="org.hibernate.dialect.PostgreSQLDialect" />
<property name="hibernate.connection.driver_class" value="org.postgresql.Driver" />
<property name="hibernate.jdbc.batch_size" value="0" />
<property name="hibernate.show_sql" value="false" />
<property name="hibernate.connection.url" value="jdbc:postgresql://localhost:5432/shankarTwo?sslmode=require" />
<property name="hibernate.connection.username" value="username" />
<property name="hibernate.connection.password" value="password" />
<property name="hibernate.hbm2ddl.auto" value="update" />
</properties>
</persistence-unit>
</persistence>
<强>调度员的servlet
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:task="http://www.springframework.org/schema/task" xmlns:p="http://www.springframework.org/schema/p"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:aop="http://www.springframework.org/schema/aop" xmlns:util="http://www.springframework.org/schema/util"
default-autowire="byName"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-3.0.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">
<!-- Configure messageSource -->
<mvc:annotation-driven />
<context:component-scan base-package="in.india.*" />
<bean id="messageResource"
class="org.springframework.context.support.ResourceBundleMessageSource"
autowire="byName">
<property name="basename" value="messageResource"></property>
</bean>
<bean
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix">
<value>/WEB-INF/jsp/</value>
</property>
<property name="suffix">
<value>.jsp</value>
</property>
</bean>
<bean id="entityManagerFactoryOne"
class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean"
autowire="constructor">
<property name="persistenceUnitName" value="localPersistenceUnitOne" />
</bean>
<bean id="messageSource"
class="org.springframework.context.support.ResourceBundleMessageSource"
autowire="byName">
<property name="basename" value="messageResource" />
</bean>
<bean id="entityManagerFactoryTwo"
class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean"
autowire="constructor">
<property name="persistenceUnitName" value="localPersistenceUnitTwo" />
</bean>
<bean id="manager1" class="org.springframework.orm.jpa.JpaTransactionManager">
<property name="entityManagerFactory" ref="entityManagerFactoryOne" />
</bean>
<bean id="manager2" class="org.springframework.orm.jpa.JpaTransactionManager">
<property name="entityManagerFactory" ref="entityManagerFactoryTwo" />
</bean>
<tx:annotation-driven transaction-manager="manager1" />
<tx:annotation-driven transaction-manager="manager2" />
<!-- declare dependies here -->
<bean class="in.india.service.dao.impl.CustomerServiceImpl" />
<bean class="in.india.service.dao.impl.CompanyServiceImpl" />
<!-- Configure MVC annotations -->
<bean
class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping" />
<bean
class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter" />
<bean
class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter" />
</beans>
将java类保存到一个数据库中
package in.india.service.dao.impl;
import in.india.entities.CompanyDetails;
import in.india.service.CompanyService;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import org.springframework.transaction.annotation.Transactional;
public class CompanyServiceImpl implements CompanyService {
@PersistenceContext(unitName = "entityManagerFactoryTwo")
EntityManager entityManager;
@Transactional("manager2")
@Override
public boolean companyService(CompanyDetails companyDetails) {
boolean flag = false;
try
{
entityManager.persist(companyDetails);
flag = true;
}
catch (Exception e)
{
flag = false;
}
return flag;
}
}
java类要在另一个数据库中持久化
package in.india.service.dao.impl;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import org.springframework.transaction.annotation.Transactional;
import in.india.entities.CustomerDetails;
import in.india.service.CustomerService;
public class CustomerServiceImpl implements CustomerService {
@PersistenceContext(unitName = "localPersistenceUnitOne")
EntityManager entityManager;
@Override
@Transactional(value = "manager1")
public boolean customerService(CustomerDetails companyData) {
boolean flag = false;
entityManager.persist(companyData);
return flag;
}
}
<强> customer.jsp
<%@page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%@taglib uri="http://www.springframework.org/tags/form" prefix="form"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<center>
<h1>SpringWithMultipleDatabase's</h1>
</center>
<form:form method="GET" action="addCustomer.htm" modelAttribute="customerBean" >
<table>
<tr>
<td><form:label path="firstName">First Name</form:label></td>
<td><form:input path="firstName" /></td>
</tr>
<tr>
<td><form:label path="lastName">Last Name</form:label></td>
<td><form:input path="lastName" /></td>
