SpringBoot整合mybatis常见问题(小结)

Spring中常见问题

1.NoSuchBeanDefinitionException

2.'..Service' that could not be found service找不到

3.port 80 was already in use 端口号被占用

4.TemplateInputException 模板解析异常或找不到模板

• 1.检查模板所在的目录是否与配置的前缀目录相同
• 2.检查返回的模板是否存在,返回值类型是否一致
• 3.检查配置前缀时是否以"/"斜杠结尾
• 4.控制层的url与客户端的ur是否一致

5. 404异常 访问资源不存在

6. 500异常 500异常要查看控制台

Mybatis中常见问题

1.springboot中添加maven依赖

2.BadSqlGrammarException 错误的sql语句

3.BindingException 绑定异常

• 1.检查映射文件的路径配置与实际存储位置是否一致
• 2.检查dao接口的类名是否与映射文件的namespace值相同(不能有空格)
• 3.检查dao接口中的方法名是否在映射文件中有对应的id

4.IllegalArgumentException

原因:同样说我sql映射是否出现了重复性的定义(例如:分别以注解方式和xml配置文件方式进行定义,也就是说在同一个namespace下出现了重复的元素id)

5.SAXParseException xml解析问题

补充

问题一：Mapper类 autowired失败

原因：扫描mapper包没有配置或配置不正确

解决：

方案一：

1. 启动类加@MapperScan("mapperPackagePath")

方案二：

增加配置类：

package com.yx.readingwebsite.config;

import org.mybatis.spring.mapper.MapperScannerConfigurer;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

/**
 * MapperScannerConfigurer 配置DAO层
 */

@Configuration
public class MyBatisMapperScannerConfig {
  @Bean
  public MapperScannerConfigurer getMapperScannerConfigurer(){
    MapperScannerConfigurer msc = new MapperScannerConfigurer();
    msc.setSqlSessionFactoryBeanName("sqlSessionFactory");
    msc.setBasePackage("com.yx.readingwebsite.mapper");
    return msc;
  }
}

问题二：Mapper扫描成功后，继续报错，org.apache.ibatis.binding.BindingException: Invalid bound statement (not found):

原因：xml的mapper SQL 和 Mapper接口没有绑定

解决：

方案一：全局配置文件application.yml增加mybatis配置【xml mapper包在resource目录下】

mybatis:
 mapper-locations: classpath:mapper/*.xml

方案二：增加配置类

package com.yx.readingwebsite.config;

import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.SqlSessionTemplate;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.io.Resource;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;
import org.springframework.transaction.PlatformTransactionManager;
import org.springframework.transaction.annotation.EnableTransactionManagement;
import org.springframework.transaction.annotation.TransactionManagementConfigurer;

import javax.sql.DataSource;

/**
 * 配置MyBatis,引入数据源，sqlSessionFactory,sqlSessionTemplate,事务管理器
 */

@Configuration //配置类
@EnableTransactionManagement //允许使用事务管理器
public class MyBatisModelConfig implements TransactionManagementConfigurer {

  @Autowired
  private DataSource dataSource;

  @Bean(name = "sqlSessionFactory")
  public SqlSessionFactory getSqlSessionFactory(){
    SqlSessionFactoryBean ssfb = new SqlSessionFactoryBean();
    ssfb.setDataSource(dataSource); //设置数据源
    ssfb.setTypeAliasesPackage("com.yx.readingwebsite.model");  //设置扫描模型包【po】
    try {
      Resource[] resources = new PathMatchingResourcePatternResolver()
          .getResources("classpath:mapper/*.xml");
      ssfb.setMapperLocations(resources);
      return ssfb.getObject();
    } catch (Exception e) {
      e.printStackTrace();
      throw new RuntimeException();
    }
  }

  @Bean  //获得Session 模板，从而获得Session
  public SqlSessionTemplate getSqlSessionTemplate(SqlSessionFactory sqlSessionFactory){
    return new SqlSessionTemplate(sqlSessionFactory);
  }

  @Override  //事务管理器
  public PlatformTransactionManager annotationDrivenTransactionManager() {
    return new DataSourceTransactionManager(dataSource);
  }
}

需要注意的是，xml版的mybatis一定要在sqlSessionFactory中指定mapperLocations,即下图

总结：
两种配置方案。方案一，使用配置类；方案二，使用配置文件。完整配置如下：

方案一：配置类

package com.yx.readingwebsite.config;

import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.SqlSessionTemplate;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.io.Resource;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;
import org.springframework.transaction.PlatformTransactionManager;
import org.springframework.transaction.annotation.EnableTransactionManagement;
import org.springframework.transaction.annotation.TransactionManagementConfigurer;

import javax.sql.DataSource;

/**
 * 配置MyBatis,引入数据源，sqlSessionFactory,sqlSessionTemplate,事务管理器
 */

@Configuration //配置类
@EnableTransactionManagement //允许使用事务管理器
public class MyBatisModelConfig implements TransactionManagementConfigurer {

  @Autowired
  private DataSource dataSource;

  @Bean(name = "sqlSessionFactory")
  public SqlSessionFactory getSqlSessionFactory(){
    SqlSessionFactoryBean ssfb = new SqlSessionFactoryBean();
    ssfb.setDataSource(dataSource); //设置数据源
    ssfb.setTypeAliasesPackage("com.yx.readingwebsite.model");  //设置扫描模型包【po】
    try {
      Resource[] resources = new PathMatchingResourcePatternResolver()
          .getResources("classpath:mapper/*.xml");
      ssfb.setMapperLocations(resources);
      return ssfb.getObject();
    } catch (Exception e) {
      e.printStackTrace();
      throw new RuntimeException();
    }
  }

  @Bean  //获得Session 模板，从而获得Session
  public SqlSessionTemplate getSqlSessionTemplate(SqlSessionFactory sqlSessionFactory){
    return new SqlSessionTemplate(sqlSessionFactory);
  }

  @Override  //事务管理器
  public PlatformTransactionManager annotationDrivenTransactionManager() {
    return new DataSourceTransactionManager(dataSource);
  }
}

package com.yx.readingwebsite.config;

import org.mybatis.spring.mapper.MapperScannerConfigurer;
import org.springframework.boot.autoconfigure.AutoConfigureAfter;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

/**
 * MapperScannerConfigurer 配置DAO层
 */

@Configuration
@AutoConfigureAfter(MyBatisModelConfig.class)
public class MyBatisMapperScannerConfig {
  @Bean
  public MapperScannerConfigurer getMapperScannerConfigurer(){
    MapperScannerConfigurer msc = new MapperScannerConfigurer();
    msc.setSqlSessionFactoryBeanName("sqlSessionFactory");
    msc.setBasePackage("com.yx.readingwebsite.mapper");
    return msc;
  }
}

方案二：配置文件 application.yml

spring:
 datasource:
  url: jdbc:mysql://127.0.0.1:3306/readingWebsite?useUnicode=true&characterEncoding=utf-8
  username:
  password:
  driver-class-name: com.mysql.jdbc.Driver
  max-active: 100
  max-idle: 10
  max-wait: 10000
  default-auto-commit: false
  time-between-eviction-runs-millis: 30000
  min-evictable-idle-time-millis: 30000
  test-while-idle: true
  test-on-borrow: true
  test-on-return: true
  validation-query: SELECT 1

mybatis:
 mapper-locations: classpath:mapper/*.xml

package com.yx.readingwebsite;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
@MapperScan("com.yx.readingwebsite")
public class ReadingWebsiteApplication {

  public static void main(String[] args) {
    SpringApplication.run(ReadingWebsiteApplication.class, args);
  }

}

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