mybatis-spring-boot, org.apache.ibatis.binding.BindingException: 无效的绑定语句

Question

mybatis-spring-boot-sample

我添加了一项服务以通过@Autowired 获取 CityMapper，但它失败了。 我更改了一些内容，如下所示：

@SpringBootApplication
public class SampleMybatisApplication implements CommandLineRunner {

    @Autowired
    private CityService cityService;

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

    @Override
    public void run(String... args) throws Exception {
        System.out.println(this.cityService.getCityById(1L));
    }

}

添加服务：

public interface CityService {
    City getCityById(Long id);
}

它的实现：

@Service
public class CityServiceImpl implements CityService {

    @Autowired
    private CityMapper cityMapper;

    @Override
    public City getCityById(Long id) {
        City city = null;
        try{
            city = cityMapper.selectCityById(id);
            // maybe, I want to do something else over here.
        }catch (Exception e) {
            e.printStackTrace();
        }
        return city;
    }

}

和 CityMapper ：

@Repository
public class CityMapper {

    @Autowired
    private SqlSessionTemplate sqlSessionTemplate;

    public City selectCityById(long id) {
        return this.sqlSessionTemplate.selectOne("selectCityById", id);
    }

}

并且错误显示：

2016-04-09 16:38:47.400 ERROR 2017 --- [           main] o.s.boot.SpringApplication               : Application startup failed

java.lang.IllegalStateException: Failed to execute CommandLineRunner
    at org.springframework.boot.SpringApplication.callRunner(SpringApplication.java:795) [spring-boot-1.3.0.RELEASE.jar:1.3.0.RELEASE]
    at org.springframework.boot.SpringApplication.callRunners(SpringApplication.java:776) [spring-boot-1.3.0.RELEASE.jar:1.3.0.RELEASE]
    at org.springframework.boot.SpringApplication.afterRefresh(SpringApplication.java:763) [spring-boot-1.3.0.RELEASE.jar:1.3.0.RELEASE]
    at org.springframework.boot.SpringApplication.doRun(SpringApplication.java:356) [spring-boot-1.3.0.RELEASE.jar:1.3.0.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:295) [spring-boot-1.3.0.RELEASE.jar:1.3.0.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1112) [spring-boot-1.3.0.RELEASE.jar:1.3.0.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1101) [spring-boot-1.3.0.RELEASE.jar:1.3.0.RELEASE]
    at sample.mybatis.SampleMybatisApplication.main(SampleMybatisApplication.java:35) [classes/:na]
Caused by: org.apache.ibatis.binding.BindingException: Invalid bound statement (not found): sample.mybatis.service.CityService.getCityById
    at org.apache.ibatis.binding.MapperMethod$SqlCommand.<init>(MapperMethod.java:196) ~[mybatis-3.3.0.jar:3.3.0]
    at org.apache.ibatis.binding.MapperMethod.<init>(MapperMethod.java:44) ~[mybatis-3.3.0.jar:3.3.0]
    at org.apache.ibatis.binding.MapperProxy.cachedMapperMethod(MapperProxy.java:59) ~[mybatis-3.3.0.jar:3.3.0]
    at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:52) ~[mybatis-3.3.0.jar:3.3.0]
    at com.sun.proxy.$Proxy35.getCityById(Unknown Source) ~[na:na]
    at sample.mybatis.SampleMybatisApplication.run(SampleMybatisApplication.java:40) [classes/:na]
    at org.springframework.boot.SpringApplication.callRunner(SpringApplication.java:792) [spring-boot-1.3.0.RELEASE.jar:1.3.0.RELEASE]

Answer 1

我用这个方法，可以通过compile。所以mapper和SQL.xml绑定的问题是个问题

public interface CityMapper { @Select("your sql statement") public City selectCityById(long id); }

Answer 2

在我的情况下，这完全不同 我有 2 个 JARS，但两个 JARS 错误地在同一个命名空间中有相同的 XML 文件

这使得问题来来去去，因为错误取决于在 tomcat 中加载 jar 的顺序

Answer 3

在我的例子中，我使用 mybatis-generator 生成了一个 mapper.xml，

重点是，我将此文件移动到另一个包中： com.xxx.cust.mapper 到 com.xxx.frame.mapper，所以<mapper namespace="com.xxx.cust.mapper.XXXMapper"> 是错误的。

Answer 4

这是 mybatis-spring-boot-starter 中的一个错误。您的界面 CityMapper 已自动注册为映射器，它不应该。 1.1.0 修复了这个问题。

Answer 5

您的实施有什么特别的原因吗？

该错误表明您缺少通常通过以下方式之一完成的映射器：

public interface CityMapper {
    @Select("your sql statement")
    public City selectCityById(long id);
}

或者

public interface CityMapper{
    public City selectCityById(long id);
}

与

CityMapper.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="CityMapper">
    <select id="findById" resultType="City"></select>
</mapper>