Spring Boot 2.x基础教程：JdbcTemplate的多数据源配置

Author: dyc87112

2.1.x/chapter3-7/.gitignore

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+HELP.md
+/target/
+!.mvn/wrapper/maven-wrapper.jar
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+/build/
+
+### VS Code ###
+.vscode/

2.1.x/chapter3-7/pom.xml

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+<?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>
+
+	<parent>
+		<groupId>org.springframework.boot</groupId>
+		<artifactId>spring-boot-starter-parent</artifactId>
+		<version>2.1.3.RELEASE</version>
+		<relativePath/> <!-- lookup parent from repository -->
+	</parent>
+
+	<groupId>com.didispace</groupId>
+	<artifactId>chapter3-7</artifactId>
+	<version>0.0.1-SNAPSHOT</version>
+	<description>使用JDBCTemplate的多数据源配置</description>
+
+	<properties>
+		<java.version>1.8</java.version>
+	</properties>
+
+	<dependencies>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-web</artifactId>
+		</dependency>
+
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-jdbc</artifactId>
+		</dependency>
+
+		<dependency>
+			<groupId>mysql</groupId>
+			<artifactId>mysql-connector-java</artifactId>
+		</dependency>
+
+		<dependency>
+			<groupId>org.projectlombok</groupId>
+			<artifactId>lombok</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>

2.1.x/chapter3-7/src/main/java/com/didispace/chapter37/Chapter37Application.java

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+package com.didispace.chapter37;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class Chapter37Application {
+
+    public static void main(String[] args) {
+        SpringApplication.run(Chapter37Application.class, args);
+    }
+
+}

2.1.x/chapter3-7/src/main/java/com/didispace/chapter37/DataSourceConfiguration.java

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+package com.didispace.chapter37;
+
+import org.springframework.beans.factory.annotation.Qualifier;
+import org.springframework.boot.context.properties.ConfigurationProperties;
+import org.springframework.boot.jdbc.DataSourceBuilder;
+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 DataSourceConfiguration {
+
+    @Primary
+    @Bean
+    @ConfigurationProperties(prefix = "spring.datasource.primary")
+    public DataSource primaryDataSource() {
+        return DataSourceBuilder.create().build();
+    }
+
+    @Bean
+    @ConfigurationProperties(prefix = "spring.datasource.secondary")
+    public DataSource secondaryDataSource() {
+        return DataSourceBuilder.create().build();
+    }
+
+    @Bean
+    public JdbcTemplate primaryJdbcTemplate(@Qualifier("primaryDataSource") DataSource primaryDataSource) {
+        return new JdbcTemplate(primaryDataSource);
+    }
+
+    @Bean
+    public JdbcTemplate secondaryJdbcTemplate(@Qualifier("secondaryDataSource") DataSource secondaryDataSource) {
+        return new JdbcTemplate(secondaryDataSource);
+    }
+
+}

2.1.x/chapter3-7/src/main/resources/application.properties

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+# pring boot 1.x的配置：spring.datasource.primary.url=jdbc:mysql://localhost:3306/test1
+spring.datasource.primary.jdbc-url=jdbc:mysql://localhost:3306/test1
+spring.datasource.primary.username=root
+spring.datasource.primary.password=123456
+spring.datasource.primary.driver-class-name=com.mysql.cj.jdbc.Driver
+
+# spring boot 1.x的配置：spring.datasource.secondary.url=jdbc:mysql://localhost:3306/test2
+spring.datasource.secondary.jdbc-url=jdbc:mysql://localhost:3306/test2
+spring.datasource.secondary.username=root
+spring.datasource.secondary.password=123456
+spring.datasource.secondary.driver-class-name=com.mysql.cj.jdbc.Driver

2.1.x/chapter3-7/src/test/java/com/didispace/chapter37/Chapter37ApplicationTests.java

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+package com.didispace.chapter37;
+
+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.jdbc.core.JdbcTemplate;
+import org.springframework.test.context.junit4.SpringRunner;
+
+
+@RunWith(SpringRunner.class)
+@SpringBootTest
+public class Chapter37ApplicationTests {
+
+    @Autowired
+    @Qualifier("primaryJdbcTemplate")
+    protected JdbcTemplate jdbcTemplate1;
+
+    @Autowired
+    @Qualifier("secondaryJdbcTemplate")
+    protected JdbcTemplate jdbcTemplate2;
+
+    @Before
+    public void setUp() {
+        jdbcTemplate1.update("DELETE  FROM  USER ");
+        jdbcTemplate2.update("DELETE  FROM  USER ");
+    }
+
+    @Test
+    public void test() throws Exception {
+        // 往第一个数据源中插入 2 条数据
+        jdbcTemplate1.update("insert into user(name,age) values(?, ?)", "aaa", 20);
+        jdbcTemplate1.update("insert into user(name,age) values(?, ?)", "bbb", 30);
+
+        // 往第二个数据源中插入 1 条数据，若插入的是第一个数据源，则会主键冲突报错
+        jdbcTemplate2.update("insert into user(name,age) values(?, ?)", "ccc", 20);
+
+        // 查一下第一个数据源中是否有 2 条数据，验证插入是否成功
+        Assert.assertEquals("2", jdbcTemplate1.queryForObject("select count(1) from user", String.class));
+
+        // 查一下第一个数据源中是否有 1 条数据，验证插入是否成功
+        Assert.assertEquals("1", jdbcTemplate2.queryForObject("select count(1) from user", String.class));
+    }
+
+}