SpringBoot整合mybatis常见问题(小结)
时间：2022-11-20 10:14:14|栏目：JAVA代码|点击： 次
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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