Java写入ClickHouse-CSDN博客

本文链接：https://blog.csdn.net/lck_csdn/article/details/129199240

文章介绍了如何在Java项目中添加ClickhouseJDBC依赖，创建实体类，并实现数据插入功能。通过BalancedClickhouseDataSource建立连接，预编译SQL语句，将对象数据批量插入到Clickhouse的person表中。

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文章目录

一、添加依赖
二、sink实现
- 1、实体类
- 2、sink代码

一、添加依赖

在pom.xml 增加clickhouse 客户端依赖

<dependency>
    <groupId>ru.yandex.clickhouse</groupId>
    <artifactId>clickhouse-jdbc</artifactId>
    <version>0.2.4</version>
</dependency>

二、sink实现

1、实体类

package bean;

public class Person {
    public int id;
    public String name;
    public int age;

    public Person(int id, String name, int age) {
        this.id = id;
        this.name = name;
        this.age = age;
    }
}

2、sink代码

import bean.Person;
import ru.yandex.clickhouse.BalancedClickhouseDataSource;
import ru.yandex.clickhouse.ClickHouseConnection;
import ru.yandex.clickhouse.settings.ClickHouseProperties;

import java.lang.reflect.Field;
import java.sql.PreparedStatement;
import java.sql.SQLException;

public class ClickHouseSink{

    private static final ClickHouseProperties properties = new ClickHouseProperties();
    private static BalancedClickhouseDataSource ds;
    private static ClickHouseConnection connection;
    private static PreparedStatement ps;
    //插入语句
    private static final String SQL = "insert into test.person(id,name,age) values(?,?,?)";

    /**
     * 初始化配置
     */
    private static void initialize() {
        try {
            properties.setUser("distributed-write");
            properties.setPassword("CloudMinds#");
            ds = new BalancedClickhouseDataSource("jdbc:clickhouse://172.16.32.96:9090/ceph_meta", properties);
            connection = ds.getConnection();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 关闭连接
     */
    private static void close() {
        if (ps != null) {
            try {
                ps.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        if (connection != null) {
            try {
                connection.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }

    public static void main(String[] args) {
        initialize();
        Person person = new Person(10,"王五",15);
        insertData(SQL,person);
    }

    /**
     * 插入数据到clickhouse
     */
    public static <T> void insertData(String sql,T line ) {
        try {
            ps = connection.prepareStatement(sql);
            Field[] fields = line.getClass().getDeclaredFields();
            for (int i = 0; i < fields.length; i++) {
                Field field = fields[i];
                try {
                    Object o = field.get(line);
                    ps.setObject(i + 1, o);
                } catch (IllegalAccessException e) {
                    e.printStackTrace();
                }
            }
            ps.addBatch();
            ps.executeBatch();
            ps.clearBatch();
            close();
            connection.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }