JdbcTemplate 配置多数据源(完全照抄,完整)

Posted 2020-10-13 无敌战魔i

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>

	<groupId>top.zekk</groupId>
	<artifactId>two-datasource</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>jar</packaging>

	<name>two-datasource</name>
	<description>Demo project for Spring Boot</description>

	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>1.5.8.RELEASE</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>

	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
		<java.version>1.8</java.version>
	</properties>

	<dependencies>
		<!--<dependency>-->
			<!--<groupId>org.springframework.boot</groupId>-->
			<!--<artifactId>spring-boot-starter-data-jpa</artifactId>-->
		<!--</dependency>-->
		<dependency>
			<groupId>org.projectlombok</groupId>
			<artifactId>lombok</artifactId>
		</dependency>
		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-jdbc</artifactId>
		</dependency>

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
	</dependencies>

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


</project>

　　

package top.zekk.twodatasource.config;


import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.autoconfigure.jdbc.DataSourceBuilder;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.jdbc.core.JdbcTemplate;

import javax.sql.DataSource;


@Configuration
public class DataSourceConfig {

    @Bean(name = "primaryDataSource")

//    @Qualifier("primaryDataSource")//原博主这里加上@Qualify 没有必要 删了也没有影响
    @ConfigurationProperties("spring.datasource.primary")
    public DataSource primaryDataSource() {
        return DataSourceBuilder.create().build();
    }

    @Primary
    @Bean(name = "secondaryDataSource")

//    @Qualifier("secondaryDataSource") //原博主这里加上@Qualify 没有必要 删了也没有影响
    @ConfigurationProperties("spring.datasource.secondary")
    public DataSource secondaryDataSource() {
        return DataSourceBuilder.create().build();
    }


    /**
     * @param dataSource
     * @return
     * @Bean明确地指示了一种方法，什么方法呢——产生一个bean的方法， 并且交给Spring容器管理；从这我们就明白了为啥@Bean是放在方法的注释上了，
     * 因为它很明确地告诉被注释的方法，你给我产生一个Bean，然后交给Spring容器，
     * 实现依赖注入
     */
    @Bean(name = "primaryJdbcTemplate")
    public JdbcTemplate primaryTemplate(@Qualifier("primaryDataSource") DataSource dataSource) {
        return new JdbcTemplate(dataSource);
    }

    @Bean(name = "secondaryJdbcTemplate")
    public JdbcTemplate secondaryTemplate(@Qualifier("secondaryDataSource") DataSource dataSource) {
        return new JdbcTemplate(dataSource);
    }


}

　　

测试 通过测试主键判断数据源是否配置成功

package top.zekk.twodatasource;

import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.context.annotation.Bean;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.test.context.junit4.SpringRunner;

@RunWith(SpringRunner.class)
@SpringBootTest
public class TwoDatasourceApplicationTests {

	@Autowired
	/*@Qualify 多个同类型bean?存在时  Spring不知道应该绑定哪个实现类
	指定绑定的类名@Bean(name="**")
	*/
	@Qualifier("primaryJdbcTemplate")
	protected JdbcTemplate jdbcTemplate1;

	@Autowired
	//@Qualify 多个同类型bean?存在时 指定绑定的类名@Bean(name="**")
	@Qualifier("secondaryJdbcTemplate")
	protected JdbcTemplate jdbcTemplate2;

	@Before //首先执行清空数据库操作
	public void setUp(){
		jdbcTemplate1.update("DELETE FROM USER ");
		jdbcTemplate2.update("DELETE FROM USER ");
	}

	@Test
	public void test(){
		jdbcTemplate1.update
				("INSERT INTO USER (id,name,age) VALUES (?,?,?)",1,"aaa",20);
		jdbcTemplate2.update
				("INSERT INTO USER (id,name,age) VALUES (?,?,?)",1,"bbb",30);
		jdbcTemplate2.update
				("INSERT INTO USER (id,name,age) VALUES (?,?,?)",2,"bbb",31);

		Assert.assertEquals("1",jdbcTemplate1.queryForObject("select count(1) from user",String.class));

		Assert.assertEquals("2",jdbcTemplate2.queryForObject("select count(1) from user",String.class));
	}

}

　　数据库 

DROP TABLE IF EXISTS `user`;
CREATE TABLE `user` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(255) DEFAULT NULL,
  `age` int(11) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;