项目场景：

ClickHouse 操作基于 Mybatis-puls源码扩展开发。解决ClickHouse的修改和删除 SQL操作与 Mysql 不相同。

基于 Mybatis -puls：

update 、updateById 、 delete 函数

1、 SqlMethodDiv. Java 文件枚举类，对 Sql 脚本定义

 package com.demo.infrastructure.injector.enums;

/**
 * @author liuxiansong
 */public enum SqlMethodDiv {

    /**
     * 删除
     */    DELETE_BY_ID("deleteByIdClickHouse", "根据ID 删除一条数据", "< script >nALTER TABLE %s DELETE WHERE %s=#{%s}n</script>"),

    /**
     *  逻辑删除 
     */    LOGIC_DELETE_BY_ID("deleteByIdClickHouse", "根据ID 逻辑删除一条数据", "<script>nALTER TABLE %s UPDATE %s where %s=#{%s} %sn</script>"),

    /**
     * 修改 条件主键
     */    UPDATE_BY_ID("updateByIdClickHouse", "根据ID 选择修改数据", "<script>nALTER TABLE %s UPDATE %s where %s=#{%s} %sn</script>"),
    /**
     * 修改 条件主键
     */    UPDATE("updateClickHouse", "根据 whereEntity 条件，更新记录", "<script>nALTER TABLE %s UPDATE  %s %s %sn</script>");

     private  final String method;
    private final String desc;
    private final String sql;

    SqlMethodDiv(String method,  String  desc, String sql) {
        this.method = method;
        this.desc = desc;
        this.sql = sql;
    }

    public String getMethod() {
        return method;
    }

    public String getDesc() {
        return desc;
    }

    public String getSql() {
        return sql;
    }
}
  

2、 UpdateByIdClickHouse.java 类文件，继承 Abstract Method 重载 injectMappedStatement

 package com.demo.infrastructure.injector.methods;

import com.baomidou.mybatisplus.core.injector.AbstractMethod;
import com.baomidou.mybatisplus.core.metadata.TableInfo;
import com.baomidou.mybatisplus.core.toolkit.sql.SqlScriptUtils;
import com.demo.infrastructure.injector.enums.SqlMethodDiv;
import org.apache.ibatis.executor.keygen.NoKeyGenerator;
import org.apache.ibatis.mapping.MappedStatement;
import org.apache.ibatis.mapping. sql Source;

/**
 * @author liuxiansong
 * @date 2021-05-20
 * @desc 通过MybatisPlus源码 扩展修改
 */public class UpdateByIdClickHouse  extends  AbstractMethod {

    @Override
    public MappedStatement injectMappedStatement(Class<?> mapperClass, Class<?> modelClass, TableInfo tableInfo) {
        SqlMethodDiv sqlMethod = SqlMethodDiv.UPDATE_BY_ID;

        final String additional = opt lock Version(tableInfo) + tableInfo.getLogicDeleteSql(true, true);
        String sql = String.format(sqlMethod.getSql(), tableInfo.getTableName(),
                this.sqlSet(tableInfo.isWithLogicDelete(), false, tableInfo, false, ENTITY, ENTITY_DOT),
                tableInfo.getKeyColumn(), ENTITY_DOT + tableInfo.getKeyProperty(), additional);
        SqlSource sqlSource = languageDriver.createSqlSource(configuration, sql, modelClass);
        return this.addInsertMappedStatement(mapperClass, modelClass,
                sqlMethod.getMethod(), sqlSource, new NoKeyGenerator(), null, null);
    }


    /**
     * SQL 更新 set 语句
     *
     * @param logic  是否逻辑删除注入器
     * @param ew     是否存在 UpdateWrapper 条件
     * @param table  表信息
     * @param alias  别名
     * @param prefix 前缀
     * @return sql
     */    @Override
    protected String sqlSet(boolean logic,  boolean  ew, TableInfo table, boolean judgeAliasNull, final String alias,
                            final String prefix) {
        String sqlScript = table.getAllSqlSet(logic, prefix);
        if (judgeAliasNull) {
            sqlScript = SqlScriptUtils. convert If(sqlScript, String.format("%s != null", alias), true);
        }
        if (ew) {
            sqlScript += NEWLINE;
            sqlScript += SqlScriptUtils.convertIf(SqlScriptUtils.unSafeParam(U_WRAPPER_SQL_SET),
                    String.format("%s != null and %s != null", WRAPPER, U_WRAPPER_SQL_SET), false);
        }
        sqlScript = convertSet(sqlScript);
        return sqlScript;
    }

