SpringBoot整合mybatis常见问题(小结)
作者：哇啦哇啦哇
这篇文章主要介绍了SpringBoot整合mybatis常见问题(小结)，文中通过示例代码介绍的非常详细，对大家的学习或者工作具有一定的参考学习价值，需要的朋友们下面随着小编来一起学习学习吧
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);
}
}
到此这篇关于SpringBoot整合mybatis常见问题(小结)的文章就介绍到这了,更多相关SpringBoot整合mybatis问题内容请搜索脚本之家以前的文章或继续浏览下面的相关文章希望大家以后多多支持脚本之家！