</tr>
<tr>
<td><form:label path="emailId">Email Id</form:label></td>
<td><form:input path="emailId" /></td>
</tr>
<tr>
<td><form:label path="profession">Profession</form:label></td>
<td><form:input path="profession" /></td>
</tr>
<tr>
<td><form:label path="address">Address</form:label></td>
<td><form:input path="address" /></td>
</tr>
<tr>
<td><form:label path="age">Age</form:label></td>
<td><form:input path="age" /></td>
</tr>
<tr>
<td><input type="submit" value="Submit"/></td>
</tr>
</table>
</form:form>
</body>
</html>
<强> company.jsp
<%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%>
<%@taglib uri="http://www.springframework.org/tags/form" prefix="form"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>ScheduleJobs</title>
</head>
<body>
<center><h1>SpringWithMultipleDatabase's</h1></center>
<form:form method="GET" action="addCompany.htm" modelAttribute="companyBean" >
<table>
<tr>
<td><form:label path="companyName">Company Name</form:label></td>
<td><form:input path="companyName" /></td>
</tr>
<tr>
<td><form:label path="companyStrength">Company Strength</form:label></td>
<td><form:input path="companyStrength" /></td>
</tr>
<tr>
<td><form:label path="companyLocation">Company Location</form:label></td>
<td><form:input path="companyLocation" /></td>
</tr>
<tr>
<td>
<input type="submit" value="Submit"/>
</td>
</tr>
</table>
</form:form>
</body>
</html>
<强>的index.jsp
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Home</title>
</head>
<body>
<center><h1>Multiple Database Connectivity In Spring sdfsdsd</h1></center>
<a href='customerRequest.htm'>Click here to go on Customer page</a>
<br>
<a href='companyRequest.htm'>Click here to go on Company page</a>
</body>
</html>
<强>的success.jsp
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>ScheduleJobs</title>
</head>
<body>
<center><h1>SpringWithMultipleDatabase</h1></center>
<b>Successfully Saved</b>
</body>
</html>
<强> CompanyController
package in.india.controller;
import in.india.bean.CompanyBean;
import in.india.entities.CompanyDetails;
import in.india.service.CompanyService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.servlet.ModelAndView;
@Controller
public class CompanyController {
@Autowired
CompanyService companyService;
@RequestMapping(value = "/companyRequest.htm", method = RequestMethod.GET)
public ModelAndView addStudent(ModelMap model) {
CompanyBean companyBean = new CompanyBean();
model.addAttribute(companyBean);
return new ModelAndView("company");
}
@RequestMapping(value = "/addCompany.htm", method = RequestMethod.GET)
public ModelAndView companyController(@ModelAttribute("companyBean") CompanyBean companyBean, Model model) {
CompanyDetails companyDetails = new CompanyDetails();
companyDetails.setCompanyLocation(companyBean.getCompanyLocation());
companyDetails.setCompanyName(companyBean.getCompanyName());
companyDetails.setCompanyStrength(companyBean.getCompanyStrength());
companyService.companyService(companyDetails);
return new ModelAndView("success");
}
}
<强> CustomerController
package in.india.controller;
import in.india.bean.CustomerBean;
import in.india.entities.CustomerDetails;
import in.india.service.CustomerService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.servlet.ModelAndView;
@Controller
public class CustomerController {
@Autowired
CustomerService customerService;
@RequestMapping(value = "/customerRequest.htm", method = RequestMethod.GET)
public ModelAndView addStudent(ModelMap model) {
CustomerBean customerBean = new CustomerBean();
model.addAttribute(customerBean);
return new ModelAndView("customer");
}
@RequestMapping(value = "/addCustomer.htm", method = RequestMethod.GET)
public ModelAndView customerController(@ModelAttribute("customerBean") CustomerBean customer, Model model) {
CustomerDetails customerDetails = new CustomerDetails();
customerDetails.setAddress(customer.getAddress());
customerDetails.setAge(customer.getAge());
customerDetails.setEmailId(customer.getEmailId());
customerDetails.setFirstName(customer.getFirstName());
customerDetails.setLastName(customer.getLastName());
customerDetails.setProfession(customer.getProfession());
customerService.customerService(customerDetails);
return new ModelAndView("success");
}
}
公司详细信息实体
package in.india.entities;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.SequenceGenerator;
import javax.persistence.Table;
@Entity
@Table(name = "company_details")
public class CompanyDetails {
@Id
@SequenceGenerator(name = "company_details_seq", sequenceName = "company_details_seq", initialValue = 1, allocationSize = 1)
@GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "company_details_seq")
@Column(name = "company_details_id")
private Long companyDetailsId;
