5.19.1. Master / Slave 主從資料庫資料來源配置

5.19.1.1. application.properties

spring.datasource.master.driverClassName = com.mysql.cj.jdbc.Driver
spring.datasource.master.url=jdbc:mysql://192.168.1.240:3306/test?useUnicode=true&characterEncoding=UTF-8&serverTimezone=UTC&useSSL=false
spring.datasource.master.username = root
spring.datasource.master.password = password

spring.datasource.slave.driverClassName = com.mysql.cj.jdbc.Driver
spring.datasource.slave.url=jdbc:mysql://192.168.1.250:3306/test?useUnicode=true&characterEncoding=UTF-8&serverTimezone=UTC&useSSL=false
spring.datasource.slave.username = root
spring.datasource.slave.password = password

spring.jpa.database-platform=org.hibernate.dialect.MySQL5Dialect

5.19.1.2. 配置主從資料來源

package cn.netkiller.config;

import javax.sql.DataSource;

import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.autoconfigure.jdbc.DataSourceProperties;
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;

@Configuration
public class MultiDataSourceConfig {

	@Bean
	@Primary
	@ConfigurationProperties("spring.datasource.master")
	public DataSourceProperties firstDataSourceProperties() {
		return new DataSourceProperties();
	}

	@Bean("Master")
	@Primary
	@ConfigurationProperties("spring.datasource.master")
	public DataSource firstDataSource() {
		return firstDataSourceProperties().initializeDataSourceBuilder().build();
	}

	@Bean
	@ConfigurationProperties("spring.datasource.slave")
	public DataSourceProperties secondDataSourceProperties() {
		return new DataSourceProperties();
	}

	@Bean(name = "Slave")
	@ConfigurationProperties("spring.datasource.slave")
	public DataSource secondDataSource() {
		return secondDataSourceProperties().initializeDataSourceBuilder().build();
	}

	@Bean("masterJdbcTemplate")
	@Primary
	public JdbcTemplate primaryJdbcTemplate(@Qualifier("Master") DataSource Master) {
		return new JdbcTemplate(Master);
	}

	@Bean("slaveJdbcTemplate")
	public JdbcTemplate secondJdbcTemplate(@Qualifier("Slave") DataSource Master) {
		return new JdbcTemplate(Master);
	}

}

5.19.1.3. 選擇資料來源

// 預設是 Master
	@Autowired
	private JdbcTemplate jdbcTemplate;

	// 或者這樣寫
	@Qualifier("masterJdbcTemplate")
	@Autowired
	private JdbcTemplate masterJdbcTemplate;
	
	// 下面是 Slave 資料來源
	@Qualifier("slaveJdbcTemplate")
	@Autowired
	private JdbcTemplate slaveJdbcTemplate;