其他
SpringBoot + Mybatis-puls + ClickHouse 增删改查入门教程
点击“终码一生”，关注，置顶公众号
每日技术干货，第一时间送达！
1
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。
2
基于 Mybatis-puls
update 、updateById 、 delete 函数
1、SqlMethodDiv.java文件枚举类，对sql脚本定义
/**
* @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} %s\n</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} %s\n</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 %s\n</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 AbstractMethod 重载 injectMappedStatement
/**
* @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 = optlockVersion(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.convertIf(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
/**
* 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
/**
* @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
@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);
}
}| Github地址 | https://github.com/saimen90/clickhouse |
来源：blog.csdn.net/qq_15371293/article/details/117090780
PS：防止找不到本篇文章，可以收藏点赞，方便翻阅查找哦。
往期推荐