当前位置：首页 > news >正文

C#程序实现将Teradata的存储过程转换为Azure Synapse Dedicated SQL pool的存储过程

news 2025/10/30 7:38:49

第一步：创建项目结构和基础类

// Program.cs
using System;
using System.IO;
using TeradataToSynapseConverter;namespace TeradataToSynapseConverter
{class Program{static void Main(string[] args){Console.WriteLine("=== Teradata 到 Azure Synapse 存储过程转换工具 ===");if (args.Length < 2){Console.WriteLine("用法: TeradataToSynapseConverter <输入文件/目录> <输出目录>");return;}string inputPath = args[0];string outputPath = args[1];try{var converter = new TeradataToSynapseConverter();converter.Convert(inputPath, outputPath);Console.WriteLine("转换完成！");}catch (Exception ex){Console.WriteLine($"错误: {ex.Message}");}}}
}

第二步：创建主转换器类

// TeradataToSynapseConverter.cs
using System;
using System.Collections.Generic;
using System.IO;
using System.Text;
using System.Text.RegularExpressions;namespace TeradataToSynapseConverter
{public class TeradataToSynapseConverter{private readonly DataTypeMapper _dataTypeMapper;private readonly SyntaxConverter _syntaxConverter;private readonly CursorConverter _cursorConverter;public TeradataToSynapseConverter(){_dataTypeMapper = new DataTypeMapper();_syntaxConverter = new SyntaxConverter();_cursorConverter = new CursorConverter();}public void Convert(string inputPath, string outputPath){if (File.Exists(inputPath)){ConvertFile(inputPath, outputPath);}else if (Directory.Exists(inputPath)){ConvertDirectory(inputPath, outputPath);}else{throw new FileNotFoundException($"输入路径不存在: {inputPath}");}}private void ConvertDirectory(string inputDir, string outputDir){Directory.CreateDirectory(outputDir);foreach (string file in Directory.GetFiles(inputDir, "*.sql")){ConvertFile(file, Path.Combine(outputDir, Path.GetFileName(file)));}foreach (string subDir in Directory.GetDirectories(inputDir)){string dirName = Path.GetFileName(subDir);ConvertDirectory(subDir, Path.Combine(outputDir, dirName));}}private void ConvertFile(string inputFile, string outputFile){Console.WriteLine($"转换文件: {inputFile}");string teradataCode = File.ReadAllText(inputFile);string synapseCode = ConvertStoredProcedure(teradataCode);File.WriteAllText(outputFile, synapseCode, Encoding.UTF8);}public string ConvertStoredProcedure(string teradataCode){var conversionSteps = new List<Func<string, string>>{PreProcessCode,ConvertProcedureHeader,ConvertVariableDeclarations,ConvertDataTypes,ConvertCursors,ConvertControlStructures,ConvertDMLStatements,ConvertExceptionHandling,ConvertDynamicSQL,ConvertFunctionCalls,PostProcessCode};string synapseCode = teradataCode;foreach (var step in conversionSteps){synapseCode = step(synapseCode);}return synapseCode;}private string PreProcessCode(string code){// 标准化代码格式code = Regex.Replace(code, @"\r\n|\n\r|\n", "\r\n");code = Regex.Replace(code, @"\t", "    ");return code;}private string ConvertProcedureHeader(string code){// 转换存储过程头部声明code = Regex.Replace(code, @"CREATE\s+PROCEDURE\s+(\w+)\s*\(([^)]*)\)","CREATE PROCEDURE $1 (@$2) AS BEGIN");code = Regex.Replace(code,@"REPLACE\s+PROCEDURE\s+(\w+)","CREATE OR ALTER PROCEDURE $1");return code;}private string ConvertVariableDeclarations(string code){// 转换变量声明：DECLARE variable_name data_type; -> DECLARE @variable_name data_type;code = Regex.Replace(code,@"DECLARE\s+(\w+)\s+([^;]+);","DECLARE @$1 $2;");return code;}private string ConvertDataTypes(string code){return _dataTypeMapper.ConvertDataTypes(code);}private string ConvertCursors(string code){return _cursorConverter.ConvertCursors(code);}private string ConvertControlStructures(string code){return _syntaxConverter.ConvertControlStructures(code);}private string ConvertDMLStatements(string code){return _syntaxConverter.ConvertDMLStatements(code);}private string ConvertExceptionHandling(string code){return _syntaxConverter.ConvertExceptionHandling(code);}private string ConvertDynamicSQL(string code){return _syntaxConverter.ConvertDynamicSQL(code);}private string ConvertFunctionCalls(string code){return _syntaxConverter.ConvertFunctionCalls(code);}private string PostProcessCode(string code){// 清理和格式化最终代码code = Regex.Replace(code, @"END\s*;?\s*$", "END");code = Regex.Replace(code, @"\bEND\s+IF\b", "END");code = Regex.Replace(code, @"\bEND\s+WHILE\b", "END");return code.Trim();}}
}