@Column(name = "company_name")
private String companyName;
@Column(name = "company_strength")
private Long companyStrength;
@Column(name = "company_location")
private String companyLocation;
public Long getCompanyDetailsId() {
return companyDetailsId;
}
public void setCompanyDetailsId(Long companyDetailsId) {
this.companyDetailsId = companyDetailsId;
}
public String getCompanyName() {
return companyName;
}
public void setCompanyName(String companyName) {
this.companyName = companyName;
}
public Long getCompanyStrength() {
return companyStrength;
}
public void setCompanyStrength(Long companyStrength) {
this.companyStrength = companyStrength;
}
public String getCompanyLocation() {
return companyLocation;
}
public void setCompanyLocation(String companyLocation) {
this.companyLocation = companyLocation;
}
}
CustomerDetails实体
package in.india.entities;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.SequenceGenerator;
import javax.persistence.Table;
@Entity
@Table(name = "customer_details")
public class CustomerDetails {
@Id
@SequenceGenerator(name = "customer_details_seq", sequenceName = "customer_details_seq", initialValue = 1, allocationSize = 1)
@GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "customer_details_seq")
@Column(name = "customer_details_id")
private Long customerDetailsId;
@Column(name = "first_name ")
private String firstName;
@Column(name = "last_name ")
private String lastName;
@Column(name = "email_id")
private String emailId;
@Column(name = "profession")
private String profession;
@Column(name = "address")
private String address;
@Column(name = "age")
private int age;
public Long getCustomerDetailsId() {
return customerDetailsId;
}
public void setCustomerDetailsId(Long customerDetailsId) {
this.customerDetailsId = customerDetailsId;
}
public String getFirstName() {
return firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
public String getEmailId() {
return emailId;
}
public void setEmailId(String emailId) {
this.emailId = emailId;
}
public String getProfession() {
return profession;
}
public void setProfession(String profession) {
this.profession = profession;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
}
答案 3 :(得分：0)
使用多个数据源或实现阅读和分离写作。
您必须具备支持动态数据源选择的类AbstractRoutingDataSource的知识。
这是我的datasource.yaml，我想弄清楚如何解决此案例。您可以参考此项目spring-boot + quartz。希望这会对你有所帮助。
dbServer:
default: localhost:3306
read: localhost:3306
write: localhost:3306
datasource:
default:
type: com.zaxxer.hikari.HikariDataSource
pool-name: default
continue-on-error: false
jdbc-url: jdbc:mysql://${dbServer.default}/schedule_job?useSSL=true&verifyServerCertificate=false&useUnicode=true&characterEncoding=utf8
username: root
password: lh1234
connection-timeout: 30000
connection-test-query: SELECT 1
maximum-pool-size: 5
minimum-idle: 2
idle-timeout: 600000
destroy-method: shutdown
auto-commit: false
read:
type: com.zaxxer.hikari.HikariDataSource
pool-name: read
continue-on-error: false
jdbc-url: jdbc:mysql://${dbServer.read}/schedule_job?useSSL=true&verifyServerCertificate=false&useUnicode=true&characterEncoding=utf8
username: root
password: lh1234
connection-timeout: 30000
connection-test-query: SELECT 1
maximum-pool-size: 5
minimum-idle: 2
idle-timeout: 600000
destroy-method: shutdown
auto-commit: false
write:
type: com.zaxxer.hikari.HikariDataSource
pool-name: write
continue-on-error: false
jdbc-url: jdbc:mysql://${dbServer.write}/schedule_job?useSSL=true&verifyServerCertificate=false&useUnicode=true&characterEncoding=utf8
username: root
password: lh1234
connection-timeout: 30000
connection-test-query: SELECT 1
maximum-pool-size: 5
minimum-idle: 2
idle-timeout: 600000
destroy-method: shutdown
auto-commit: false
答案 4 :(得分：0)
使用两个数据源，您需要自己的事务管理器。
@Configuration
public class MySqlDBConfig {
@Bean
@Primary
@ConfigurationProperties(prefix="datasource.test.mysql")
public DataSource mysqlDataSource(){
return DataSourceBuilder
.create()
.build();
}
@Bean("mysqlTx")
public DataSourceTransactionManager mysqlTx() {
return new DataSourceTransactionManager(mysqlDataSource());
}
// same for another DS
}
然后在@Transaction
中相应地使用它@Transactional("mysqlTx")
@Repository
public interface UserMysqlDao extends CrudRepository<UserMysql, Integer>{
public UserMysql findByName(String name);
}
答案 5 :(得分：0)
感谢所有人的帮助，但看起来并不复杂; 几乎所有内容都由SpringBoot内部处理。
在我的情况下我想使用Mysql和Mongodb ，解决方案是对我的应用程序类使用EnableMongoRepositories和EnableJpaRepositories注释。
@SpringBootApplication
@EnableTransactionManagement
@EnableMongoRepositories(includeFilters = @ComponentScan.Filter(type = FilterType.ASSIGNABLE_TYPE, value = MongoRepository))
@EnableJpaRepositories(excludeFilters = @ComponentScan.Filter(type = FilterType.ASSIGNABLE_TYPE, value = MongoRepository))
class TestApplication { ...