    /**
     * 去掉sest 和 suffixOverrides=","代表去掉第一个逗号
     *
     * @param sqlScript
     * @return
     */    public  static  String convertSet(final String sqlScript) {
        return "<trim prefix="" suffixOverrides=","> " + sqlScript + "n" + "</trim>";
    }
}
  

3、 ClickHouseSqlInjector.java 注册方法，继承 DefaultSqlInjector

 package com.demo.infrastructure.injector;
 
import com.baomidou.mybatisplus.core.injector.AbstractMethod;
import com.baomidou.mybatisplus.core.injector.DefaultSqlInjector;
import com.demo.infrastructure.injector.methods.DeleteClickHouse;
import com.demo.infrastructure.injector.methods.UpdateByIdClickHouse;
import com.demo.infrastructure.injector.methods.UpdateClickHouse;
 
import  java .util.List;
 
/**
 * 注册方法
 *
 * @author liuxiansong
 */public class ClickHouseSqlInjector extends DefaultSqlInjector {
 
    @Override
    public List<AbstractMethod> getMethodList(Class<?> mapperClass) {
        /**
         * 这里很重要，先要通过父类方法，获取到原有的集合，不然会自带的通用方法会失效的
         */        List<AbstractMethod> methodList = super.getMethodList(mapperClass);
        /***
         * 添加自定义方法类
         */        methodList.add(new UpdateByIdClickHouse());
        methodList.add(new UpdateClickHouse());
        methodList.add(new DeleteClickHouse());
        return methodList;
    }
}
  

4、编写SuperMapper 继承BaseMapper，让所有Mapper 继承extends、最新面试题整理好了，点击Java面试库小程序在线刷题。

 package com.demo.domain.mapper;
 
import com.baomidou.mybatisplus.core.conditions.Wrapper;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import org.apache.ibatis.annotations.Param;
 
import java.io.Serializable;
 
/**
 * @author liuxiansong
 * 自定义方法
 */@SuppressWarnings("all")
public interface SuperMapper<T> extends BaseMapper<T> {
 
    /**
     * @return
     * @Description: 删除并填充删除人信息
     * @param: id 主键id
     * @auther: zpq
     * @date: 2020/11/10 11:47 上午
     */    boolean updateByIdClickHouse(@Param("et") T entity);
 
 
    /**
     * @return
     * @Description: 删除并填充删除人信息
     * @param: id 主键id
     * @auther: zpq
     * @date: 2020/11/10 11:47 上午
     */    boolean updateClickHouse(@Param("et") T entity, @Param("ew") Wrapper<T> updateWrapper);
 
    /**
     * 主键删除
     *
     * @param id
     * @return
     */    int deleteByIdClickHouse(Serializable id);
}
  

5、单元测试看效果

Spring Boot 基础就不介绍了，推荐下这个实战教程：

 package com.demo.test;
 
import com.demo.DemoClickHouse;
import com.demo.domain.dataobject.User;
import com.demo.domain.service.UserService;
import com.demo.infrastructure.util.page.PageResult;
import org. junit .Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory. annotation .Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;
 
@RunWith(SpringRunner.class)
@SpringBootTest(classes = DemoClickHouse.class)
public class UserMapperTest {
 
    @Autowired
    UserService userService;
 
 
    @Test
    public  void  findById_Test() {
        User byId = userService.findById(1);
        System.out.println("查询用户ID=1信息：" + byId);
    }
 
    @Test
    public void page_Test() {
        User user = new User();
         Integer  page = 1;
        Integer limit = 2;
        PageResult<User> userList = userService.page(user, page, limit);
        System.out.println("查询用户信息分页：" + userList);
    }
 
    @Test
    public void create_Test() {
        User user = new User();
        user.setUserName("张三");
        user.setPassWord("123");
        user.setPhone("12312222");
        user.setEmail("326427540@qq.com");
        userService.create(user);
        System.out.println("创建：" + user);
    }
 
    @Test
    public void update_Test() {
        User user = new User();
        user.setId(1395347901827317761l);
        user.setUserName("小李飞刀");
        user.setPassWord("123");
        user.setPhone("12312222");
        user.setEmail("326427540@qq.com");
        userService.update(user);
        System.out.println("创建：" + user);
    }
 
 
    @Test
    public void delete_Test() {
        userService.delete(1l);
        System.out.println("删除：" + 1l);
    }
 
}