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在 C# 中連接 ClickHouse 數(shù)據(jù)庫(kù),您可以使用 ClickHouse.Client 庫(kù)。這個(gè)庫(kù)提供了對(duì) ClickHouse 數(shù)據(jù)庫(kù)的高效訪問(wèn)。以下是詳細(xì)的步驟指南,幫助您在 C# 項(xiàng)目中連接和操作 ClickHouse 數(shù)據(jù)庫(kù)。
1. 安裝 ClickHouse.Client 包
首先,您需要在您的項(xiàng)目中安裝 ClickHouse.Client 包。您可以使用 NuGet 包管理器來(lái)完成此操作。
使用 NuGet 包管理器控制臺(tái)
Install-Package ClickHouse.Client -Version 1.4.1
使用 .NET CLI
dotnet add package ClickHouse.Client --version 1.4.1
2. 配置 ClickHouse 客戶端
接下來(lái),您需要配置 ClickHouse 客戶端以連接到您的 ClickHouse 實(shí)例。以下是一個(gè)基本的配置示例。
using ClickHouse.Client;
using ClickHouse.Client.ADO;
using System;
using System.Data;namespace ClickHouseExample
{class Program{static void Main(string[] args){// 配置 ClickHouse 連接字符串string connectionString = "Host=127.0.0.1;Port=9000;Username=default;Password=;Database=default";using (var connection = new ClickHouseConnection(connectionString)){try{connection.Open();Console.WriteLine("Connected to ClickHouse!");// 執(zhí)行查詢using (var command = new ClickHouseCommand("SELECT * FROM system.numbers LIMIT 10", connection)){using (var reader = command.ExecuteReader()){while (reader.Read()){Console.WriteLine(reader[0]);}}}}catch (Exception ex){Console.WriteLine($"Error connecting to ClickHouse: {ex.Message}");}}}}
}
3. 創(chuàng)建表
如果您還沒(méi)有創(chuàng)建表,可以使用 ClickHouse.Client 創(chuàng)建一個(gè)新的表。
using ClickHouse.Client;
using ClickHouse.Client.ADO;
using System;namespace ClickHouseExample
{class Program{static void Main(string[] args){string connectionString = "Host=127.0.0.1;Port=9000;Username=default;Password=;Database=default";using (var connection = new ClickHouseConnection(connectionString)){try{connection.Open();Console.WriteLine("Connected to ClickHouse!");// 創(chuàng)建表string createTableQuery = @"CREATE TABLE IF NOT EXISTS my_table(id UInt32,name String,description String) ENGINE = MergeTree() ORDER BY id;";using (var command = new ClickHouseCommand(createTableQuery, connection)){command.ExecuteNonQuery();Console.WriteLine("Table created successfully.");}}catch (Exception ex){Console.WriteLine($"Error connecting to ClickHouse: {ex.Message}");}}}}
}
4. 插入數(shù)據(jù)
您可以使用 ClickHouse.Client 將數(shù)據(jù)插入到 ClickHouse 中。
using ClickHouse.Client;
using ClickHouse.Client.ADO;
using System;namespace ClickHouseExample
{class Program{static void Main(string[] args){string connectionString = "Host=127.0.0.1;Port=9000;Username=default;Password=;Database=default";using (var connection = new ClickHouseConnection(connectionString)){try{connection.Open();Console.WriteLine("Connected to ClickHouse!");// 插入數(shù)據(jù)string insertQuery = @"INSERT INTO my_table (id, name, description) VALUES(1, 'Sample Document', 'This is a sample document.'),(2, 'Another Document', 'This is another sample document.');";using (var command = new ClickHouseCommand(insertQuery, connection)){command.ExecuteNonQuery();Console.WriteLine("Data inserted successfully.");}}catch (Exception ex){Console.WriteLine($"Error connecting to ClickHouse: {ex.Message}");}}}}