NB：所有mysql实体都必须扩展JpaRepository，而mongo enities必须扩展MongoRepository。
数据源配置是直接的，如春季文档所示：
//mysql db config
spring.datasource.url= jdbc:mysql://localhost:3306/tangio
spring.datasource.username=test
spring.datasource.password=test
#mongodb config
spring.data.mongodb.host=localhost
spring.data.mongodb.port=27017
spring.data.mongodb.database=tangio
spring.data.mongodb.username=tangio
spring.data.mongodb.password=tangio
spring.data.mongodb.repositories.enabled=true
答案 6 :(得分：0)
一旦你开始使用jpa并且某个驱动程序在你的类路径中，就立即将spring引导到你的数据源（例如h2） 因此，为了使用defult数据源，你只需要定义
spring.datasource.url= jdbc:mysql://localhost:3306/
spring.datasource.username=test
spring.datasource.password=test
如果我们更进一步，你想要使用两个 我建议使用两个数据源，如下所述： Spring Boot Configure and Use Two DataSources
答案 7 :(得分：0)
使用Spring Boot 1.5.8.RELEASE
更新2018-01-07如果您想知道如何配置它，如何使用它，以及如何控制事务。我可能有你的答案。
您可以在https://www.surasint.com/spring-boot-with-multiple-databases-example/
中查看可运行的示例和一些说明我在这里复制了一些代码。
首先，您必须像这样设置application.properties
#Database
database1.datasource.url=jdbc:mysql://localhost/testdb
database1.datasource.username=root
database1.datasource.password=root
database1.datasource.driver-class-name=com.mysql.jdbc.Driver
database2.datasource.url=jdbc:mysql://localhost/testdb2
database2.datasource.username=root
database2.datasource.password=root
database2.datasource.driver-class-name=com.mysql.jdbc.Driver
然后将它们定义为提供者（@Bean），如下所示：
@Bean(name = "datasource1")
@ConfigurationProperties("database1.datasource")
@Primary
public DataSource dataSource(){
return DataSourceBuilder.create().build();
}
@Bean(name = "datasource2")
@ConfigurationProperties("database2.datasource")
public DataSource dataSource2(){
return DataSourceBuilder.create().build();
}
请注意，我有@Bean（name =“datasource1”）和@Bean（name =“datasource2”），然后当我们需要数据源为@Qualifier（“datasource1”）和@Qualifier（“datasource2”时可以使用它“），例如
@Qualifier("datasource1")
@Autowired
private DataSource dataSource;
如果您关心事务，则必须为它们定义DataSourceTransactionManager，如下所示：
@Bean(name="tm1")
@Autowired
@Primary
DataSourceTransactionManager tm1(@Qualifier ("datasource1") DataSource datasource) {
DataSourceTransactionManager txm = new DataSourceTransactionManager(datasource);
return txm;
}
@Bean(name="tm2")
@Autowired
DataSourceTransactionManager tm2(@Qualifier ("datasource2") DataSource datasource) {
DataSourceTransactionManager txm = new DataSourceTransactionManager(datasource);
return txm;
}
然后你可以像
一样使用它@Transactional //this will use the first datasource because it is @primary
或
@Transactional("tm2")
这应该足够了。请参阅上面链接中的示例和详细信息。
答案 8 :(得分：0)
MySqlBDConfig.java
@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(basePackages = "PACKAGE OF YOUR CRUDS USING MYSQL DATABASE",entityManagerFactoryRef = "mysqlEmFactory" ,transactionManagerRef = "mysqlTransactionManager")
public class MySqlBDConfig{
@Autowired
private Environment env;
@Bean(name="mysqlProperities")
@ConfigurationProperties(prefix="spring.mysql")
public DataSourceProperties mysqlProperities(){
return new DataSourceProperties();
}
@Bean(name="mysqlDataSource")
public DataSource interfaceDS(@Qualifier("mysqlProperities")DataSourceProperties dataSourceProperties){
