package com.hxd.sqlAbout;

import com.baomidou.mybatisplus.core.injector.AbstractMethod;
import com.baomidou.mybatisplus.core.metadata.TableInfo;
import org.apache.ibatis.mapping.MappedStatement;
import org.apache.ibatis.mapping.SqlSource;

public class DeleteAllMethod extends AbstractMethod {

    @Override
    public MappedStatement injectMappedStatement(Class<?> mapperClass, Class<?> modelClass, TableInfo tableInfo) {
        String sql="delete from "+tableInfo.getTableName();
        String method="deleteAll";
        SqlSource sqlSource = languageDriver.createSqlSource(configuration, sql, modelClass);

        return addDeleteMappedStatement(mapperClass,method,sqlSource);
    }
}

package com.hxd.sqlAbout;

import com.baomidou.mybatisplus.core.injector.AbstractMethod;
import com.baomidou.mybatisplus.core.injector.DefaultSqlInjector;
import com.baomidou.mybatisplus.core.injector.methods.*;
import org.springframework.stereotype.Component;

import java.util.List;


@Component
public class SqlInjector extends DefaultSqlInjector {
    @Override
    public List<AbstractMethod> getMethodList(Class<?> mapperClass) {
        List<AbstractMethod> methodList = super.getMethodList(mapperClass);
        methodList.add(new DeleteAllMethod());
        return methodList;
    }
}

package com.hxd.mapper;

import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.hxd.pojo.User;
import org.springframework.stereotype.Repository;


@Repository
public interface UserMapper extends BaseMapper<User> {
 int deleteAll();
}

@RequestMapping("deletealluser")
public String deleteAllUser(){
    int i= userService.deleteAllUser();
    if(i>0){
        return "删除所有成功";
    }
    return "删除所有失败";
}

public int deleteAllUser() {
    int i = userMapper.deleteAll();
    return i;
}