【记录】emoji表情通过java保存到数据库（SpringBoot+Druid+Mybatis）

场景：使用微信授权获取用户信息-昵称，头像地址等，保存用户昵称（带emoji表情，如☺）存储到数据库失败

Caused by: java.sql.SQLException: Incorrect string value: '\xF0\x9F\x98\xAF' for column 'nickname' at row 1

如 之前的一篇 文章（当爬虫遇到emoji表情） 所说：需要修改数据库中库、表编码格式为 utf-8mb4

但目前我们就遭遇到了：数据库没权限！的情况，因为并不是每次都是在自己服务器上开发，所以只能通过SQL来设置：

尝试一下以下SQL

set names utf8mb4;
update user set nickname='☺' where id = 1

那么当使用Java（SpringBoot+Druid连接池+Mybatis）进行表情符号插入时也是

首先测试下使用以上SQL是否能够成功插入

1.配置application.properties中

spring.datasource.url=jdbc:mysql://localhost:3306/test?useSSL=false&allowMultiQueries=true

2.userMapper.xml中

        <update id="updateUser">
		set names utf8mb4;
                update user set nickname='☺' where id = "1";
	</update>

但是每次都使用 set names utf8mb4; 来设置连接肯定太过麻烦，所以需要采用一种方式对Java数据连接在初始化的时候就进行设置

在application.properties中添加连接池初始化时的设置

spring.datasource.connection-init-sqls=set names utf8mb4;

但是发现配置在这里的并没有执行，所以重写一个DruidConfig

import java.sql.SQLException;
import java.util.List;

import javax.sql.DataSource;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;

import com.alibaba.druid.pool.DruidDataSource; 
@Configuration  
public class DruidConfig {  
    private Logger logger = LoggerFactory.getLogger(DruidConfig.class);  
     
    @Value("${spring.datasource.connection-init-sqls}")  
    private List<String> connectionInitSqls;  
    
    @Value("${spring.datasource.url}")  
    private String dbUrl;  
      
    @Value("${spring.datasource.username}")  
    private String username;  
      
    @Value("${spring.datasource.password}")  
    private String password;  
      
    @Value("${spring.datasource.driverClassName}")  
    private String driverClassName;  
      
    @Value("${spring.datasource.initialSize}")  
    private int initialSize;  
      
    @Value("${spring.datasource.minIdle}")  
    private int minIdle;  
      
    @Value("${spring.datasource.maxActive}")  
    private int maxActive;  
      
    @Value("${spring.datasource.maxWait}")  
    private int maxWait;  
      
    @Value("${spring.datasource.timeBetweenEvictionRunsMillis}")  
    private int timeBetweenEvictionRunsMillis;  
      
    @Value("${spring.datasource.minEvictableIdleTimeMillis}")  
    private int minEvictableIdleTimeMillis;  
      
    @Value("${spring.datasource.validationQuery}")  
    private String validationQuery;  
      
    @Value("${spring.datasource.testWhileIdle}")  
    private boolean testWhileIdle;  
      
    @Value("${spring.datasource.testOnBorrow}")  
    private boolean testOnBorrow;  
      
    @Value("${spring.datasource.testOnReturn}")  
    private boolean testOnReturn;  
      
    @Value("${spring.datasource.poolPreparedStatements}")  
    private boolean poolPreparedStatements;  
      
    @Value("${spring.datasource.maxPoolPreparedStatementPerConnectionSize}")  
    private int maxPoolPreparedStatementPerConnectionSize;  
      
 
      
    @Value("{spring.datasource.connectionProperties}")  
    private String connectionProperties;  
      
    @Bean     //声明其为Bean实例  
    @Primary  //在同样的DataSource中，首先使用被标注的DataSource  
    public DataSource dataSource(){  
        DruidDataSource datasource = new DruidDataSource();  
          
        datasource.setUrl(this.dbUrl);  
        datasource.setUsername(username);  
        datasource.setPassword(password);  
        datasource.setDriverClassName(driverClassName);  
          
        //configuration  
        datasource.setInitialSize(initialSize);  
        datasource.setMinIdle(minIdle);  
        datasource.setMaxActive(maxActive);  
        datasource.setMaxWait(maxWait);  
        datasource.setTimeBetweenEvictionRunsMillis(timeBetweenEvictionRunsMillis);  
        datasource.setMinEvictableIdleTimeMillis(minEvictableIdleTimeMillis);  
        datasource.setValidationQuery(validationQuery);  
        datasource.setTestWhileIdle(testWhileIdle);  
        datasource.setTestOnBorrow(testOnBorrow);  
        datasource.setTestOnReturn(testOnReturn);  
        datasource.setPoolPreparedStatements(poolPreparedStatements);  
        datasource.setMaxPoolPreparedStatementPerConnectionSize(maxPoolPreparedStatementPerConnectionSize);  
        datasource.setConnectionInitSqls(connectionInitSqls);
//        try {  
////            datasource.setFilters(filters);  	
//        } catch (SQLException e) {  
//            logger.error("druid configuration initialization filter", e);  
//        }  
        datasource.setConnectionProperties(connectionProperties);  
          
        return datasource;  
    }  
}

这样在项目启动时就会设置了数据链接，从而解决问题，这样Java就不会报

Caused by: java.sql.SQLException: Incorrect string value: '\xF0\x9F\x98\xAF' for column 'nickname' at row 1