Spring Boot + Mybatis Plus + ClickHouse 轻松实现增删改查，看了必懂。。

来源：blog.csdn.net/qq_15371293/article/details/117090780

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} %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

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.SqlSource; /** * @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

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

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：
https://github.com/javastacks/spring-boot-best-practice

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);    } }

源码：https://github.com/saimen90/clickhouse

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