return dataSourceProperties.initializeDataSourceBuilder().build();
}
@Primary
@Bean(name="mysqlEmFactory")
public LocalContainerEntityManagerFactoryBean mysqlEmFactory(@Qualifier("mysqlDataSource")DataSource mysqlDataSource,EntityManagerFactoryBuilder builder){
return builder.dataSource(mysqlDataSource).packages("PACKAGE OF YOUR MODELS").build();
}
@Bean(name="mysqlTransactionManager")
public PlatformTransactionManager mysqlTransactionManager(@Qualifier("mysqlEmFactory")EntityManagerFactory factory){
return new JpaTransactionManager(factory);
}
}
H2DBConfig.java
@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(basePackages = "PACKAGE OF YOUR CRUDS USING MYSQL DATABASE",entityManagerFactoryRef = "dsEmFactory" ,transactionManagerRef = "dsTransactionManager")
public class H2DBConfig{
@Autowired
private Environment env;
@Bean(name="dsProperities")
@ConfigurationProperties(prefix="spring.h2")
public DataSourceProperties dsProperities(){
return new DataSourceProperties();
}
@Bean(name="dsDataSource")
public DataSource dsDataSource(@Qualifier("dsProperities")DataSourceProperties dataSourceProperties){
return dataSourceProperties.initializeDataSourceBuilder().build();
}
@Bean(name="dsEmFactory")
public LocalContainerEntityManagerFactoryBean dsEmFactory(@Qualifier("dsDataSource")DataSource dsDataSource,EntityManagerFactoryBuilder builder){
LocalContainerEntityManagerFactoryBean em = builder.dataSource(dsDataSource).packages("PACKAGE OF YOUR MODELS").build();
HibernateJpaVendorAdapter ven = new HibernateJpaVendorAdapter();
em.setJpaVendorAdapter(ven);
HashMap<String, Object> prop = new HashMap<>();
prop.put("hibernate.dialect", env.getProperty("spring.jpa.properties.hibernate.dialect"));
prop.put("hibernate.show_sql", env.getProperty("spring.jpa.show-sql"));
em.setJpaPropertyMap(prop);
em.afterPropertiesSet();
return em;
}
@Bean(name="dsTransactionManager")
public PlatformTransactionManager dsTransactionManager(@Qualifier("dsEmFactory")EntityManagerFactory factory){
return new JpaTransactionManager(factory);
}
}
application.properties
#---mysql DATASOURCE---
spring.mysql.driverClassName = com.mysql.jdbc.Driver
spring.mysql.url = jdbc:mysql://127.0.0.1:3306/test
spring.mysql.username = root
spring.mysql.password = root
#----------------------
#---H2 DATASOURCE----
spring.h2.driverClassName = org.h2.Driver
spring.h2.url = jdbc:h2:file:~/test
spring.h2.username = root
spring.h2.password = root
#---------------------------
#------JPA-----
spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.H2Dialect
spring.jpa.show-sql=true
spring.jpa.properties.hibernate.temp.use_jdbc_metadata_defaults = false
spring.jpa.hibernate.ddl-auto = update
spring.jpa.properties.hibernate.enable_lazy_load_no_trans=true
Application.java
@SpringBootApplication
public class Application {
public static void main(String[] args) {
ApplicationContext ac=SpringApplication.run(KeopsSageInvoiceApplication.class, args);
UserMysqlDao userRepository = ac.getBean(UserMysqlDao.class)
//for exemple save a new user using your repository
userRepository.save(new UserMysql());
}
}