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SpringBoot整合mybatis常見問題(小結(jié))

更新時(shí)間：2020年12月25日 09:54:27 作者：哇啦哇啦哇

這篇文章主要介紹了SpringBoot整合mybatis常見問題(小結(jié))，文中通過示例代碼介紹的非常詳細(xì)，對(duì)大家的學(xué)習(xí)或者工作具有一定的參考學(xué)習(xí)價(jià)值，需要的朋友們下面隨著小編來一起學(xué)習(xí)學(xué)習(xí)吧

Spring中常見問題

1.NoSuchBeanDefinitionException

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

3.port 80 was already in use 端口號(hào)被占用

4.TemplateInputException 模板解析異?；蛘也坏侥０?/p>

1.檢查模板所在的目錄是否與配置的前綴目錄相同
2.檢查返回的模板是否存在,返回值類型是否一致
3.檢查配置前綴時(shí)是否以"/"斜杠結(jié)尾
4.控制層的url與客戶端的ur是否一致

5. 404異常訪問資源不存在

6. 500異常 500異常要查看控制臺(tái)

Mybatis中常見問題

1.springboot中添加maven依賴

2.BadSqlGrammarException 錯(cuò)誤的sql語句

3.BindingException 綁定異常

1.檢查映射文件的路徑配置與實(shí)際存儲(chǔ)位置是否一致
2.檢查dao接口的類名是否與映射文件的namespace值相同(不能有空格)
3.檢查dao接口中的方法名是否在映射文件中有對(duì)應(yīng)的id

4.IllegalArgumentException

原因:同樣說我sql映射是否出現(xiàn)了重復(fù)性的定義(例如:分別以注解方式和xml配置文件方式進(jìn)行定義,也就是說在同一個(gè)namespace下出現(xiàn)了重復(fù)的元素id)

5.SAXParseException xml解析問題

補(bǔ)充

問題一：Mapper類 autowired失敗

原因：掃描mapper包沒有配置或配置不正確

解決：

方案一：

1. 啟動(dòng)類加@MapperScan("mapperPackagePath")

方案二：

增加配置類：

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

問題二：Mapper掃描成功后，繼續(xù)報(bào)錯(cuò)，org.apache.ibatis.binding.BindingException: Invalid bound statement (not found):

原因：xml的mapper SQL 和 Mapper接口沒有綁定

解決：

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

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

方案二：增加配置類

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,引入數(shù)據(jù)源，sqlSessionFactory,sqlSessionTemplate,事務(wù)管理器
 */
 
@Configuration //配置類
@EnableTransactionManagement //允許使用事務(wù)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); //設(shè)置數(shù)據(jù)源
    ssfb.setTypeAliasesPackage("com.yx.readingwebsite.model");  //設(shè)置掃描模型包【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  //獲得Session 模板，從而獲得Session
  public SqlSessionTemplate getSqlSessionTemplate(SqlSessionFactory sqlSessionFactory){
    return new SqlSessionTemplate(sqlSessionFactory);
  }
 
  @Override  //事務(wù)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,即下圖

總結(jié)：
兩種配置方案。方案一，使用配置類；方案二，使用配置文件。完整配置如下：

方案一：配置類

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,引入數(shù)據(jù)源，sqlSessionFactory,sqlSessionTemplate,事務(wù)管理器
 */
 
@Configuration //配置類
@EnableTransactionManagement //允許使用事務(wù)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); //設(shè)置數(shù)據(jù)源
    ssfb.setTypeAliasesPackage("com.yx.readingwebsite.model");  //設(shè)置掃描模型包【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  //獲得Session 模板，從而獲得Session
  public SqlSessionTemplate getSqlSessionTemplate(SqlSessionFactory sqlSessionFactory){
    return new SqlSessionTemplate(sqlSessionFactory);
  }
 
  @Override  //事務(wù)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層
 */
 
 
@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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