ProjectController

`package com.mybatis_study.kaoshi.config;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.jdbc.DataSourceBuilder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.jdbc.core.JdbcTemplate;

import javax.sql.DataSource;

@Configuration
public class DatabaseConfig {

@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;

@Bean
public DataSource dataSource() {
    return DataSourceBuilder.create()
            .url(url)
            .username(username)
            .password(password)
            .driverClassName(driverClassName)
            .build();
}

@Bean
public JdbcTemplate jdbcTemplate(DataSource dataSource) {
    return new JdbcTemplate(dataSource);
}

}`