目录一、建库建表1.1 创建数据库db1和数据库db21.2 在数据库db1中创建表db11.3 在数据库db2中创建表db2二、创建springboot项目2.1 pom.xml导入依赖2.2 创建application.yml文件(与 2.3 二选一进行配置,推荐此方法)2.3 创建application.properties文件(与 2.2 二选一进行配置)2.4 创建mapper文件2.5 创建config配置文件三、测试代码运行3.1 测试类中测试代码3.2 运行结果
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 */@Mapperpublic 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 */@Mapperpublic interface Db2Mapper { @Insert("insert into db2(name,age) values('fi',81)") int add();}
2.5 创建config配置文件
我个人是放在config包下，文件随便命名的
import org.apache.ibatis.session.SqlSessionFactory;import org.mybatis.spring.SqlSessionFactoryBean;import org.mybatis.spring.SqlSessionTemplate;import org.mybatis.spring.annotation.MapperScan;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.core.io.support.PathMatchingResourcePatternResolver;import javax.sql.DataSource;/** * @Author if * @Description: 注意以下有些文件路径需要更改 * @Date 2021-05-20 下午 09:56 */@Configuration@MapperScan(basePackages = "com.ifyyf.study.mapper.db1", sqlSessionFactoryRef = "db1SqlSessionFactory")public class Db1DataSourceConfig { @Bean("db1DataSource") @ConfigurationProperties(prefix = "spring.datasource.db1") //读取application.yml中的配置参数映射成为一个对象 public DataSource getDb1DataSource(){ return DataSourceBuilder.create().build(); } @Bean("db1SqlSessionFactory") public SqlSessionFactory db1SqlSessionFactory(@Qualifier("db1DataSource") DataSource dataSource) throws Exception { SqlSessionFactoryBean bean = new SqlSessionFactoryBean(); bean.setDataSource(dataSource); // mapper的xml形式文件位置必须要配置，不然将报错：no statement （这种错误也可能是mapper的xml中，namespace与项目的路径不一致导致） bean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath*:mapping/db1/*.xml")); return bean.getObject(); } @Bean("db1SqlSessionTemplate") public SqlSessionTemplate db1SqlSessionTemplate(@Qualifier("db1SqlSessionFactory") SqlSessionFactory sqlSessionFactory){ return new SqlSessionTemplate(sqlSessionFactory); }}
import org.apache.ibatis.session.SqlSessionFactory;import org.mybatis.spring.SqlSessionFactoryBean;import org.mybatis.spring.SqlSessionTemplate;import org.mybatis.spring.annotation.MapperScan;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.core.io.support.PathMatchingResourcePatternResolver;import javax.sql.DataSource;/** * @Author if * @Description: 注意以下有些文件路径需要更改 * @Date 2021-05-20 下午 09:56 */@Configuration@MapperScan(basePackages = "com.ifyyf.study.mapper.db2", sqlSessionFactoryRef = "db2SqlSessionFactory")public class Db2DataSourceConfig { @Bean("db2DataSource") @ConfigurationProperties(prefix = "spring.datasource.db2") //读取application.yml中的配置参数映射成为一个对象 public DataSource getDb2DataSource(){ return DataSourceBuilder.create().build(); } @Bean("db2SqlSessionFactory") public SqlSessionFactory db2SqlSessionFactory(@Qualifier("db2DataSource") DataSource dataSource) throws Exception { SqlSessionFactoryBean bean = new SqlSessionFactoryBean(); bean.setDataSource(dataSource); // mapper的xml形式文件位置必须要配置，不然将报错：no statement （这种错误也可能是mapper的xml中，namespace与项目的路径不一致导致） bean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath*:mapping/db2/*.xml")); return bean.getObject(); } @Bean("db2SqlSessionTemplate") public SqlSessionTemplate db2SqlSessionTemplate(@Qualifier("db2SqlSessionFactory") SqlSessionFactory sqlSessionFactory){ return new SqlSessionTemplate(sqlSessionFactory); }}
三、测试代码运行
3.1 测试类中测试代码
springboot项目中测试类进行测试
import com.ifyyf.study.mapper.db1.Db1Mapper;import com.ifyyf.study.mapper.db2.Db2Mapper;import org.junit.jupiter.api.Test;import org.springframework.boot.test.context.SpringBootTest;import javax.annotation.Resource;@SpringBootTestclass StudyApplicationTests { @Resource private Db1Mapper db1Mapper; @Resource private Db2Mapper db2Mapper; @Test void contextLoads() { System.out.println(db1Mapper.add()); System.out.println(db2Mapper.add()); }}
3.2 运行结果
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可是，我却迈不开步伐，怎么也走不出那个圈……
