springboot+jpa使用自定义配置文件连接数据库报错：Cannot determine embedded database driver class for database type NONE

原因：没有配置数据源dataSource，配置文件加载进来了的。

解决办法：在配置类中配置数据源

package com.springboot1.util;

import org.apache.tomcat.jdbc.pool.DataSource;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.PropertySource;
import org.springframework.stereotype.Component;

@Configuration
@PropertySource(value={"classpath:jdbc.properties"})
@ConfigurationProperties(prefix="database",ignoreUnknownFields = false)
@Component
//@ConfigurationProperties(prefix="database",locations="classpath:jdbc.properties")高版本中@ConfigurationProperties去除了locations的属性  
public class PropertyConfig {
private String driverName=null;
private String url=null;
private String username=null;
private String password=null;
public String getDriverName() {
    return driverName;
}
public void setDriverName(String driverName) {
    this.driverName = driverName;
}
public String getUrl() {
    return url;
}
public void setUrl(String url) {
    this.url = url;
}
public String getUsername() {
    return username;
}
public void setUsername(String username) {
    this.username = username;
}
public String getPassword() {
    return password;
}
public void setPassword(String password) {
    this.password = password;
}
@Bean
public DataSource druidDataSource() {
    DataSource datasource = new DataSource();
    datasource.setUrl(url);
    datasource.setUsername(username);
    datasource.setPassword(password);
    datasource.setDriverClassName(driverName);
    return datasource;
}

}