1.application.properties 配置信息

spring.datasource.url=jdbc:mysql://127.0.0.1:3306/datebasename
spring.datasource.username=root
spring.datasource.password=password
spring.datasource.driver-class-name=com.mysql.jdbc.Driver

2.添加pom.xml

<dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>

        <dependency>
            <groupId>org.apache.ibatis</groupId>
            <artifactId>ibator</artifactId>
            <version>1.2.1.681</version>
        </dependency>

        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>1.3.2</version>
        </dependency>

        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.4.6</version>
        </dependency>
        <dependency>
            <groupId>com.zaxxer</groupId>
            <artifactId>HikariCP</artifactId>
            <version>3.2.0</version>
        </dependency>

3.數據庫連接

import com.zaxxer.hikari.HikariDataSource;
import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.beans.factory.annotation.Value;
 
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Primary;
import org.springframework.stereotype.Component;

import javax.sql.DataSource;

//加載com.example.demo.mapper.test目錄下的sql，並關聯到當前到數據庫
@Component
@MapperScan(value = "com.example.demo.mapper.test", sqlSessionFactoryRef = "sqlSessionFactoryTest")
 
public class TestDateSource {

    //讀取配置文件信息
    @Value("${spring.datasource.url}")
    private String url;

    @Value("${spring.datasource.username}")
    private String userName;

    @Value("${spring.datasource.password}")
    private String password;


    @Value("${spring.datasource.driver-class-name}")
    private String driverClassName;


    @Primary
    @Bean(name = "dateSourceTest")
    public DataSource dataSource() {
        return getDataSource(url, userName, password, driverClassName);
    }

    //實例化
    @Bean(name = "sqlSessionFactoryTest")
    public SqlSessionFactory sqlSessionFactory(@Qualifier("dateSourceTest") DataSource ds) throws Exception {
        SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean();

        sqlSessionFactoryBean.setDataSource(ds);
        return sqlSessionFactoryBean.getObject();
    }

    //這裏用到了HikariDataSource連接池，定義一個連接池
    private HikariDataSource getDataSource(String url, String userName, String password, String driverClassName) {
        final HikariDataSource ds = new HikariDataSource();
        ds.setJdbcUrl(url);
        ds.setUsername(userName);
        ds.setPassword(password);
        ds.setDriverClassName(driverClassName);
        return ds;
    }
    
}

4.在com.example.demo.mapper.test目錄下創建mapper接口，直接進行數據庫的數據操作

import org.apache.ibatis.annotations.*;
import org.mapstruct.Mapper;

import java.util.HashMap;
import java.util.List;

@Mapper
public interface UserMapper {

    @Select("select *from user")
    List<HashMap> getUser();

    @Select("select *from user where username=#{userName}")
    List<HashMap> getuserName(@Param("userName") String userName);

  
}

5.在service調用對應的mapper接口

@Service
public class TestService {

    @Resource
    UserMapper userMapper;

    public JSONObject getUSer() {

        JSONObject mapOfColValues = new JSONObject();

        List<HashMap> order = userMapper.getUser();
        if (CollectionUtils.isNotEmpty(order)) {
            for (int i = 0; i < order.size(); i++) {
                mapOfColValues.put("id", order.get(i).get("id"));
                mapOfColValues.put("用戶名", order.get(i).get("user_name"));
                mapOfColValues.put("昵稱", order.get(i).get("real_name"));
                mapOfColValues.put("手機號", order.get(i).get("mobile"));
                mapOfColValues.put("密碼", order.get(i).get("password"));
            }
        } else {
            mapOfColValues.put("result", "沒有數據");
        }

        return mapOfColValues;

    }
}

Springboot+mybatis+ibatis mysql鏈接