SpringBoot整合mybatis查詢數據庫結果中的字段為null時不返回問題解決方法

多數據源情況：

直接在配置文件application.properties中增加字段配置信息：

對於多數據源的情況，需要在數據源config配置類中文件中SqlSessionFactory bean中增加一段代碼：

org.apache.ibatis.session.Configuration configuration = new org.apache.ibatis.session.Configuration();
configuration.setCallSettersOnNulls(true);
factoryBean.setConfiguration(configuration);

例如：

 

 

 

package com.xxx.config;

import com.alibaba.druid.filter.config.ConfigTools;
import com.alibaba.druid.pool.DruidDataSource;
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.beans.factory.annotation.Value;
import org.springframework.boot.orm.jpa.hibernate.SpringPhysicalNamingStrategy;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.jdbc.core.JdbcTemplate;

import org.springframework.transaction.PlatformTransactionManager;

import javax.sql.DataSource;
import java.util.HashMap;

/**
 * @author
 */
@Configuration
@MapperScan(basePackages = "xxx.common.dao.informix", sqlSessionFactoryRef = "gp_khyxSqlSessionFactory")
public class PrimaryConfig {
    @Value("${spring.datasource.primary.driver-class-name}")
    private String drivername;
    @Value("${spring.datasource.primary.url}")
    private String url;
    @Value("${spring.datasource.primary.password}")
    private String password;
    @Value("${spring.datasource.primary.username}")
    private String username;
    @Value("${spring.datasource.primary.publicKey}")
    private String publicKey;


    @Primary
    @Bean(name = "gp_khyxDataSource")
    public DataSource primaryDataSource() {
//        DriverManagerDataSource dataSource
//                = new DriverManagerDataSource();
        DruidDataSource dataSource = new DruidDataSource();
        try {
            dataSource.setValidationQuery("SELECT current FROM sysmaster:sysshmvals");
            dataSource.setDriverClassName(drivername);
            dataSource.setUrl(url);
            dataSource.setUsername(username);
            //dataSource.setPassword(password);
            dataSource.setPassword(ConfigTools.decrypt(publicKey, password));
        } catch (Exception e) {
            e.printStackTrace();
        }
        return dataSource;
    }


    @Bean(name = "gp_khyxJdbcTemplate")
    public JdbcTemplate secondaryJdbcTemplate(
            @Qualifier("gp_khyxDataSource") DataSource dataSource) {
        return new JdbcTemplate(dataSource);
    }

    @Bean(name = "gp_khyxSqlSessionFactory")
    // 表示這個數據源是默認數據源
    @Primary
    // @Qualifier表示查找Spring容器中名字為test1DataSource的對象
    public SqlSessionFactory test1SqlSessionFactory(@Qualifier("gp_khyxDataSource") DataSource datasource)
            throws Exception {
        SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
        bean.setDataSource(datasource);

        org.apache.ibatis.session.Configuration configuration=new org.apache.ibatis.session.Configuration();
        configuration.setCallSettersOnNulls(true);
        bean.setConfiguration(configuration);


        bean.setMapperLocations(
                // 設置mybatis的xml所在位置
                new PathMatchingResourcePatternResolver().getResources("classpath:mapper/informix/*.xml"));
        return bean.getObject();
    }

    @Bean("gp_khyxSqlSessionTemplate")
    // 表示這個數據源是默認數據源
    @Primary
    public SqlSessionTemplate sqlsessiontemplate(
            @Qualifier("gp_khyxSqlSessionFactory") SqlSessionFactory sessionfactory) {
        return new SqlSessionTemplate(sessionfactory);
    }
}

 

不是多數據源情況

直接在配置文件application.properties中增加字段配置信息：

Mybatis.configuration.call-setters-on-nulls:true

yml：

mybatis:
  configuration:
    call-setters-on-nulls: true

參考原文：https://blog.csdn.net/STIll_ly/article/details/103993486