第三步：数据类型映射器

// DataTypeMapper.cs
using System;
using System.Collections.Generic;
using System.Text.RegularExpressions;namespace TeradataToSynapseConverter
{public class DataTypeMapper{private readonly Dictionary<string, string> _typeMappings;public DataTypeMapper(){_typeMappings = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase){// 数值类型{"BYTEINT", "TINYINT"},{"SMALLINT", "SMALLINT"},{"INTEGER", "INT"},{"INT", "INT"},{"BIGINT", "BIGINT"},{"DECIMAL", "DECIMAL"},{"NUMERIC", "NUMERIC"},{"FLOAT", "FLOAT"},{"REAL", "REAL"},{"DOUBLE PRECISION", "FLOAT"},// 字符串类型{"CHAR", "CHAR"},{"VARCHAR", "VARCHAR"},{"LONG VARCHAR", "VARCHAR(MAX)"},{"VARBYTE", "VARBINARY"},{"LONG VARBYTE", "VARBINARY(MAX)"},// 日期时间类型{"DATE", "DATE"},{"TIME", "TIME"},{"TIMESTAMP", "DATETIME2"},{"TIMESTAMP WITH TIME ZONE", "DATETIMEOFFSET"},// Teradata特有类型映射{"PERIOD", "VARCHAR(50)"}, // 近似映射{"BLOB", "VARBINARY(MAX)"},{"CLOB", "VARCHAR(MAX)"},{"JSON", "NVARCHAR(MAX)"}};}public string ConvertDataTypes(string code){string result = code;foreach (var mapping in _typeMappings){string pattern = $@"\b{mapping.Key}\b";result = Regex.Replace(result, pattern, mapping.Value, RegexOptions.IgnoreCase);}// 处理带精度的数值类型result = Regex.Replace(result, @"DECIMAL\s*\(\s*(\d+)\s*,\s*(\d+)\s*\)", "DECIMAL($1, $2)");result = Regex.Replace(result,@"NUMERIC\s*\(\s*(\d+)\s*,\s*(\d+)\s*\)","NUMERIC($1, $2)");// 处理VARCHAR长度result = Regex.Replace(result,@"VARCHAR\s*\(\s*(\d+)\s*\)","VARCHAR($1)");return result;}public string MapDataType(string teradataType){if (_typeMappings.ContainsKey(teradataType.ToUpper()))return _typeMappings[teradataType.ToUpper()];return "NVARCHAR(MAX)"; // 默认映射}}
}