}
5. 查詢數(shù)據(jù)
您可以使用 ClickHouse.Client 執(zhí)行查詢以檢索數(shù)據(jù)。
using ClickHouse.Client;
using ClickHouse.Client.ADO;
using System;
using System.Data;namespace ClickHouseExample
{class Program{static void Main(string[] args){string connectionString = "Host=127.0.0.1;Port=9000;Username=default;Password=;Database=default";using (var connection = new ClickHouseConnection(connectionString)){try{connection.Open();Console.WriteLine("Connected to ClickHouse!");// 查詢數(shù)據(jù)string selectQuery = "SELECT * FROM my_table";using (var command = new ClickHouseCommand(selectQuery, connection)){using (var reader = command.ExecuteReader()){while (reader.Read()){Console.WriteLine($"Id: {reader["id"]}, Name: {reader["name"]}, Description: {reader["description"]}");}}}}catch (Exception ex){Console.WriteLine($"Error connecting to ClickHouse: {ex.Message}");}}}}
}
6. 更新數(shù)據(jù)
ClickHouse 不直接支持 UPDATE 操作,但您可以使用 ALTER TABLE ... UPDATE 語(yǔ)句來(lái)更新數(shù)據(jù)。不過(guò),這種操作相對(duì)復(fù)雜且性能較低,通常建議使用 INSERT 和 DELETE 組合來(lái)實(shí)現(xiàn)類似的效果。
using ClickHouse.Client;
using ClickHouse.Client.ADO;
using System;namespace ClickHouseExample
{class Program{static void Main(string[] args){string connectionString = "Host=127.0.0.1;Port=9000;Username=default;Password=;Database=default";using (var connection = new ClickHouseConnection(connectionString)){try{connection.Open();Console.WriteLine("Connected to ClickHouse!");// 更新數(shù)據(jù)string updateQuery = @"ALTER TABLE my_table UPDATE name = 'Updated Document' WHERE id = 1;";using (var command = new ClickHouseCommand(updateQuery, connection)){command.ExecuteNonQuery();Console.WriteLine("Data updated successfully.");}}catch (Exception ex){Console.WriteLine($"Error connecting to ClickHouse: {ex.Message}");}}}}
}
7. 刪除數(shù)據(jù)
您可以使用 ClickHouse.Client 刪除數(shù)據(jù)。
using ClickHouse.Client;
using ClickHouse.Client.ADO;
using System;namespace ClickHouseExample
{class Program{static void Main(string[] args){string connectionString = "Host=127.0.0.1;Port=9000;Username=default;Password=;Database=default";using (var connection = new ClickHouseConnection(connectionString)){try{connection.Open();Console.WriteLine("Connected to ClickHouse!");// 刪除數(shù)據(jù)string deleteQuery = @"ALTER TABLE my_table DELETE WHERE id = 2;";using (var command = new ClickHouseCommand(deleteQuery, connection)){command.ExecuteNonQuery();Console.WriteLine("Data deleted successfully.");}}catch (Exception ex){Console.WriteLine($"Error connecting to ClickHouse: {ex.Message}");}}}}
}
總結(jié)
通過(guò)以上步驟,您可以在 C# 項(xiàng)目中成功連接和操作 ClickHouse 數(shù)據(jù)庫(kù)。ClickHouse.Client 提供了豐富的 API 來(lái)執(zhí)行各種操作,如創(chuàng)建表、插入數(shù)據(jù)、查詢數(shù)據(jù)、更新數(shù)據(jù)和刪除數(shù)據(jù)。確保您的 ClickHouse 實(shí)例正在運(yùn)行,并且客戶端配置正確,以便順利進(jìn)行這些操作。如果遇到任何問(wèn)題,可以參考 ClickHouse.Client 的官方文檔或社區(qū)資源以獲取更多幫助。
參考資料:
???ClickHouse 官方文檔 ?https://clickhouse.com/docs/zh/getting-started/install
?? ClickHouse.Client?https://github.com/yandex/ClickHouse.Client