一、建库建表
1.1 创建数据库db1和数据库db2
1.2 在数据库db1中创建表db1
CREATE TABLE `db1` (
`id` int unsigned zerofill NOT NULL AUTO_INCREMENT,
`name` varchar(50) DEFAULT NULL,
`age` int unsigned zerofill DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8mb4;
1.3 在数据库db2中创建表db2
CREATE TABLE `db2` (
`id` int unsigned zerofill NOT NULL AUTO_INCREMENT,
`name` varchar(50) DEFAULT NULL,
`age` int unsigned zerofill DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8mb4;
二、创建springboot项目
2.1 pom.xml导入依赖
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>2.1.4</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
<exclusions>
<exclusion>
<groupId>org.junit.vintage</groupId>
<artifactId>junit-vintage-engine</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<scope>test</scope>
</dependency>
2.2 创建application.yml文件(与 2.3 二选一进行配置,推荐此方法)
server:
port: 8080 # 启动端口
spring:
datasource:
db1: # 数据源1
jdbc-url: jdbc:mysql://localhost:3306/db1?serverTimezone=Asia/Shanghai&useUnicode=true&characterEncoding=utf8
username: root
password: root
driver-class-name: com.mysql.cj.jdbc.Driver
db2: # 数据源2
jdbc-url: jdbc:mysql://localhost:3306/db2?serverTimezone=Asia/Shanghai&useUnicode=true&characterEncoding=utf8
username: root
password: root
driver-class-name: com.mysql.cj.jdbc.Driver
2.3 创建application.properties文件(与 2.2 二选一进行配置)
server.port=8080
spring.datasource.db1.url=jdbc:mysql://localhost:3306/db1?serverTimezone=Asia/Shanghai&useUnicode=true&characterEncoding=utf8
spring.datasource.db1.username=root
spring.datasource.db1.password=root
spring.datasource.db1.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.db2.url=jdbc:mysql://localhost:3306/db2?serverTimezone=Asia/Shanghai&useUnicode=true&characterEncoding=utf8
spring.datasource.db2.username=root
spring.datasource.db2.password=root
spring.datasource.db2.driver-class-name=com.mysql.jdbc.Driver
2.4 创建mapper文件
我个人是放在mapper包下，文件随便命名的
代码随便写的，测试而已
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Mapper;
/**
* @Author if
* @Description: What is it
* @Date 2021-05-20 下午 09:52
*/
@Mapper
public interface Db1Mapper {
@Insert("insert into db1(name,age) values('if',18)")
int add();
}
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Mapper;
/**
* @Author if
* @Description: What is it
* @Date 2021-05-20 下午 09:52
*/
@Mapper
public interface Db2Mapper {
@Insert("insert into db2(name,age) values('fi',81)")
int add();
}
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