第四步：游标转换器

// CursorConverter.cs
using System;
using System.Collections.Generic;
using System.Text;
using System.Text.RegularExpressions;namespace TeradataToSynapseConverter
{public class CursorConverter{public string ConvertCursors(string code){var cursorBlocks = FindCursorBlocks(code);string result = code;foreach (var cursorBlock in cursorBlocks){string convertedCursor = ConvertCursorBlock(cursorBlock);result = result.Replace(cursorBlock.OriginalCode, convertedCursor);}return result;}private List<CursorBlock> FindCursorBlocks(string code){var cursorBlocks = new List<CursorBlock>();var cursorPattern = @"DECLARE\s+(\w+)\s+CURSOR\s+FOR\s+([^;]+);(.*?)OPEN\s+\1;(.*?)CLOSE\s+\1;";var matches = Regex.Matches(code, cursorPattern, RegexOptions.Singleline | RegexOptions.IgnoreCase);foreach (Match match in matches){if (match.Groups.Count >= 5){var block = new CursorBlock{CursorName = match.Groups[1].Value,SelectStatement = match.Groups[2].Value,DeclarationSection = match.Groups[3].Value,LoopSection = match.Groups[4].Value,OriginalCode = match.Value};cursorBlocks.Add(block);}}return cursorBlocks;}private string ConvertCursorBlock(CursorBlock cursorBlock){var sb = new StringBuilder();// 将游标转换为基于临时表的WHILE循环sb.AppendLine("-- 转换自游标: " + cursorBlock.CursorName);sb.AppendLine("DECLARE @CurrentRow INT = 1;");sb.AppendLine("DECLARE @TotalRows INT = 0;");sb.AppendLine();sb.AppendLine($"-- 创建临时表存储游标结果");sb.AppendLine($"SELECT IDENTITY(INT, 1, 1) AS RowID, * INTO #TempCursorData FROM ({cursorBlock.SelectStatement}) AS CursorData;");sb.AppendLine();sb.AppendLine($"SELECT @TotalRows = COUNT(*) FROM #TempCursorData;");sb.AppendLine();sb.AppendLine("WHILE @CurrentRow <= @TotalRows");sb.AppendLine("BEGIN");sb.AppendLine("    -- 处理单行数据");// 转换FETCH语句为基于临时表的查询string loopBody = ConvertLoopBody(cursorBlock.LoopSection, cursorBlock.CursorName);sb.AppendLine(loopBody);sb.AppendLine();sb.AppendLine("    SET @CurrentRow = @CurrentRow + 1;");sb.AppendLine("END");sb.AppendLine();sb.AppendLine("DROP TABLE #TempCursorData;");return sb.ToString();}private string ConvertLoopBody(string loopBody, string cursorName){// 转换FETCH语句string pattern = $@"FETCH\s+{cursorName}\s+INTO\s+([^;]+);";var match = Regex.Match(loopBody, pattern, RegexOptions.IgnoreCase);if (match.Success){string variables = match.Groups[1].Value;string[] varList = variables.Split(',');var sb = new StringBuilder();sb.AppendLine("    -- 获取当前行数据");for (int i = 0; i < varList.Length; i++){string varName = varList[i].Trim().TrimStart('@');string columnName = $"Column{i + 1}"; // 简化处理，实际需要解析SELECT列sb.AppendLine($"    SELECT @{varName} = {columnName} FROM #TempCursorData WHERE RowID = @CurrentRow;");}// 替换FETCH语句loopBody = Regex.Replace(loopBody, pattern, sb.ToString(), RegexOptions.IgnoreCase);}return loopBody;}}public class CursorBlock{public string CursorName { get; set; }public string SelectStatement { get; set; }public string DeclarationSection { get; set; }public string LoopSection { get; set; }public string OriginalCode { get; set; }}
}

第五步：语法转换器

// SyntaxConverter.cs
using System.Text.RegularExpressions;namespace TeradataToSynapseConverter
{public class SyntaxConverter{public string ConvertControlStructures(string code){string result = code;// 转换IF/ELSEIF/ELSEresult = Regex.Replace(result, @"IF\s+(.*?)\s+THEN", "IF $1\nBEGIN", RegexOptions.IgnoreCase);result = Regex.Replace(result,@"ELSEIF\s+(.*?)\s+THEN","END\nELSE IF $1\nBEGIN",RegexOptions.IgnoreCase);result = Regex.Replace(result,@"\bELSE\b","END\nELSE\nBEGIN",RegexOptions.IgnoreCase);result = Regex.Replace(result,@"\bEND IF\b","END",RegexOptions.IgnoreCase);// 转换循环result = Regex.Replace(result,@"FOR\s+(\w+)\s+AS\s+.*?DO","WHILE 1 = 1\nBEGIN",RegexOptions.IgnoreCase | RegexOptions.Singleline);result = Regex.Replace(result,@"WHILE\s+(.*?)\s+DO","WHILE $1\nBEGIN",RegexOptions.IgnoreCase);result = Regex.Replace(result,@"\bEND FOR\b","END",RegexOptions.IgnoreCase);result = Regex.Replace(result,@"\bEND WHILE\b","END",RegexOptions.IgnoreCase);return result;}public string ConvertDMLStatements(string code){string result = code;// 转换UPDATE语句的JOIN语法result = Regex.Replace(result,@"UPDATE\s+(\w+)\s+FROM\s+(\w+)\s+SET","UPDATE $1 SET",RegexOptions.IgnoreCase);// 转换DELETE语句result = Regex.Replace(result,@"DELETE\s+(\w+)\s+FROM\s+(\w+)","DELETE $1",RegexOptions.IgnoreCase);return result;}public string ConvertExceptionHandling(string code){string result = code;// 转换异常处理：DECLARE EXIT HANDLER -> TRY/CATCHresult = Regex.Replace(result,@"DECLARE\s+EXIT\s+HANDLER\s+FOR\s+.*?BEGIN","BEGIN TRY\nBEGIN",RegexOptions.IgnoreCase | RegexOptions.Singleline);result = Regex.Replace(result,@"DECLARE\s+CONTINUE\s+HANDLER\s+FOR","-- 注意: 需要手动转换CONTINUE HANDLER为适当的错误处理逻辑",RegexOptions.IgnoreCase);return result;}public string ConvertDynamicSQL(string code){string result = code;// 转换EXECUTE IMMEDIATEresult = Regex.Replace(result,@"EXECUTE\s+IMMEDIATE\s+'([^']+)'","EXEC sp_executesql N'$1'",RegexOptions.IgnoreCase);result = Regex.Replace(result,@"EXECUTE\s+IMMEDIATE\s+(\w+)","EXEC sp_executesql @$1",RegexOptions.IgnoreCase);return result;}public string ConvertFunctionCalls(string code){string result = code;// 常用函数映射var functionMappings = new Dictionary<string, string>{{"TRIM\\((.+?)\\)", "LTRIM(RTRIM($1))"},{"SUBSTR\\(", "SUBSTRING("},{"TO_CHAR\\(", "CONVERT(VARCHAR, "},{"TO_DATE\\(", "CONVERT(DATETIME, "},{"TO_NUMBER\\(", "CONVERT(DECIMAL, "},{"NVL\\(", "ISNULL("},{"COALESCE\\(", "ISNULL("},{"SYSDATE", "GETDATE()"},{"CURRENT_DATE", "GETDATE()"},{"CURRENT_TIMESTAMP", "GETDATE()"}};foreach (var mapping in functionMappings){result = Regex.Replace(result, mapping.Key, mapping.Value, RegexOptions.IgnoreCase);}return result;}}
}

