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using System;
using System.Collections.Generic;
using System.Linq;public class StageConfig
{public string Name { get; set; }public bool Replace { get; set; }public bool IfNotExists { get; set; }public string StorageIntegration { get; set; }public string Url { get; set; }public string Credentials { get; set; }public FileFormatOptions FileFormat { get; set; }public Dictionary<string, string> CopyOptions { get; set; }public string Comment { get; set; }
}public class FileFormatOptions
{public string FormatName { get; set; }public string Type { get; set; }public Dictionary<string, string> FormatOptions { get; set; } = new Dictionary<string, string>();
}public class StageSqlGenerator
{public static string GenerateCreateStageSql(StageConfig config){var replaceModifier = config.Replace ? "OR REPLACE " : "";var ifNotExistsModifier = config.IfNotExists ? "IF NOT EXISTS " : "";var clauses = new List<string>();AddStorageIntegration(config, clauses);AddUrl(config, clauses);AddCredentials(config, clauses);AddFileFormat(config, clauses);AddCopyOptions(config, clauses);AddComment(config, clauses);return FormatFinalSql(config, replaceModifier, ifNotExistsModifier, clauses);}private static void AddStorageIntegration(StageConfig config, List<string> clauses){if (!string.IsNullOrEmpty(config.StorageIntegration)){clauses.Add($"STORAGE_INTEGRATION = {config.StorageIntegration}");}}private static void AddUrl(StageConfig config, List<string> clauses){if (!string.IsNullOrEmpty(config.Url)){clauses.Add($"URL = '{EscapeSqlString(config.Url)}'");}}private static void AddCredentials(StageConfig config, List<string> clauses){if (!string.IsNullOrEmpty(config.Credentials)){clauses.Add($"CREDENTIALS = ( {config.Credentials} )");}}private static void AddFileFormat(StageConfig config, List<string> clauses){if (config.FileFormat == null) return;var ff = config.FileFormat;if (!string.IsNullOrEmpty(ff.FormatName)){clauses.Add($"FILE_FORMAT = ( FORMAT_NAME = '{EscapeSqlString(ff.FormatName)}' )");}else if (!string.IsNullOrEmpty(ff.Type)){var typeClause = $"TYPE = {ff.Type}";var options = ff.FormatOptions.Select(kv => $"{kv.Key} = {kv.Value}");clauses.Add(options.Any()? $"FILE_FORMAT = ( {typeClause}, {string.Join(", ", options)} )": $"FILE_FORMAT = ( {typeClause} )");}}private static void AddCopyOptions(StageConfig config, List<string> clauses){if (config.CopyOptions?.Any() != true) return;var copyOptions = config.CopyOptions.Select(kv => $"{kv.Key} = {kv.Value}");clauses.Add($"COPY_OPTIONS = ( {string.Join(", ", copyOptions)} )");}private static void AddComment(StageConfig config, List<string> clauses){if (!string.IsNullOrEmpty(config.Comment)){clauses.Add($"COMMENT = '{EscapeSqlString(config.Comment)}'");}}private static string FormatFinalSql(StageConfig config, string replaceModifier, string ifNotExistsModifier, List<string> clauses){return $"CREATE {replaceModifier}STAGE {ifNotExistsModifier}{config.Name}" +(clauses.Any() ? $"\n  {string.Join("\n  ", clauses)};" : ";");}private static string EscapeSqlString(string input){return input?.Replace("'", "''") ?? string.Empty;}
}// 使用示例
public class Program
{public static void Main(){var config = new StageConfig{Name = "my_s3_stage",Replace = true,Url = "s3://mybucket/path/",Credentials = "AWS_KEY_ID='AKIAXXX' AWS_SECRET_KEY='XXX'",FileFormat = new FileFormatOptions{Type = "CSV",FormatOptions = new Dictionary<string, string>{{ "FIELD_DELIMITER", "','" },{ "SKIP_HEADER", "1" }}},CopyOptions = new Dictionary<string, string>{{ "ON_ERROR", "'CONTINUE'" }},Comment = "Production stage for customer data"};var sql = StageSqlGenerator.GenerateCreateStageSql(config);Console.WriteLine(sql);}
}

生成的SQL语句示例：

CREATE OR REPLACE STAGE my_s3_stageURL = 's3://mybucket/path/'CREDENTIALS = ( AWS_KEY_ID='AKIAXXX' AWS_SECRET_KEY='XXX' )FILE_FORMAT = ( TYPE = CSV, FIELD_DELIMITER = ',', SKIP_HEADER = 1 )COPY_OPTIONS = ( ON_ERROR = 'CONTINUE' )COMMENT = 'Production stage for customer data';

实现说明：

1. 配置类结构：StageConfig包含所有可能的阶段配置参数，FileFormatOptions专门处理文件格式配置
2. SQL生成逻辑：
   • 自动处理OR REPLACE和IF NOT EXISTS修饰符
   • 按正确顺序拼接各个配置参数
   • 自动处理单引号转义
   • 支持嵌套的文件格式和复制选项配置
3. 扩展性：采用模块化设计，每个配置部分有独立的处理方法，方便后续扩展
4. 格式处理：自动格式化生成的SQL语句，保持Snowflake SQL规范风格
5. 安全处理：对字符串值进行基本的SQL注入防护（单引号转义）