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自定义数据源代码

java
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import com.zaxxer.hikari.HikariDataSource;
import org.apache.ibatis.logging.stdout.StdOutImpl;
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.Configuration;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.PropertySource;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;

import javax.sql.DataSource;

@Configuration
@MapperScan(basePackages = {"cn.tofuwine.dao"},
        sqlSessionTemplateRef = "customSqlSessionTemplate")
// 这个注解是可选的，你可以将你的数据库配置提取到单独的文件进行存储
@PropertySource("custom_datasource.properties")
public class CustomDataSourceConfiguration {

    @Bean("customDataSource")
    @ConfigurationProperties(prefix = "custom.datasource")
    public HikariDataSource customDataSource() {
        return DataSourceBuilder.create().type(HikariDataSource.class).build();
    }

    @Bean("customSqlSessionFactory")
    public SqlSessionFactory customSqlSessionFactory(@Qualifier("customDataSource") DataSource dataSource) throws Exception {
        // 若使用 Mybatis-Plus, 此处应使用 com.baomidou.mybatisplus.extension.spring.MybatisSqlSessionFactoryBean
        SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
        bean.setDataSource(dataSource);
        bean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath:mapper/**/*.xml"));
        // 若使用 Mybatis-Plus, 此处应使用 com.baomidou.mybatisplus.core.MybatisConfiguration
        org.apache.ibatis.session.Configuration configuration = new org.apache.ibatis.session.Configuration();
        configuration.setLogImpl(StdOutImpl.class);
        configuration.setMapUnderscoreToCamelCase(true);
        bean.setConfiguration(configuration);
        return bean.getObject();
    }

    @Bean("customSqlSessionTemplate")
    public SqlSessionTemplate customSqlSessionTemplate(@Qualifier("customSqlSessionFactory") SqlSessionFactory sqlSessionFactory) {
        return new SqlSessionTemplate(sqlSessionFactory);
    }
}

依赖说明

Gradle
build.gradle
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dependencies {
    implementation("org.springframework.boot:spring-boot-starter-data-jdbc")
    runtimeOnly("com.mysql:mysql-connector-j")
    
    // 以下二选一 (版本自行修改)
    // 1. MyBatis
    implementation("org.mybatis.spring.boot:mybatis-spring-boot-starter:3.0.3")
    testImplementation("org.mybatis.spring.boot:mybatis-spring-boot-starter-test:3.0.3")
    
    // 2. MyBatis-Plus
    implementation("com.baomidou:mybatis-plus-boot-starter:3.5.7")
    testImplementation("com.baomidou:mybatis-plus-boot-starter-test:3.5.7")
}