第六步：配置文件和支持类

// ConversionConfig.cs
using System.Collections.Generic;namespace TeradataToSynapseConverter
{public class ConversionConfig{public Dictionary<string, string> DataTypeMappings { get; set; }public Dictionary<string, string> FunctionMappings { get; set; }public bool ConvertCursorsToSetBased { get; set; } = true;public bool UseTemporaryTables { get; set; } = true;public string DefaultSchema { get; set; } = "dbo";public ConversionConfig(){DataTypeMappings = new Dictionary<string, string>();FunctionMappings = new Dictionary<string, string>();}}
}// ConversionResult.cs
using System.Collections.Generic;namespace TeradataToSynapseConverter
{public class ConversionResult{public string OriginalCode { get; set; }public string ConvertedCode { get; set; }public List<ConversionWarning> Warnings { get; set; }public List<ConversionError> Errors { get; set; }public bool Success => Errors.Count == 0;public ConversionResult(){Warnings = new List<ConversionWarning>();Errors = new List<ConversionError>();}}public class ConversionWarning{public int LineNumber { get; set; }public string WarningCode { get; set; }public string Message { get; set; }public string Suggestion { get; set; }}public class ConversionError{public int LineNumber { get; set; }public string ErrorCode { get; set; }public string Message { get; set; }public string OriginalCode { get; set; }}
}

第七步：项目文件

<!-- TeradataToSynapseConverter.csproj -->
<Project Sdk="Microsoft.NET.Sdk"><PropertyGroup><OutputType>Exe</OutputType><TargetFramework>net6.0</TargetFramework><ImplicitUsings>enable</ImplicitUsings><Nullable>enable</Nullable><AssemblyTitle>Teradata to Azure Synapse Converter</AssemblyTitle><AssemblyDescription>Convert Teradata stored procedures to Azure Synapse Dedicated SQL Pool</AssemblyDescription><Version>1.0.0</Version></PropertyGroup><ItemGroup><PackageReference Include="System.Text.RegularExpressions" Version="4.3.1" /></ItemGroup></Project>

使用示例

创建测试文件并运行：

// 示例使用
class ExampleUsage
{static void Example(){var converter = new TeradataToSynapseConverter();// 转换单个文件string teradataCode = @"REPLACE PROCEDURE GetCustomerData()BEGINDECLARE customer_count INTEGER;DECLARE customer_name VARCHAR(100);SELECT COUNT(*) INTO customer_count FROM customers;IF customer_count > 0 THENSELECT name INTO customer_name FROM customers WHERE id = 1;END IF;SELECT customer_name;END;";string synapseCode = converter.ConvertStoredProcedure(teradataCode);Console.WriteLine(synapseCode);}
}