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

weixin_307779132025-10-30 16:03

第一步：创建项目结构和基础类

csharp 复制代码 
// 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

csharp 复制代码 
// 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

csharp 复制代码 
// 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

csharp 复制代码 
// 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

csharp 复制代码 
// SyntaxConverter.cs
using System.Text.RegularExpressions;

namespace TeradataToSynapseConverter
{
    public class SyntaxConverter
    {
        public string ConvertControlStructures(string code)
        {
            string result = code;
            
            // 转换IF/ELSEIF/ELSE
            result = 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/CATCH
            result = 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 IMMEDIATE
            result = 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

csharp 复制代码 
// 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

xml 复制代码 
<!-- 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：

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