Spring Boot 使用Mybatis注解开发增删改查

使用逆向工程是遇到的错误

• 错误描述

org.apache.ibatis.binding.BindingException: Invalid bound statement (not found): com.fei.mapper.VideoMapper.selectByExample

• 解决办法

在application.properties中增加如下配置

#============================#
#====== mybatis config ======#
#============================#
mybatis.type-aliases-package=com.fei.domain
mybatis.mapper-locations=classpath:mapper/*.xml

# open camel rule mapping
mybatis.configuration.map-underscore-to-camel-case=true
# show sql statement in console
mybatis.configuration.log-impl=org.apache.ibatis.logging.stdout.StdOutImpl

使用Mybatis注解开发增删改查

import org.apache.ibatis.annotations.Delete;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Options;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Result;
import org.apache.ibatis.annotations.Results;
import org.apache.ibatis.annotations.Select;
import org.apache.ibatis.annotations.Update;

public interface VideoMapper {
	/**
	 * 自己写的方法，使用// mapper接口扫描@MapperScan("com.fei.mapper")
	 *
	 * @return
	 */
	@Select("select * from video")
	@Results({
			// 结果集映射规则，自己编写接口方法时需要指定，若使用逆向工程自动生成的方法则不需要指定
			// column对应数据库表字段，property对应Java对象属性
			// 但是这种方法，假如数据库表字段很多会很麻烦，所以可以在application.properties配置文件中开启驼峰映射规则
			// mybatis.configuration.map-underscore-to-camel-case=true
			@Result(column = "create_time", property = "createTime"),
			@Result(column = "cover_img", property = "coverImg"), @Result(column = "view_num", property = "viewNum") })
	List<Video> findAll();

	@Select("select * from video where id = #{id}")
	Video findById(int id);

	@Update("update video set title = #{title} where id = #{id}")
	int update(Video video);

	@Delete("delete from video where id = #{id}")
	int delete(int id);

	@Insert("insert into video (title, summary, cover_img, view_num, price, create_time, online, point) "
			+ " values (#{title}, #{summary}, #{coverImg}, #{viewNum}, #{price}, #{createTime}, #{online}, #{point})")
	// 获取自增id
	@Options(useGeneratedKeys = true, keyProperty = "id", keyColumn = "id")
	int save(Video video);
}